How come no one makes a full replacement silicone SMIC pipes?

[AdamVR4]

Nothing really imo.

Combined diameter of the stock pipes is the same as the stock tb and plenum.

So even if you upgrade to 2" piping it will bottleneck at the tb/plenum.

I don't know if anyone agrees with this but It's just my logic. If it's flawed I want to hear your reasoning.

Pressure drop is a function of length. Sure, the TB will be a source of pressure drop, but that doesn't magically make pressure drop through the tubes leading to it go away, nor will it completely negate improvements made upstream. Google pressure drop in pipes to learn more.

[Ange]

Pressure drop is a function of length. Sure, the TB will be a source of pressure drop, but that doesn't magically make pressure drop through the tubes leading to it go away, nor will it completely negate improvements made upstream. Google pressure drop in pipes to learn more.

No don't know much about that. But why even Count with it? It's just semantics. The pipe length will always be the same with twin turbos. What we can change is pipe diameter, intercooler size, tb and plenum. And adapt it all for the CFM output.

[Greg E]

so with CX kit you just have to replace 5 couplers to straight 2" and the snorkel to a 90" pipe.

chop this to 5 couplers for price save 2" 50mm 1M Straight Silicone Coolant Hose Length Intercooler Pipe Blue | eBay

and get this Universal Aluminum Intercooler Pipe 90degree 2" 51mm | eBay

And done. 2" all the way.

But true cx doesnt always deliver quality. Their welds car be shitty. So check the insides of the pipes for loose alu pieces.

Tried that already.

Just sold that pipe set...

I might still have the modified 90* piece somewhere. I used a 45" coupler to a 90 which went down to the drivers IC. The order was IC -> 2" coupler -> modified 90* hard pipe -> 45* coupler -> CX racing hard pipe (which goes across the front of the engine to the y-pipe)

It was too tall and shortening that 90 anymore would have gotten into the radius of the bend.

Terry, if CX Racing could replace that funky "whale penis" coupler with one that was 2" I'd be happy. ...and if their y-pipe BOV hose was a true 1.75" adaptor instead if a 2" so that the stock rubber BOV hose fit without a fight, the whole set would be perfect.

[mb7050]

So with my stock ic piping snd my 8x8x4.5 ics at 15psi I should expect a 2.5psi drop?

Have people reslly had issues with rust etc on ic pipes? I've had no issues with mine on a 23 year old gto. However it has never seen salt before.

Sent from my GT-I9300 using Tapatalk

yes but keep in mind if you plan to raise the boost the stock piping becomes a big restriction.

and never have I had any rust issues either.

[mb3000]

Ray has stock piping on his DR750 car, so there is really no reason to make them larger.

[Ange]

Ray has stock piping on his DR750 car, so there is really no reason to make them larger.

2" piping
1.57 x 2 = 3.14 sq in
300 cfm = 156 mph = 0.20 mach
400 cfm = 208 mph = 0.27 mach
500 cfm = 261 mph = 0.34 mach
585 cfm max = 304 mph = 0.40 mach

I'm guessing they are ~550cfm max each turbo. So 2" should be good for them.

Smaller piping than that would mean more than mach 0.4 = flow loss. 1.6" pipes will definately be too small.

[vTaKwiTHsLiCkS]

I believe Ray is running an HKS or DNP hard pipe kit on his car.

What are the going rates for DNP hard pipe kits these days anyways? I got a buddy who has a set that's just sitting collecting dust since he went FMIC.

[mb7050]

Ray has stock piping on his DR750 car, so there is really no reason to make them larger.

you sure can get away with small charge pipes if your ok with the pressure drop.
use this calculator for example
Compressed Air Pipe Lines - Online Pressure Drop Calculator

DR750's/or similar 2" piping at estimated ~25psi of boost and 750cfm of flow per turbo
q = 750 (cfm)
L = 11 (length of piping ft)
d = 2 (inside diameter of intercooler piping in.)
p = 40 (the standard atmospheric pressure at sea level = 14.7psi + 25psi of boost)
PRESSURE DROP = 1.08psi

DR750's stock 1.5" ID piping at the same estimated ~25psi of boost and 750cfm of flow per turbo
q = 750 (cfm)
L = 11 (length of IC piping in ft)
d = 1.5" (inside diameter in.)
p = 40 ( 14.7atm + 25psi boost)
PRESSURE DROP = 4.55psi.



use the same calculator for ~15psi or about 360cfm

stock piping
q = 360 (cfm)
L = 11 (length of IC piping in ft)
d = 1.5" (inside diameter in.)
p = 30 ( 14.7atm + 15psi boost)
PRESSURE DROP = 1.56psi.

2" piping
q = 360 (cfm)
L = 11 (length of IC piping in ft)
d = 2" (inside diameter in.)
p = 30 ( 14.7atm + 15psi boost)
PRESSURE DROP = 0.37psi.

[mb3000]

I'm not disregarding theory. Fact is, Ray makes more power than just about anyone with TD04's. There really isn't a good reason to do anything past the hoses that DBest tested out, because nobody is making more HP than Ray with side mounts. I have never seen the factory hard pipes rust due to their coating.

Custom 2" pipes for sidemounts would be cool, except the price of that and a quality set of sidemounts would probably put you in the hole for more than a quality FMIC would. And let's be honest, 95% if not more of the big power guys run a FMIC. There's simply little to no market for this kind of thing, as Was shown with J and his custom SMIC group buy thread.

[Greg E]

Ray has stock piping on his DR750 car, so there is really no reason to make them larger.

False. Ray has always had the DNP kit with a custom set of SMICs with 2" inlets/outlets.