R34 Neo Custom Intercooler Piping Size

[Selleck 34GTT]

Hey guys, im guessing this has been roughly covered before but did some searching and couldn't get a definitive answer.

Im after some info on piping size I should run.

im putting a 3076 or 3071 on 6boost mani with a r34 gtr front mount so its got 3" inlet and outlet.

im also getting a plazmaman with new tb of whatever size I need.

im looking to get 300kw or just over atw with minimal lag so I don't want to go 3" piping if itll just add lag.

what I was thinking is 2.5" from turbo to ic with a reducer and then 3" from ic to the tb and obviously get a 76mm tb

will this be the best way or should I just keep it 2.5" all the way and use reducers either side of the gtr ic.

[Dose Pipe Sutututu]

stock intake manifold = less lag for your 300kW goal

[KiwiRS4T]

Stock throttle body will be fine - you may need to buy or make an adapter.

[GTSBoy]

Stock throttle body has the traction control butterfly on it which is gaids for a FFP installation. Either obtain a new TB or a TB from a Stagea Neo. Note that factory ECU+Nistune is barest minimum to permit that sort of change. Standard ECU will of course have kittens if left to itself.

[scotty nm35]

Sticking with 2.5 inch can allow this piping setup, with no holes under the battery. It can come in very handy when the cops pop the bonnet.

[Selleck 34GTT]

johnnilicte - how much more lag am I looking at, surely not much being still on the standard runners..

GTSBoy - Im ditching the traction control, and as stated purchasing a plazmaman throttle body.. and I already have a power fc

scotty nm35 - pretty sneaky there, never even thought of running it that way, probly not the best for flow though..

any way of making the hole through the side look standard like a gtr, im going with all black plenum and piping for that reason

[scotty nm35]

scotty nm35 - pretty sneaky there, never even thought of running it that way, probly not the best for flow though..

any way of making the hole through the side look standard like a gtr, im going with all black plenum and piping for that reason

It flows better than a return flow, and less piping.

I never understood why the pipe goes underneath the cooler in the return flow setups, and the core is always hiding up behind the intrusion bar. Not good for cooling imo.

[Dose Pipe Sutututu]

johnnilicte - how much more lag am I looking at, surely not much being still on the standard runners..

GTSBoy - Im ditching the traction control, and as stated purchasing a plazmaman throttle body.. and I already have a power fc

scotty nm35 - pretty sneaky there, never even thought of running it that way, probly not the best for flow though..

any way of making the hole through the side look standard like a gtr, im going with all black plenum and piping for that reason

around 200~300rpm, have a look at the dyno charts on the RB25 turbo results

[GTSBoy]

I never understood why the pipe goes underneath the cooler in the return flow setups, and the core is always hiding up behind the intrusion bar. Not good for cooling imo.

I had my return flow custom made (in 2000!!!) and we put the return pipe behind the reo. Core is using the whole opening of the GTR bar. Very successful.

[Selleck 34GTT]

so still no real idea on piping size

[Selleck 34GTT]

btw johnnilicte im thinking of getting a custom plenum still on the standard runners, possibly a slightly smaller one would let it spool up earlier than the 5.5L capacity advertised by plazmaman??

[Dose Pipe Sutututu]

I don't think Alex sells different sized ones, what's wrong with the stock one?

[Selleck 34GTT]

if I get a custom one it will most likely be from racers choice, a local fabricator..

I want to go forward facing to tidy it up a bit and make plug changes easier

[Dose Pipe Sutututu]

if I get a custom one it will most likely be from racers choice, a local fabricator..

I want to go forward facing to tidy it up a bit and make plug changes easier

Just get the Plazmaman one, it's nicer.. most other fabricators use sharp edges etc... where as the Plazmaman one is nice and smooth promoting better airflow...

I still say stick to the stock one, unless you're chasing 350kW+

Look at AngryRB, he's made over 320kW+ on the stock one.

[GTSBoy]

Yuh, the whole "nice and tidy and easier plug changes" thing is a bit of a tired line. You only need to change plugs infrequently, and it is no more than 15 minutes work to get the crossover pipe off if you have to.

There are distinct negatives associated with FFPs (usually they cost response and the cops love them), with barely enough positives to justify....for a street car. On a race car, go right ahead and spend your money.

[Ben C34]

If worried about plug changes leave the coil cover off, heaps of money saved!

[Selleck 34GTT]

I already spoke to the guy, hes a friend of a friend, said he would do a good price (less than plazmaman) and has the machine to roll the alloy so it will be rounded like the plazmaman.

I know the plugs aren't that much of an effort, but it just looks heaps better than the pipe coming out and then swinging back over the top of the motor.. im hoping to have everything black so as to not draw too much attention when the bonnets open

[GTSBoy]

Unless shooting for a bazzillion HP, then return flow cooler = pipes through standard holes and no pipe across gap between rad and engine.

[Selleck 34GTT]

going high mount on a 6boost exhaust mani so return flow wont work

[Selleck 34GTT]

lol still have to pull the pipes off to get them out, and don't particularly care to get water in there

If worried about plug changes leave the coil cover off, heaps of money saved!