200whp with stock N/A rotating assay? by ForcedFirebird

3 minute(s) of a 31 minute read

Had a little help from my friends (**singing horribly out of tune**).

9-11-2014

It's a track only car, they will be run open. The car only does 20min sessions.

Will let you know what they do with a 272, ported head, 272 cam and headers/exhaust.

They were tested previously on a bone stock m20 which made a baseline of 150whp, adding the ITB's made 174. 24whp increase on a tired m20 is significant, 16% increase from a bolt on...

http://www.e30tech.com/forum/showthread.php?t=118357

To add, the tune would be useless.

We are tuning the stock Motronic. Currently working on another m20 with ITB's. We have the car running, and are just getting into the tuning stages on this one (pic from last week, it's all buttoned up now)...



We will soon have 3 different setups. I also have ITB's on my m50 powered e36 beater, also running stock Motronic...

Alpha-N, no load compensation. I use an emulator to tune on the fly and a chip burner to burn the final tune.

Because I'm using a 0-5v TPS in place of the AFM. In fact your tune by default was on my emulator from the dyno session earlier in the thread. Car starts and runs, but not good at all. Any touch of the throttle and the AFR's immediately jump to mid 20's. We played with th eTPS angle to match the voltage outputs of the AFM, but the ECU is expecting a LOT less air to be entering the system so early. It's going to take hours of tweaking to get it to run properly. Will post a video of it's current running condition on Extrudabody setup, but the car this thread is about will have similar traits.

Can't embed since it was just uploaded, but here's a demonstration of what's happening now with th eECU in stock configuration.

This is going to take a while. The 413 variants have an AE table that helped a lot with the throttles "gulping" air when a lot of throttle was applied.

m50 TPS wired in place of the AFM, angled to read the same voltage at 0 throttle as the AFM did at idle. Using Tunerpro's tracing, I verified the ECU is seeing basically what it would if the AFM were there. I think it's because the AFM door would open more gradual than the 5v signal is moving with the M50 TPS directly on the throttle shaft.

Basically I am doing the same here. The OEM TPS switch and the m50 variable TPS are both on there with the TPS (m50) going back to AFM input. To do this, he will have to rotate the TPS to match the AFM voltage. Still working out bugs.