Cant Get More Than 315Kw Atw

[Jap_Muscle]

not sure if this helps buddy but i was stuck around 350rwkw for a long long time until we found that our CAS was faulty. After replacing it power shot straight to 390rwkw.

Might be worth checking it if you see signs of back fire and stuff like that as they tend to fail quite often.

[s13_Skyline_inside]

Took it to unigroup, still didnt make power after fixing exaust housing issue but found the exaust to be smaller than 3inch in the mufflers, a fair bit smaller, so got a new cat back made by performance exaust in northmead, really happy with workmanship and the service they provided, so is now 3.5 inch all the way through, straight through 3.5 inch mufflers, will be booking it back in with unigroup asap, was told the exaust was dropped at the place i went to before but the turbo issue was still there so now the exaust side of things are all sorted, the car felt better after the turbo was sorted but feels heaps better with this exaust on but its only got a basic tune so i cant stretch its legs will post after i take it back to unigroup

[s13_Skyline_inside]

Took it to unigroup, still didnt make power after fixing exaust housing issue but found the exaust to be smaller than 3inch in the mufflers, a fair bit smaller, so got a new cat back made by performance exaust in northmead, really happy with workmanship and the service they provided, so is now 3.5 inch all the way through, straight through 3.5 inch mufflers, will be booking it back in with unigroup asap, was told the exaust was dropped at the place i went to before but the turbo issue was still there so now the exaust side of things are all sorted, the car felt better after the turbo was sorted but feels heaps better with this exaust on but its only got a basic tune so i cant stretch its legs will post after i take it back to unigroup

[sultanaz]

haha farout ! car love !

when u find the problem man i'll be reading it

[Jap_Muscle]

any more info

my 26/30 is making 316rwkw on 17psi and makes no more on 20psi so kinda curious

i do have a cat in was gonna take it out

Post your full build specs

[GTR_JOEY]

Took it to unigroup, still didnt make power after fixing exaust housing issue but found the exaust to be smaller than 3inch in the mufflers, a fair bit smaller, so got a new cat back made by performance exaust in northmead, really happy with workmanship and the service they provided, so is now 3.5 inch all the way through, straight through 3.5 inch mufflers, will be booking it back in with unigroup asap, was told the exaust was dropped at the place i went to before but the turbo issue was still there so now the exaust side of things are all sorted, the car felt better after the turbo was sorted but feels heaps better with this exaust on but its only got a basic tune so i cant stretch its legs will post after i take it back to unigroup

any updates yet mate?

i really hope it isnt ur car thats taking up all of Yavuz's time... stopping mine from getting tuned

[monty_r33]

I hear ya!!

RB30/26

Spool race spec head ported and polished

hks 272 cams

tomie cam gears

sard fuel rail

sard 880cc twin spray injectors

Adjustable fuel reg

Standard 26 plenum with standard 6 throttle setup

Drain back from back of head to sump

6boost exhaust manifold

turbonetic gtk1000 turbo

tail 38mm gate

5inch dump into 4.5 straight though exhaust with hks dragger cannon

splitfire coils

Bottom End

rb30 block (Has been o'ringed runs standard rb30det head gasket)

rb30 standard crank ballanced With arp studs and acl race bearings

rb30 standard rods ballanced with arp studs and acl race bearings

rb30det cp pistons (dish tops) (85psi per cylinder)

JUN oil pump making 100psi when cold and around 65psi when warm and around 80-90psi under boost

ATI ballencer

Arp 12mm head stud

Power by

Microtech lt12s

bosch intank pump thats feeds a surge tank with 2 bosch 044 pumps feedind fuel rail

Eboost 2 for boost control

And only making 441hp on 18psi. Depressing after spending near 50g on motor only. Been to 4 different tuners and all have been from 420hp to 490hp.

hi guys, just got my rb3026 run in and the proper tune done on it but we cant get it past 315kw atw, doesnt make any more power, can wind in more boost pressure but it doesnt make a difference. here is the mod list

rb3026

t04z .84 rear housing

50mm gate

hdi rs spec cooler (95mm thick one)

pon cams b spec 9.15mm lift 260 duration

cam gears

ported head standard size valves

3.5" turbo back and cat, 3" from cat back

splitfire coil packs

1000cc injectors

built engine etc

its like there is a restriction somewhere, pulled exaust off before cat, made no difference, took of turbo inlet pipe, made no difference, checked the cooler incase i left a rag in the but nope. as I said the boost pressure is there but its like the flow is not and the pressure holds steady till redline it doesnt taper off at all. this setup should be able to make 400kw so yeh if anyone has any ideas id love to hear them

car goes fkn hard but yeh id like the extra kilowasps that should be there lol

cheers

[Jap_Muscle]

My gt35r 26/30 setup was stuck at 350kw no matter what I did. Even whn using e85 it only gained about 18kw no matter how mch boost we used.

We replaced the Crank angle sensor and power shot to 403kw straight away on less boost.

If you've got a older gen skyline I hear things things tend to be on their way out. But to be safe I'd be checking that. Makes sense why it wouldn make more power/boost if the timings unstable.

[s13_Skyline_inside]

Sorry for the late reply, put on an exaust the is 3.5" all the way through, made 414kw atw, 350kw atw @ 5k rpm

[XKLABA]

Sorry for the late reply, put on an exaust the is 3.5" all the way through, made 414kw atw, 350kw atw @ 5k rpm

good to hear been along time in the fixing, the pesty exhausts do it every time, to bad the guy that was meant to drop the exhaust the first time clearly didn't, cause if he had of this would have been sorted long ago

[GTR_JOEY]

Sorry for the late reply, put on an exaust the is 3.5" all the way through, made 414kw atw, 350kw atw @ 5k rpm

good to know 3.5 will run 400kw plus

i was a little worried that my 4 inch dump into my 3.5 system may be a bit restrictive for the power figure im chasing

obvioulsy its fine

Edited January 15, 2012 by GTR_JOEY

[Matthew Black]

any more info

my 26/30 is making 316rwkw on 17psi and makes no more on 20psi so kinda curious

i do have a cat in was gonna take it out

I have similar issues my tuner told me the cams were chocking, i am using factory cams and springs also you can never get the timing rite by lining up the timing marks by eye

just brought tomei 260 cams and springs and i will be using this site to set up cams.

http://www.nicoclub.com/archives/how-to-degree-an-rbxxdettt-camshaft.html

[TiTAN]

wont be the cams limiting your setup to 300kw unless something is set wrong. 394kw on a GT35 and stock cams.

yes cams will help at that power level but they wont stop you going past 300 like a wall.

[R32Abuser]

^^^^^ +1

Still have this issue on my car but for a GT3076R. Hit a wall at 250-260RWKW on my RB 25/30. Was told it was the cams. Cams made small difference, but DEFINATELY were not the problem.

It is beyond reasonable doubt caused by something set wrong as far as timing goes.

Hence, I'm sending it to another workshop to be re-timed and rechecked meticulously.

[Jap_Muscle]

Can confirm stock cams will not limit power like others have mentioned. They can make 400kw+

Stock cams and springs

gt35r .82

3.5 ing exhaust

Exhaust port on head

22psi

403rwkw

As mentioned guys please check your CAS.

Edited February 14, 2012 by Jap_Muscle

[Matthew Black]

that's not what i want to hear. I just brought cams

i am not using vct iv got rb20 cams in insted could that be an issue

don't think its cas it doesent miss or break down

seems everyone has 3.5'' exhausts i got 3'' dump to 80mm nismo exhaust might be too small i dunno

Edited February 16, 2012 by Matthew Black

[R31Nismoid]

If your tuner told you that you "needed" cams, then he has no idea.

As you've seen there are that many guys who've made some great power with essentially stock heads.

A 3" dump is too small for a 700hp turbo (GT35).

[s13_Skyline_inside]

Even though you have a jap exaust that is X size, have a good check inside the mufflers/cannon my pipe was 3" but inside the cannon it was more like 2" or even a bit less, huge restriction, i never thought to look in there until it was pointed out to me

Edited February 27, 2012 by s13_Skyline_inside

[Matthew Black]

1. installed new cams and springs tomei 260 8.8mm befor was 288kw on 15psi now with cams 353kw on 17psi, The engine liked more timing then boost to make power.