Turbo Lag - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

rculley · 4th July 2005, 03:31 PM

Just had my stock turbo rebuilt with steel internals and a 360 thrust bearing etc. and whilst it's performing pretty well I seem to have a strange problem with lag. Basically the turbo begins spooling pretty quick but then it seems to gain a lot more power at 6000rpm and of course there's little room for this to be used before hitting the limiter.

I've tried all manner of different settings on the Profec B (including increasing the gain) but this has made no difference. I've also adjusted the actuator rod so there is a small amount of pretension and again no difference.

Just wondered if anyone had any other ideas what might cause this?

Cheers!

skylineman · 6th July 2005, 03:03 PM

Is it a gtst? if so I had my unit rebuilt, Mine is a bit slower on the spool up, but when I get to about 5500rpm it tends to hold back and at 6000rpm it goes well again. might not be the same problem but the people I go to said it may be fuel starvation, so bigger injectors and fuel pump. Dont hold me to it but mines always done this since I started tuning it. hope this helps

4th July 2005, 03:31 PM	#1 (permalink)
rculley GTR Register Member Join Date: Oct 2004 Posts: 32	Turbo Lag Just had my stock turbo rebuilt with steel internals and a 360 thrust bearing etc. and whilst it's performing pretty well I seem to have a strange problem with lag. Basically the turbo begins spooling pretty quick but then it seems to gain a lot more power at 6000rpm and of course there's little room for this to be used before hitting the limiter. I've tried all manner of different settings on the Profec B (including increasing the gain) but this has made no difference. I've also adjusted the actuator rod so there is a small amount of pretension and again no difference. Just wondered if anyone had any other ideas what might cause this? Cheers!

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6th July 2005, 03:03 PM	#2 (permalink)
skylineman GTR Register Member Join Date: May 2005 Location: northampton Posts: 174	Is it a gtst? if so I had my unit rebuilt, Mine is a bit slower on the spool up, but when I get to about 5500rpm it tends to hold back and at 6000rpm it goes well again. might not be the same problem but the people I go to said it may be fuel starvation, so bigger injectors and fuel pump. Dont hold me to it but mines always done this since I started tuning it. hope this helps