Please Explain

[pork hunt drifting]

i bought a garrett 3076 .82 less than a year ago and bolted it up to my standard rb25 neo. only mods were afm, pod, fmic, nistune and zorst.

we made 250rwkw no warries so decided to up the boost a bit more and made 270rwkw at 6k rpm when the standard headgasket gave way in spectacular form. cracked the radiator a spewed coolant everywhere.

i towed the car home and put a new commetic headgasket on along with arp headstuds. i also got the head cleaned up before installing. the car started up and ran no warries. i only drove it for a week or so to work and back waiting to get it tuned up for even more boost.

but on probly the fourth day of having it running it stated to run like it was missing a cylinder on start up but would clear up with in 10 to 15 secs. and then run fine, i took it easy on it when it stated to happen. i got some new plugs thinking that would help, but the next day it did it again.

on the way home from work the following day probly 10 15min drive at most i got home and turned car off to hear a weird spool down noise from the turbo, that then turned into a gurgling noise from the intake i poped the bonnet to find coolant spray from my pod filter?????

the car didnt get hot or realy miss a beat except that start up issue i had.

the only thing i can think to explain it is maybe my turbo has an internal crack letting coolant get to the comp wheel?????

i have since pulled the turbo off to inspect looks fine but who really know so im thinking off sending it to garrett for warenty inspection, gonna cost me if its fine.

i have compression tested the motor seems ok and tested cooling system seems ok.

any other ideas anyone??????????????????????????

[Marlin]

Sounds to me like a warped head. Did you check it?

The coolant spray won't be from the compressor side, it will have come from your radiator or overflow and simply sprayed around by the wind.

If water is introduced into the turbo via any way, whether that be a leaking gasket, cracked head, or whatever, it can very quickly bugger your turbo. White hot exhaust wheels do not like cool (by comparison) water.

[Madaz]

Rings maybe sitting in the bottom of your engine or its mad lean

Who tuned the car and what boost were you running when the gasket let go

[pork hunt drifting]

morrie from horsepower in a box done the tunning it was running about 15lb then steped it up to 17lb when the headgasket let go.

the motor runs fine and compression is good so thinking clooant system or turbo. head was decked so should have good seal

[Madaz]

In my opinion 17psi shouldn't blow a head gasket but here is the caveat a lean tune will

[pork hunt drifting]

but even if ive blown the headgasket again how does that explain gurgling from the front of turbo.

are u trying to hint something about my tuner?

[Jap_star]

Steve isn't. But I will. 15 psi shouldnt Pop the head gasket unless there are underlying issues or a poor tune.

To give you an idea. My 33 makes 270@16psi on a mainline with the same turbo. Power seems fairly low.What pump and injectors ?

[pork hunt drifting]

pump n injectors standard. duty was at under 90%

[Jap_star]

Really???? Find that hard to beleive, if its true get some more fuel in there asap, you must at least have an adjustable fpr? @ 270 my injectors were 70 something and there nismo 555s

[Madaz]

yeah 250 on standard injectors is rather high

im @ 96-98% @ 240awkw mainline dyno

[dark.sky]

you can get 250rwkw out of stock RB25 injectors, this isnt the first time Ive heard it. Not something I would do though.

[pork hunt drifting]

the neo came out with larger injectors from what ive heard and the figures seem to show it.

ive just been upping boost and seeing what needs replaced first on a stock motor. i know its not the safest way to go but deffinetly the most interesting

the turbos been sent off now so if its not the problem well then at least its rulled out.

[Madaz]

NEO injectors are 370cc the only difference is they are top feed

[r33 chris]

only way ive heard of making over 260rwkw on standard injectors is aftermarket fuel pump and fuel reg and thats running them on the lean side

[dark.sky]

ask Damageinc, he had 250rwkw on stock injectors.

[Jap_star]

ask Damageinc, he had 250rwkw on stock injectors.

hes a bit special though.

dont see the point in spending the money on the turbo, tune etc etc and not having the safety of having enough fuel supply.

[pork hunt drifting]

but whats the point of having the injectors pump coilpacks afm and not having the turbo to boost it up?

my ways not as safe but more fun and interesting.

anyways i got the turbo back from testing and its fine. i comp tested the engine again and thats fine so im gonna put it back together and test the cooling system again. but im goin in for surgery on foot tomoz so that wont be for a few weeks. ill let yas no what happens.

im a bit shocked that the injectors are only 370cc are you sure?

still cant explain the gurgling in the turbo i heard through the intake???????????

[Jap_star]

but whats the point of having the injectors pump coilpacks afm and not having the turbo to boost it up?

my ways not as safe but more fun and interesting.

anyways i got the turbo back from testing and its fine. i comp tested the engine again and thats fine so im gonna put it back together and test the cooling system again. but im goin in for surgery on foot tomoz so that wont be for a few weeks. ill let yas no what happens.

im a bit shocked that the injectors are only 370cc are you sure?

still cant explain the gurgling in the turbo i heard through the intake???????????

yeah there 370cc.

cant see how it would be fun, after potentially 2 motors thats not the word id use to describe it, lol. doesnt seem that your issues are fuel related, but surely for peace of mind do injectors and pump while their off. still cant believe HPIAB let you wind the wick up on it,

[rad100]

you run BIGGER units for safety and head room.

im sure it wont be fun when you lean on your engine and it screws a ringland coz you wanted to play it fine..

m2c

[pork hunt drifting]

yeah ill be fitting injetors and pump as funds allow but for now thell have to do.

anyways enough slander about my lack of care for my bottom end.

what else could be causing my rough start up for short period and coolant where it shouldnt be isue?????