[s-cars] Re: Wastegate spring tightening

[Elijahallen92 at aol.com]

Mihnea,
 I totally agree with everything you said but the wife's RS2'd car is  
running 28psi and dropping off to 22 by redline without doing anything to the  
spring. So this is just the SW being to aggressive? BTW when are you coming back  
over, my ES2 should be ready soon and a new tubular header going on at the same 
 time as a beter MAF setup so I will need some tuning to say the least.  
Thanks,

Elijah
 
In a message dated 10/15/2004 8:17:06 AM Eastern Standard Time,  
mihnea.cotet at easynet.be writes:

Guys,


Just a little info here: 28 psi all the way to 6k RPM  and 25 psi up to the 
redline are both "suicidal" boost levels for an RS2  turbo.

Apart from being bad on the turbo itself (overspinning at high  RPMs), it's 
also totally unefficient and turns the turbo into a large heat  pump. 
Efficiency must be close to 40% at these sort of boost levels and  such high 
RPMs. Which means that your cars will be making lots of power at  relatively 
low RPMs (4k to 4.5k) and then the power will simply tail off,  because of 
the increase in heat on the intake side, and also because of  the stupidly 
high backpressure levels in the exhaust, which in turn makes  the engines 
ping a lot easier, so the ECUs will dial the timing advance  back to keep 
the engines from knocking.

Together with my german  tuner colleagues, we have a phrase to sum all this 
up: manchmal ist  weniger mehr, or in english: sometimes less is more.

Just a  thought...

HTH,

Mihnea