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Worst Dyno Results Ever ?

djvoodoo

By djvoodoo,
in Engines & Forced Induction

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djvoodoo Experienced

djvoodoo

Posted
  • Author
Posted
as per my quote, ER34 ECU has excess airflow and boost protection, ECR33 ecu does not, so you are hitting the map sensor cut

and there is no R34 GTST

R34 GTT

R34 GTV

R34 GTR

etc

Yea cool cool, point taken. I'll take it like a man and admit I was wrong about the model badging.

NYTSKY Grand Master

NYTSKY

Posted
Posted
Lo boost on Greddy - gain 28% set gain 13% Start gain .46 gives me about 7.3 peak boost

Hi boost on Greddy - gain 38% set gain 18% start gain .55 gives me about 9.3 peak boost

Running "lo" boost is fine

Running "hi" = what you see on the dyno charts

Classic result of stock ECU interference. Get yourself an aftermarket ECU.

Weapon Mentor

Weapon

Posted
Posted

lol had same result with my old R33 GTST, made all of 99rwkw with a power line that looked like it was attached to a pogo stick... after market ecu in and hey presto 191rwkw and a much nicer driving car :down:

paulr33 Grand Master

paulr33

Posted
Posted

but there is a clear difference here

R33 has excess air flow cut

R34 has excess air flow cut and map sensor protection

you need to avoid both or "clamp" both to get the normal power gains when you add more boost

ie an safc or a piggyback to work around the excess airflow is ok, but the stock map sensor protection will still fire

run the map sensor protection into an expose vac line (so it always reads ambient pressure and never changes) and crimp the line (to stop vac leak)

that way when you boost it up, the ECU looks at the map sensor and only ever see's ambient pressure so it should never fire the excess boost protection

Toshi Proficient

Toshi

Posted
Posted

I remapped ecu for his car today and his problem fixed.

But his car is air leaking from somewhere so still AFR rich.(leaking noise from engine bay.)

I think around FMIC pipe.

Map sensor boost limiter start at 14psi.

So std turbo do not need remove limiter.( I think safer for std turbo)

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

mapping the car was a mistake.

why map a a car with a boost leak? the turbo is obviouly running flat out to try and keep the boost up as well.

then once he fix's the boost leak, usually the owners dont change any mapping or even get the car looked at... whats going to happen to the engine then ?

you should get the boost leak fixed then get toshi to check his tune. IMO

Toshi Proficient

Toshi

Posted
Posted
mapping the car was a mistake.

why map a a car with a boost leak? the turbo is obviouly running flat out to try and keep the boost up as well.

then once he fix's the boost leak, usually the owners dont change any mapping or even get the car looked at... whats going to happen to the engine then ?

you should get the boost leak fixed then get toshi to check his tune. IMO

He does not know ecu problem or another problem.

So I install remap ecu to his car then go to road test.

His problem is fixed by remap ecu.

But big air leak noise from engine bay on freeway.( he say this noise after install FMIC)

Also AFR very rich.

So I install base remap data to ecu this time.(did not tune)

My feel around 30KW more than before.

He will fix air leak his self ( because FMIC fitted his self) then he will come back to me for re tune ecu.

Harey Veteran

Harey

Posted
Posted
R34 has excess air flow cut and map sensor protection

What does it sound/feel like when it hits map sensor protection?

I am running a bigger turbo with 18psi but still on my standard turbo 10psi tune so am being very careful until its tuned. I gave it a little bit and it made a bit of a 'pop' noise. Was a little worried but everything feels fine afterwards.

STATUS Grand Master

STATUS

Posted
Posted
What does it sound/feel like when it hits map sensor protection?

I am running a bigger turbo with 18psi but still on my standard turbo 10psi tune so am being very careful until its tuned. I gave it a little bit and it made a bit of a 'pop' noise. Was a little worried but everything feels fine afterwards.

pop can be lean so take it easy :P

simpletool Mentor

simpletool

Posted
Posted

Airleak seems to fit well. The measured airflow would have been much higher than the 9psi boost would suggest. Hence getting well into the rich & retard zone of the standard map.

djvoodoo Experienced

djvoodoo

Posted
  • Author
Posted
Airleak seems to fit well. The measured airflow would have been much higher than the 9psi boost would suggest. Hence getting well into the rich & retard zone of the standard map.

Yea taking off all intake pipework and cooler pipework this afternoon. Will check all vac hoses and exhaust gaskets too. Will even try installing the SMIC and put the standard BOV back on too. I hope it's something very simple and easy.

Rolls Grand Master

Rolls

Posted
Posted
I am running a bigger turbo with 18psi but still on my standard turbo 10psi tune so am being very careful until its tuned. I gave it a little bit and it made a bit of a 'pop' noise. Was a little worried but everything feels fine afterwards.

Driving it at all is stupid if you've changed the turbo and more than doubled the airflow. Don't get it on boost at all.

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