I need HELP!!!!

[bdogssky]

Ok guys, so just bought my 2001 GTR with the RB26 motor. It was backfiring a lot and had a lot of hesitation in higher rpm's while driving. I read that your plugs make a world of difference. So I pulled out the old plugs which were platinums at a heat range of 5 and a gap of 1.1mm. I installed the NGK Irridium IX at a heat range of 7 and a gap of .8mm. so it still backfires when you let off of it and is smokin a bit.....kind of thinkin maybe an injector or ignition system problem or I could be way off......any help from experience would be great. Also the stock GTR monitor in the dash is all in Japanese so I have no clue how to fine tune this car. any way to change that into english??? Once again, any help would be awesome!!!!

Brian.....confused GTR owner

[Gold Digger]

Can't help you with the back firing, but what I can help you with is the display. It's only Japanese, there is no way to change it. It's also just for monitoring and you can't do any tuning with it.

I can't remember what buttons there are, but one of them is the button that switches between the different displays. Can you take a picture of the buttons? I may be able to help you out on what button does what.

[akwikz]

Sounds like a fuel issue. When I first swapped an RB26 into my '73, it did the same thing. I found it was low fuel pressure. It would idle fine and run well at low throttle, but when you opened it up it would buck and backfire. I had installed an aftermarket fuel regulator and had it too low. I cranked up the pressure to 45-50psi and it ran perfectly. That should be pretty much the factory range I believe.

Brian