stock LS boost?
08-29-2007, 11:38 AM
#41
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Re: stock LS boost?
If you set it up right, You can run a FMU setup to about 230whp on stock injectors, with addition of a Walbro255 HP pump. Boost pressure just depends on the efficiency of your setup. I'd have to say 8psi is the most Id run on 93oct. with FMU. With race gas, you can run maybe around 250whp because you'll be less prone to knock and your setup will still run safely.
On my setups years ago, I used to run 2/10 ratio of 112oct/93oct.
On 8psi my AFR's stayed 12:1 & richer til revlimit.
On 10psi my AFR's climed to 13:1 towards the last 300-400 rpm.
I had this setup for 2 years and ran 12.2 @ 110 in a full interior EG. And it made 242whp @ 8-9psi. at performance autosports.
The setup never failed, I swapped in Rods/Pistons/Injectors/Uberdata, re tuned and daily drove it for another year on 20psi with pump gas and 26psi with 116oct.
Setup went 11.3 @ 120 missing 4th and 5th gear. Ran 6.9@100 in the 1/8th.
All on the same engine....
Have fun with it, LS's are fun motors to boost and very durable. Just setup it right for however you plan to do it.
-----------------------------------
To the guy above:
This setup was making about 450whp on 440cc injectors.
85psi base fuel pressure
111psi peak fuel pressure.
60trim T3/T04E
On my setups years ago, I used to run 2/10 ratio of 112oct/93oct.
On 8psi my AFR's stayed 12:1 & richer til revlimit.
On 10psi my AFR's climed to 13:1 towards the last 300-400 rpm.
I had this setup for 2 years and ran 12.2 @ 110 in a full interior EG. And it made 242whp @ 8-9psi. at performance autosports.
The setup never failed, I swapped in Rods/Pistons/Injectors/Uberdata, re tuned and daily drove it for another year on 20psi with pump gas and 26psi with 116oct.
Setup went 11.3 @ 120 missing 4th and 5th gear. Ran 6.9@100 in the 1/8th.
All on the same engine....
Have fun with it, LS's are fun motors to boost and very durable. Just setup it right for however you plan to do it.
-----------------------------------
To the guy above:
This setup was making about 450whp on 440cc injectors.
85psi base fuel pressure
111psi peak fuel pressure.
60trim T3/T04E
Thank you. That information is very useful!
It not only gives reference to boost levels, which are rather irrelevant, because of variations in turbo's, but to the actual turbo used, the "basic" tune needed, etc. This keeps people from going out and blowing up their Honda cause they throw a 60 trim T3/T04E on the car, and push 10 psi, cause someone said it was safe on stock injectors, when they only have 40 psi of fuel pressure, etc....
That's the point I was trying to get across, and I'm appreciative that you've posted the information you have!
Last edited by BAD4DR; 08-29-2007 at 12:09 PM.
12-23-2008, 05:21 AM
#42
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Re: stock LS boost?
man on stock injectors on stock ls on fmu 6psi is the most tuned 8psi is the most and if u get bigger injectors like 450s or 550s and tuned u can get up to 12 psi safely. So boost ur car man. I KNOW BECAUSE IVE JUST HAD STOCK BOOSTED LS AND NOW BIGGER INJECTORS AND S200 IM TUNING ON, SO I WOULD KNOW!
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