Hello all,
Can a lean condition prevent a motor from revving out to redline acting like a rev limter? There is a lean spot that happens when tps gets above 20% and the car just wont rev past 3k rpm.
At idle i get about 85 kPa.
thanx
Max
93 Supra turbo with FAST/edist/dis4 and 5 bar kalvaco map
well if your engine is getting zero fuel (really lean), then it won't rev any more.
If it runs "leaner than it should" (17:1?) then you will be rev limited by piston chunks flying everywhere, slowing the engine down.
Other than that, you don't want a "lean condition" to act as a rev limiter. If you are running lean, either fatten it up or save your $$ for a new motor.
Seriously, if you idle at 85KPA, you have something wrong. However you say that you have a 5 bar sensor- I don't think these will work with FAST (without some big-time tinkering), you might need a 3-bar.
I run the 1/4 mile at 85 KPA or so- I'd be amazed if you idle at 85 KPA.
Cam specs are here: http://www.moreboost.org/cams.htm
I have the HKS 264 cams. As far as idle my boost guage shows about 12" vac as it did last year. I'm begining to think it's the 5 bar map sensor.
It's the 5 bar sensor. I'd expect 12 " vacuum to be in the upper 40's to low 50's.
Bob C. You go through the traps at 85 kpa ? Does the sensor read 99 to 101 kpa with the motor off / key on? If so that puppy needs a bigger air filter or a larger throttle body. Hmmm, do I remember you mentioning hood clearance problems ?
Originally posted by bobc455 If it runs "leaner than it should" (17:1?) then you will be rev limited by piston chunks flying everywhere, slowing the engine down.
Seriously, if you idle at 85KPA, you have something wrong. However you say that you have a 5 bar sensor- I don't think these will work with FAST (without some big-time tinkering), you might need a 3-bar.
I have not been able to drive the car. I've been just playing with VE and AE while the car is parked and just revving. It wasn't going over 3k rpm. The leanest it shows is 15.9-1 when the tps gets to 20%. I've gotten a version of Ccom for windows that has a 5 bar option from FAST. Maybe FAST is using a different 5 bar sensor. Last nite while looking over the logs i did notice also the strange map readings. I will try a 3 bar today as well as contract FAST and verify what 5 bar sensor they used.
