N1 Turbos Laggy

[mattblack]

hi all,

I recently had a PFC installed and retuned on my 32 GTR. Was previously running an eManage making 285rwkw and was getting around 420km per tank city driving.

With the PFC install the tuner leaned the tune out a little and got 311rwkw but now im seeing 320-340km per tank with very similar driving patterns.

Another situation im baffled with is the lag. Im getting full boost by 4600rpm with N1 turbos . Mods include 3.5Inch exhaust from front pipes back (std dumps), std internals, std cams, cam gears, Sard FPR.

Can anyone suggest some reasons why boost is coming on so late and fuel consumption is so crap now.

thanks heaps

[rtune]

in these situations you have to ask.. what changed.

From your description the only thing that changed was tune and possibly cam gears.

therefore unless (by sheer coincidence) your car developed a new problem right when the tuner had it, it must be the tune.

Did you get full dyno graphs before vs after including one showing AFR?

And btw your original power and consumption was very good for the mods you have, so I wonder what you were looking for in going PFC.

Edited April 22, 2009 by moneypit

[R31Nismoid]

Was it laggy before the ECU Change?

If so, its either actuators need upgrading/modifiying to hold shut

Or

They might be N1's with a .63 rear on each, if so then 4600 is as good as it'll get.

Otherwise the economy - probably related to the tune

[mattblack]

i changed to the PFC as im going to slowly increase the number of mods to the engine and was told the PFC is a better platform to do this. I got a good change over price too.

the car was laggy before as well. I will post up dyno graphs. The N1s are the factory fitted turbos on my car, its a genuine Nismo 32GTR so not too sure of the exhaust size.

Im thinking of fitting some Tomei Type A cams and dump pipes then getting a retune. what you think?

thanks for the advice so far.

[femno]

How is your boost curve?

Does it hit eg 14psi then slowly ramp up to eg 20psi, or does it bang up to eg 20psi and hold all the way until redline. You really need to know this first before anything else.

[mattblack]

nah it is pretty progressive from just over 2200rpm, 3000 4psi, 4000 12psi, 4600 19psi.

[bnr#@]

Factory R32 N1 turbos are fairly lagy so thats about right, they are old design non ball bearing turbo...

[raZ1911]

Could you go to another tuner just to see if they can see whats wrong with it?

[R31Nismoid]

Factory R32 N1 turbos are fairly lagy so thats about right, they are old design non ball bearing turbo...

Agreed Im not sure of the requirements/how/what setup they came on in the .63 either.

But ye, R32 N1's are the pits, hence R33s are better, and R34 N1's are the response monster for around the same power

Perhaps some more playing with the cam gears as if its stock housing N1's thats still a bit poor.

IMO cams wont give you much vs the $$$ you'll spend if at all.

[Duncan]

hi mate did you get anywhere with this?

I run the same turbos unfortunately and they are pretty bad. but with cam gears set right and a good tune you should be able to bring the boost on a bit sooner, mine is about 4000 for full boost which is still noticeable lag.

only real concern with your setup would the standard dumps. the rest of your exhaust is good but the standard 32 dumps are woeful and would not be helping at all.