OK, finally got a chance to get everything back together. Had an initial issue with the 800CC injectors, but once the latency was sorted, the car idled as smooth as it did on 440cc S15 injectors. Also, A/F ratios are MUCH more stable, the MAP itself is much smoother and everything seems to be working much better.
This is a base map tune with a small fiddle with the A/F and no added timing (stock timing map). The boost is regulated via a Greddy Profec-Spec 2. I will surely be upgrading to a MAC solenoid and having the ECU control boost. I am sure once I can control wastegate duty cycle via RPM and not just globally, it will hold the boost till redline.
Setup
Stock IM
800CC STI injectors
EFR 6258 bottom mount with Tomei/Ichiba modified manifold
3 inch Apexi Noir
2.5" intake piping
Nismotronic ECU
180SX blacktop rebuilt
So far, LOVING the numbers! The car just runs much better without the old sheetmetal manifold seemingly developing small unseen cracks and causing all sorts of wacky tuning problems.
There will be MORE to come! Seems this is barely above stock wastegate preload, so I have a ton left on the Greddy EBC. Boost will be cranked up shortly to really let this turbo sing!
250+ ft lbs of torque from 3900 all the way to 6000 RPM is very nice let me tell you! In addition, the cable someone got unplugged from the laptop for my log after adding timing in vacuum regions, so the spoolup will also be better in future revisions! I will try to get another few VD runs in before the weekend.
Also, smoothing of 5 means a little less HP, but really isn't much different than smoothing of 3. However, at 3, you can see where the boost spikes midrange and tapers off.
Watch this spot
PS Look at the Night and Day spool difference between the old (intake) manifold with all the leaks and issues and my basic stock one! It's almost comedic! Also, do not pay attention to the boost. The offset for the MAP sensor is a little off. The old runs were at 21 or 22+ psi and tapering to something like 17-18.
