Max effort SBE cam selection
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On The Tree
Joined: Jan 2011
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From: Texas Hill Country
Max effort SBE cam selection Well it didnt take long to get my forged shorty going in the garage. My eyes have now turned to pushing the SBE to its limits. Plan on getting on the dyno and adding boost and timing til she starts to bark back then back it off a step and let her eat til she dies an honorable death. Right now were at 618/628 11.4 afr 15* timing on e85 with the turbonetics 78/68 1.15ar. 11# boost at 5000' elevation DA was 8426' while on the rollers.
Ive been contemplating camming the car and was looking at the ljms stg2 but was informed that it may cause backpressure issues with the small turbine. Whats everyones suggestion for a max effort Ls1 sbe cam? Would like to see if i can push the engine above 700whp. If it lets go, it lets go, but would like to make a more legitimate attempt at going over 700 besides just turning the controller to the right, adding fuel, and adding timing.
Ive been contemplating camming the car and was looking at the ljms stg2 but was informed that it may cause backpressure issues with the small turbine. Whats everyones suggestion for a max effort Ls1 sbe cam? Would like to see if i can push the engine above 700whp. If it lets go, it lets go, but would like to make a more legitimate attempt at going over 700 besides just turning the controller to the right, adding fuel, and adding timing.
Thread Starter
On The Tree
Joined: Jan 2011
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From: Texas Hill Country
Im sure it will, but if a cam will help it get over 700 im willing to spend the money. I need another 80-100 hp to light the fuse....hell some say the fuse is lit already at 600.
What cam is in it now?
A "Max effort" cam for a high back pressure setup will be a low duration cam with little overlap. You'd be much better off ditching that dinky turbo in favor of a "big" single, or buying another just like it and running twins.
A "Max effort" cam for a high back pressure setup will be a low duration cam with little overlap. You'd be much better off ditching that dinky turbo in favor of a "big" single, or buying another just like it and running twins.
Thread Starter
On The Tree
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From: Texas Hill Country
Completely SBE right now. Just would like to witness what a stock ls1 is capable of without getting into the crank rods and pistons before swapping out the short block. If a cam swap over the stock stick will help inflate the numbers ill change it. If not ill just start adding boost fuel and timing.
Anyone with any experience with the tc78 wanna chime in? Where did it quit?
Anyone with any experience with the tc78 wanna chime in? Where did it quit?
Thats pretty good power for a stock cam and 11# of boost. I have the same turbo but with a 75mm wheel and 0.96 A/R housing. Hoping I can get close to 800whp on my 5.3 with it. I am running a pretty big cam on it though 230's duration, 600ish lift on a 115+2 LSA. Was spec'd for a 5.7 turbo but I am going to try it on my 5.3 and hope for the best.
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Thread Starter
On The Tree
Joined: Jan 2011
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From: Texas Hill Country
If i can get past 600 with no effort and no timing, you should be able to get to 800 with that 78/75. Id really like to have one of those to begin with. Maybe i wouldnt be so quick to get this next bullet started.
i just picked up an lq4 block and crank a few weeks ago , its at the machine shop. Looking to run up past 1000hp on the next build with a t6 and rect. Port heads.
i just picked up an lq4 block and crank a few weeks ago , its at the machine shop. Looking to run up past 1000hp on the next build with a t6 and rect. Port heads.
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Verdad Gallardo If we are dyno racing, I think Coltboostin dyno'd 850ish hp on a stock long block ls1 with twin 66's. Factory cam and all, so the OEM cam isn't going to hold you back much at those levels IMO. Definitely something to be gained by going a little bigger on the cam. I'd think something small like JFR's triple 12 grind would do really well. Might PM stock48 and see what he'd suggest...
Though for a little more $ you could bolt on a VSracing 88/83 or 76/83mm turbo or a t6 S475...
Though for a little more $ you could bolt on a VSracing 88/83 or 76/83mm turbo or a t6 S475...
A on3 78/75 is cheaper than a cam and will probably make more power than the best cam with your current turbine. Don't know hp numbers but stock 4.8 went pretty fast with a tc76 and so did skinnies.
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From: Ohio
I wouldn't go any bigger than a Triple 12 on your current turbine. That cam should really wake it up. With that being said, you should still be able to make enough power to snap the rods on a stock cam.
And simply 'adding timing' on a stock bottom end is usually what does them in, not power/torque. If you really want to see how far you can stretch it, keep the timing low.
And simply 'adding timing' on a stock bottom end is usually what does them in, not power/torque. If you really want to see how far you can stretch it, keep the timing low.
Thread Starter
On The Tree
Joined: Jan 2011
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From: Texas Hill Country
Think im gonna go the 88/83 route, run reasonable timing;im at 15 now, and start turning it up....see where it goes. Last night i lost the boost line off the wastegate mid pull on the highway. The car was pulling hard, i was watching afr, and all the sudden it felt like i got rearended. I caught the boost gauge at 17#, afr stayed rock steady and it never rattled, or i would probably be posting a different post today, lol
Youll run out of turbine before you hurt the shortblock if the tune is good.
You will absolutely gain power with a cam swap, but its probably not going to make that drastic of a change once you max that turbo out.
You will absolutely gain power with a cam swap, but its probably not going to make that drastic of a change once you max that turbo out.
Thread Starter
On The Tree
Joined: Jan 2011
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From: Texas Hill Country
Think it will go 700/700 on this turbo? Im betting it falls short, im going to say it goes 680/710 with this turbo tilted. Then ill put on the 88/83 t4 and see what happens. I almost hate to even mess with 88/83 t4 as im looking at going t6 s475/480 1.10 when the 6.0 gets finished. May just see how far a tc78 will go....talked to a guy today that was 680/720 on 17# sbe tc78. Backpressure has got to be through the roof and thats gotta be close to being tapped i would think.
you have good valve springs?
Naturally aspirated stock bottom end ls1 vs tc76 with 6 psi. All I did was add turbo with meth injection.
Precision 76 gts 8 psi, 10 psi and 11 psi.
Maxed out tc76
Haha jk
Naturally aspirated stock bottom end ls1 vs tc76 with 6 psi. All I did was add turbo with meth injection.
Precision 76 gts 8 psi, 10 psi and 11 psi.
Maxed out tc76
Haha jk
Last edited by Nitroused383; Jun 30, 2016 at 01:57 AM.