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 7Likes
06-20-2016, 04:23 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
New carb, coil, plugs, wires. All less than 100 miles. Had so much trouble with EFI - so I pulled it and replaced with new new carb & other hardware. Now trying to get carb working.
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06-20-2016, 04:30 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Ok, let's get your vacuum gauge and wideband O2 set up, then something might stand out.
Did you buy the Quick Fuel as a custom carb or a "generic" tune?
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06-20-2016, 04:41 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
It's one of my custom Q-750's.
Try the 6.5 PV before you do anything else. Your logic up above is correct. If it fixes it, I'll reimburse you for the PV you bought.
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06-20-2016, 04:58 PM
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CC Member
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Join Date: Feb 2012
Location: Keller,
TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
Posts: 549
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Not Ranked
Quote:
Originally Posted by blykins
It's one of my custom Q-750's.
Try the 6.5 PV before you do anything else. Your logic up above is correct. If it fixes it, I'll reimburse you for the PV you bought.
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Thanks, but I'm not worried about the cost of a PV. After all the money I put into the EFI, two EFI CPUs, 3 WBO2 sensors, EFI distributor, Ford module, high pressure fuel pump, etc - then the cost to rip it all out and go back to carb... the cost of a PV is nothing. I just want to get it working. I fought the EFI for almost two years, constantly at the computer working on the "tune". This carb already idles and cruises better than the EFI did.
Talking to Scott, he didn't remember my carb or what he put in it. He said he usually puts 6.5 PVs in manual shift cars and 4.5 PVs in automatics. This has the 4.5.
I'll change the PV first, set the timing at 34, hook up the vacuum gauge, and see what happens, then report back. It will be Wednesday before I can get back to it. Stuck in Chicago with a four hour plane delay.
Last edited by Texasdoc; 06-20-2016 at 05:08 PM..
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06-20-2016, 05:04 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Not Ranked
Don't worry about messing with the timing. You don't want to change too many things at one time. I'd change the PV and take it for a drive.
The comment up above about 34° being right for a 408 is not necessarily true. It's not dependent on cubic inches at all, but total timing is mainly a function of the cylinder head and the compression ratio. One 408 with an Edelbrock head may want more timing than a 408 with a Trick Flow head, just because the combustion chambers are not made the same. It's ok to change timing later on to see if you can tell a different in your buttmeter, but don't change everything at once.
I'm confident that the PV change will make her run like a mashed cat. After that change, you can read the spark plugs to fine tune it.
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