Larger Fuel Injectors
Thread Starter
Pro
Joined: Aug 2004
Posts: 575
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From: Richmond Hill Ontario
Larger Fuel Injectors
At what point would larger than stock injectors be recommended when doing modifications on an LS1? I'm currently running Z06 ported heads, hurricane cold air intake system, Bassani headers and hi-flow cats with X-pipe and Z06 Ti exhaust, comp cam with just slight larger specs and lift than the stock 2002-04 Z06 bumpstick, stock MAF & TB. While logging data with my tuning program I've noticed that the duty cycle for the injectors hits 100% under full throttle high rpm operation and was told that anything more than 80% means you need bigger injectors. If thats true, how much bigger than stock would I be looking at?
Thanks
Thanks
Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
At what point would larger than stock injectors be recommended when doing modifications on an LS1? I'm currently running Z06 ported heads, hurricane cold air intake system, Bassani headers and hi-flow cats with X-pipe and Z06 Ti exhaust, comp cam with just slight larger specs and lift than the stock 2002-04 Z06 bumpstick, stock MAF & TB. While logging data with my tuning program I've noticed that the duty cycle for the injectors hits 100% under full throttle high rpm operation and was told that anything more than 80% means you need bigger injectors. If thats true, how much bigger than stock would I be looking at?
Thanks
Thanks
100% isnt terrible... if you are planning on leaving it like that it should be fine... but any other mod will require bigger injectors.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
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From: CA.
St. Jude Donor '13-'14-'15
Tech Contributor
Joined: Sep 2005
Posts: 1,731
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From: New Market AL
I was in the same boat as you with the upgrade to my '99 causing me to see 102% duty cycle. I went ahead and upgraded to 30# SVO injectors just before getting a dyno tune. Now I top out in the high 70% range. Time to bring on some more power. Here is a comparison picture of the injectors.
Thread Starter
Pro
Joined: Aug 2004
Posts: 575
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From: Richmond Hill Ontario
Thanks for your replies. I've only taken my car to track for 1/4 blasts, no road racing. Didn't want to think I was leaving any horsepower on the table or getting into any dangerous engine territory. I'm going to put the car on the dyno this spring when the weather gets better. Anyone care to hazard a guess as to what my combo should make?
Le Mans Master
Joined: Jul 2005
Posts: 7,405
Likes: 353
From: New Castle Del.
St. Jude Donor '09
Thanks for your replies. I've only taken my car to track for 1/4 blasts, no road racing. Didn't want to think I was leaving any horsepower on the table or getting into any dangerous engine territory. I'm going to put the car on the dyno this spring when the weather gets better. Anyone care to hazard a guess as to what my combo should make?
What are the exact cam specs and i shoudl be able to give youa good guess.... also what kind of dyno?
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Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
if you need the 30's We have them here
http://fuelinjectorconnection.com/sh...od&productId=5
Flow Matched
http://fuelinjectorconnection.com/sh...od&productId=5
Flow Matched
Last edited by FICINJECTORS; Mar 23, 2008 at 01:03 AM.
Race Director
Joined: Jul 2007
Posts: 10,961
Likes: 2,643
From: Texas Hill Country
28 lbers are good to 450-475 RWHP. 30s should take you to 500. I was just starting to max my stockers at 465ish, I think. I am running 38s now and will be looking for 550 RWHP next time I hit the dyno. it depends on the tune also. if you are running rich then they will not take you as far.
Thread Starter
Pro
Joined: Aug 2004
Posts: 575
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From: Richmond Hill Ontario
Thanks