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Weber Tuning
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http://www.clubcobra.com/forums/weber-tuning/)
| bmace |
08-16-2007 03:38 PM |
New Crate GT-40 Webers Carb setup
Pleased to find your CC site.....here goes 1st post
Im running a Crate GT40 T56 6 speed and have prob with the low end off idle
with my IDF48's on base setting idle is fair except when temps are running hot then it becomes rather crappy. I then get backfiring through the stacks off & on untill I reach approx 2500-2800 & then it pulls steady & smooth.
I'm still reading all the redline/Inglese stuff but was wondering if anyone has been through htis in hopes you might recommend idle jet sizes along with any other help . much appreciate any adv Sincerely bmace
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| zrayr |
08-18-2007 07:52 AM |
Quote:
Originally Posted by bmace
Pleased to find your CC site.....here goes 1st post
Im running a Crate GT40 T56 6 speed and have prob with the low end off idle
with my IDF48's on base setting idle is fair except when temps are running hot then it becomes rather crappy. I then get backfiring through the stacks off & on untill I reach approx 2500-2800 & then it pulls steady & smooth.
I'm still reading all the redline/Inglese stuff but was wondering if anyone has been through htis in hopes you might recommend idle jet sizes along with any other help . much appreciate any adv Sincerely bmace
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is your cam Weber friendly?
Z. Ray |
| Brent Mills |
08-18-2007 10:55 AM |
That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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| bmace |
08-19-2007 10:25 AM |
Quote:
Originally Posted by Brent Mills
That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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Sorry.....idle jets are 55ml,air corr 180m, main 150m, chokes 40m |
| 68gt500 |
08-22-2007 05:16 AM |
I would recomend gtting a wide band o2 sensor setup, like the Innnovate LC-1.
It takes away most of the rich lean guessing and allows you to pinpoint the sources of drivability issues.
Do you have the 3rd transition hole drilled ? On my setup it made a world of a difference.
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| bmace |
08-23-2007 12:28 AM |
Quote:
Originally Posted by 68gt500
I would recomend gtting a wide band o2 sensor setup, like the Innnovate LC-1.
It takes away most of the rich lean guessing and allows you to pinpoint the sources of drivability issues.
Do you have the 3rd transition hole drilled ? On my setup it made a world of a difference.
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68GT500
Pardon my ignorance..........pls explain "drilling 3rd transition hole" thks bmace |
| zrayr |
08-23-2007 06:54 AM |
Quote:
Originally Posted by Brent Mills
That's either the cam with too much overlap as Z. Ray suggests or it's a lean condition. The only reason I shy away from it being too lean is because you note that it starts happening after things are warmed up, which tends to make the A/F ratio go more rich. Maybe post your cam specs and your carb specs (idle/main jets, chokes, correctors, etc, etc).
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Brent,
do you know the cam spec parameters for using Webers ?
thanks,
Z. Ray |
Ideally a 50/50 camshaft is recommended. Not to say that if you have a "hot" cam with a lot of overlap, a thumpty-thump sound when at idle, that Webers won't work, they'll just be a PITA to get into tune and run properly though if it is a "radical" cam as some people run you may never get Webers tuned up.
I have a 289 with a mild cam just slightly hotter than stock and Webers.
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| ENTDOC |
08-27-2007 10:59 AM |
40 chokes are too big for a small block,go with 37's max, this should help your low end and off idle characteristics
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| Terry Brown |
08-27-2007 11:15 AM |
Would you think 40s are too big if the SB is stroked to 408 or 427?
Tks
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| bmace |
08-30-2007 06:49 PM |
Quote:
Originally Posted by ENTDOC
40 chokes are too big for a small block,go with 37's max, this should help your low end and off idle characteristics
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Thks Entdoc for the choke adv. I agree as local weber gurus
have mentioned similar ideas. much appreciate you input.
Sincerely
bmace |
| ENTDOC |
08-30-2007 07:40 PM |
Terry, 40's may be fine for those applications at least for the 427 stroker. Many feel 40's are too big for even a stroked 427so,that has not been my experience at all and seems to cure the over rich situation . I do think they are too big for 302's however.
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