Upgrading Manifolds On Gtr

[heslo]

Alright guys, in the process of buying some go fast bits for my GTR and just have a question. I'm looking at getting some GT2860-5 turbos and thought while I'm at it, why not upgrade the standard manifolds to something like the Tomei Expreme items. Only problem is, is the roughly 1k for the manifolds a waste of money? Are there any real noticeable performance gains or should I be looking to spend that money else where?

The car has a PFC, 600CC injectors, clutch, AFM's and fuel pump all ready to go in just looking at the last few pieces... Any help here would be appreciated...

Cheers

[R31Nismoid]

I've been told not to bother by Racepace, and none of the other cars running those turbos are using manifolds either.

For bigger turbos i believe yes (like GT-RS) but for -7, -5, go with factory for the cost.

The Tomei dumps are nice though, i've got a set going on at present.

[Swiper the Fox]

I've been told not to bother by Racepace, and none of the other cars running those turbos are using manifolds either.

For bigger turbos i believe yes (like GT-RS) but for -7, -5, go with factory for the cost.

The Tomei dumps are nice though, i've got a set going on at present.

the beauty of the stock manifolds is their ability to retain gas path heat due to their cast thick wall construction. If manifolds are upgraded is is necessary to perform some form of heat retention i.e. Ceramic coating or thermal wrapping.

if its a street car...retain the stockers...if you want gains you may opt to extrude hone them to improve flow.

[heslo]

Ah, thanks for the heads up guys Looks like my wallet will be 1k healthier Might have to see about getting the extrude honing done, what's the rough cost involved?

[noone]

the beauty of the stock manifolds is their ability to retain gas path heat due to their cast thick wall construction. If manifolds are upgraded is is necessary to perform some form of heat retention i.e. Ceramic coating or thermal wrapping.

if its a street car...retain the stockers...if you want gains you may opt to extrude hone them to improve flow.

Was considering a set of these for my semi-track car, still street driven. have alreadt got the trust dumps wih ceramic coating and had planned to coat these manifolds and exhaust housings on my turbos HKS2530's mostly to try to reduce underbonnet heat though it sounds like this may resolve the problem you mention also. And having them match ported.

Just curious if anyone thinks these offer any real gains over the same treatment to the stockys

Edited May 9, 2008 by noone

[bloodzkull]

speaking of extrude honing is there anywhere to get it done in brisbane?

looking to get a standard set of manifolds honed and coated.

[VB-]

http://www.skylinesaustralia.com/forums/To...ds-t218548.html

start reading from post #4