Help Reaching 400kw On Gt35r

[bubba]

Kyle was very up front about it, right from the get go when I told him what setup I was going with, he advised to go the bigger gate.

[r33_racer]

600hp tial housing? as in one of the new s/s casted v band rear housing? if so.....*drooooool* Would be interesting to see how they work..unless your talking about a gate, not exhaust housing.

People can get to 400rwkws. Easily without many mods 320-350rwkw. As usual depends on head work, cams and the rest.

atm, we have a gt35r with a 1.06 rear making 390rwkws on 20psi.

Edited October 20, 2009 by r33_racer

[DCIEVE]

Only natural I guess since its now a common issue that alot of people are experiencing with merge collector manifolds.

Out of curiosity when did he not admit it, or atleast to you?

Yes directly before the sale and then once running when I was experiencing problems. I'd rather not get this thread shut down so I'll leave it at that.

[r33_racer]

fair enough mate.

[cactus]

fair enough mate.

How difficult is it to cut into the exhaust housing to make that modification for the wastegate? Can it be done at home if you have the necessary skills/tools i.e. is it simply cutting a 45mm (45mm gate) size hole anywhere on the exhaust housing and welding a bend to it?

[r33_racer]

I found a point where i thought the gas would flow nicely into the outlet and then used a holesaw to cut the hole where i wanted it, did some cleaning up and radiusing with the die grinder and then cut my 90 bend and shaped it to sit over it how i wanted then tig'd it on. I imagine you should preheat the housing around the area where you weld it...I just let it the heat build up with the tig before actually welding it on....not the best way but its worked without any problems...did this fix on both the road car and race car.

I did it all at work with a dummy head and rocker cover and fitted it all up so it would all clear and whatnot...unless youve done it before, i dont know how well you will do it by having a guess at it.

Hole size was more like 30mm from memory as you cant take a 45mm chunk out as the section of housing is only about that wide overall....once you have a closer look at the actual inside area of where you want to put the outlet on it you will see just how big a hole you can cut.

I imagine if you had the skills and tools you could easily do it at home.

[SirRacer]

Here are a couple of before/after pictures of my engine after putting the gate out the housing. Pretty much identifical to r33 racers setup.

Works brilliantly as well my car now holds boost to the psi right up to redline.

[DCIEVE]

It's nice to see you guys have welded the gate pipe tangential to the exh housing, most people seem to weld it on at right angles which can't be doing them any favours!

[unique1]

Do that to yours Nick and save the hassle of redoing everything again. The housing is worth stuff all anyway if u wanna sell the turbo later on. Doesnt look dodgy at all either. Quickest, cheapest and easiest fix by far for the problem.

[SirRacer]

It's nice to see you guys have welded the gate pipe tangential to the exh housing, most people seem to weld it on at right angles which can't be doing them any favours!

I think its a little easier with the 1.06 housing as well due to the shape. Im not a massive fan of how mine looks and may heatwrap the screamer pipe to make it look a tad tider, but the cars a race hack so i shouldnt care too much.

I brought this housing brand new for 250NZD from a friend who didnt use it, but i think they are normally 450AUSish. Its cheaper to weld into the housing and replace it if you ever sell the turbo than spend a huge amount on a 60mm wastegate.

[T04GTR]

so what if one was using a twin scroll ex housing?

and what was done with regards to welding it. cast iron is dificult to weld at the best of times..

[Jap_Muscle]

hey guys, heres a dyno graph on what we achieved. we cant get any more out of it no matter how much boost we put in.

any comments?

[r33_racer]

You never said what intercooler you are using and what size piping? Unless I missed it.

But to reach 400rwkws, you will need 3" inch intercooler piping everywhere and atleast a 100mm thick cooler. Years ago we stonewalled around 320-330rwkws on our race car and it turned out our i/c piping and intercooler were too small. Got a new i/c from ARE and I made new piping (3") as per above and our power jumped straight up to 380 or 390rwkws. RB30det much the same as yours.

[Jap_Muscle]

You never said what intercooler you are using and what size piping? Unless I missed it.

But to reach 400rwkws, you will need 3" inch intercooler piping everywhere and atleast a 100mm thick cooler. Years ago we stonewalled around 320-330rwkws on our race car and it turned out our i/c piping and intercooler were too small. Got a new i/c from ARE and I made new piping (3") as per above and our power jumped straight up to 380 or 390rwkws. RB30det much the same as yours.

the cooler is a a just jap thing, nothing special. its got 3" piping on the int side and 2.5 on the exh side. the reason for this was because of the q45 afm we used back wen we were using a normal PFC but have since switched to a D Jetro (Mafless)

thanks so much for the tip on 3" piping. i never would of thought it would be that much of an issue. are you sure you didnt change anything else?

was there a bi difference in lag when upgrading to 3"?

cheers

[R31Nismoid]

You never said what intercooler you are using and what size piping? Unless I missed it.

But to reach 400rwkws, you will need 3" inch intercooler piping everywhere and atleast a 100mm thick cooler. Years ago we stonewalled around 320-330rwkws on our race car and it turned out our i/c piping and intercooler were too small. Got a new i/c from ARE and I made new piping (3") as per above and our power jumped straight up to 380 or 390rwkws. RB30det much the same as yours.

Or done any other testing as people have advised...

BTW (incase you didnt see), there are now two threads existing on this

http://www.skylinesaustralia.com/forums/Ad...20#entry5205066

[Jap_Muscle]

sorry about the other thread, it did get sort of side tracked. on that thred but it was purely about the cams. ill stick to this thread.

do you know who offers 100mm core coolers? as far as i know trust have a drag cooler that is 100mm.

[R31Nismoid]

It only became sidetracked because you still haven't done any actual problem/fix testing after 6 months... And you've LOST more power... so clearly something is fked and getting worse.

So until you workout where the problems are, you shouldn't be going and changing other bits'n'pieces in the hope it will "fix" it - because unfortuantely it won't

[r33_racer]

I missed the other thread. Well that explains more.

Its possible the extra boost is causing issues with power making because of the restriction in the i/c and part of the piping and if there is alot of back pressure in the exhaust then thats only making the problem worse.

Perhaps a gauge in the exhaust to measure what back pressure you have with your current system.

[Jap_Muscle]

i guess the first thing ill do is order a new cooler and then drop the exhaust to see if there are any major gains.

ive been sifting through my intercooler options and i think i might get one of those NISMO ones. nengun advertising for just over 2k delivered. yum

[R31Nismoid]

You could get a locally made product that is just as good for around half that price