Rambino

Any suggestions on whether the hard pipe kit from Huntley with their monster blow off valve.. or the hard pipe kit from Speedforce with the optional Godzilla or Greddy Blow off valves. Which is better. Huntley is 2.25" Im thinkin take speedforce 2.5" Any power loss from this if i run it on stock turbo, and what are the gains and losses between those three blow off valves. ??

Luke

Sean951 made my pipes. They are beautiful and fit great

SamGrant951

is that car mass air equipped yet?

Luke

[quote]Originally posted by SamGrant951:
<strong>is that car mass air equipped yet? </strong><hr></blockquote>

sunday, SUNDAY, sunday..........hopefully



BTW. A larger Diameter IC pipe isn't neccessarily the better pipe.

"There is probably a magic number that airflow velocity in a tube should not excede, for reasons of rapidly increasing drag and consequent flow losses. I suspect this number is around mach .4, or about 450 ft/sec, since drag, and therefore flow loss, increases significantly after this. Tube size can easily be checked by calculating the maximum airflow attainable, dividing by the area of the tube in square feet, and dividing again by 60 to convert to feet per second. An approximate calue for maximum airflow can be obtained by multiplying the desired bhp by 1.5

rule : A large tube is not necissarily better than a small tube

"

-Corky Bell the Bible (maximum boost)

toddk911

Luke,

Could Sean951 make a CAT bypass? <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

Luke

IDK, he sounds like a really busy guy


ceviston2@comcast.net

TurboTim

We also offer 2.25" pipes. As Luke mentioned, bigger is not neccessarily better. However, we have only seen improvements in boost response with either size pipes. We also offer our pipes in 6061 aluminum in 2.25" or 2.5". aluminum dissipates heat much better then stainless. I dont think anybody else offer pipes like ours in aluminum(bseides Kokeln which are entirely different). We also cut non-slip grooves into our pipes with a lathe. These will eliminate hoses blowing off like you experience with the stock or other aftermarket pipes.

Luke

[quote]Originally posted by TurboTim:
<strong>We also offer 2.25" pipes. </strong><hr></blockquote>


Unfortunately, in this case, to obtain that mach .4 velocity, we would need a 2.9" pipe, unless my calculations are off?!?

We have clearance issues though

btw, that's for a 350 hp crank car.

Toolmaster

All -

No matter whom you end up going with, insure that you tell them endlessly that you're running this on a 944 Turbo, and you'll need the STIFF spring for the blowoff valve.

Our cars are designed to (on the stack valve) allow air to flow through the valve back into the J boot. The bigger valves will typically vent to athmosphere, meaning that with a soft spring - you've just created a leak at idle that will allow unfiltered air into the intake! Not good...

The stiffer spring will keep the valves closed at idle, and will only open at higher manifold vacuum pressures, preventing air in at idle yet allowing air out during shifts.

HTH!

Luke

From my understanding, you can't change the spring/pistons in the oe's or 993's, so you're recommending the forge? or what <img src="confused.gif" border="0">

Toolmaster

Luke -

You're totally correct - you can't change the piston/spring combination on the stock valve or the 993 valve. Those two valves however vent back into the J-boot so at idle, the air has a place to go back into the engine meaning that the metered air that in an aftermarket valve that would normally blow off to atmosphere is being used by the engine. (Not emough coffee yet today - hope I'm understandable.)

The problem when you go with the Huntley huge valve, or the Turbonetics valve from SFR (I hate the Godzilla term personally...) is that these valves are designed to vent to atmosphere meaning that the metered air leaves the engine effecting driveability. The DME doesn't know that this air that it thought was going into the engine isn't actually getting there. If you go with a stiffer spring in the aftermarket valves, then you prevent the issue by preventing the aftermarket valve from opening at idle.

Hope that makes sense... I'm getting more coffee now!

TurboTim

If you use the Godzilla valve on a stock car with a mass-flow and it is allowed to be vented back into the intake(just like stock) it works the same as the little tiny OEM valve.In this case you want to use the spring that comes with it from the manufacturer.Now if you want to vent it directly to the atmosphere then you will have to use the stiff spring like Jay said.

Luke

godzilla sounds really "ricey"

Huntley Racing

The use of any pipe size over 2.25" is a drop in performance because the stock intercooler size is 2.25" and any larger will cause a pressure drop and additional turbulance going from the larger size back down again. HR is the only company which makes the reducer before the throttle body a part of the pipe to keep restriction and turbulance as low as possible. I have enclosed a photo.

Luke

[quote]Originally posted by Huntley Racing:
<strong>The use of any pipe size over 2.25" is a drop in performance </strong><hr></blockquote>

The id on the intake man. inlet is 2.5". So after the intercooler, I dont see why you couldn't use a 2.5" pipe?!? and lower the back pressure. I dont think it would cause that much of a loss in velocity?

Would 2.5" tanks fit on the oe intercooler core?