So - Everyone on here seems to be saying you need to get bigger diameter piping to benefit from other upgrades

Why is this? - I can't figure it out

If the turbos have an outlet on the compressor side with a diameter of approx 45mm and the air is being forced out the turbo through this 45mm opening why would i benefit from a 70mm pipe?

If the piping is larger wouldn't this reduce the speed which the air travels at?

What impact would this have on the air pressures?

Surely you would want the piping to be a constant size throughout?

I understand the logic behind the larger TB as this is where the two air streams meet

But what possible benefit can a larger pipe have before they merge at the Y-pipe?

 

In theory it follows the Bernoulli principle of fluid dynamics. Increase the cross sectional area and the velocity goes down while the pressure goes up. It's an inversely proportional relationship. I think you only really need the larger intake plumbing if you are using much larger turbos but I'm not certain.

 

Hi, The turbo intake piping is the biggest problem.. on the evo 700 kit they use 2.75 inch thermo molded pipe, Proto just looses the piping and puts a blow though MAF on. We use 2.5 inch pipe on K24 based turbos and on gt30's we increase the size to 3 inch... The worth of all this is to allow the turbo to draw more air with less restriction. There is also a decrease in turbo "lag". As the turbo begins to spool it will pull a larger volume of air than the stock intake pipe can deliver, This causes a negetive pressure to be created which pulls the air molecules apart. Now the turbo needs to compress this less dense air. Not very efficent. Here to assist, Tim

 

I got one for sale in the forsale section if you need.

 

Ok...you discussed the piping and some of the attendant issues on the intake side....but then what happens when you put a 300 cell cat on there and create back pressure? Does it make much sense to use 70mm piping, then leave a restrictive cat on there?

I know that most of the tuners all recommend 70mm piping....but what has never been answered to my satisfaction is ....at what threshold can the 60mm piping sustain decent performance when coupled with 100 cell cats and a K24 turbo? Everyone wants to sell you the big stuff....more power, bigger cats, larger pipe, larger turbos, better wastegates, new DV's etc......but what I'd like to hear is....for a plateau of 500-600 rwhp....what's the configuration of a system that would meet this HP level without going to the "big stuff"? Let's hear the basics....not some application that would allow you to jump to the next level without having to go to larger pipes etc. I realize that Stage 2 and 3 are great...but what about the guys who want a bump up from stock without spending $10K or more.

 

hi guys
i tried the k24/20g's with the stock intake piping and catless miltek exhaust... and its a nogo the things just would not spool they would try but then just choke up... i slapped the 18g's back on and it worked like a champ... so i went out and bought the proto air intake threw the 20g's on flashed it with a base tune from proto and made 622awhp.. so in my case the larger intake piping worked well...
tim

 

YOu only need bigger diameter intake piping when ur upgrading to bigger
turbos... especially 600+ rwhp...


here is what you have..... air coming from the air box into this web of twisted junk...



and here is what you replace it with.....





tell me which one looks more restrictive???

 

I have the Evo intake wed to the proto maf and the S-Car-Go intake piping

 

 

622awhp on what ? 1 bar?

 

1.35 ish

 

I was hoping someone would say that!

Can someone please explain why (using physics) it would be advantageous to decrease the air-speed and increase the pressure?

If we change the size of the piping this is exactly what will happen - can't argue with physics

So - why would we want to do that?
How would it be beneficial?

 

Because of cooling, and also flow characterstics of the piping itself. The parasidic drag created from the high speed flow of larger turbos actually slows down the intake charge. As well, the larger flow from bigger turbos will cause the piping to cave in on itself.

I think

 

I am interested to hear peoples thoughts on both the intake pipes as pictured by Sean - and also the Y-pipe kits that are available

 

I have the EVOMS intake pipes and I noticed a difference in the amount of time it took to spool. I also think that I picked up some HP with them. I am running GT3076/K24 Hybrids so I REALLY needed pipes. I suggest them to anyone with a bigger turbo. I know even Chris Green and Marty run bigger pipes on their K24/18G cars.