Question for LS-6 builders/tuners
12-29-2008, 03:49 PM
#1
Instructor
Thread Starter
Member Since: Jul 2004
Location: kennett square PA
Posts: 193
Likes: 0
Received 0 Likes
on
0 Posts
Question for LS-6 builders/tuners
My LS-6 features AFR 205' heads, a G5X3 cam. and LG long tubes. I do 10-12 track events a year. I'm running stock throttle body, manifold, and injectors. Would I benefit from going to larger injectors?? If so what size would be best? Would a ported 90mm TB add any significant power?
12-29-2008, 04:27 PM
#2
Drifting
I would think you are putting out close to 440/450 RWHP depending on compression ratio. With stock LS6 (28.8 lb) injectors you are definitely running 100% plus duty cycle at WOT.
I would say 30 lb Ford SVO (comparable to 36 lb. GM) injectors or 39 lb LS3 injectors. 42 lbs would also not be a bad choice.
Some testing from guys on LS1 tech forum indicated a pickup of both mid range and top end with 90mm throttle body and LS6 intake. If you want it ported I would send it to Tony Mamo at AFR.
I would say 30 lb Ford SVO (comparable to 36 lb. GM) injectors or 39 lb LS3 injectors. 42 lbs would also not be a bad choice.
Some testing from guys on LS1 tech forum indicated a pickup of both mid range and top end with 90mm throttle body and LS6 intake. If you want it ported I would send it to Tony Mamo at AFR.
12-30-2008, 08:43 AM
#3
Safety Car
Member Since: May 2006
Location: Northern Virginia
Posts: 3,799
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08
You might benefit by moving up to 36 pound injectors.
Here is a link to a site that explains how to size injectors and provides a worksheet for making calculations. It uses crank HP not rwhp.
http://www.rceng.com/technical.aspx
Here is a link to a site that explains how to size injectors and provides a worksheet for making calculations. It uses crank HP not rwhp.
http://www.rceng.com/technical.aspx
12-31-2008, 05:36 PM
#4
Melting Slicks
Get some injectors and a good tune before you blow that thing up!
As for the intake/tb, when I got my car it had a ported LS6 mani and ported stock TB. It's a stock displacement build w/ mildly ported heads (not as nice as your AFRs) and a smallish cam (224/230, .591/.591, 113). I did 428RWHP after a good tune. I put a FAST 90mm mani and a 90mm TB on it and picked up 14RWHP (got to 442) but also some torque (I think ~10 at peak) and power was up across the entire pull. Some ppl told me I'd lose low-end torque but I did not.
-TJ
As for the intake/tb, when I got my car it had a ported LS6 mani and ported stock TB. It's a stock displacement build w/ mildly ported heads (not as nice as your AFRs) and a smallish cam (224/230, .591/.591, 113). I did 428RWHP after a good tune. I put a FAST 90mm mani and a 90mm TB on it and picked up 14RWHP (got to 442) but also some torque (I think ~10 at peak) and power was up across the entire pull. Some ppl told me I'd lose low-end torque but I did not.
-TJ
01-01-2009, 01:11 PM
#5
Instructor
Thread Starter
Member Since: Jul 2004
Location: kennett square PA
Posts: 193
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the info and the website. I think I will upsize the injectors this winter. My last dyno sheet showed 465 RWHP on Phoenix's Dynotech on a 88 degree day.
01-01-2009, 05:36 PM
#6
Le Mans Master
Member Since: Sep 2002
Location: Oakville Ontario,Canada
Posts: 5,187
Likes: 0
Received 5 Likes
on
3 Posts
I have a very similar set up to yours and I went to 36lb injectors and all is good once again in duty cycle world, just make sure they are flow tested. Fast 92/90 would probably get you another 10rwhp
Last edited by GettReal; 01-01-2009 at 05:40 PM.
