7racer

well,

I just put the top pipe on to the stock box as I had a fitment problem with a koyo and rx7fashion airbox...

I can here the turbo easier and it seems to spool quicker...

but hard to tell...I personally think that it is a wash for the stock system. It might be more apparent if you had a bigger turbo or more boost or an intercooler....then I think MAYBE you may notice due to the great need of airflow....

so for the stock....besides the bling bling factor...forget about it!

tookwik

The only difference I believe it makes is sound wise. It makes the turbo REAL noticable

BATMAN

I do feel the difference past 6kRPM for sure.

It seems pull harder to the top. Not that dying off feel u get.

TTurboXfd3s

yeah for me it seems to pull quicker! and maybe a little harder but that might just be me! and i don't really feel the difference in turbulance

neevosh

It should make a difference since it gets rid of those accordian tubes. Those can't be the best for airflow. I think the stock ones are made for noise suppresion first and airflow second.

BATMAN

also the stock ones are desgined for felxibility in mind.

1FooknTiteFD

The stock rubber pipes are usually prone to heatsoak after several tens of thousands of miles and get brittle and start cracking so that you get a boost leak. The idea of getting hardpipes is just so that they don't break plus they look cool but how there should be no performance benefit

BATMAN

Victor,

I think ur talking about the IC pipes.

The intake pipes are the ones that draw air from the Air box.

It is negative pressure and has nothing to do with boost leak which is positive pressure.

Also, my stock intake pipes never wore out. That part is original up until recently. I'd say about 200k miles.

Hoover on www.turbohoses.com can enlighten u since he knows the dynamics of turbulence in intake pipes, etc. more then anyone on this forum.

I asked him to chime in when he has time.

meanwhile u can read this:

https://www.rx7club.com/forum/showth...threadid=89619

matty

are you serious? u think u could feel a difference by replacing intake pipes....it must be 1 or 2 hp. thats a sensative butt dyno u got there....i think it is your imagination.

BATMAN

I'm not the only one that feels it.

Scroll up.

dubulup

I would think with hard intake pipes, efini y-pipe, and hard IC pipes...the difference would be noticeable...

matty

then both of u are crazy.
not trying to be a dick but i cant see it..sorry.

Brentis

I think they would make a sizable difference at or over 12psi following the 4500 rpm or so. The effective intake diameter of the hoses is less than 2" (I've heard 1.5") with the accordian impact.

Here's a link with detailed thoughts on it. I'm looking into getting some fabricated out of Aluminum and having ceramic coating put on them (either cermakrome or Black Satin) PM me if interested. Hopefully will be able to get them for $125-$165 or so. Shouldn't heat soak like the stainless ones.


https://www.rx7club.com/forum/showth...hreadid=157806

BATMAN

Matty are u familar with those dynamic properties?

Please lecture us..........

Brentis

The piping friction has more impact on intake efficiency than temperature at mid to high rpm

http://www.thesoftwareprompt.com/tsp...efficiency.jpg

BATMAN

I wonder if Dr. Matty is copying this?

matty

are u attempting to insult me....?

How much air do u think flows thru those pipes? Do you think there is a significant difference in volume...difference enough to feel a difference..my opinion is no...yours is yes. done.

BATMAN

ur the one that threw the first punch.

Scroll up if ur memory is lacking chump.


and there are others that see and agree with my point and u mock them.

Ur smucken fart

rotaryheavenrx7

The rubber pipes swell up under boost and you work your turobs harder , iknow by switching to hard pipes on my old DSM i gained 1 PSI on the same MBC setting wich means if i was running 17 PSI on the rubber pipes i only say 16 of that and then with the hard pipes the same 16 PSI was more effecient on that Puny *** turbo


so basically they'll help your turbos not work as hard if your pipes swell under boost...

bureau_c

Rubber intake pipes are not going to swell...they may collapse however, I've heard of that happening with old, weakened stock pipes. Obviously, if that is happening and you replace them, you'll notice a big difference. If your stock accordion hoses are in good shape then I tend to side with those who think the perceived difference is imagination, but that's just me. I could swear I felt a difference when I changed to Royal Purple oil, but I know in my heart of hearts it was purely imaginary.

jds

matty

you are a wierd dude...!

i wasnt punching anyone....i was simply stating my opinion that the hard pipes couldnt possibly offer anything besides being attractive.
if others disagree..then they disagree.

ttb

how much turbulence can air in the intake have? i doubt any different with the aftermaket intake pipes. plus they are metal, which probably conducts more engine from the engine bay so you got hotter air. probably placebo effect.

Brentis

Here is a kiddie anecdote.

Go buy a straw that has the accordian flex at the top to facilitate bending. Then use a normal straw. Insert each into your favorite liquid and suck. - Compare the resistance of the fluids to each and you note significant increase in effort as well as reduced intake with the flex top.

Try it - or have your kids try it.