right size injectors
03-20-2007, 03:52 PM
#1
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Join Date: Oct 2006
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Posts: 127
right size injectors
i am building a new motor for my 97 gt and i already have full bolt ons for it, and i am orderin a long block ( 302 ci with pi heads) but iam not sure wat size injectors i will need. this summer i will be gettin a prochargerand the kit comes with 80lbs injectors but i dont think the stock ones will hold till then
03-20-2007, 04:52 PM
#3
5th Gear Member
Join Date: Apr 2006
Posts: 3,625
RE: right size injectors
injectors supply 16hp for every 1lb, so 19lb injectors will support a system up to 304hp. If your going stroker motor and have maf and tuning capabilities with PI heads I would get atleast th pink toppers(21lbs) but more or less shoot for the 24lb'ers. You'll be kicking out close to 350hp at the flywheel with Lt's, cams, bolt-ons and tune!
03-20-2007, 05:26 PM
#6
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Join Date: Nov 2004
Location: Tennessee
Posts: 7,797
RE: right size injectors
ORIGINAL: Quicktime_GT
Will going to bigger injectors make anymore power by itself?
Will going to bigger injectors make anymore power by itself?
03-20-2007, 11:30 PM
#7
5th Gear Member
Join Date: Dec 2005
Location: Kentucky
Posts: 2,406
RE: right size injectors
ORIGINAL: ZW99GT
Nope. You have to get them calibrated to your MAF. So it runs the exact same amount of fuel as the smaller injectors. But they dont have to work as hard, and of course, they will flow more if you need them too. (FI)
ORIGINAL: Quicktime_GT
Will going to bigger injectors make anymore power by itself?
Will going to bigger injectors make anymore power by itself?
How about a matched maf and injectors... if a smaller size injector can handle the power level you're at, will the matched set help at all? I guess I am seeing this wrong, i'm thinking more like a 650 or 750 carb
03-20-2007, 11:39 PM
#8
6th Gear Member
Join Date: Nov 2004
Location: Tennessee
Posts: 7,797
RE: right size injectors
ORIGINAL: Quicktime_GT
How about a matched maf and injectors... if a smaller size injector can handle the power level you're at, will the matched set help at all? I guess I am seeing this wrong, i'm thinking more like a 650 or 750 carb
ORIGINAL: ZW99GT
Nope. You have to get them calibrated to your MAF. So it runs the exact same amount of fuel as the smaller injectors. But they dont have to work as hard, and of course, they will flow more if you need them too. (FI)
ORIGINAL: Quicktime_GT
Will going to bigger injectors make anymore power by itself?
Will going to bigger injectors make anymore power by itself?
How about a matched maf and injectors... if a smaller size injector can handle the power level you're at, will the matched set help at all? I guess I am seeing this wrong, i'm thinking more like a 650 or 750 carb
03-20-2007, 11:44 PM
#9
5th Gear Member
Join Date: Dec 2005
Location: Kentucky
Posts: 2,406
RE: right size injectors
[/quote]
I'm no specialst. IF the smaller injectors will handle the power. Then there is NO reason to switch
[/quote]
Hmm... I understand.. There are some local people who swapped to 24 lbers.. I told them at the time there was no need in it unless they were @ 300+ rwhp but they saw it differently
03-21-2007, 12:34 AM
#10
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Join Date: Jul 2005
Location: Georgia
Posts: 2,387
RE: right size injectors
You really don't supply us with enough info. What is the compression ratio? Assuming a stock (or lower?) ratio, with full bolt ons, I agree 24# are probably the best. As for matching them to your maf, that is a must. You can drop in 24# on a MAF tuned for 19#, but you'll be washing the cylinders and wasting fuel I believe, as the computer still thinks the 19# are there. You can buy calibrated 85mm or 95mm MAFs on ebay for about $280. You simply tell them which size and what injector you're planning to run, and they calibrate prior to shipping. I would provide a link, but I can't look at ebay from this network.
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