Tweet
General Turbo setup questions
I just finished tunning my Fiero turbo setup and was wondering how much timing advance other people is running under boost at high rpms. I currently have my spark advance tables as low as 18 degrees. Should I run lower? My AF ratio stays between 11.5 and 11.8 at WOT. Also what are the highest Air Temperature you guys have seen on your turbo setups? Mine goes no higher than 140*F and that's with an AWIC setup @ 8 psi.
-
-
Your timing appears on the mark at full throttle for iron heads if that's what you're running. There maybe room for more.Originally posted by yeyo_racing View Post
I was just about to say ditch the AWIC for an air to air unit until I noted the car is a Fiero. I ran a front mount intercooler plumed through the rocker skirts on my Fiero with twin turbos and 7 psi and brought my intake air temps down from 214 deg to 102 deg. The lower temp was with a brief run and could possibly have cooled the air even more had I conducted a sustained run under boost before disassembling it.
I removed both the intercooler and the twin turbos to simplify things with a single turbo. I just mounted the water/meth injection pump and tank yesterday and will probably test the effects of preturbo injection sometime today to gauge its ability to cool the charge coming out of the turbo before a second nozzle sprays at the throttle for the secondary and traditional effects. -
Thanks Joseph, I was hoping you could chime in and provide me details since you're the only guy here that I have talked with before of turbo Fieros. Yes it is for Iron heads. Do you have any pics of that air to air setup? Sounds interesting. I went with an air to water since it's easier to plumb and you can always drop in a huge cube of ice to lower the temps even more before a race.
BTW, I was able to get a pretty decent tune with the stock ECM and Ostrich. The innovate WB made things so much easier. I can't belive it's only been a week and I already have the car dialed in, thought that it was going to take me longer. However it stumbles and misses for a brief period once it goes into closed loop, can't figure out why. It was doing it before I made the turbo setup with the mail in chip, so I know it's not something I added from the previous setup. For now I'm running it in open loop, it runs almost perfect.Comment
-
I have some tuning planned tonight in closed loop with emulation as I have a problem there as well where the rich/lean crosses as observed on the gauge can be felt in the car. I'm not sure if it's because there's too much fuel and it's pulling it with a pause, or dropping to lean with a brief pause because there's not enough fuel at that point. None the less, it ran better in closed loop but a little on the rich side which I want to clean up because so far without the tuning being complete it ran 29 miles hwy on a gallon in open loop a little on the rich side for ~95% of the drive so there should be at least 32 mpg hwy in it if not more cruising a little on the lean side.Originally posted by yeyo_racing View Post
Your closed loop stumble maybe associated with your coolant temp vs. timing correction table if your code mask has one or another table that makes a fuel or timing adjustment with engine temp change. My tune irregularity starts right around 190 deg and at that temp timing is reduced a couple of points to avoid detonation. I may have to tighten that table and do an overall reduction in the main spark table to reduce the effects.
Comment
Comment