guys,

i am seriously contemplating this.

i have a 408 all forged internals bla bla. car is set up for spray.

i am running 11.5 to 1 compression. my question i am getting an f1-r blower setup. WHO on here is actually lrunning this compression ratio or higher and is on boost? not to be ignorant but i don't wanna hear lower compression ratio etc.. don't wanna hear change this or that.

just wanna know who does it, what kind of gas, meth kit? how much boost, how much power!..

i have read all the threads on this forum but i haven't seen many people actually doing it, only people contemplating it.

 

I've done it.Depends on the Cam specs on how much boost will be safe.

A F1R is too big for that comp unless you run C-16 all the time and change the Cam.I D1 or F1-C would be alot better.

 

The higher compression will make more power, that's a fact. The problem is it's much less forgiving. I was originally wanted to run high compression with my set-up but after I started spending all this money, I pussed out. If you have a very good tuner and go in it knowing it's a little more risky, I think you could have a really impressive set-up. The only thing is, how long will it last? I'd like to here more from the guys that have done it as well.

 

correct me if im wrong but dont the F-series blowers only do high boost (15+ psi) i believe they run into serious belt slip issues when trying to overdrive them to get low boost levels.

if your willing to run c-16 all the time and have meth for when it knocks then go for it. i personally like the feel of a high compression low boost car compared to a low compression high boost car for street driving since it "feels" strong all through the power band instead of peaky. if your going to do high boost and high compression you'll probably have to run alot less timing then if you did low compression/ high boost or high compression/ low boost but you already know that.
my first subaru setup was a 2.5l with 10.5 to 1 at 5psi and felt much stronger than the 9.2 to 1 2.2L at 9psi but the 2.5 done blown up and the 2.2L took it like nothing so there must be something to it....

 

I am in the same situation. I went ~ 11.25:1 and now want to add a supercharger. I was going to change stuff, but I think I am going to go with it. I went with a D1 on a 427 so I will not have near the boost potential as you

 

im going to be running 12.5 compression with the ms4 cam, twin turbos, about 7-10psi on c16 on my impala. the ls7s which are i believe 11.5 can run 10psi on 91 im sure i can boost more but i want it to last a little while longer.

 

I'm running about 11.5:1 I believe... I had no real plans to go FI, so I had my AFR's milled down to 60cc. I'm on a stock bottom end w/ a F1-C. I found the biggest blower pulley I could (5 1/4") but I'm still making 9.5 pounds. The car drinks methanol like water, I've used 15 gallons since March

Frost (tunedbyfrost.com) is local to me and happens to be a pretty good friend, I hate patting his ego but he IS one of the best, and I contribute the fact that I'm still running around on this setup to his skills/knowledge.

I do not plan on using this setup long, early next year I plan on going low compression w/ forged internals (probably iron block as well)

 

i'm not sure which blower i'm going to go with. if i do go with a blower, it has to make in upwards of 750 rwhp. im at 500 rwhp n/a

 

If your at 500rwhp already, all you need is a D1 and around 10-15psi. That should get you 750rwhp no problem. I'm betting it wouldn't last long but who knows. I went the low compression(8.5) route but to make big power it gets risky either way cause now I'm over 20psi and I have no idea how long that will last either.

 

High compression guys could also look into swapping out their 58-64 cc heads and slapping on some 68-72 cc ones.

 

I ran 10.5:1 and 9lbs of boost (at the manifold) on my 383 LT1 until about a month ago. Then the blower gave out. Run reasonable levels of boost, tune the engine carefully for the boost, and don't be shy about taking out timing as the boost increases.

 

No, you can run lower boost levels with an F series blower. You would end up using a larger pulley on the head unit to slow it down, which would give better belt wrap. The better belt wrap creates less of a chance of belt slippage, not more.

The dyno graph below is from an LS2/402, with an ProCharger F-1A at 12.4 psi of boost. Bob

 

My comp is around 11.5:1 warhawk 403 ci et ls7 heads, all the best running gear, runing vortec ysi max boost is 20-22 making 1100 rwhp , no probs . you need to run the best fuel though. some times runing higher comp creates greater cylinder temps which can cause spark issues .

 

I have a 10:5:1 comp and am running 10lbs with no problem for over a year now

 

thats pretty impressive. i would looove to do something like that what kind of gas are you talking c16?

 

I have two tunes one for street which consists off restricting supercharger intake , 60 lb injectors fuel is best pump gas available. Max power is 1000cc low imp injectors with driver box and c16 or vp 109 , fuel selection is an important part so is your tune .

 

someone tried telling you to run c16 all the time if you went with this setup, but personally, most FI guys around here go E85 as it is a very cheap alternative to race fuel. 105 octane i believe and here, its 70 cents cheaper than 93. more octane means more forgiving to boost, compression, etc. i know you didnt wanna change anything, but if you get a blower, youll obviously need a new tune, so maybe make that an E85 tune while youre at it. 10% power gain as well as that added octane, and cheaper than any fuel out there (race or normal, or diesel ).


oh and i might add this, if you arent dead set on a blower, a turbo might be more up your alley. a boost controller would allow you to turn the boost way down when not racing, and when you are crank it up to what you want. might just preserve the motor even more.

 

The E85 sounds good... but am I wrong, or don't you need to change out all your seals and such to run E85, same as for an alcohol race fuel engine?

 

How about a methanol injection system with 2 big #20 nozzles with the IAT sensor in series behind the nozzles so that you can yank tons of timing if you lose the meth for any reason? I'm 9.55:1 compression, but running 18psi on pump gas and 19 degrees of timing with room to spare. Not a bad way to go IMHO.

 

E85 is ethanol. Alcohol race fuel is methanol which is much more corrosive than ethanol. Ethanol is corrosive to some rubber parts, but Most newer vehicles were designed to tolerate ethanol extended fuels (10% Ethanol)

Ethanol like meth injection also cools the intake charge as it enters the airstream. Ethanol also gives you more torque, as previously stated, due to greater expansion of gases. More gases spools turbos quicker but that is not relevant if youre running a blower.