Turbo upgrade project is almost done

Pete_89T2 · 03-16-2011, 06:06 PM

Well guys, the tuning session with Dave B. at Speed1 was done last Friday, car set up per previous post. On the first dyno pull, my boost was very inconsistent - curve looked like white noise, and Dave quickly determined that the restrictor "pill" that was supposed to be in the vacuum line leading to my MAP sensor was missing. He replaced the pill with a spare he had and it was off to tuning. End result was 209 rwhp @ 6500 RPM, 188 ft-lbs torque @ 5200 RPM.

I was expecting a little bit more, but it turns out my setup with the stock ECU boost controls was maxing out at only 5.5 lbs of boost, so in that respect, these numbers are pretty good. It should have been boosting in the 7~8psi range. Dave believes that my stock main cat, which still works great from an emissions perspective, is a bit too restrictive and the backpressure is cracking open my wastegate, limiting me to 5~6 psi boost. The other thing limiting my HP/torque was my heat soaking stock TMIC -- after 1~2 pulls, we were seeing intake air temps soar over 150*F. Moving on the open road, that would be less of an issue. Anyway, this is good enough for now, at least until I get through my next scheduled trip to the MD emissions sniffer test in June....

At that point, the plan is to find a good presilencer/DP combo to swap out the main cat with and go back to Dave's to extract more ponies out of this thing. With that in mind, does anyone have recommendations for a good presilencer? Preferably one that is a one-for-one direct replacement for the main cat? I'm currently running the RP/Bonez downpipe, into the stock "mid" pipe, so it would be nice to save some cash by reusing those parts if possible. Would be easy to have an exhaust shop fabricate a straight-thru pipe for me, but I suspect the result might be loud & drone on the highway.

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03-16-2011, 06:06 PM	#2
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Well guys, the tuning session with Dave B. at Speed1 was done last Friday, car set up per previous post. On the first dyno pull, my boost was very inconsistent - curve looked like white noise, and Dave quickly determined that the restrictor "pill" that was supposed to be in the vacuum line leading to my MAP sensor was missing. He replaced the pill with a spare he had and it was off to tuning. End result was 209 rwhp @ 6500 RPM, 188 ft-lbs torque @ 5200 RPM. I was expecting a little bit more, but it turns out my setup with the stock ECU boost controls was maxing out at only 5.5 lbs of boost, so in that respect, these numbers are pretty good. It should have been boosting in the 7~8psi range. Dave believes that my stock main cat, which still works great from an emissions perspective, is a bit too restrictive and the backpressure is cracking open my wastegate, limiting me to 5~6 psi boost. The other thing limiting my HP/torque was my heat soaking stock TMIC -- after 1~2 pulls, we were seeing intake air temps soar over 150*F. Moving on the open road, that would be less of an issue. Anyway, this is good enough for now, at least until I get through my next scheduled trip to the MD emissions sniffer test in June.... At that point, the plan is to find a good presilencer/DP combo to swap out the main cat with and go back to Dave's to extract more ponies out of this thing. With that in mind, does anyone have recommendations for a good presilencer? Preferably one that is a one-for-one direct replacement for the main cat? I'm currently running the RP/Bonez downpipe, into the stock "mid" pipe, so it would be nice to save some cash by reusing those parts if possible. Would be easy to have an exhaust shop fabricate a straight-thru pipe for me, but I suspect the result might be loud & drone on the highway.