Hot Rod says a carb will usually make more HP than EFI
12-13-2009, 10:07 AM
#61
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To correct the public record, i should have stated the 4165-6210, not a 4165. It is a Double Pumper, my street favorite, because Holley has tuned it for 327, 350 and 402 Chevy engines 1965-1970. The primarys do not need oxygen sensor tuning. Just put it on and drive, as long as it idles at 800 or lower and has 12" vacuum or higher.
I agree a generic carb that needs tuning is a big waste of time; the holley catalog is full of application specfic carbs; I'd not put a "universal performance" carb on any street car. Common mistake. Reports here on CF are that they run too rich. here is my article http://community-2.webtv.net/MATTGRU/carb/page2.html
So you can't just can't put on "a generic carb that needs tuning", yet you suggest people buy a 6210 and not adjust it?
Or does the Holley not constitute a generic carb, because there's nothing on the Holley website that says it's specifically for 350 SBC, that makes it generic in my book. Maybe you could tell us some 'generic' carb brands? Or maybe you're suggesting a tweaked Holley, in which case what make and where?
Maybe you could tell me where "the holley catalog is full of application specfic carbs", cos I can't find it.
All it says is the 6210 is 'Designed as a emissions legal performance replacement for Q-jet on certain GM applications'. Not for a specific engine size, CR, cam, exhaust or even a chassis and year!
12-13-2009, 10:37 AM
#62
Race Director
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I have the paper catalog.
Golden,
u seem to have excellent EFI knowledge
please answer my Q.
4.11 NO OD what mpg can i get w/EFI? Engine details in profile.
Todays test w/ 4165-6210 stock jetting in primary, 19 mpg.
Golden,
u seem to have excellent EFI knowledge
please answer my Q.
4.11 NO OD what mpg can i get w/EFI? Engine details in profile.
Todays test w/ 4165-6210 stock jetting in primary, 19 mpg.
12-13-2009, 12:29 PM
#63
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Well bearing in mind I can get 24mpg out of a humble 625 CFM Carter, at least that.
12-13-2009, 01:49 PM
#64
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24 sounds good! There must be something wrong with my car 
So i spent an hour checking it, and found it needed 2 degrees more base timing.
The guy that said a timing computer is needed was RIGHT ON! My motor wants 9* more at idle, but i have no easy way to reduce it at cruise, as it will surge then.
Remember guys, i'm not claiming 19 mpg is unusual for a good tune! Golden, do u have a 4.11, NO OD?
When i had a 3.36 i got 3 mpg more. That would be 22. And with 2* more, we should be close!
The re-tune used 0.25 gal. That's $0.69 for regular at 2.75/gal. Golden, u use 87 octane? And we both don't expect a significant mpg increase with efi?
So i spent an hour checking it, and found it needed 2 degrees more base timing.
The guy that said a timing computer is needed was RIGHT ON! My motor wants 9* more at idle, but i have no easy way to reduce it at cruise, as it will surge then.
Remember guys, i'm not claiming 19 mpg is unusual for a good tune! Golden, do u have a 4.11, NO OD?
When i had a 3.36 i got 3 mpg more. That would be 22. And with 2* more, we should be close!
The re-tune used 0.25 gal. That's $0.69 for regular at 2.75/gal. Golden, u use 87 octane? And we both don't expect a significant mpg increase with efi?
Last edited by Matt Gruber; 12-13-2009 at 01:58 PM.
