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Thread: Heads, Cam and Injectors?
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11-08-2008, 02:08 AM #1
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- Laurel, Maryland
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2000 Grand Prix GTP- 2000 Trans Am WS6 M6
Heads, Cam and Injectors?
Stock LS1 injectors are 28#, correct?
With a 224R or 228R cam (haven't decided which one yet) and Ported 5.3L Heads, should I upgrade my injectors too?
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11-08-2008, 03:25 PM #2
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- Oct 2007
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- NC
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SOM- 1998 T.A.
00 are 26.5 #er's but you are fine.
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11-10-2008, 07:26 AM #3
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11-10-2008, 06:53 PM #4
if you have a program that lets you check your injector duty cycle do so. if they get up to 80-85% duty cycle you should get larger ones
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11-10-2008, 07:20 PM #5
how about just cam no heads? which programs can check the duty cycle of the injectors? can dealers do that?
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11-10-2008, 07:24 PM #6
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11-11-2008, 06:02 AM #7
dude im max out my stockers and only puting 341hp to the wheels give or take a few from last dyno more likey give but im am doing a set of 5.3 heads ported and 2.055 valves and im going with 39-42 if i can get a set cheep. http://www.rceng.com/technical.aspx use this site works well and can tell u wich injectors ur going to need
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11-11-2008, 08:26 AM #8
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- Dec 2005
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- Laurel, Maryland
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2000 Grand Prix GTP- 2000 Trans Am WS6 M6
Since I'm not completely sure how much hp I will be putting down with this setup, is it ok to get larger injectors (like 42s) and just have them run at like 70% duty cycle?
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11-11-2008, 09:40 AM #9
the injectors in your 2000 will support (conservatively) about 350 wheel at 80% duty cycle-which is completely within reliability range (i used a conservative .5 BSFC variable for all who may criticize my math). with that cam i'd say you will still be fine. i ran my stockers to the ground at about 95% duty cycle and over 400 wheel.
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11-11-2008, 09:49 AM #10
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11-11-2008, 02:17 PM #11
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11-12-2008, 05:16 AM #12
- Join Date
- Oct 2007
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- NC
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SOM- 1998 T.A.
You hear so many different opinions on this but the 80% rule is correct. I made 417rwhp/383tq. on STOCK injectors so take that for what is worth. Not sure of my Duty Cycle but my tuner said I was OK.
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