Injectors
Thread Starter
Instructor
Joined: Jul 2010
Posts: 100
Likes: 0
From: Elgin Il.
Injectors
Got a question for all you guru's out there. I have a 2002 ZO6 that I have done a little to. Cold air, mild cam, long tube headers (no cats) Borla stinger exhaust, hardened pushrods, rebuilt rockers, upgraded oil pump new springs. something like that. Last year on the dyno gave me about 440 RWH. This year I am putting on a fast 90 with a 90mm TB. Injectors are stock. My question is. Should I up grade injectors? Why? With What?
I live in Chicago so the car is put up about 5 months out of the year. When it is not it is my daily driver.
I live in Chicago so the car is put up about 5 months out of the year. When it is not it is my daily driver.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
you should be able to log your duty cycles with most any scanner---The problem if you go to a too large of an injector is that the idle and off idle tuning can be a bitch---surging/dying/idle hunting can result---On my '98 with apprx 400 RWHP I still use the stock 28 lb injectors-(same as yours)-My duty cylces at the end of a drag pass go up to 92%--the car still performs well--As long as you let the injectors cool down between runs it's fine--Or on the street don't run at WOT for a long long time without a cool down--
ALSO Just my opinion and experience-- a 90/90 combo is an overkill for a stock cam/heads engine--The cost is pricey--and to me you'd be better off speding the $$ elsewhere--I would get a CAM !!! 1st
My car is an A4 so my RWHP is lower but if my car had a 6 speed it would have smiliar RWHP to yours---
I run an older FAST 78 with a Shaner T-body
You may gain a few RWHP with that set-up BUT only at the higher RPM ranges--from around 6400 on up--And LOSE bottom end HP and most importantly bottom end TQ--- To me it's just not worth the $$$
Melting Slicks
Joined: Jun 2005
Posts: 2,396
Likes: 52
From: Sicamous BC
The Fast 90/90 is an excellent combination 
you will leave power on the table if the manifold is not ported correctly. There are very few I would trust to port it.
Or, the Fast 102 provides excellent results with no additional port work, the down side is a potential fit issue with the 102. That seems to vary car to car.
If you do a little searching C5 & 6 regarding the Fast 90/92 & 102, look for comments by Tony Mamo & Spinmonster. You will find the gains are substantial!
My guess is your injector's are fine, just log them as Bill suggested. If you find you need to change them I have a lightly used set of Red Top SVO's with the correct data for a bargain price.
Just found this over on LS1:
http://ls1tech.com/forums/dynamomete...-only-ls1.html
you will leave power on the table if the manifold is not ported correctly. There are very few I would trust to port it.Or, the Fast 102 provides excellent results with no additional port work, the down side is a potential fit issue with the 102. That seems to vary car to car.
If you do a little searching C5 & 6 regarding the Fast 90/92 & 102, look for comments by Tony Mamo & Spinmonster. You will find the gains are substantial!
My guess is your injector's are fine, just log them as Bill suggested. If you find you need to change them I have a lightly used set of Red Top SVO's with the correct data for a bargain price.
Just found this over on LS1:
http://ls1tech.com/forums/dynamomete...-only-ls1.html
Last edited by CTD; Feb 17, 2012 at 09:07 AM. Reason: added a link
