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Old 03-03-2015, 10:03 PM   #1
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Whipple=boost

Anyone run a 3.125 pulley on stock internals?
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Old 03-09-2015, 10:21 AM   #2
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we have some guys running that up here, but Albuquerque is much higher altitude. we can get away with it. i would be very careful of running that at sea level. could be dangerous.
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Old 03-09-2015, 02:07 PM   #3
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im running 16 psi off a procharger on stock internals for over a year.... no problems
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Old 03-10-2015, 10:01 AM   #4
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centi are much more forgiving on a motor than a twin screw. 16 psi on a roots or twin screw on a stock motor will not hold up very long.
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Old 03-10-2015, 07:08 PM   #5
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Well I was running 13psi on my whipple for a year before that. No probs
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Old 03-10-2015, 09:50 PM   #6
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Like the comments. I've read threw here a bunch and haven't seen many peoples stories about trashing the engine from too much boost. Is psi not the same as other psi no matter where it's made from? I figure good meth and a good tune with good fuel presure will be just fine. I'm going to try and squeeze 15 psi out of mine and I'll let yall know if it goes up in smoke. But please keep the comments rolling. I like this place
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Old 03-10-2015, 09:53 PM   #7
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Quote:
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Well I was running 13psi on my whipple for a year before that. No probs
So two years all that pressure and still going strong. Nice!
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Old 04-05-2015, 09:47 PM   #8
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I will find out soon how well the stock internals take to some whipple boost. mine is sitting at g-force awaiting its tune and other supporting mods.
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Old 04-06-2015, 09:20 AM   #9
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I have a 3.2 pulley on a twin screw
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Old 04-06-2015, 09:42 AM   #10
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Its a roots, but pretty close. Even though you are only at 8 psi, you are making a lot of power.

Supposedly its the power that destroys an engine, not the psi. High hp (even more needed to run blower) and high intake temp.

OP, as long as you get good gas and a good tune, it will probably hold for a while, as you have probably read. I would data log and be careful if you take it on a long trip. Use some decent octane booster if you are using unfamiliar gas stations.

What hp are u estimating? Also, do you track the car?
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Old 04-08-2015, 09:06 AM   #11
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i'm running a 4 inch pulley with my whipple, and its hitting 9lbs of boost. Started with a 3.875 and it was hitting 10.1lbs. I backed it off to the 4" just for a little more safety.
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Old 04-17-2015, 10:01 AM   #12
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Quote:
Originally Posted by z3R0fo01 View Post
Its a roots, but pretty close. Even though you are only at 8 psi, you are making a lot of power.

Supposedly its the power that destroys an engine, not the psi. High hp (even more needed to run blower) and high intake temp.

OP, as long as you get good gas and a good tune, it will probably hold for a while, as you have probably read. I would data log and be careful if you take it on a long trip. Use some decent octane booster if you are using unfamiliar gas stations.

What hp are u estimating? Also, do you track the car?
not sure what HP i will get but i am going alky meth, nw 102 TB, twin pumps. Im at 681 now with 8psi and stock tb stock pump with bap. Goal is 13-15 psi and see what it does. I have since decided to go with overdrive crank pulley and 3.5 whipple pulley. I do track the car occasionally and it is not a daily driver.
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Old 04-18-2015, 12:16 PM   #13
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Quote:
Originally Posted by williamp78 View Post
not sure what HP i will get but i am going alky meth, nw 102 TB, twin pumps. Im at 681 now with 8psi and stock tb stock pump with bap. Goal is 13-15 psi and see what it does. I have since decided to go with overdrive crank pulley and 3.5 whipple pulley. I do track the car occasionally and it is not a daily driver.
Im assuming that 681 is to the crank?
Are you running a cam?
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Old 04-18-2015, 01:36 PM   #14
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I know of a stock ls3 (cam and spring only)that has a f1-x procharger on 23psi. Made 9 pulls over 1k this week on the dyno. Made 1034whp. With the proper fuel and tuning the ls3 is a beast of a motor.
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