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      04-07-2015, 07:14 PM   #1
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*Note* I want this to stay strictly informative.

Perhaps we could gather some performance stats of the cars running forced induction applications as a method to compare kits on a strictly performance basis, and how specific additional modifications can change the performance figures.


It would be great for some of you guys running these kits to post up your mods, and the hp/trq, approximate weight, and any performance numbers ie. 0-60mph, 0-100mph, 60-130mph, 1/4mile etc of your cars


I understand not everybody's first concern is performance. But I would appreciate a collective resource that may help future forced induction owners get an idea of how their car could perform.


I hope everyone is starting to bring their cars out of hibernation as well!
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      04-07-2015, 07:58 PM   #2
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Current best run on a VT2-500 kit, timeslip attached. On Bridgestone RE-11 tires. 3172lbs

12.17@116.4mph
the fastest one on Dragtimes, but I'm sure there are faster ones out there
http://www.dragtimes.com/BMW--Z4-M-R...ag-Racing.html
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      11-30-2015, 01:31 AM   #3
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Reviving this thread. I would also like to see an informative Forced Induction thread. Preferably of the m coupes and roadsters.
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      11-30-2015, 01:06 PM   #4
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I'll measure the pulley diameter of the G-Power kit, but I believe it's almost maxed out. IIRC, the stock S54 crank pulley is 5.1" while the G-Power supercharger pulley is around 6". At 8k engine rpm, with a 1:15 internal step ratio, the supercharger is spinning at 102k rpm. Max rated speed is 100k rpm, which is within the margin of error of my measurements.

http://www.asa-kompressor.com/en/pro...ger-t1/t1-518/

The Vortech has room to grow, but belt slip would be a major issue. To upgrade an ESS kit, you're looking at multiple custom pulleys, injectors, tuning, etc. It's not cheap.

http://www.vortechsuperchargers.com/page.php?id=30148

From a feel standpoint, the G-Power comes on earlier and harder, but the ESS kit has linear power delivery and more top end. When I pop the hood, the ESS kit gets a "cool" from enthusiasts, but the G-Power gets a "WOAH!!"

Maintenance wise, I've had the coolant lines fail (way too early IMHO) on the G-Power kit. The ESS kit has popped a hose off twice in the same spot, on a different fitting each time. Neither crippled the car. Rebuilding a Vortech is cheaper than an ASA supercharger.
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      12-02-2015, 04:23 AM   #5
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ESS VT series all day for me.... heres why....

the VT2 is just perfect perfect for the car, still requires REVs from the engine , power band exactly the same just ,moved up the graph. No big slogs of Tq then breathless up top , the ess kit literally feels like an engine swap to a bigger engine. The car does NOT FEEL Fi which is perfect for this car, throttle response , drivability , AFRs, all on the nail, i can place this car and slide it with ease just like i could with stock, i just need a-little more space to ride it out!

its best kit for this platform imo as it uses A/A cooling, upgrade paths are Easy, if expensive however. Ive used my car so so so many times in ALL day 30 Deg C track sessions and it just keeps going, consistent power and been nothing but reliable. Can we say that about the VF / G-power setups ?? Damn i don't think I've seen one owner use them in that way and post about it anyway.

Eas will hands down tell you the ess kits are the way to go and install all 3. The g-power setup has no movement what so ever the blower is maxed out, once your in your getting no more power unless you go it alone, far more expensive than these belt slip issues i hear about with the ess kits, mines never slipped the belt, and with other changes to the other pulley will easily be able to go smaller, the belt wrap is good and the belt positioning is very good.

i haven't just talked about my kit being fantastic, I've proved its worth, i strap on the numbers to the car and ACTUALLY compete in regional sprint championships with this car, I came top of my class for 3/4 of the season and beat 90% of the supercar class too, GT3s, vipers, GTs, ferrari .... Any VFs , G-power cars doing this?? or just their owners doing free-way pulls for 10 seconds?? Both of the other cars don't have oil cooler upgrades as part of the kits and i can assure you they'll be overheating the oil way quicker than you can imagine. That IS something that needs doing i don't care what a soul tells you on here! if you use it properly it needs changing, freeway pulls and road driving its probably ok...

then how its all integrated in the engine bay, the ess kit looks like factory, people ask me what bits not stock , no over the top loud looking in your face parts, just subtle high quality pieces, which for me and many on a car like this is very important. Ive had my car from 900 miles old and this kit has literally been plug and play bar maintenance which really needs to step up.

VF - don't even get me started.... Good hardware but thats about all i can say from those people, they wouldn't even be in the running for me.

over the years, I've tweaked and changed pieces, added better quality hosing, better breathing, went a stage up on the s/c and still..... just perfect.

Proof is in the pudding and this car has more than proved it mettle to me and the naysayers at the track, i turn up with my nankang semi slicks and my bolt on s/c kit (which has the rich boys s******ing already) and put numbers down that create shock, the car has gotten quite a reputation now and is seen as THE competition. quite simply i love it. No more power needed the rest of the car needs tweaks to get it all setup right but once it is... what a package we have. Even with the setrab oil unit these oil is easy to heat up so the stock oil cooled cars must be a joke when used properly.

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      12-02-2015, 06:43 AM   #6
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I have no experience with either VF or Gpower but i have an ESS VT2-500 kit like the one Byron has and i would easily tell you that ESS is the way to go for the various reasons that Byron stated.

I had some troubles with my kit at first but ESS was very responsive in helping me solve those out

Also air 2 air cooling and oil cooling should be a major keypoint for you in your choice
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      12-02-2015, 02:06 PM   #7
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Shame the evolve setup never came to fruition as that had the hall marks of being a top dog.

But whatever i say about ESS, they are cocky bastards, but the service i get, the answers, the kit performance, the kits proven reliability.... i can't refute the evidence. For the z4m platform is the best choice hands down.
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      12-02-2015, 03:39 PM   #8
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I'm the only active member on any Z4 forum that has a G-Power Z4M, so I might as well play devil's advocate. The only other guy I know of that has one hasn't posted here in quite some time. And I own a VT2-500 Z4M, so I can compare them daily. I don't need to speculate about what it's like to drive either one. I drive them hard on occasion. I don't compete with them, because I wouldn't drive either without a solid BBK on the track for an extended session. FWIW I've overheated the OEM brakes on a completely stock car, and I'm not new to pushing a car to its limits. However, a good BBK is expensive, and it will take some time before I can put one on the G-Power car.

The main reason there aren't more G-Power kits out there is because G-Power is particular about which shops can install their kit. I know of only one dealer in the U.S., and that's Precision Sport Industries in Florida. I hadn't heard EAS is an authorized dealer. If there are others, they don't advertise it well. Proper install is extremely important, and I've had no major issues with mine. I dropped it off at the shop and picked it up when it was done. Painless. Not everyone can do this, which is part of why the G-Power kit isn't as popular.

The other reason it's not as popular is cost. Most people pick the kit with the best (advertised) peak horsepower per dollar ratio, and then eliminate kits from the list that others complain about. There's so much more to owning a kit than that. Every piece of the G-Power kit is a work of art. Most non-enthusiasts can't tell which parts of the ESS kit are stock, and while that can be a good thing sometimes, everyone is blown away when they see the G-Power manifold and compressor. It looks just as good as it performs. (Side note: while picking up parts from the dealership two days ago, I noticed a couple of enthusiasts talking about the car... when they noticed the aftermarket exhaust and started asking what mods the car had, I popped the hood; both pulled out their cameras, shocked... it took me 20 min to escape the crowd that formed). It's also got a more expensive supercharger, which is lighter and generates boost pressure sooner. The end result is you don't need to rev it as high to get good power, and you will smoke other cars claiming more peak power. ESS used to make a kit that used the ASA compressor, but I've heard G-Power bought ASA (or maybe the other way around), and now G-Power is the only way to get an ASA compressor. VF and ESS use Vortech, which is a good top end unit but doesn't make nearly as much midrange power. The point is, if Vortech is better, why did ESS first choose ASA?

On the dyno, my ESS kit had more heat soak issues than the G-Power car, and the G-Power manifold may not have even had coolant in it... I found cracks in the lines afterwards during a routine inspection. Another difference is my ESS car had 80k less miles at the time of the dynos, and it's about time for my G-Power car to get a Vanos rebuild. So, there may be power left on the table. I'll find out this winter.

Saying air to water cooling isn't good for the track is old thinking. I've driven the M3/M4 on the track ALL DAY in July heat and not had an issue, and they use a similar setup to the G-Power and VF kits. The difference is in the size of the radiator and rate at which heat can be exchanged. VF runs more boost which requires more cooling, so it outpaced its heat dissipation while on EAS's track car.

Not having room to grow is kind of a moot point, since no one has tried to get significantly more power out of either kit. Frankly, neither kit really needs it, and more power requires more tire, brakes, and cooling while stressing the engine to a greater degree. 500+ hp in this chassis is enough for most people. The biggest power difference is in the delivery. With the G-Power kit, it's like they decided what the right amount of power was based on feel, and that's where they set the power level. I don't know how to explain it other than it's the right amount for the car.

I like both kits. The ESS is easier to drive because it doesn't make as much power until it gets into the high rpm. That's not to say the G-Power car is difficult to drive, but it requires respect. If you treat the throttle like a discrete on/off switch, you will overwhelm the rear tires and scare the hell out of your passengers.

The VF kit with a proper tune (like TTFS) will make the best drag car and is good for dyno bragging rights. The ESS kit has been proven on the track. The G-Power kit is like an instant spool turbo with the most beautiful attention to detail.

I have put 19k trouble-free miles on my G-Power Z4M. My ESS Z4M has an unknown number of miles on the kit, but the 8k miles I've put on it have only required reasonable maintenance. OP, don't let anyone fool you into thinking one kit is the greatest ever, and all others suck. Having owned both, I can say each has its draw. I'm starting to lean to G-Power if I was forced to choose only one, but it would be a hard decision.
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      12-02-2015, 05:05 PM   #9
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Quote:
Originally Posted by pokeybritches View Post
The main reason there aren't more G-Power kits out there is because G-Power is particular about which shops can install their kit.
In europe you also don't see this kit often. Is it even still sold/available?
I saw one guy on the german zroadster forum who had a z4m sk1 install

The rs sporty drive (a smaller kit without intercooler for the m54, up to 306bhp) sold really well though. Lots around here in europe. The compressor on that has a bit of a reputation for rebuilds (maybe due to bad oil lines or dodgy installs)
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      12-03-2015, 02:03 AM   #10
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I also agree with Pokey in respect to the right amount of power to the chassis and if you're ok with 450-500 HP then you should definitely choose the G-power because the ASA is in its most efficient range and properly sized to the boost level.

I chose ESS because it has a proven reliability by a ton of people as well as the supercharger is cheap to rebuild and I can raise the boost in the future.
Knowing what i know now about the G power kit's reliability and other people's feedback, i would choose G-power as i am lighting up tyres with my ESS already and i don't think this chassis is meant to have more than 500hp

Either case, install good suspension and brakes before you raise the power, the fun from those is higher than the fun from more power
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      12-03-2015, 10:06 AM   #11
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The ESS tune is spot on, as long as you don't modify beyond OEM U.S. or Euro headers. ESS will not tune for stepped headers, so I had to seek an alternate dyno tuning source, which was expensive. ESS said stepped headers will not work on the Z4M (they do, as both my cars have stepped headers). However, if you intend to run OEM headers, ESS has their tune down perfectly.

Overall I'm happy with my ESS car. It feels like it wants to pull to 9k rpm. Power keeps climbing until you slam into the rev limiter.

The VF bracket is better designed for more boost, with an extra pulley to increase belt wrap on the supercharger pulley. I've had no slippage running standard boost levels on the ESS kit however... the bracket is only an issue if you want to run more boost. If you run the ESS kit within spec, you shouldn't have issues with slip.
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      12-03-2015, 10:28 AM   #12
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Quote:
Originally Posted by GuidoK View Post
In europe you also don't see this kit often. Is it even still sold/available?
I saw one guy on the german zroadster forum who had a z4m sk1 install

The rs sporty drive (a smaller kit without intercooler for the m54, up to 306bhp) sold really well though. Lots around here in europe. The compressor on that has a bit of a reputation for rebuilds (maybe due to bad oil lines or dodgy installs)
AFAIK it's still available. I saw a youtube video of a black Z4M with a G-Power kit, and a white Z4M on this forum that has it. Otherwise, I haven't seen any others. It would be nice to hear their thoughts.

Technik used to offer an M54 supercharger setup with an ASA compressor and air-to-air intercooler. I hadn't heard of them having those issues, but Technik has been defunct for a few years now.
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      12-03-2015, 03:31 PM   #13
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Attached are dynos of the older ESS CFR 550 (ASA supercharger) and the newer ESS VT2-550 (Vortech supercharger). The CFR ran a claimed 7.5 psi, while the VT2-550 runs a claimed 9 psi.

The pros of the Vortech are that it has more power potential and is much cheaper to purchase and service. The ASA is:

+50 whp @ 5.5k rpm
+60 whp @ 6k rpm
+70 whp @ 6.5k rpm
+45 whp @ 7k rpm where max power is reached and held until 8k rpm

I raced my cars side by side when they were within 1 whp peak power (G-Power car has SS headers and HJS cats, while the ESS had the stock exhaust). You can PM me for a link to the video. The G-Power car ran away due to +50 whp in the midrange. The race wasn't fair considering the exhaust mods, but it taught me a lesson in torque. "Torque wins races." A 50 whp advantage in the low end might overcome a 100 whp deficit in the top end. This is because the power produced is dynamic and varies with engine speed. As the G-Power car pulled ahead, the rpm climbed at a greater rate. At one point it may have been at 5500 rpm while the ESS car was still at 5000 rpm, so the power disparity was even greater at that moment in time. In some ways it's like how corner exit speed multiplies on the next straight.

I've since made some serious upgrades to the ESS Z4M, including a TTFS dyno tune, CPI stepped headers, and DKF s-pipe. The next race will be a lot closer. The exhaust mods added a lot of low end, and I think the ESS car now has more 7-8k rpm top end. Repairing the coolant leak has helped the G-Power's top end too. It will be interesting to see which is fastest
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      12-03-2015, 10:45 PM   #14
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The cf2 at 7.5 psi is making 368 peak wheel torque!?! Wow. What really is amazing though is this is carried most of the way through the revs too, as you said.

So the g power car is similar to this older ess kit compressor wise, and runs more boost?
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      12-04-2015, 08:52 AM   #15
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Quote:
Originally Posted by Calichase
The cf2 at 7.5 psi is making 368 peak wheel torque!?! Wow. What really is amazing though is this is carried most of the way through the revs too, as you said.

So the g power car is similar to this older ess kit compressor wise, and runs more boost?
The G-Power runs a little less boost. I have seen 7-8 psi on my AEM boost gauge in the winter, but it's usually right around 6 psi. The power delivery is similar though.
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      12-09-2015, 09:34 AM   #16
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Quote:
Originally Posted by pokeybritches View Post
The ESS tune is spot on, as long as you don't modify beyond OEM U.S. or Euro headers. ESS will not tune for stepped headers, so I had to seek an alternate dyno tuning source, which was expensive. ESS said stepped headers will not work on the Z4M (they do, as both my cars have stepped headers).
Interesting, I was originally planning on a vt2 with ss v2 stepped, and catless. Are there any numbers for OEM US vs euro headers? and does the ESS account for catless?
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      12-09-2015, 12:00 PM   #17
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Quote:
Originally Posted by Cortes2141 View Post
Interesting, I was originally planning on a vt2 with ss v2 stepped, and catless. Are there any numbers for OEM US vs euro headers? and does the ESS account for catless?
Cortes, FWIW, I'm running ESS with 100 cell cats, active auto headers. No issues and no CEL. I can't say for certain on catless though.

Quote:
Originally Posted by ZStig View Post
Current best run on a VT2-500 kit, timeslip attached. On Bridgestone RE-11 tires. 3172lbs

12.17@116.4mph
the fastest one on Dragtimes, but I'm sure there are faster ones out there
http://www.dragtimes.com/BMW--Z4-M-R...ag-Racing.html
How do you like the Bridgestone tires?
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      12-19-2015, 01:30 AM   #18
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I was thinking about this ESS - Gpower comparison again knowing that sometimes i do like to have a little bit more torque in the midrange

However i think that ESS provides a very nice solution due to the following:
* less stress on the engine anywhere below 6K
* great power when downshifting and using the right gear when you need it (drag, drift, competition)
* Vortech is easily rebuildable and more reliable (self contained oil)
* Upgradable power

This makes the ESS kit look pretty nice knowing that when doing some exhaust upgrades, half of your torque issues are somewhat resolved.
Apart from the fact that people who rely on mid range torque are just lazy not to downshift and get real power from the vortech.
Downshifting in an ESS car gives you this feeling of satanism that pokey was refers exist with the Gpower
The gears are close ratio and from 2nd gear on you can spend all your time above 5.5K-6K



from 3rd and on the car will drop to 5.8K then 6.4K then 6.6K


These are my dyno numbers after the euro headers and decat Spipe.
[/URL]

You need to look at the MAX eng power and torque.
The torque reading is 374 ft.lbs knowing that the dyno reads the torque value high, you can safely assume that it's definitely 340 ft.lbs
As for the horsepower, the dyno was calibrated with some bench testing to provide accurate value and it's putting out 502hp exactly like what ESS provides with the VT2-500 kit.


I'd love to see the dyno run of the ESS kit after your exhaust mods as my car felt alot more powerful after the euro headers and decat.
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      12-19-2015, 03:16 AM   #19
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i have the 100 cell high flow race cats from DKF with large bore section 1. id love to see if this made me alittle power :-) it definitely released some additional noise.

interesting on a side note BESIDES power... after doing a minor strip down to do my valve tolerances that were out of spec, the cleanness of the motor, and the lovely uniform wear on the spark plugs really lend well to how well the car is running ( tune perfection etc). My car is beat up properly and to be able to see the internals in that condition was really nice...

it was like new, however i does help with the cars low miles and high rate of oil changes.. but it was literally like a mirror in their! Still the kit of choice for me, it suits the car PERFECTLY, the best accolade i can say is its literally like a big engine swap, power right to the top of the curve and revs out like the stock s54, just with a little help!



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      01-13-2016, 07:52 PM   #20
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this thread needs more performance measurements beyond dynos, as per the original post
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      01-13-2016, 08:17 PM   #21
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Quote:
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this thread needs more performance measurements beyond dynos, as per the original post
Agreed!
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