FI options for Z4M: VT2-500 with water injection, other kits?

[ZStig]

he's "getting high"

anyway, yeah, keep us updated on your quest for torque. I'm guessing its something I'll be looking for myself. I should be placing my vt2-500 order next week (fingers crossed)

[Tiago]

Originally Posted by Beedub

just keep an eye on those hose clamps..... i will also be upgrading to the okada coils, mega expensive but surely worth while, still ill burn out my stock coils first.. :-)

As you know, better clamps is on the way. About okada, i have it as well with CP pistons, Arrow rods, ARP crank studs, crank and rod anti-friction coated bearings and 12.000rpm valve springs. Pistons and rods is half the weight of oem

Long short story, BMW replaced the engine and after a year a middle crank bolt broke. As we know the engines that BMW put is rebuilt and it is obvious that the failure it is due extreme torque on the bolt. But they claim that when the engine was replaced the car was already out of warranty and that the engine was replaced under "cortesy policy" and therefore there isn't any warranty in this cases. Put it in the justice and the car was in BMW facilities for 2,5 years. I got tired of all this and picked up the car and rebuilt the engine in a independent shop. This was 2 years before and the process is still in justice...

[Beedub]

tiago.... any review on the okada coils?? they are pretty expensive ......

[iPhoneEngineer]

Well, I got the baseline dyno today, though I'm disappointed with it--max of 262RWHP . Given that I have the ESS N/A tune and the RPi intake scoop (though it doesn't do much while still, it removes an intake restriction), I was hoping to break at least 280RWHP that many stock Z4MCs do...

Questions for why this could be:
1) My chance on the dyno was squeezed in between a couple others, because I didn't know about the dyno meet that Alekshop was organizing until I asked where he'd recommend I get a baseline run. So, we didn't take off the coil pack cover and weren't able to get an RPM signal (is there really no way to do this without taking off the cover?). Does this make the dyno prone to mis-read horsepower in addition to not showing torque?

2) I have 265/40/18s on the rear instead of the stock 255/40/18s, so they have a somewhat larger circumference. I assume this has some impact.

Any ideas?

[rabbit69]

wow i missed alot. so yes, meth is a MUST the car suffered pretty hard from heatsoak on the dyno, 1/4mile and lapping days, i highly recommend you doing it. and as for the vt2-550 upgrade, im probably going to wait for the vt3 kit and do the upgrade one shot

[Beedub]

Originally Posted by rabbit69

wow i missed alot. so yes, meth is a MUST the car suffered pretty hard from heatsoak on the dyno, 1/4mile and lapping days, i highly recommend you doing it. and as for the vt2-550 upgrade, im probably going to wait for the vt3 kit and do the upgrade one shot

hey bro, glad to have another vt2 owner here putting in his 2 cents......

my climate isnt showing my a significant heatsoak issue as yet..... the vt1 did however really suffer this issue but was still a really great entry kit...

their is no doubt meth/water makes a large difference and i may have to start looking to this BUT...... its more weight i dont want to be adding really......

[Beedub]

Originally Posted by iPhoneEngineer

Well, I got the baseline dyno today, though I'm disappointed with it--max of 262RWHP . Given that I have the ESS N/A tune and the RPi intake scoop (though it doesn't do much while still, it removes an intake restriction), I was hoping to break at least 280RWHP that many stock Z4MCs do...

Questions for why this could be:
1) My chance on the dyno was squeezed in between a couple others, because I didn't know about the dyno meet that Alekshop was organizing until I asked where he'd recommend I get a baseline run. So, we didn't take off the coil pack cover and weren't able to get an RPM signal (is there really no way to do this without taking off the cover?). Does this make the dyno prone to mis-read horsepower in addition to not showing torque?

2) I have 265/40/18s on the rear instead of the stock 255/40/18s, so they have a somewhat larger circumference. I assume this has some impact.

Any ideas?

your tyres are definatly contributing here.... but no doubt the number is low..... with boost you'll be making a solid 420rwhp with the 7psi pulley so dont worry :-) you may be luck *wink wink ess* and get an 8psi pulley that'll net you a solid 440-450rwhp.....

try again with your baslline maybe... either way please take video of your dyno session with the vt2 kit.

[iPhoneEngineer]

Most definitely will have a video of the VT2-500 dynos...I have 1080p videos of both of these runs, and though the numbers came back low, I felt the car seemed quite ferocious

If the baseline figures are at least 20, if not 30+RWHP low, why wouldn't they still be lower than the standard expectation from the VT2-500? Perhaps I just have a dud motor... I've ridden with a 60k mile and 100k mile S54 however, and mine sounds like a finely running sewing machine in comparison (35k miles).

I'm hesitant to drop another $70 on a second baseline dyno, but I suppose a re-run with proper RPM tap would be the only way to answer the question. Maybe I should fill 'er up with 100 octane and let the DME retrain to see what the motor is really capable of with optimal fuel

[Beedub]

Originally Posted by iPhoneEngineer

Most definitely will have a video of the VT2-500 dynos...I have 1080p videos of both of these runs, and though the numbers came back low, I felt the car seemed quite ferocious

If the baseline figures are at least 20, if not 30+RWHP low, why wouldn't they still be lower than the standard expectation from the VT2-500? Perhaps I just have a dud motor... I've ridden with a 60k mile and 100k mile S54 however, and mine sounds like a finely running sewing machine in comparison (35k miles).

I'm hesitant to drop another $70 on a second baseline dyno, but I suppose a re-run with proper RPM tap would be the only way to answer the question. Maybe I should fill 'er up with 100 octane and let the DME retrain to see what the motor is really capable of with optimal fuel

Dont waste the money.... you'll soon be supercharged

[iPhoneEngineer]

Oh, I forgot to mention: I also purchased some Active Autowerke Gen IV headers from Z4Murder, who's endeavoring to test the research exhaust system

I was really hoping to hear and feel the car with just the headers before the VT2-500, but since they should be delivered around the same time, I doubt I can exercise the restraint necessary to avoid installing the supercharger immediately!

[Tiago]

Originally Posted by iPhoneEngineer

Well, I got the baseline dyno today, though I'm disappointed with it--max of 262RWHP . Given that I have the ESS N/A tune and the RPi intake scoop (though it doesn't do much while still, it removes an intake restriction), I was hoping to break at least 280RWHP that many stock Z4MCs do...

Your AFR's is pretty rich on top. The lack of rpm doesn't help much to read the graph. What rpm did on the dyno, 8000rpm or limited 6500rpm (like E46 M3 SMG)?
In your case, make a leak-down test to the engine. If it has good values and no engine light on, don't waste too much time thinking about it because VT2-500 will fix it with the new ECU tune.

Originally Posted by rabbit69

wow i missed alot. so yes, meth is a MUST the car suffered pretty hard from heatsoak on the dyno, 1/4mile and lapping days, i highly recommend you doing it. and as for the vt2-550 upgrade, im probably going to wait for the vt3 kit and do the upgrade one shot

I think that the VT3 kit use the VT2-550 parts with a smaller pulley (for 18psi) and lower CR pistons. Meth and VT2-550 should be good for 500whp and the VT3 has 560whp. Do you think that the cost to install the lower CR pistons worth the extra 60whp, when we already have traction issues with the VT2-500? Not to mention that it will also loose the bolt-on feature...

IMHO, if the plan is the VT3 then HPF is a better route...

[ZStig]

500whp on an optimized VT2 kit would probably the most I'd want in this chassis + you can improve performance by losing weight, especially at the flywheel and with a CF driveshaft. But who knows, power is addictive

[Beedub]

Originally Posted by Roffle Waffle

500whp on an optimized VT2 kit would probably the most I'd want in this chassis + you can improve performance by losing weight, especially at the flywheel and with a CF driveshaft. But who knows, power is addictive

absolutly agree.... 500 rwhp will be PERFECT in this car and MORE than enough..... bear in mind a ferrari 458 italia is making 450-480rwhp.....

imho, vt2-500 with weightloss will make this car a complete weapon.

[ZStig]

whats annoying is how easy to get e46m3 down to 2700lbs, and so hard for a z4m.

[VinnieAces]

dont feel so bad, i got 274.2 from my baseline, mine was also a WINPEP Dynojet

pics of someones graphs with over 280?

[Beedub]

Originally Posted by Roffle Waffle

whats annoying is how easy to get e46m3 down to 2700lbs, and so hard for a z4m.

Dropping the stock seats is probably the biggest single weight loss.....Sad thing is i love them......

[iPhoneEngineer]

Originally Posted by VinnieAces

dont feel so bad, i got 274.2 from my baseline, mine was also a WINPEP Dynojet

pics of someones graphs with over 280?

...that's a whole 12whp more than my best run, and I have the ESS N/A tune + RPi scoop!

These two cars were allegedly stock and got 283, and /293/whp...

http://www.dragtimes.com/BMW--Z4-M-C...no-Sheets.html

A leakdown test on a 35k mile motor? Makes me wonder if I should buy a different Z4MC before shelling out for the VT2-500 install labor

[gcochard]

Originally Posted by iPhoneEngineer

...that's a whole 12whp more than my best run, and I have the ESS N/A tune + RPi scoop!

These two cars were allegedly stock and got 283, and /293/whp...

http://www.dragtimes.com/BMW--Z4-M-C...no-Sheets.html

A leakdown test on a 35k mile motor? Makes me wonder if I should buy a different Z4MC before shelling out for the VT2-500 install labor

That 283 run had 0 smoothing factor. That's gonna increase the HP artificially, as will applying a different correction factor.

The 293 run was palantirion, or earl@mymcoupe.com. I am pretty sure that's not a stock graph, as he has a bunch of runs comparing power adders, and looks like stock was 250 or so? Not really sure, the graph doesn't have any "Peak" readout.

You can interpret it as you want, scroll to the bottom of this page and look for mod 52:

http://mymcoupe.com/PowerMods.htm

[iPhoneEngineer]

Great point about the smoothing factor--I didn't notice that, but see exactly what you mean.

Indeed, the graphs here have much lower numbers:
http://www.myz4mcoupe.com/images/Sca...yDynoPlots.JPG

I'd looked at other plots than just the two on dragtimes, though perhaps I was just running across exceptional cars and mine is more average. If you've dyno'd your near-stock Z4M, post your RWHP here!

[johanness]

^^^ That's precisely why dyno #'s themselves are such a complete waste of time. There's WAY too many variables. Unless it's just to satisfy your curiosity, save your $.

[iPhoneEngineer]

Part of the "mystery" solved--Aleks, who organized the dyno event, mentioned:

"All the numbers were low that day and I think weather has something to do with it ... We dynoed VT1-535 and it showed 450whp ... the same car on this exact dyno showed 478 3 weeks ago ..."

It seems odd to me since the temperature and humidity weren't unusual.

[VinnieAces]

just look at dynos being true to themselves,

dyno again only when mods have been added on the same dyno and (to as much as possible) the same conditions, ie gas used etc,

what was your torque rated at tho? mine was 228.7