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05-11-2014, 10:10 AM
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#1 |
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Member
Join Date: Feb 2011
Posts: 10
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Hellp me tune my carburetor...
I'm new here (again). I bought a Miata with an LS1 in it a few years ago but sold it before I really got to mess with it. I posted a couple of times but things didn't work out with the build (rebuild) so I dropped out. Well, I did it again. I bought a Miata with an automatic and 383 stroker in it out of Iowa. The car has a Holley 670 in it. I don't know who did the setup on this thing but it runs horrible. It idles ok but just doesn't have the smooth power that it should have. There is a dead spot and just bad performance in general. The only work I have done on it so far is to fix the bowl levels. The primary bowl was way too full and the secondary bowl adjustment was bottomed out with hardly any fuel in there.
So, I'm wondering if there are any guys in here who are good with carb setups that might be willing to give me some tips on where to start? 
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05-11-2014, 10:16 AM
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#2 |
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Senior Member
Join Date: Apr 2008
Location: Summerville
Posts: 12,039
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Give me a call at the shop tomorrow. 843-225-1142
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 Charleston Performance Solutions 4560 Rivers Ave. N. Charleston SC 29405 843-225-1142 https://www.facebook.com/CharlestonPerformanceSolutions www.facebook.com/Selepack |
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05-11-2014, 10:51 AM
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Member
Join Date: Feb 2011
Posts: 10
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Quote:
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05-11-2014, 01:25 PM
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#4 |
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Senior Member
Join Date: Aug 2009
Posts: 3,774
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Get a bigger carb... 750 or 850 double pumper. The 670 you have is probably a vac secondary. I have a 750 dp I just took off a 383. I will take $150 for it and you can try it out first.
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05-11-2014, 03:00 PM
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#5 | |
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Senior Member
Join Date: Oct 2009
Location: Summerville
Posts: 4,431
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Quote:
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Griffin Transmission -Home of the most badassest Monte Carlo- Cell: 843-276-0554 Shop: 843-793-4607 04 RSX 06 Ridgeline 86 Monte Carlo |
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05-11-2014, 11:45 PM
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#6 |
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Senior Member
Join Date: Feb 2011
Location: Moncks Corner,S.C
Posts: 292
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I wouldn't go as big as a 850dp but a 750dp would be good.The 670 could be tuned in also,but would lose in the upper rpms.Vacuum secondary carbs take some work to get right.I have a 3310 750 vac sec I would get rid of also.I has been worked over with a secondary metering block instead of a meter plate.So,the secondary jet can be changed like the primaries.If the carb has a dead spot off idle,the acc pump needs adjustment or a larger squirter be added.First that should be done is set timing.Then adjust idle vacuum,metering block vacuum screws,with a vacuum gauge.After that is set then play with carb adjustments.The acc pump adjustment at WOT should be .015-.020 clearance.
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1964 Impala 468BBC,T350 transbrake,4.30 9",10 point and 10.5 M/T's 1996 F250 4X4 12V Cummins,compound turbo 63mm over 75mm,cam,520cc pump,full billet 4R100 563hp&936ft.lbs w/a bad fuel pump and on a dynojet...just an old hunting truck 
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