More power forged ls2 /w rear turbo
01-22-2012, 05:40 PM
#1
Teching In
Thread Starter
iTrader: (2)
Join Date: May 2006
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
More power forged ls2 /w rear turbo So last year my stock LS2 died. I am now running a forged Ls2 setup with a 9.5:1CR on stock 243 heads and LS9 cam and 50/50 meth. I'm running STS rear mount setup with a Turbonetics TC76 turbo. After I got the new motor in and I took it in for tuning I cam back with great disapointment. 373RWHP/400RWTQ @ 5PSI. Now that I have about 12K on the motor I want to get this thing running better. It madd 422RWHP/432RWTQ @ 5PSI with the stock LS2 motor and a 60mm turbo.
So I'm wondering where I went wrong. I was planning to run 13-15PSI on this motor, but with the low numbers I'm wonder if I should make some changes. Is the CR too low? Should I mill the 243 heads down to get the CR up?
So I'm wondering where I went wrong. I was planning to run 13-15PSI on this motor, but with the low numbers I'm wonder if I should make some changes. Is the CR too low? Should I mill the 243 heads down to get the CR up?
01-22-2012, 07:35 PM
#3
Why only 5 psi on a built motor?
I had a garrett GT76 .96 A/R on my STS and put down 500 RWHP @ 6 psi and 580 @ 9psi IATs were around 90 and the car had 19 degrees total timing this was on a Dyno Jet. My motor was a built LQ9 9.5:1 compression also had a comp turbo cam 540/540 224/220 with a 117 lobe sep angle.
As stated above check your plug gap, I use to gap mine at 35. Also make sure that you are running a colder plug too.
What is your fuel system setup, injector size, pump, rails, ect.
I had a garrett GT76 .96 A/R on my STS and put down 500 RWHP @ 6 psi and 580 @ 9psi IATs were around 90 and the car had 19 degrees total timing this was on a Dyno Jet. My motor was a built LQ9 9.5:1 compression also had a comp turbo cam 540/540 224/220 with a 117 lobe sep angle.
As stated above check your plug gap, I use to gap mine at 35. Also make sure that you are running a colder plug too.
What is your fuel system setup, injector size, pump, rails, ect.
01-24-2012, 11:00 AM
#6
TECH Resident
iTrader: (17)
Join Date: Sep 2004
Location: NC - Charlotte area
Posts: 3,747
Likes: 0
Received 0 Likes
on
0 Posts
are you running out of fuel? Certainly at 5psi or even 8psi you aren't with that pump...
you should be running a tr6 around a gap of 0.035 or 0.030 at minimum.
my setup was a 5.7L LS1 and I made 650 and 680 on 15 lbs. Now due to my fault I'm on a LS2 & LS6 head setup...so essentially a stock ls2 with my TC76 and I know it will make 50+ more hp and tq throughout the rpm band. Sounds like somethings funny
bump the boost up to 8lbs or even 10 and see what it makes....5psi is ridiculously low for what you have. I was also running 16 degrees of timing @ around 11.8 AFR
you should be running a tr6 around a gap of 0.035 or 0.030 at minimum.
my setup was a 5.7L LS1 and I made 650 and 680 on 15 lbs. Now due to my fault I'm on a LS2 & LS6 head setup...so essentially a stock ls2 with my TC76 and I know it will make 50+ more hp and tq throughout the rpm band. Sounds like somethings funny
bump the boost up to 8lbs or even 10 and see what it makes....5psi is ridiculously low for what you have. I was also running 16 degrees of timing @ around 11.8 AFR
Trending Topics
01-26-2012, 04:44 AM
#8
Launching!
Join Date: Aug 2006
Location: spfld,il
Posts: 243
Likes: 0
Received 0 Likes
on
0 Posts
Take it to a different shop and get a better tunehave you checked the inter cooler for trash from the last setup that grenaded, and you will need more pump/fuel lines to turn up the post past 8 psi
