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2008-2009 Racecraft Mustang For discussion of the 2008-09 Racecraft 420S Mustang. Owners of the 2007-08 "Sleeper GT" can also find help here. |
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#1
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Pulley Swap
I was woundering if anyone could tell me the limit on the amount of psi the 3v block, in the RC, can handle. I've decided to void the warranty and upgrade the pulley on the supercharger. I'm considering around 9-11 psi to try and keep it safe. Any suggestions?
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#2
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Right now I believe we're at around 4-5psi. A 3.8" pulley will bump you about 2-3psi from what I read. I think, but not sure, the 3.4" pulley from Chicane will put you in the 10-11psi range. A guy out here ran his 06 Mustang with a Kenne Bell and ran 10psi all day long. I'm sure the block can handle it, but its not something I would do unless the car was just a weekend car.
Edit: I'm sure you know, but I'll say it anyway. You'll also need a retune. The 3.8" pulley can be retuned by Saleen(although with them out of business I'm not sure). If you go smaller, look into Brenspeed or JDM. |
#3
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Thanks for the advice. I was considering around a 3.2 pulley. But since it is a DD, I'd have to agree with you and go with less psi. Thanks for the advice. I'm a speed junkie and around here Mustangs are targets.
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#4
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ha, so am I. The power I can get out of this mustang for under $1k would cost me 4x that with my VW. Its unreal. I see why people love them so much. You know that, you had a cobra. Let me know what you end up doing.
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#5
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I'll be happy to share. I already have three kills in this car in stock form. 1st K was a S2000 with mods and a turbo. No contest. He was slow of the line. The 2nd was luck. A Subie with mods and 18 psi turbo. I got a car and 1/2 on him and that's all. The 3rd was a Shelby GT-H with Ford Racing mods. I walked pulled away from him as well. I hope thats the last time I'm forced to do that. Sooner or later I'll loose.
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#6
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Mine with the stock tune made 393 to the rear & was a bit lean so if I pully mine Im going to add the GT 500 pumps etc.
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#7
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I was thinking of pushing around 11psi with a 3.2 pulley. Do you think a KB Boost a pump would work as well as the 500 pumps? That way I wouldn't need to go into the tank.
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#8
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Yea, you can do that. JDM recommended not doing the Boost-a-pump since it just ups the voltage but seems like a lot of guys do it. 11psi?! You driving it daily?!
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#9
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Yes it's a daily driver. I was thinking about th KB Boost a Pump due to the fact I'd have some control over the gas milage?
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#10
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Quote:
I think the better question is are you into the boost daily? Talking to JDM or someone as well qualified can give you a free assessment for your driving habits and goals. The beauty of our Superchargers is the internal valving that bypasses boost unless you need it, keeping the engine in a much more conservative place except when you really hammer it.
__________________
Michael '07-0449 S281 SC Coupe - 1 of 1 as optioned |
#11
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I also added the max pulley allowed when my s/c was installed and I am pushing 11psi with about 460hp to the rear wheels. My car is only a weekend driver and good weather driver..........
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#12
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I don't go into boost often, but as I stated earlier my RC is driven daily and I think 11psi would be safe. I average 54 miles roundtrip to work and back (4 times a week) and only about 20miles or so the other 3 days total. The rest of the time is spent in my wifes vehicle. Thanks for the advice and I'll be sure to ask the shop doing the work what they think is best. I might even get Ford to do the the work. The dealership that I purchased the car from is pretty open minded to after market tuning as long as I assume half of any repair issues that might accure.
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#13
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question
just put a stage 3 saleen and stage 4 inlet on my 07 gt.With the 3.4 pulley and 40 degree inlet it made 452 rwhp and 430 torque.Total timing is 19 degress and was dynoed on a dynojet.At idle the sc is noisey( makes a growling sound,not a whine)Does this sound normal.I have nothing to compare it to.Most everyone in my town run roush's or kenny bell.I also went with the boost a pump.Air fuel is at 12.2Tony
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