bogging down
11-19-2006, 12:35 AM
#1
1.5 BAR
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Join Date: Dec 2005
Posts: 1,129
bogging down
the story,
91 crx si with a stock b18c converted to obd1 running a stock p72 w/ vafc.
at WOT ~4000 rmp it bogges down a little and as soon as it passes everything works fine. at partial throttle everything goes smoothly.
engage point is set at L to H @ 4600rpm and H to L @ 4400rmp.
anyone have any idea why this would happen at WOT at approximately 4000rpm ??
91 crx si with a stock b18c converted to obd1 running a stock p72 w/ vafc.
at WOT ~4000 rmp it bogges down a little and as soon as it passes everything works fine. at partial throttle everything goes smoothly.
engage point is set at L to H @ 4600rpm and H to L @ 4400rmp.
anyone have any idea why this would happen at WOT at approximately 4000rpm ??
11-19-2006, 04:53 PM
#4
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: bogging down
What's the stock ecu's vtec crossover point? Did you set any enrichment on the afc with the new vtec setting? I don't know if the original vafc's have this, but on my vafc2 I can enrich or take fuel out at the vtec crossover point if it's higher or lower than stock. Are you using the afc to run a larger injector or what? For some reason afc's don't seem to jive too well with stock ecu's as far as partial throttle drivability too. Just remember that any fuel corrections you might have made with the afc also reflects on advancing and retarding the timing as well.
11-19-2006, 05:05 PM
#5
1.5 BAR
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Re: bogging down
Originally Posted by slo_crx1
What's the stock ecu's vtec crossover point? Did you set any enrichment on the afc with the new vtec setting? I don't know if the original vafc's have this, but on my vafc2 I can enrich or take fuel out at the vtec crossover point if it's higher or lower than stock. Are you using the afc to run a larger injector or what? For some reason afc's don't seem to jive too well with stock ecu's as far as partial throttle drivability too. Just remember that any fuel corrections you might have made with the afc also reflects on advancing and retarding the timing as well.
i changed it back to 5k and it would still bogg down at around 4k and vtec would still kick in at 5k.
any ideas ?? could it be the tps ??
11-20-2006, 06:02 AM
#8
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Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: bogging down
It could be the tps if anyone's ever messed with it. Nice thing with the afc's is a handy little built in sensor check. It'll tell you the voltage reading at closed and wot, that way you don't have to mess around with a dmm. 
11-20-2006, 08:52 AM
#9
1.5 BAR
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Join Date: Dec 2005
Posts: 1,129
Re: bogging down
Originally Posted by jagojon3
Have you tried disabling the vtec engagement and everything else on the vafc and running straight off the ecu to see if it still happens?
till then anyone have any other suggestions ??
