That's the problem I never went with the 1:1 setup for very long...no matter what you do you're always rich at some point and it's harder to tune. These cars would be much better suited with like a .7:1 boost reference...so for every 1psi of boost we get .7psi of fuel. There was a guy back in the day (camlifter maybe?) that used a nitrous bleed in his boost reference line in order to do this and he had good sucess with it. I would say try taking the reference off and retune that way. If you're aiming for 23psi start your fuel pressure around 55psi and go up or down from there.
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O4 PT Cruiser non GT
Stock b****es, come get me
Sporting new Nikon D40 w/18-55 & 55-200...it's a learning curve that's for sure!
every car is different bud...there's only one way to find out if you're going to be lean or not lol. I only run 47psi fuel pressure on my 57 trim, and it supports 21psi no problems with out the 1:1 reference. I'm pulling 4% from 4500-redline and I'm 11.8 afr through that area.
I did that on static with a 52/53, 650cc and my S1PCM/S3Turbofold with 22psi/21holding and it was right at the sweet spot. Anyways, it is now at 33 boostsource and like turbocruiser says it will be run richer and it would be kind of a bish to fine tune with the SAFCII. I have it at 0 right now and making 357hp with this and pleanty of room to tune. I'm taking to a dyno this week hopefully
I changed it to 55 static, I get into the 9's a/f until 4300 or so then creeps up higher. And by 5600 or so I get 12.5. So I dont know if I should up the pressure some or go back to boost.
With the boost source: I didnt want to go below 43psi because the injectors were rated for 43. The guy above, you went down to 33?? Thats REALLY low for 650cc.
W/O boost: How high can I go with it being safe/fine? I dont want to go to high, Im already at 55.
Being in the 9's on your wideband actually isn't all that good...you can wash out the cylinders and you'll be just flat out slow. Try pulling some fuel from your bottom end....while building boost you can pull out a ton of fuel and not worry about knock or anything like that. I think from idle-about 3krpms I'm pulling between 15-20% then up towards redline I'm only pulling 4%.
I changed it to 55 static, I get into the 9's a/f until 4300 or so then creeps up higher. And by 5600 or so I get 12.5. So I dont know if I should up the pressure some or go back to boost.
With the boost source: I didnt want to go below 43psi because the injectors were rated for 43. The guy above, you went down to 33?? Thats REALLY low for 650cc.
W/O boost: How high can I go with it being safe/fine? I dont want to go to high, Im already at 55.
Dude, 33 is NOT too low! You'll not be on boost all the time and that will put your 650cc injectors at 569.42cc. Stock one on 04/05(stage 1's on 03) run 577 at 58psi so as you can see, NO it is NOT to LOW.
See, here's your clue, if you are at 55 static and going to 12.5 at 5600rpm, then u need to up it just a bit (let's say 57/58 and see if it runs at mid to high 11's on AFR's at redline) then from that pressure you'll substract the amount of boost that you are making and that will give you the adviseable fuel pressure or at least a starting poing if you are running with a boost pressure signal. Remember that you are running larger than stock injectors and you want to iddle and cruise good with them (during VAC). I'm getting about 90 to 100 miles on 1/4 of a tank and the car is running good. I'm only boosting like 21 PSI and that will net me at about 54psi of fuel pressure (728.41cc on the injectors)when that boost hit so I'm good to go as far as fuel goes (veryfied with the wideband). Again, all cars are different so that's why you most get your static point first like you were doing and substract from there whatever amount of boost your are running (only on boost source). Then you can fine tune it with the SAFCII like TC13 said. I'm running rich myself and haven't really mess with the SAFCII but I'll be doing that next week at a dyno (don't have much time to play lately). Hope that helps!
Dude, 33 is NOT too low! You'll not be on boost all the time and that will put your 650cc injectors at 569.42cc. Stock one on 04/05(stage 1's on 03) run 577 at 58psi so as you can see, NO it is NOT to LOW.
See, here's your clue, if you are at 55 static and going to 12.5 at 5600rpm, then u need to up it just a bit (let's say 57/58 and see if it runs at mid to high 11's on AFR's at redline) then from that pressure you'll substract the amount of boost that you are making and that will give you the adviseable fuel pressure or at least a starting poing if you are running with a boost pressure signal. Remember that you are running larger than stock injectors and you want to iddle and cruise good with them (during VAC). I'm getting about 90 to 100 miles on 1/4 of a tank and the car is running good. I'm only boosting like 21 PSI and that will net me at about 54psi of fuel pressure (728.41cc on the injectors)when that boost hit so I'm good to go as far as fuel goes (veryfied with the wideband). Again, all cars are different so that's why you most get your static point first like you were doing and substract from there whatever amount of boost your are running (only on boost source). Then you can fine tune it with the SAFCII like TC13 said. I'm running rich myself and haven't really mess with the SAFCII but I'll be doing that next week at a dyno (don't have much time to play lately). Hope that helps!
I ran 60psi and it was still lean up top so I switched it back to boost.
Im at 38psi right now and Ill go from there. Ive just read many times that running too low of a pressure is not that great.
Also, Im on the Stage 2 pcm, so it a different idle but I did that math already.
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Pulling too much fuel for my setup?
Linear Mode
