Hey, Im having trouble getting enough fuel under boost, was wondering if there are any more little tricks I could try.
specs: Canadian 76' 242 n/a b21F + 12b turbo, M46, K cam, RSI economy valvetrain kit, 3" downpipe/exhaust, FAST wideband O2, Knocksense knock sensor, G80 LSD, E-fan, amazon BOV. - Used for autox/road course
My K-jet system is pre-lambda, so theres no fuel compensation or boost enrichment available. Ive got the cold start injector wired to a hobbs switch and activating at 0PSI. I have tried shimming the fuel distributor in 0.8mm increments up to 4mm (no more room for more shims so i tried using a solid plug which is ~2mm longer than fully shimmed distributor plug). Each time adjusting the CO screw in the k-jet unit to have an acceptable AFR, but i think i have hit the limits of this very early k-jet system.
The vehicle starts, idles, and mid range RPM is okay, even under full boost (only 5PSI currently), but as soon as im over ~4500rpm it goes lean quick (over 15:1), even when im 10.5:1AFR throughout idle to 3500.
Since there is no boost enrichment from this unit, and no lambda reference, is there anything else I can try to add fuel at higher RPMS?
Some thoughts that come to mind would be replacing the low flowing CSI for a higher flowing unit, or installing a newer style k-jet unit, but I was hoping to race this sunday and I cant think of a quick or easy fix to this issue.
specs: Canadian 76' 242 n/a b21F + 12b turbo, M46, K cam, RSI economy valvetrain kit, 3" downpipe/exhaust, FAST wideband O2, Knocksense knock sensor, G80 LSD, E-fan, amazon BOV. - Used for autox/road course
My K-jet system is pre-lambda, so theres no fuel compensation or boost enrichment available. Ive got the cold start injector wired to a hobbs switch and activating at 0PSI. I have tried shimming the fuel distributor in 0.8mm increments up to 4mm (no more room for more shims so i tried using a solid plug which is ~2mm longer than fully shimmed distributor plug). Each time adjusting the CO screw in the k-jet unit to have an acceptable AFR, but i think i have hit the limits of this very early k-jet system.
The vehicle starts, idles, and mid range RPM is okay, even under full boost (only 5PSI currently), but as soon as im over ~4500rpm it goes lean quick (over 15:1), even when im 10.5:1AFR throughout idle to 3500.
Since there is no boost enrichment from this unit, and no lambda reference, is there anything else I can try to add fuel at higher RPMS?
Some thoughts that come to mind would be replacing the low flowing CSI for a higher flowing unit, or installing a newer style k-jet unit, but I was hoping to race this sunday and I cant think of a quick or easy fix to this issue.