Just Done Nistune!

[myRB25DETT]

Hi all, Cut story short, just done a nistune, on my way home, im experiencing (twice) lost power (about milli seconds) and power came on again ... One, when i was on the freeway did normal speed 100 k's and tried over take someone and then power lost or boost drop or maybe boost spike idk... Then second time, floored it then it happened again?? Im bout to talk to the tuner tomorrow, but i just want to knw wat it is?? Its set up 13 psi on a stock turbz , stock inj... Mods are ; full exhaust, pod , ebc controller , fmic and walbro fuel pump...maybe its not liking the 13 psi ?? Should bring it down to 11-12 psi?? Im only getting 194 rwkw @ 13 psi with a lot of tourqe..

Edited July 12, 2011 by myRB25DETT

[R31Nismoid]

13psi is a time bomb on the stock turbo. Back it off to 10-11psi which is much safer.

[GTSBoy]

Sounds like you hit the TP cut (what others call boost cut). Running that much boost will pull enough air flow through the AFM for the ECU to freak out. Nistune allows you to push the cut point up higher, but your tuner may not have done so.

By the way, I agree that 13 psi is risky on an RB25 turbo.

[045HOW]

My stock R33 series 1 RB25DET made 188rwkw on 10psi with pod,zaust,fmic,exhaust leak behind turbo and avcr with stock ecu. that figure for 13psi sounds a bit on the shit side of life.

[myRB25DETT]

But this tuner is a well known tuner here, id think he knows wats hes up to...car is a weekend only, and dont see any tracks, daily car... Anyways i will talk to him tomorrow..

[045HOW]

But this tuner is a well known tuner here, id think he knows wats hes up to...car is a weekend only, and dont see any tracks, daily car... Anyways i will talk to him tomorrow..

Well all i know is my mates R34 GT-T manual made 209kw on 10psi with pod,zaust,fmic and stock ecu.i don't know shit about aftermarket tunes but your tune sounds funky on many levels.

Edited July 12, 2011 by Blueone

[dont_ask]

I agree with everyone 13 psi is way to high ur turbo wont last long

[045HOW]

I agree with everyone 13 psi is way to high ur turbo wont last long

I dosed my previous 25 on 0.98bar for 6 months and nothing happened. but alas someone had to write my car off,so the effects never showed themselves lol.

[Torques]

That sound (as already written) like TP-Cut.

TP is the load the ECU calculates, if that's over a certain limit the ECU cuts fuel/ignition.

If you had your car tuned, the tuner should have taken care of this (so probably a different issue?)

194KW sounds about right.

Can you post your dyno?

Cheers ..

Hi all, Cut story short, just done a nistune, on my way home, im experiencing (twice) lost power (about milli seconds) and power came on again ... One, when i was on the freeway did normal speed 100 k's and tried over take someone and then power lost or boost drop or maybe boost spike idk... Then second time, floored it then it happened again?? Im bout to talk to the tuner tomorrow, but i just want to knw wat it is?? Its set up 13 psi on a stock turbz , stock inj... Mods are ; full exhaust, pod , ebc controller , fmic and walbro fuel pump...maybe its not liking the 13 psi ?? Should bring it down to 11-12 psi?? Im only getting 194 rwkw @ 13 psi with a lot of tourqe..

[myRB25DETT]

Cheers guys.... I will find out tomorrow... I knew i shouldnt be running 13....i will to ask him thoroughly tomorrow.. Thanks everyone.. Mods u can delete this thread now if ud like..

[045HOW]

194KW sounds about right.

How?

Edited July 12, 2011 by Blueone

[myRB25DETT]

That sound (as already written) like TP-Cut.

TP is the load the ECU calculates, if that's over a certain limit the ECU cuts fuel/ignition.

If you had your car tuned, the tuner should have taken care of this (so probably a different issue?)

194KW sounds about right.

Can you post your dyno?

Cheers ..

Im not questioning his ability, i guess its my fault as i was rushing it a bit as well and asking impossible figure originally, i will post result tomorrow or shall i say later as its already 1.00 am...

[Torques]

Since that's about the figure+ I had with the same setup

CORRECTION ->

(See my post below)

How?

Edited July 12, 2011 by Torques

[Torques]

I take it all back since I did not realize that we were talking R34GTT ..

I compared the figures to my R33 GTST!

Well all i know is my mates R34 GT-T manual made 209kw on 10psi with pod,zaust,fmic and stock ecu.i don't know shit about aftermarket tunes but your tune sounds funky on many levels.

Edited July 12, 2011 by Torques

[R31Nismoid]

My stock R33 series 1 RB25DET made 188rwkw on 10psi with pod,zaust,fmic,exhaust leak behind turbo and avcr with stock ecu. that figure for 13psi sounds a bit on the shit side of life.

Not really, his result is nice and realistic, it is your result thats a little inflated. Which is normal for some dynos as there is a 10/15 variance easily enough.

Stock RB25 turbos are only good for ~200rwkw @ 11-12psi

[045HOW]

I take it all back since I did not realize that we were talking R34GTT ..

I compared the figures to my R33 GTST!

I was gonna say...

Not really, his result is nice and realistic, it is your result thats a little inflated. Which is normal for some dynos as there is a 10/15 variance easily enough.

Stock RB25 turbos are only good for ~200rwkw @ 11-12psi

Maybe so but i still think that is a bit much boost for that power with a modified tune.

[LANDSCRIBBLE]

13psi is a time bomb on the stock turbo. Back it off to 10-11psi which is much safer.

this. mine lasted a good 6-7 months before the turbine wheel shattered into a zillion pieces

[SlowSkyline]

hmm i have a R33 stock turbo, tuned at 13psi in the mid range but drops off to 11.5 in the top.. no problems after a year and i have given it hell. Even a few skidpan days thrown in. Lucky i guess

[djvoodoo]

My R34 (Tuned by Toshi) running around 12psi, front mount, zorst,walbro (according to psi dyno reading taken from intake plenum) made 195rwkw. My EBC (greddy profec B spec II) reading peaked at 13 but then drops off to about 10.5psi at around 6000rpm. I have about a 1psi diff in boost reading from EBC to boost gauge :-(

Been running between 12-13psi for a year now, no signs of giving way yet, but then again, I use low boost setting alot more than high boost

194rwkw seems about right

[myRB25DETT]

My R34 (Tuned by Toshi) running around 12psi, front mount, zorst,walbro (according to psi dyno reading taken from intake plenum) made 195rwkw. My EBC (greddy profec B spec II) reading peaked at 13 but then drops off to about 10.5psi at around 6000rpm. I have about a 1psi diff in boost reading from EBC to boost gauge :-(

Been running between 12-13psi for a year now, no signs of giving way yet, but then again, I use low boost setting alot more than high boost

194rwkw seems about right

But mine is getting boost cut!!! Does urs??