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222rwkw On Stock Boost

tigermm

By tigermm,
in Engines & Forced Induction

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STATUS Grand Master

STATUS

Posted
Posted
250rwkw is easily doable on the factory ECU trent - ben has done it on countless cars

i agree, just not on my dyno. Ive had plenty of std ecu gtr's on mine (about 17 now) and none have made anywhere near that unless remapped. i had one come close and that was dirk digglers (SAU member) he made 239 ish on a mines ecu.

tigermm Apprentice

tigermm

Posted
  • Author
Posted
yep soon as the restrictor is removed the std ecu pours in the fuel and dumbs it down. Most GTR's will pull around 190-200rwkw with a stock ecu, with a mines ecu they will pull around 220 (loads more timing about 29 degrees peak but still rich) a remap will yeild 230rwkw at less boost or 240kw with the restrictor removed and the remap controlling boost.... Sarumatix yours still has the highest reading on my dyno for a std rb26 so dont worry..... yet :)

Sweet, so mine seems ok then assuming its running 14psi.

I think the ecu is stock, doesnt have any stickers or anything on it.

Its running 11:1 afr by the time the boost peaks and goes down to 10:1 from there to the redline.

Can the timing be advanced from stock?

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
ROFL.

Yes, not saying it isn't ceramic but no one has actually proven it to be that.

Keep in mind that you are talking about dust, not chunks, and when a turbine wheel comes off, what happens to the comp wheel? It starts machining the housing away at the front. This creates dust also. What happens to alloy dust when you burn it? It looks like what you'd imagine ceramic to look like.

Theories of engines sucking blades back into themselves is a bit far fetched. Can happen, I'm sure, but you guys all make out like it's going to happen to every single GTR turbo that ever existed.

Thought you might like that one :D

Funnily enough actually the comp wheel actually seems to stay intact in most cases. I would agree this is a weird occurence being the shaft is now unbalanced and so on.

You would expect the comp wheel to make a fair meal out of the comp housing - i've personally seen 4 blow GTR turbos (one of them my own) missing just the rear wheel and zero damage to the front side of the turbo.

This again would defy common logic (shaft unbalancing etc etc).

They are not sucking the blades though, only small portions of it. I know i used a poor example in another thread where by you drop a glass and it basically shatters everywhere even though the force is going one way - similar to when a turbine lets go, totally depends i would imagine on where in the dump/exhaust flow etc that it decides to split into cosmic dust sized pieces.

Is that on an untuned car with just a cat back exhaust?

Well yeah dude, stock ECU means stock - ie no tune.

I had:

- Cam gears

- Stock dumps

- Custom 2.5" x2 front pipes that merge...

- Into 3.5" exhaust

- GT-SS turbos, 12.5psi

That is all i needed to make 250rwkw on the stocker ECU @ Racepace. Ben said at the time it was a pretty solid result compared to the majority which usually required around 14-15psi for similar results.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
i agree, just not on my dyno. Ive had plenty of std ecu gtr's on mine (about 17 now) and none have made anywhere near that unless remapped. i had one come close and that was dirk digglers (SAU member) he made 239 ish on a mines ecu.

When i get my car back i'll do the rounds (ill attempt to do it the same day).

I'll hitup Dr Drift, you, Racepace and RE.

See if in one day, how/where the results vary, would be a very interesting thing to do i reckon

Adriano Grand Master

Adriano

Posted
Posted

I would have thought once the exhaust wheel has exploded, the turbo stops spinning, as there is nothing to drive it, hence why the comp wheel is fine. If it was chewed comp wheel/housing on the pistons, then it would be on all the pistons, not just the corresponding three to the blown turbo.

tigermm Apprentice

tigermm

Posted
  • Author
Posted (edited)
Well yeah dude, stock ECU means stock - ie no tune.

I had:

- Cam gears

- Stock dumps

- Custom 2.5" x2 front pipes that merge...

- Into 3.5" exhaust

- GT-SS turbos, 12.5psi

That is all i needed to make 250rwkw on the stocker ECU @ Racepace. Ben said at the time it was a pretty solid result compared to the majority which usually required around 14-15psi for similar results.

Well dude, your stock ecu could have a daughter board in it, therefore be tuned, I dunno. Thats why I specified untuned rather than just factory ecu.

Also I dont have cam gears, front pipes, or a couple of grand worth of turbos. I was a bit worried I was down on power when you said it should be 250.

Given this Im thinking 222kw is probably ok for a stock car with just the catback.

What I really wanted to know is if my engine is making normal healthy GTR power.

Adriano, I was thinking the exact same thing. even if the turbo did start chewing the housing it would stop pretty damn quick, and yeah the ali would be thru the whole engine most likely.

Its weird cause I have never heard of other skylines doing this and they all have ceramic wheels. Maybe its that GTR manifolds are a lot shorter?

I ran my GTS4 with a GTt turbo at 15psi for years and never had an issue. Even managed a 12.995 1/4 with it at 18psi

It would be interesting to know how many of the turbos that fail are on cars with aftermarket BOVs which are adjusted to build more pressure before they open.

I was reading that thread which was linked earlier and one guy said his failed when he changed gear, and another said his was after a drag run. Both are times when the throttle has been snapped shut so there would be a lot of pressure built up on the intake side, and still a lot of gas flow and inertia on the exhaust side.

That would mean a sudden spike in the torque being applied to the turbo shaft and it might be why the wheel drops off.

My GTS4 always had the stock BOV on it.

Edited by tigermm
GDZ-14R Rising Star

GDZ-14R

Posted
Posted (edited)

I must admit i was a skeptic until i saw the pic of the piston on the exhaust side with all the little 'chips' in it. We can all speculate the laws of physics, but the pic is pretty conclusive...

ceramic.jpg

To give you something to compare against, i was pretty disappointed when my healthy R34 GTR made 210awkw last week, with Power FC, 2.5" front pipes, cat, 3" catback, pods, and 14 psi (200awkw on 12psi too). It does feel tough though, so don't be too fussed with the numbers too much if the car feels solid..

Edited by ELZ-00R
Duncan Grand Master

Duncan

Posted
Posted

well I think 200-220 is about right for a standard gtr with standard turbs. ash's example had aftermarket turbos is it is not relevent to the discussion.

a little bit of realism is a good idea, everyone reading this thread will think every stock gtr makes 250kw when 99% of them make 20% less than that. and the 1% that are making 250 are either bullshit, not standard ecus, not standard boost or not standard turbos.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Well you would need 250 to run a mid 11 in a 32GTR (street tyres), i know a car that has indeed achieved this, and a few that have come close.

So some people are making around that much.

Proof is in the pudding, or the 1/4 mile in this case.

STATUS Grand Master

STATUS

Posted
Posted (edited)
Well yeah dude, stock ECU means stock - ie no tune.

I had:

- Cam gears

- Stock dumps

- Custom 2.5" x2 front pipes that merge...

- Into 3.5" exhaust

- GT-SS turbos, 12.5psi

That is all i needed to make 250rwkw on the stocker ECU @ Racepace. Ben said at the time it was a pretty solid result compared to the majority which usually required around 14-15psi for similar results.

HAHAHA no wonder GT-SS's make all the difference, i was talking std ECU and STD TURBOS. The std ecu runs around 24 peak degrees but can handle 3-4 more, it is also mega rich from about 5500 so you could get away with around 12-15psi on the std gtr ecu.

Edited by URAS
STATUS Grand Master

STATUS

Posted
Posted
When i get my car back i'll do the rounds (ill attempt to do it the same day).

I'll hitup Dr Drift, you, Racepace and RE.

See if in one day, how/where the results vary, would be a very interesting thing to do i reckon

Yeah definately, it wont cost you a cent on my end. We have had a few guys do comparos now from the melbs15 club so ive nothing to hide. I think even STAO from hyper gear drove from DRDRIFTS to mine and pulled within 2-3rwkw on his old CA dyno test car, he didnt tell me either till after we pulled the runs :P

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