What the hell is wrong with my car?

B6/7 S4/RS4
#21

Saki’s right about the correlation to trap speed; you are losing some good power. The rich symptoms under load sound like a small boost leak. Losing any of that metered air will make for a rich condition. What is the baseline psi for that kit anyway? A leak at lower pressures is generally easier to find.

edit: what I meant by the last statement was that if you have a leak at lower boost pressures it is generally easier to find than leaks only found at higher pressures. Pressure testers are cheap and effective.

#22

Great…sigh…

Here’s the timeslip.

http://www.gauntlet.net/audi/13-7-quarter-mile.jpg

#23

Ok, just spoke to JHM’s tuner for the last hour and he fully confirmed it was simply heat soak.
Looks like I’ll need to go back on a less busy evening and bring some ice with me.

Phew.

#24

glad you got some confirmation. That doesn’t require $$ :slight_smile:

#25

Staging lane heat and heat soak will kill the potential of a good run. Not to mention the DA Close to 2500. The Issue that your looking at is the performance of this and any real kit is going to be on the road where your getting REAL air across the car.

Here is another great example. A strong running 11second car. Is the RS4 APR car I worked on. We went through 30lbs of Ice to keep the temps in check. In order to keep the heat at bay.

http://audirevolution.net/addons/albums/images/301210427.jpg

You don’t need this ice if your driving the car as there is air flowing across the car keeping it cool. If you’re going to park the car and want to dyno or track the car you’re going to need to make sure to keep the heat in check.

There is a small list of things that go with that. You can attribute the lower trap times from the heat for sure. As the tune in the car will limit the power when oil and coolant temps exceed a limit.

More so then that I believe its the lower shifting RPM. Axel spoke on shifting at the 6000rpm range rather then 7200. The car just never got a chance to get its legs.

Due to the limited power that these motors can handle if your looking to get a solid time performance wise from the Supercharger your going to need to get out of the hole strong and let the RPM ride out the rest of the way. To keep the motors alive the Tune for the supercharged cars is quite tame and pulls power each gear. closeing the Throttle by over 45% after 5800. The car will still continue to make more and more power. Even with the closed throttle, the 11sec passes of jay and D are on tunes that limit the power more each gear and each RPM. So you need every bit of RPM and a great start.

#26

Count, what do you think about using water/meth injection to lower the intake temps down during runs? Of course the ice would probably still be the best idea to cool down the engine after driving to the track but would the water/meth injection be worth using at all for during runs?

I ask because Dan at RAI kept pimping their water/meth injection kits at the last local meet. He has a B6 S4 with a MP90 that they built for a customer and then he later purchased from them. He said the meth helped lower the intake temps down a bunch on that car. Now I know it is not the same blower setup but I just wanted to get your thoughts on this for the JHM blower. There is a longer back story about why they went with MP90 instead of the TVS but I want to stay on point.

[quote=“CountVohn,post:25,topic:3646”]
I will keep this in mind for when I take my car back to the strip. Thank you!

#27

That car is a tip right Jimmy? It ran 12.59 @ 112

Audirevolution.net/quartermile

#28

I have never actually seen the car in person but it appears that car is the only one listed with a RAI M90 S/C.

#29

I bet water meth would help, I like the idea of it as a helper not something the car relies on the make power (race gas tune on pump+w/m for instance)