PE Questions 6E
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Joined: Apr 2005
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
PE Questions 6E
So in order to get my head around tuning I am studying the stock ARAP bin.
PE v Temp give +26% through the warmed up temps
but PE v RPM gives +6% at 2800 , 0% at 3200 then -7% through to max RPM.
I would have though you want want to maintain enrichment a little higher even allowing for the TPI limitations.
At the same time the ARAP is adding in 9 degrees of spark at 3200 only.
More spark and less fuel = knock ?
PE v Temp give +26% through the warmed up temps
but PE v RPM gives +6% at 2800 , 0% at 3200 then -7% through to max RPM.
I would have though you want want to maintain enrichment a little higher even allowing for the TPI limitations.
At the same time the ARAP is adding in 9 degrees of spark at 3200 only.
More spark and less fuel = knock ?
Joined: Mar 2000
Posts: 1,692
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From: Corona
Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: BP383 vortech, BP383, 5.7 TPI, LG4
Transmission: 4L60e, 700R4, 700R4..
Axle/Gears: 3.27, 2.73
Re: PE Questions 6E
16% enrichment will get you to about 12.7:1 A/F. So, there really isn't any "less fuel" going on there, with 19% still in it.
I'm not sure, but I think the ARAP calibrator was trying to get the thing to knock, and then ride the knock sensor the whole time at full throttle.
I'm not sure, but I think the ARAP calibrator was trying to get the thing to knock, and then ride the knock sensor the whole time at full throttle.
Thread Starter
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: PE Questions 6E
"16% enrichment will get you to about 12.7:1 A/F. So, there really isn't any "less fuel" going on there, with 19% still in it."
So the % numberss are accumulative, so there would be 26 + 6 % at 2800 ?
" I think the ARAP calibrator was trying to get the thing to knock, and then ride the knock sensor the whole time at full throttle."
ARAP timing appears fairly aggressive. I have one knock passing through
3000 that is pulling timing. Have lowered the spark in this area but are seeing more knock now.
So the % numberss are accumulative, so there would be 26 + 6 % at 2800 ?
" I think the ARAP calibrator was trying to get the thing to knock, and then ride the knock sensor the whole time at full throttle."
ARAP timing appears fairly aggressive. I have one knock passing through
3000 that is pulling timing. Have lowered the spark in this area but are seeing more knock now.
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