11.01:1 work with FI?
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11.01:1 work with FI? I have the mods in the sig along with a few other "dress-up" parts here and there, nothing to do with performance. My question is with the set-up, I am going to AFR 225 with a 76cc chamber, -6cc wiseco pistons, 408 4.030 bore, 4.000 stroke, would 7 psi from a supercharger or turbo be ok with this? I am not 100% sure on the CR but 11.01:1 is what it is now with the 66cc heads from AFR. I would assume 10.7 or somewhere in that area. Gas will be 93 octane, timing now is at 18* I think. What would the timing have to do to be safe? And also would a smaller n2o shot be a no-no or what? Thinking of 75-150 to make up for the density loss with the heat or is it even that big of a deal?
I don't know much about S/C or T/C cars, so please...someone help that knows.
Also, which kit??? Procharger, Vortech, STS??? what do you guys think?
I don't know much about S/C or T/C cars, so please...someone help that knows.
Also, which kit??? Procharger, Vortech, STS??? what do you guys think?
If possible get some much larger cc heads. You want to get as much out of the heads as possible so that ya dont take from the meat of the piston if possible. 10.7 is a little high that is for sure but definatly not impossible. You woudl be capable of makin alot more power SAFER if ya go much lower compression. GL mate
John
John
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I think I will go with the -14cc pistons, 76cc heads, cometic gasket, and either STS Turbo or Procharger or Vortech at or around 8-10 psi. Gotta do some reading now about them two. This set-up will take a little while to prepare for. Also, any info on the tuning of a s/c car?
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whichever way you go you're gonna get boost hungry go with lower compression, with a 408 and 8.5-9:1 compression 12-15 lbs on pump gas. i say go with -28cc pistons
that cam will be overkill for a basic fi setup.
tuning is the same as any car, ls1edit or hptuners does the trick.
that cam will be overkill for a basic fi setup.
tuning is the same as any car, ls1edit or hptuners does the trick.
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THanks for the info. You're probably right about the boost hungry part. So i may go with the stock 347 block making it into a 383, -28cc pistons, what kind of cam would you receommend for 12 psi...I read that a 116-117 lsa helps alot but what kind lift and duration? A reverse split? Conventional won't work quite as well huh?
there some people here that have run square cams (TR224) and got good results but you'll make more 4 to 6 degree split.
minimally 114lsa up to 117. Its all about where you want to make your power in the band. I'm gonna put a 224/230 on a 115 in my car. lift anywhere from .580-.600
honestly you don't need a lot of lift with a forced induction car, my cam will be around .588 i believe.
is your car a race car, i see you got a fuel cell.
minimally 114lsa up to 117. Its all about where you want to make your power in the band. I'm gonna put a 224/230 on a 115 in my car. lift anywhere from .580-.600
honestly you don't need a lot of lift with a forced induction car, my cam will be around .588 i believe.
is your car a race car, i see you got a fuel cell.
you need to be more clear, you are currently running 66cc AFR's but want to switch to 76cc, correct?
guestimating deck height and gasket i come up with 11.03 with 66cc. with a 76cc chamber compression drops to 9.9 assuminng everything else remains constant.
guestimating deck height and gasket i come up with 11.03 with 66cc. with a 76cc chamber compression drops to 9.9 assuminng everything else remains constant.
Yeah, I was about to comment on the CR thing, seen No...lol. But doesnt seem replies are reading fully, as well, posted is not providing all the info. You need to do a compression calculator using the end state parts, 76cc heads, gasket thickness, and -cc heads, figure that and then you'll know where you will be at, and can go from there. Might end up being in the "safe" zone using .054" gaskets, maybe thinner. If it is not so much a streetcar, then yes you can use 11:1, but with some serious tuning, monitoring and refreshing, how else would a top fueler run? Lots of compression and blown! Octane will have a whole new meaning after you go power adder.
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you need to be more clear, you are currently running 66cc AFR's but want to switch to 76cc, correct?
guestimating deck height and gasket i come up with 11.03 with 66cc. with a 76cc chamber compression drops to 9.9 assuminng everything else remains constant.
guestimating deck height and gasket i come up with 11.03 with 66cc. with a 76cc chamber compression drops to 9.9 assuminng everything else remains constant.
So I guess the question now is would 9.9:1 with 7-8 lbs of boost be ok? I would say yes since so many have used prochargers and STS remote mount systems with the stock CR.
Yeah, I was about to comment on the CR thing, seen No...lol. But doesnt seem replies are reading fully, as well, posted is not providing all the info. You need to do a compression calculator using the end state parts, 76cc heads, gasket thickness, and -cc heads, figure that and then you'll know where you will be at, and can go from there. Might end up being in the "safe" zone using .054" gaskets, maybe thinner. If it is not so much a streetcar, then yes you can use 11:1, but with some serious tuning, monitoring and refreshing, how else would a top fueler run? Lots of compression and blown! Octane will have a whole new meaning after you go power adder.
With good fuel and/or AI you can certainly run 10 psi on an 11:1 engine. LS6's come with 10.5:1 and I know there are many people running over 10 psi on stock LS6's.
You can certainly do it but running race gas mix, or straight race gas for knock deterent. Ppl shy away from high compression and FI mostly due to streetable factor, like when you have to run a measly 12* total timing, and race gas some dont consider that a street car, others will.
10:1 408ci + 10psi from a power adder can work on pump gas but it would depend on how how the combo ran. After all you can boost a stock 10:1 engine to 9psi with a Vortech aftercooled kit.