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R33 Nissan Skyline Gt25t Boost Problem

ICE_BlooD

By ICE_BlooD,
in Engines & Forced Induction

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ICE_BlooD Apprentice

ICE_BlooD

Posted
Posted

Hi

first i change the intake manifold to greddy intake copy and the throttle i put 80mm one whit other Nissan TPS, but right now the car make boost stop and it never make boost with the car stop.

when i press the accelerator fast it make 7 psi of boost. it is a problem o its normal?

paulr33 Grand Master

paulr33

Posted
Posted

it would be unlikely you can make 7psi boost sitting there

i'd suggest you have some sort of leak, vacuum issue or your reading the guage wrong

where are you seeing 7psi boost at "stop"

on the standard guage?

please tell us what you see

shaunvlc Enthusiast

shaunvlc

Posted
Posted

we would need some sort of translator to understand what you just said. boost is generally made when the car is under load. ie when you are driving the car. reading the guage whilst revving the car is not accurate. What guage are you using? I run an autometer guage which is quite accurate. however the stock guage is terrible, some may work fine but mine is very inaccurate.

Benzino33 Experienced

Benzino33

Posted
Posted
Hi

first i change the intake manifold to greddy intake copy and the throttle i put 80mm one whit other Nissan TPS, but right now the car make boost stop and it never make boost with the car stop.

when i press the accelerator fast it make 7 psi of boost. it is a problem o its normal?

wha?

ICE_BlooD Apprentice

ICE_BlooD

Posted
  • Author
Posted

sorry for my bad english, really sorry

i have an autometer phantom gauge, and have a Nismo Cluster, the car made boost whit the car not load, with the shift in neutral i press the accelerator and it make boost.

but before it never made that. the only thing i change was the intake manifold, TPS and throttle to 80mm.

Benzino33 Experienced

Benzino33

Posted
Posted
sorry for my bad english, really sorry

i have an autometer phantom gauge, and have a Nismo Cluster, the car made boost whit the car not load, with the shift in neutral i press the accelerator and it make boost.

but before it never made that. the only thing i change was the intake manifold, TPS and throttle to 80mm.

Well if ur sitting and rev ur engine to or close to redline it should go onto boost, but probably not by much at all, enough to make it dose though lol.

Maybe coz of ur mods ur car's letting in more air and creates a bit of boost even wen its not on load/in gear while driving

ICE_BlooD Apprentice

ICE_BlooD

Posted
  • Author
Posted
Well if ur sitting and rev ur engine to or close to redline it should go onto boost, but probably not by much at all, enough to make it dose though lol.

Maybe coz of ur mods ur car's letting in more air and creates a bit of boost even wen its not on load/in gear while driving

thanks

some people tell me it can make 1 or 2 PSI but it make 5 or 6 psi of boost and the boost controller is set to 7 psi. i think is irregular that car retard a lot the ignition.

why the car now is retarding the ignition when its not on load/in gear.

Benzino33 Experienced

Benzino33

Posted
Posted
thanks

some people tell me it can make 1 or 2 PSI but it make 5 or 6 psi of boost and the boost controller is set to 7 psi. i think is irregular that car retard a lot the ignition.

why the car now is retarding the ignition when its not on load/in gear.

Yeah 5 to 6 is pretty high. at how much rpm does it make this boost?

Yeah lke Paulr33 said, i'd check for some kinda leak. u got a stock ecu?

ICE_BlooD Apprentice

ICE_BlooD

Posted
  • Author
Posted
Yeah 5 to 6 is pretty high. at how much rpm does it make this boost?

Yeah lke Paulr33 said, i'd check for some kinda leak. u got a stock ecu?

i have:

- a stock ecu,

-Blitz intercooler (well i change the intercooler pipe to 3" in the intake side and the turbo side it's 2.5".)

when you say leak what kind of leak do you refer?

i see the boost at 5000 to 6000 RPM

PsYLoR Collaborator

PsYLoR

Posted
Posted

They mean an air leak somewhere.

Just a stab in the dark, but with the new manifold setup and new TPS could the ECU being reading things wrong and think its under more load than it actually is?

Is the car driving/boosting normally under load?

Have you reset your ECU since you made the changes?

ICE_BlooD Apprentice

ICE_BlooD

Posted
  • Author
Posted
They mean an air leak somewhere.

Just a stab in the dark, but with the new manifold setup and new TPS could the ECU being reading things wrong and think its under more load than it actually is?

Is the car driving/boosting normally under load?

Have you reset your ECU since you made the changes?

yes the car drive and boosting normally, i think something is retard the ignition time and for this the car is boosting with not load.

Reset= i take out the battery for few minutes and put it again.

i have to do another reset?

could the TPS with more voltage than before retard the ignition?

after the TPS have 0.22 close and 3.97 open, now have 0.55 close and 4.XX open.

PsYLoR Collaborator

PsYLoR

Posted
Posted

You can reset 3 different ways, by unplug battery and depress the brake peddle a few times when unplugged to drain any remaining power. Or you can do the reset/diagnostic by bridging the consult port or by turning the screw on the ECU itself to run diagnostic test & reset. do some searching. But if you did that already you shouldn't have to again.

I cant say about the effect the TPS voltages could have, thats beyond my knowledge. Hopefully someone else can answer that.

ICE_BlooD Apprentice

ICE_BlooD

Posted
  • Author
Posted
You can reset 3 different ways, by unplug battery and depress the brake peddle a few times when unplugged to drain any remaining power. Or you can do the reset/diagnostic by bridging the consult port or by turning the screw on the ECU itself to run diagnostic test & reset. do some searching. But if you did that already you shouldn't have to again.

I cant say about the effect the TPS voltages could have, thats beyond my knowledge. Hopefully someone else can answer that.

Hi

today i do:

1- Reset the Stock ECU

2- check the check engine led the only code is 55- No Malfunction

3- my ecu dont have a screw dont red led and green led dont know why

4- the timing is 15 grade

5- i conect a Emanage Ultimate and record the data log if somebody want help i can send.

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