it held peak boost for most of the powerband. i would initially spike to about 21, and then hold 19 from about 4k on to redline.

to see that boost level, it took lots of readjusting of the wga, as well as the supporting mods. the exhaust system, hard pipes and tb all helped in seeing higher boost levels. but really, it's about the tune. the 4mm setting that mopar recommends is really just a starting point and should not be taken as gospel. my car ran like crap on the 4mm, i had it at about 5mm for it to run properly.

 

were you using any kind of boost controler or just the dial a boost?

 

just the dial-a-boost. you loose it if you use a mbc.

 

thanks psi i might have to try adusting the wga to 5mm i have it at 4mm and spikes to about 17.5 psi and settles to about 15 or 16 psi.

 

ok get this i put my old wastegate on there and it is working lower boost but its working around 14 psi . the person i got the waste gate from was using a manuel boost controller does the wastegate need to be adjusted and if it does do i make it so the two nuts are closer or more far apart on the arm of the wastegate? very agrivated now.

 

Actually you can't make boost in neutral with Mopar wastegate/ECU. It's normal. On the older turbo dodges you could make boost in neutral but not with the SRT-4. Why would you want to make boost in neutral anyway except to boil your tires on launch.

If your Stage 2 is pulling timing at the top end it's because your exceeding the boost specification in the ECU or detonation is detected. It does that to keep you from frying your motor. Trying to get a few extra horsepower by forcing your boost is a fools game. I know a lot of misinformed folks are doing it but you may pay a price for it later. It's not worth the price to me and shouldn't be to you either.

 

actually the reason that the ecu pulls timing on the dyno has absolutely nothing to do with exceeding the sepcs of the programing. the srt uses the air temperature and pressure to determine the timing and other specs that the car will run at. on the dyno, the computer is smart enough to realize that the car isn't really moving and as such it think's something is wrong and pulls timing inorder to protect the engine. all the stage computers when left to their own control do this, not just stage 2. and as such, just about all s2 and s3 cars dyno lower than what you would expect them to if you compare their 1/4 mile times.

 

It most certainly does. If your inlet temp, map, boost level, etc. are out of the fuel map specs the ECU will take measures to prevent detonation. If you exceed boost the ECU will certainly pull timing! Yes, there are other times that may happen like you said, air temp etc but the most common reason is trying to force boost outside the fuel map specs. That is why people trying to force boost (waste gate mods) have to reset there ECU because it pulled timing. It may pull timing on a dyno because your not getting enough cold air into the intake. The ECU will drop max boost by controlling the waste gate to compensate and if it detects knock it will pull timing. It's all ECU controlled, timing, boost, fuel to keep you and your motor happy.

 

so i guess those numbers in scc mag where they installed the stage 2 after installing stg 1 where off the mark if im correct?[sm=feedback.gif]

 

yes. the scc people did quite a number of things wrong in that article. first off, they didn't allow the ecu time to learn. whenever you install a stage kit, they always run a little weird for the first hundred miles or so. this is the ecu learning. the scc folks didn't allow the ecu to go through this process, they just threw it on the car and drive 10 feet to the dyno. they did the same thing when they installed the dp. a lot of the numbers that they have come up with are wrong due to the way that they do things. even the guys who build the parts and go there to help them install them tell them these things and they don't care and don't listen to them.

mopar 1 - the theory is nice and all, but unfortunetly that's not what reality is showing. how many s2 cars have gone to a dyno and run a crappy 250 or so, and then gone out the next day and ran a high 12 at the track? a lot have. if s2 was trully pulling that much timing then everyone would be running mid 13's or so. the folks with s2 w/o toys who are messing with wga's and mbc's often do have that problem, but those of us that allow the ecu do to its thing do not see timing pulled at the track, only at the dyno.