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it couldn't be made any richer... fuel pressure already too high. going higher with either the rise rate or the baseline resulted in higher pressures at first, but they quickly dropped. looks like bigger injectors are my only option. what a pain.
until then looks like i keep the high octane gas in the tank. http://www.hostboard.com/ubb/frown.gif
Wow! That's gobs of torque for a JRSC! Is that 8psi, Schwett?
What is a good (ideal) A/F ratio for our FI cars?
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6 psi JRSC GSR: GSS-317, 3" intake -> 217 hp/155 ft-lbs.
New: BTC, MAP controller, and stock timing!
Soon: Endyn stepper?
6psi. it's a basically stock (other than the JRSC) H22. thus the torque. http://www.hostboard.com/ubb/wink.gif
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by 217gsr:
Wow! That's gobs of torque for a JRSC! Is that 8psi, Schwett?
What is a good (ideal) A/F ratio for our FI cars?
<HR></BLOCKQUOTE>
Ah. . . I get it now. http://www.hostboard.com/ubb/smile.gif
What is your current fuel setup?
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6 psi JRSC GSR: GSS-317, 3" intake -> 217 hp/155 ft-lbs.
New: BTC, MAP controller, and stock timing!
Soon: Endyn stepper?
stock prelude 290cc injectors, cartech 2025, walbro gss-342, vafc. didn't do much to it with the VAFC once we saw that increasing the FP was having no effect. i guess i'll bite the bullet and go with some 370s. i don't want to go any bigger than necessary.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by 217gsr:
Ah. . . I get it now. http://www.hostboard.com/ubb/smile.gif
What is your current fuel setup?
<HR></BLOCKQUOTE>
schwett....why would you not adjust the VAFC??...the static fuel pressure shouldnt be relevant to the ability for the vafc to add or deduct fuel...unless you were already a max duty cycle??
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John
B18C1 Powered 95 Civic EX Coupe(Sold)
H22A Powered 92 Civic VX Hatch(In the works)
88 CRX(Coming soon)
can't add more than about 5-10% with the VAFC before the ECU sees positive pressure and freaks out. it helps a little, but not much.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by CivicR:
schwett....why would you not adjust the VAFC??...the static fuel pressure shouldnt be relevant to the ability for the vafc to add or deduct fuel...unless you were already a max duty cycle??
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I'm I not reading this correct? If your already on the rich side, why is there mention of getting bigger injectors? I can see that you may want to lower fuel pressure. But there is also mention of adding more fuel? If your already rich, and you have a VAFC, why not just cut down on the duty cycle to bring down the A/F ratio? I'm sure that would be good for some extra ponies....
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00 ITR#1416 JRSC 5.5PSI
JR BTC, JR Map controller
Cartech FMU, Comptech Ice Box, Clutchnet Clutch, CM aluminum Flywheel
Actually, his is not rich at all. The typical JRSC equipped car likes A/F ratios of about 12.2 - 12.6:1. Mark seems to be nearly a full point leaner at peak rpm.
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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
oddly, jim, when i run the datalogger, i get a solid .90-.92v reading from the stock O2 sensor, which is actually what most people told me was a good safe place to be. i don't understand why other jrsc lude drivers are able to get it richer with the stock setup. mine certainly couldn't handle any more fuel pressure.
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
Actually, his is not rich at all. The typical JRSC equipped car likes A/F ratios of about 12.2 - 12.6:1. Mark seems to be nearly a full point leaner at peak rpm.
<HR></BLOCKQUOTE>
I wonder if there was/is a calibration issue with the Wideband O2 that you were using on the dyno ???
Your HP/Torque numbers look fairly decent, and are not typical of a car that is running on the lean side.
Can you get a second opinion... different dyno location ???
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'93 Civic Si H/B with B18C1, JRSC @ 8psi
Best 1320: 12.68 at 110 mph
Add to that the fact that does NOT look like the power curve of a detonating car (which he SHOULD be running any boost at 14:1) so something seems screwy. Also it seems very odd that he gets richer as RPMs rise... maybe raising static pressure and reducing the rise rate would be more appropriate.
Oh yeah and that pump probably isn't helping much running an FMU setup.
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
I wonder if there was/is a calibration issue with the Wideband O2 that you were using on the dyno ???
Your HP/Torque numbers look fairly decent, and are not typical of a car that is running on the lean side.
Can you get a second opinion... different dyno location ???
<HR></BLOCKQUOTE>
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are you pretty certain that running a bit richer actually would yield more power on this setup? i assumed by the loss of torque at the top that when i increase fuel and drop the a/f by a point or so, i'll lose a bunch of power. it needs to be done, but i wasn't looking forward to that aspect of it.
there is another dyno in the area i could go to. it's just such a pain b/c they're all closed on weekends.
it was a pretty cold day, which might have had some effect. i don't know what other factors are relevant; i was running 94 octane gas because i'm still concerned about detonation. the car on the dyno after me, a fairly stock M3, was showing the sort of ratios i would've expected...
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JRCivic:
I wonder if there was/is a calibration issue with the Wideband O2 that you were using on the dyno ???
Your HP/Torque numbers look fairly decent, and are not typical of a car that is running on the lean side.
Can you get a second opinion... different dyno location ???
<HR></BLOCKQUOTE>