My turbos built the pressure perfectly but my car runs really bad.

I have already cleaned and checked almost everything (TPS, coils, O2, fuel pump, timing, boost leak,...).

I have strange values with Datascan and the Profec.

 

Profec E-01 :

in "car select menu : speed meter pulse", if I enter "2" (the right value for the Z32, as with the AVC-R), the boost controller gives a wrong RPM (too high).

If I enter "4", I read the right RPM values...

 

Datascan :

at WOT, the airflow never gives more than 3 volts (instead of 4.5 volts) and 35% of injectors duty cycle.

I'm not always 'rich' under acceleration.

My iddle is not perfect (variation of 60 rpm).

My timing is 15° at iddle, but ~40° at WOT (but it seems logical : in the 'timing map', I see that the timing is high at high revs if the load is low).

 

Any idea ? I have already discussed with a lot of specialists (TTnet, racing stores, ...) : nobody undertands !

For information : I have new engine, new dual pop Xstream with JWT program, new single MAF, new EFI harness, new PTU, new Greddy TD05, new Nismo 555, ...

hi Alex and welcome to the club.

 

crikey most of that is over my head and hopefully a techie can answer your questions, but how do you know the E-01 is reading the wrong RPM? dont forget stock gauges are usually rubbish after a few years, my ApexI RSM reads RPM as slightly higher than the stock gauge does all the time.

Datascan :

at WOT, the airflow never gives more than 3 volts (instead of 4.5 volts) and 35% of injectors duty cycle.

I will check mine tomorrow

I'm not always 'rich' under acceleration.

Mine goes from rich to lean and back again a few times during acceleration.

My iddle is not perfect (variation of 60 rpm).

Normal (although should'nt be noticable without datascan)

My timing is 15° at iddle, but ~40° at WOT (but it seems logical : in the 'timing map', I see that the timing is high at high revs if the load is low).

Thats Normal

What is the nature of the poor running? misfire , lumpy,hesitant or just low on performance?

 

A bit more info will help.

 

Jeff TT

just to backup what Legrath said, car goes from rich to lean as you move up the rev range - most R.R. graphs will show that (although of course there is TOO rich and TOO lean). idle variation of 60rpm is pretty stable if you ask me! hope we can answer the rest of your questions.

>> new dual pop Xstream with JWT program

 

bad combo...JWT is programmed for a fully divided intake.

 

>> at WOT, the airflow never gives more than 3 volts (instead of 4.5 volts)

 

with a dual intake/single MAF system you won't get 4.5Volt unless you have MEGA power.

 

I see you're in Belgium and since I work for DTA-motorsport in Holland and we have our workshop not far from the Belgium border, you might want to come round to have us look at the problem you're experiencing ?

 

You can contact me/us at info@dta-motorsport.com

 

-Eric

hi Alex and welcome to the club.

 

crikey most of that is over my head and hopefully a techie can answer your questions, but how do you know the E-01 is reading the wrong RPM? dont forget stock gauges are usually rubbish after a few years, my ApexI RSM reads RPM as slightly higher than the stock gauge does all the time.

 

I'm sure E01 gives a wrong reading : when shifting at 7000 rpm (according to stock gauge and Datascan), the E01 gives 9500 rpm !

What is the nature of the poor running? misfire , lumpy,hesitant or just low on performance?

 

A bit more info will help.

 

Jeff TT

 

Just very very low on performance : lower than stock ...

I had ~ 530 rwhp with the same upgrades on my previous engine ; now I estimate ~ 200 rwhp !

 

With Datascan, the 'fuel map' trace shows this low performance : impossible to go in the 'high load' part (right side). I always stay in the left side of the map.

Just very very low on performance : lower than stock ...

I had ~ 530 rwhp with the same upgrades on my previous engine ; now I estimate ~ 200 rwhp !

 

With Datascan, the 'fuel map' trace shows this low performance : impossible to go in the 'high load' part (right side). I always stay in the left side of the map.

 

 

 

530 :shock:

...just a gut feeling - but sounds like the MAF - can you swap it out?

 

AndyGP

>> new dual pop Xstream with JWT program

 

bad combo...JWT is programmed for a fully divided intake.

 

>> at WOT, the airflow never gives more than 3 volts (instead of 4.5 volts)

 

with a dual intake/single MAF system you won't get 4.5Volt unless you have MEGA power.

 

I see you're in Belgium and since I work for DTA-motorsport in Holland and we have our workshop not far from the Belgium border, you might want to come round to have us look at the problem you're experiencing ?

 

You can contact me/us at info@dta-motorsport.com

 

-Eric

 

I have tried with the original JWT dual pop intake, the problems are exactly the same.

I can't find anybody in Belgium for my problems, so I'll visit you.

...just a gut feeling - but sounds like the MAF - can you swap it out?

 

AndyGP

 

I'm not sure to understand what you mean (my english is poor!).

Concerning the MAF, here is what I have tried, without benefits :

- put the MAF on the other filter.

- test with a new MAF.

- test with the original JWT dual pop, instead of the Xstream.

- test without the 2 filters.