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Turbo Operating Effieciency

Pattygtst
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Pattygtst Veteran

Pattygtst

Posted
Posted

Hey all

Here are my mods

3"turbo back exhaust

pod

eboost 2

fmic

Had my boost set to 14psi at xspeed. It got 239hpatw. The car felt bad when driving was getting spikes, jerking etc. I told them about it and they said it should be fine we do it at 14 on stock turbo no a/m ecu all the time. They told me my probs would be coil packs, i thought maybe but i believed it was the ecu going nuts on 14psi. So i took it back in and asked to put it down to 9psi, to there credit they did it for free as i complained from previous boost set. Well it got 270 hpatw on 9psi with no probs and a decent curve, was very please car feels wicked now. So the dyno tune notes said my car was obviously out of it turbo operating effiecncey. Now i d ont really understand this comment, as the car i got imported completely stock had 60,000 genuine kms service records and car condition to match. So i don't believ the turbo is not working properly.

What are your thoughts??

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R31Nismoid Grand Master

R31Nismoid

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Posted

Operating efficiency is where the turbo reaches its airflow limit.

After that, running more boost doesn't make any more power, just more heat which in turn will hurt power.

Anyhow, whats happening to YOU is the factory ECU having a fit (nothing to do with the turbo/efficiency)

1. 14psi is silly on a stock turbo. You will kill it.

2. 10-12psi generally makes the stock ECU have a fit causing a power hole around 4000rpm and so on, and your running more than that.

Backing off to 9psi, making more power is a dead give away for the ECU fit.

But having said that, 9psi you aren't making a legit 270rwhp, that figure is inflated. It's more around 240.

The workshop telling you that they run 14psi on all R33's is a great worry. The obviously don't realise the turbo combined with that amount of boost will kill the turbo... so i'd be worried about what other basic common knowledge they don't know about - which would be enough for me to take my car elsewhere.

msnismo Grand Master

msnismo

Posted
Posted

^^^ who... sorry but I'm not feeling that figure!

What turbo? No SAFC or similar No FPR? Upgraded coils? AFM?

On my highflow with stock ecu (mines chipped) SAFC and 14psi I made 230rwkw.... SAFC just didn't have enough tuning points to increase the boost and keep it safe.... That was a mainline dyno, with splitfires, E-01 and a Sard FPR..... FMIC etc as per the usual...

Edit: Stock injectors are what 370cc.... they would be maxxed out and thats if they are still flowing like they were when they were new.

Pattygtst Veteran

Pattygtst

Posted
  • Author
Posted

Yes i wont be going back there, even though i said i would, i did just to get them to fix it for free. But dead set they say the its perfectly fine and they do it all the time no probs.

Anyways will be using hyperdrive when i get it tuned. I spoke to other tuners and they agree with what you said about 14psi

Thanks for the quick informative replys

Munkyb0y Grand Master

Munkyb0y

Posted
Posted (edited)

i'm pretty sure guilt-toy was joking :P

theres some debate about 12psi vs 14psi on the stock turbo.

maybe we can get some actual results from those who have tried.

did it make any more meaningful power? did the turbo last? etc etc

Edited by Munkyb0y
Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted
^^^ who... sorry but I'm not feeling that figure!

What turbo? No SAFC or similar No FPR? Upgraded coils? AFM?

On my highflow with stock ecu (mines chipped) SAFC and 14psi I made 230rwkw.... SAFC just didn't have enough tuning points to increase the boost and keep it safe.... That was a mainline dyno, with splitfires, E-01 and a Sard FPR..... FMIC etc as per the usual...

Edit: Stock injectors are what 370cc.... they would be maxxed out and thats if they are still flowing like they were when they were new.

Seriously.. runs a stock rb25 computer with stock injectors. made 268rwkw or something.. I know because I ran the car up on the dyno!

Runs a GT30 and a RB30DET and a decent fuel pump and a FPR, he has tricked the computer to not go into R&R.

HP maybe but kw, no way

Yes KW. I ran it up on the dyno myself

i'm pretty sure guilt-toy was joking :P

theres some debate about 12psi vs 14psi on the stock turbo.

maybe we can get some actual results from those who have tried.

I usually like to joke about funny things... I am dead serious!

joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted

i've been running the gauntlet for a year now on 12-13 psi with an occasional spike to 15-16 on a stock turbo...

the car hits 6k very often and is well looked after. tune was done by nige @ racepace

the hks turbo is in the box waiting for time for the install

msnismo Grand Master

msnismo

Posted
Posted

14psi = kaboom :P

12psi was run on my stock turbo... never a drama and I think Mitch (Mrmoo) who is the current owner of that turbo is still running 14psi on it..... could be a freak though or extremely lucky!! It made over 200 rwkw at the dyno day from memory.

My mate runs 16psi on his stock 32 turbo and has done so for over a year!! It cops a flogging, but still keeps going, I just think he is damn lucky!

Pattygtst Veteran

Pattygtst

Posted
  • Author
Posted
i've been running the gauntlet for a year now on 12-13 psi with an occasional spike to 15-16 on a stock turbo...

the car hits 6k 7 days a week and is well looked after. tune was done by nige @ racepace

the hks turbo is in the box waiting for time for the install

Maybe your ecu is on ICE

msnismo Grand Master

msnismo

Posted
Posted
Seriously.. runs a stock rb25 computer with stock injectors. made 268rwkw or something.. I know because I ran the car up on the dyno!

Runs a GT30 and a RB30DET and a decent fuel pump and a FPR, he has tricked the computer to not go into R&R.

hang on so its a 3.0L or a 25/30??? Guessing 25/30 to be running the ecu??

Still having issues re the stock ecu running that turbo and afm with no dramas with no help from a fuel computer.... guessing its running a fuel cut defender and relying on the FPR heavily .... and don't get me started on R&R :P ....

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

No feul cut defender. RB25/30.

The guy worked out a combination on how to skip the fuel cut & R&R.

here is a quote from his thread

For those interested in what the Std ECU can do, Guilt-Toy did some Dyno power runs for me today and results are as follows:

Dyno Dynamics Dynamometer at TurboTechnics Cardiff...

Run 1. 230rwkW at 9psi with AFR = 12.1

Run 2. 265rwkW at 11psi with AFR = 12.2

Run 3. 278 rwkW at 13 psi with AFR = 12.5

Didnt attempt any more boost...I was already happy enough!!

On Run 2 and Run 3 there was a little bit of ignition breakdown due to stock plug gap (didn't have time to regap plugs) but apart from that it was all cool...No sign of airflow cut or anything else scary

And also no-one heard the screamer pipe!!!

Will post up charts once scanned as well as Nissan Consult data...

Thanks Guilt-toy!!! Power FC master!!! and soon to be Std ECU master!!!

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