Supercharger

[GuidoK]

Is that pré or post cooler boost?

[Rated M Roadster]

Originally Posted by GuidoK

Is that pré or post cooler boost?

After the cooler.

[GuidoK]

Then that's a lot of boost

And that is boost over realtime atmospheric pressure? (so 11psi is also really high pressure ratio on high altitude)

And your kit is rated @ 9 psi?
Maybe the sci trim is very well suited at high altitude. I don't think you can read that of a CFM diagram and I don't think it is scaled proportionally with the parameters atmospheric pressure and temperature. (thermodynamics on this level is way to complicated for my mind )

On the other hand I see 29,9 inHG, which equals about 1000hPA (a little bit more), so if that's measured in the same situation it is an indication of the atmospheric pressure and that means that you were'nt on high altitude or that there was a high pressure area (probably the latter because I assume you knew where you were ), but that also means that this kit can put out the same amount of pressure at sea level (given the same ambient temperature). I mean: the amount of inHG you can measure is related to the ambient airpressure I think? (I'm going way off topic here )

[pandusr]

Originally Posted by Rated M Roadster

The test car was EAS's coupe; it started with the non intercooled kit and eventually received the 570 (I think they also have a test car in Europe, but I don't know much about that). The issue with my car being a second test car, is mine is unique in that I'm running at high altitude. My fuel adaptions are much different than most people who will be running the kit (the ECU pulls fuel to compensate for the altitude). At the same time though, during datalogging, I was seeing boost pressures way above what the kit was rated for (due to low ambient temps). I saw this during a 4th gear run at low temps:


gauge1 by M detaR, on Flickr

The AFR graphs I posted a long time ago in my thread reflected these conditions.

I have 3300 miles on my kit now and as my schedule clears up, I'll try to get more data for you guys.

Use the same tool Plx.

The maximum recorded pressure is distorted by the "water hammer" when remove gas.

[GuidoK]

What's a water hammer? You mean that when you close the throttle valve the momentum of the air column (also driven by the sc of course) pushes in on itself?
Wouldn't the opening from the BOV compensate for that or is that system not fast enough to do so?

Interesting remark though

[ZStig]

thats probably what he means. I normally only see it if I overrev the car

[pandusr]

Originally Posted by GuidoK

What's a water hammer? You mean that when you close the throttle valve the momentum of the air column (also driven by the sc of course) pushes in on itself?
Wouldn't the opening from the BOV compensate for that or is that system not fast enough to do so?

Interesting remark though

Sorry for my English.

I meant this. My instrument, with active sports key, marked 14 psi.
Is dangerous for throttle valve.

[pokeybritches]

Vortech recommends a bypass with anything over 6 psi.

[mfanatic325]

Originally Posted by GuidoK

Doesn't VF have a z4m testcar for their kits or something like that?
I have no idea how those companies work and how they develop a kit for a new car but I don't know if I'd like to be a guinea pig with my own car.
On the other hand: you're always a guinea pig to some degree if you go for FI compared to stock
I have one of the most comprehensively tested kits and even that has it's own little quirks from time to time. It's never as reliable and user friendly as stock.

Yeah...and even OEM still has its own quirks/issues

Gotta pay to play I suppose
Things are going to go wrong eventually, especially if these cars are pushed at all. So maintenance/repairs are a given hah

Originally Posted by pokeybritches

Vortech recommends a bypass with anything over 6 psi.

Gonna be running a TIAL BOV. Andrew ordered one as well, but it was too loud for him, so he went back to the BPV included in the kit lol

[GuidoK]

Originally Posted by pandusr

Is dangerous for throttle valve.

Never thought about that. How big are these things? 50mm diameter or so?
Then they get a weight of almost 20kg (regarding 2 bar pressure: vacuum on one side, 14psi over atm on the other side)
But a single throttle valve is much bigger (almost 70mm in my case) so that gets a lot more weight/pressure, almost 40kg

[Rated M Roadster]

Originally Posted by pandusr

The maximum recorded pressure is distorted by the "water hammer" when remove gas.

Not really, boost is measured after the throttle body.

Also, the low vacuum reading (29.9) is due to lift off. The can runs around 7 inHg at idle.

Originally Posted by pandusr

Is dangerous for throttle valve.

Hardly; there's a reason for a BPV or BOV. Without one, the pressure would go back into the SC (damaging the blades) well before doing any damage to the throttle bodies.

[GuidoK]

Originally Posted by Rated M Roadster

Not really, boost is measured after the throttle body.

So you only have a pressure sensor after the throttle valve? Like connected on a vacuum line? (before any vacuum valve obviously)

[Rated M Roadster]

Originally Posted by GuidoK

So you only have a pressure sensor after the throttle valve? Like connected on a vacuum line? (before any vacuum valve obviously)

Yes.

[xyvyx]

I hope I can add some positive results to the VF argument in the near future.. I've got the VF480 kit sitting in boxes @ home now. It will probably be at least a month before I get it installed, though, as I want to put my SS headers/exhaust + euro-cats on first and work out the kinks.

[seank]

Originally Posted by xyvyx

I hope I can add some positive results to the VF argument in the near future.. I've got the VF480 kit sitting in boxes @ home now. It will probably be at least a month before I get it installed, though, as I want to put my SS headers/exhaust + euro-cats on first and work out the kinks.

8 months isn't the NEAR future. I will also be changing headers etc prior.

[johanness]

Originally Posted by seank

8 months isn't the NEAR future. I will also be changing headers etc prior.

8?

Originally Posted by xyvyx

I hope I can add some positive results to the VF argument in the near future.. I've got the VF480 kit sitting in boxes @ home now. It will probably be at least a month before I get it installed, though, as I want to put my SS headers/exhaust + euro-cats on first and work out the kinks.

Sounds similar I guess

[seank]

Originally Posted by johanness

8?



Sounds similar I guess

My bad. I don't know where I got that. Maybe thinking about the time that the kids will be in bed and I will be relaxing on the couch.

[aerobod]

Originally Posted by xyvyx

I hope I can add some positive results to the VF argument in the near future.. I've got the VF480 kit sitting in boxes @ home now. It will probably be at least a month before I get it installed, though, as I want to put my SS headers/exhaust + euro-cats on first and work out the kinks.

As of today, it will still be another couple of weeks until VF has the tune finished, they will only be done tomorrow in prepping another car for the dynomometer tuning. My VF480 kit is anxiously waiting a DME file so that I can do my install.

[seank]

Originally Posted by aerobod

As of today, it will still be another couple of weeks until VF has the tune finished, they will only be done tomorrow in prepping another car for the dynomometer tuning. My VF480 kit is anxiously waiting a DME file so that I can do my install.

They didn't send you a tune with the kit?

[mfanatic325]

Originally Posted by aerobod

As of today, it will still be another couple of weeks until VF has the tune finished, they will only be done tomorrow in prepping another car for the dynomometer tuning. My VF480 kit is anxiously waiting a DME file so that I can do my install.

Originally Posted by seank

They didn't send you a tune with the kit?

I also just heard that they have another test car in for an even newer tune. Dafuq? I like how they don't update me on this crap. I had to find out through Andrew

Anyway, aerobod, do you know if the tune that they're working on is for the 480 kit or the 570 kit? Because I'm also waiting on them to send me my cable/tune

[aerobod]

Originally Posted by mfanatic325

I also just heard that they have another test car in for an even newer tune. Dafuq? I like how they don't update me on this crap. I had to find out through Andrew

Anyway, aerobod, do you know if the tune that they're working on is for the 480 kit or the 570 kit? Because I'm also waiting on them to send me my cable/tune

I'm assured at least the 480, but I understand that they will build the car up, so likely start at 480 and end at 570 with injectors, pulley, BOV and exhaust change. I'm generally not emailing them directly, as I get faster response by emailing my sales guy at Vivid Racing who talks to VF. I have the cable and have sent them my DME output (back before Easter), but still need the 2MB DME load customized for my car.

I need the VF480 tune to work with a stock exhaust (we have automated cameras that activate at 92dB drive-by noise levels, then trigger a costly photo ticket in the mail, but the stock exhaust is exempt). Also my default altitude is 1250m (4000ft) and I use the car at ambient temperatures that vary from -25C (-13F) to +40C (+104F).

[aerobod]

Originally Posted by seank

They didn't send you a tune with the kit?

The kit comes with a cable and HexFlash software that becomes coded to the car VIN. The encrypted ECU / MSS70 DME flash is then downloaded onto a PC via the OBDII port and emailed to VF for a custom build. They have my ECU download, I'm waiting for the custom build to re-load.