To better understand how I ran my back-to-back runs of 13.08 & 13.12 last weekend in my bone stock '96, I decided to temporarily hook up a boost gage and see if perhaps I was running more than expected boost. Well, I found two surprises, 1st I am spiking all the way to 14psi (higher than I expected) but then the wastegates pull it back to around 7.5 for the high rpm region (less than I was expecting). Note that I made several runs in 2nd and 3rd gear with a friend recording the results in the back seat and the results were very repeatable. I also made some simulated 1/4 mile runs (minus a hard launch) and saw that much of the run is at the high rpm (low boost) region. In fact, with my 5,000 - 6,000 rpm launches I likely never saw the 14psi spikes. I may be quicker short shifting at around 5,800 rpm and will do so if I ever race the car again.
What do you guy's think? Anyone else carefully look at boost on a stock car (1st or 2nd gen)? Another test I'd like to run is put some 100 octane in and see if my boost curve looks any different. Perhaps I'm knocking at 14psi and I'm losing spark & boost? I like my '92 much more when it comes to understanding the ECU (datalogging).
Another interesting characteristic of the curves is the fact that 3rd gear places more load on the engine and builds boost in the lower rpms. I bet if I did a WOT run in 6th, I'd spike at ~2,500 rpm (the rated peak torque of our engines).
What do you guy's think? Anyone else carefully look at boost on a stock car (1st or 2nd gen)? Another test I'd like to run is put some 100 octane in and see if my boost curve looks any different. Perhaps I'm knocking at 14psi and I'm losing spark & boost? I like my '92 much more when it comes to understanding the ECU (datalogging).
Another interesting characteristic of the curves is the fact that 3rd gear places more load on the engine and builds boost in the lower rpms. I bet if I did a WOT run in 6th, I'd spike at ~2,500 rpm (the rated peak torque of our engines).