5psi with 11.4 compression
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Joined: Jun 2010
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From: Arizona
5psi with 11.4 compression Im running a 383 forged bottom end with heads and cam with 11.4 to 1 compression.. i originally set up the motor for na but came across a p1sc kit that i couldn't pass up. Does any one think this set up will work? I know high compression with boost requires race gas, but i'm sticking with pump gas and running a meth inj. kit...What are your opinions/takes on this set up, how much power will i be looking at after a dyno tune? does anyone think meth inj isn't necessacy? please all opinions are welcome..thanks
Run E85 if you can. Stock LS2's have like 10.8 or 10.9 right? They sell P1SC kits for those at about 7/8 psi if I remember correct. So 5psi shouldn't be an issue. Talk with NicD or Devin at PSR and see what they say.
On The Tree
Joined: Apr 2010
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From: Philly
For starters, it really depends on how much power your making right now on the motor. I also recomend e85. I've read that it has a higher octane rating than pump gas. Plus your engine should live longer. Goodluck with your setup!
E85 is somwhere around 100-105 octane I believe.
From Carcraft Online:
Straight ethanol has an AKI rating of 113-115. E85 is generally rated at between 100 and 105, depending upon the manufacturer. The E85 we tested, supplied by American Ethanol out of Chicago, is rated at 105. E85 is most often blended with 87-octane gasoline, since it is the least expensive. Another advantage to ethanol is that the greater volume of fuel required also tends to reduce inlet air temperatures, where evaporating fuel pulls heat out of the incoming air temperature.
Octane Chart
RON MON R+M/2
Ethanol 129 102 115
Methanol 133 105 119
VP C-16 117 117 117*
VP SB 100 unleaded 106 96 100*
Rockett 100 unleaded 106 96 100**
*These numbers were taken directly from
VP's Technical Bulletin on Fuels.
**From Rockett Racing Brand information
sheet online.
From Carcraft Online:
Straight ethanol has an AKI rating of 113-115. E85 is generally rated at between 100 and 105, depending upon the manufacturer. The E85 we tested, supplied by American Ethanol out of Chicago, is rated at 105. E85 is most often blended with 87-octane gasoline, since it is the least expensive. Another advantage to ethanol is that the greater volume of fuel required also tends to reduce inlet air temperatures, where evaporating fuel pulls heat out of the incoming air temperature.
Octane Chart
RON MON R+M/2
Ethanol 129 102 115
Methanol 133 105 119
VP C-16 117 117 117*
VP SB 100 unleaded 106 96 100*
Rockett 100 unleaded 106 96 100**
*These numbers were taken directly from
VP's Technical Bulletin on Fuels.
**From Rockett Racing Brand information
sheet online.
Im running a 383 forged bottom end with heads and cam with 11.4 to 1 compression.. i originally set up the motor for na but came across a p1sc kit that i couldn't pass up. Does any one think this set up will work? I know high compression with boost requires race gas, but i'm sticking with pump gas and running a meth inj. kit...What are your opinions/takes on this set up, how much power will i be looking at after a dyno tune? does anyone think meth inj isn't necessacy? please all opinions are welcome..thanks
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FWIW until I got my WCCH heads I ran a P1SC-1 at 5psi on 11.3:1 (milled 5.3L truck heads) on a 222/224 cam, stock shortblock. It ran great, 91 octane Cali gas and about 17 degrees of timing.
With meth it should be no big deal as long as you watch the tune carefully.
Rob (Bad30th)
With meth it should be no big deal as long as you watch the tune carefully.
Rob (Bad30th)
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Verdad Gallardo Thread Starter
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Joined: Jun 2010
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From: Arizona
wow thanks for everyones take on this subject, like always i keep getting mixed messages, it really sucks because i can't buy e85 anywhere close to where i live. but wow i really learned alot about e85 and alot from everyone's replies. thanks again and if u are reading this and have an opinion please voice it thanks ls1tech.....i guess i am going to run the meth kit since its already ordered it will ultimitely give me more power and cool air intake tempetures and i am not one to be running my motor on the edge....i am a safe than sorry kinda guy too so the meth makes me feel more comfortable too....
Forget e85 unless you buy it by the drum. I have heard horror storys about inconsistency of blends from different pumps. 100% meth is the way to go for sure. What are the specs of the cam you've got in the 383 right now?
I agree. The only thing worse than 4 psi is no psi. LOL. To be honest, I wouldn't even bother with the expense or aggravation unless I intended to run 10+. Otherwise it's just a poor return on investment. For 4 psi, I'd pull 2* from whatever you are running for timing now. This is assuming that the meth will bring your charge temps down to near ambient.
Also, the 104 octane rating for E85 is misleading. It's resistance to detonation is atleast equivalent to C16 if not more.
Also, the 104 octane rating for E85 is misleading. It's resistance to detonation is atleast equivalent to C16 if not more.
That is all they are too...storys. Yes it can be inconsistent but it takes about one minute to check the blend.
You'll have no problem at all. You can probably get by with 7 to 8 psi, which will bring the boost in sooner, plus you'll make a lot more power. Bob
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A turbo motor typically needs a little less compression, but we made 7 psi on an 11.0/1 motor with an APS turbo without any problems at the old shop. Bob
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