Hey guys, I've had an Old-School Greddy IC core laying around for awhile now, and I finally bought some used aluminum piping to put together a kit. 3 of the pieces are from the original, yet the rest is not. I measured the Greddy pipes, and I believe they are 2.25" and the rest of the pipes are 2.5". Now, I was just curious as to the potential pressure drop from the air moving from smaller to larger to smaller diameter piping. Would it affect response to the point where it would be disadvantageous (sp)? Also, wouldn't the air be bottle-necked at the throttle inlet anyways, because it is only 2" right? I know that the newer Greddy kits use a new elbow, but the older ones used the stock inlet, and I haven't read of anyone having problems, so does this small sizing difference even really matter? All of the piping ranges from 2.5 to 2.0 inches. Thanks in advance.

Oh...and if anyone with this kit can give me any insight as to how I'm gonna get my intake to work, that'd be awesome too. *lol*

 

The question is if it's significant?
Stock turbo?
Going from 2.25" to 2.5" you would probably not feel that much of a difference.
If you want from 2.0" to 2.5", I'd be you would definitely feel a difference.


-Ted

 

Yeah, it's an S5 turbo on an S4 engine. The piping from the turbo goes (if I remember correctly) 2.25 pipe to 2.5 pipe to 2.25 elbow. Then the core, then 2.5 all the way up to the pipe right before the inlet, which will probably be 2.0 to fit with the throttle. I just wanted to know if I'll lose alot of power/performance, and should I just try to get the piping made all the same size (though that would mean I'd hafta spend more money). I guess it's more of a question of would me getting all the piping made over in the same size make any difference in performace to justify the price it would cost (kind of a confusing sentence? *lol*). Thanks for the help so far, it's really been buggin me, haha.

 

If you're running the stock turbo, keep it all 2.0" if possible.
Running up to 2.5" on the stock turbo just hurts response.


-Ted

 

when is the need for bigger IC piping???
as in HP and size of turbo?

 

Crap, oh well. *lol* I'm gonna go to a shop sometime this week and get the piping made. I plan on getting a BNR stage 1 or 2 in the near future though, so would 2.25 be ok? That's the sizing I planned on getting the piping all along, I just didn't want to have to spend more money to get it all made.

 

A good rule of thumb is to stick with the size of the outlet on the compressor side of the turbo...

 

a year ago I would have said around 400 hp but with the water/alky/meth injection kits on the market today I don't see to many people upping the size of there pipes.

 

OK ..THANKS
i got me a aireaserch stage 2 coming and wondered if i should get bigger IC piping...i gots 2 inch now...
i was told its good for 320-380 ish HP
*shrug*