johno34

O.K then.

Good that you got a good deal. I didn't really want to buy second hand turbos if i could help it, if anyone was going to buy a dud set, it would be me! Yes, they are expensive to do up with steel wheels and hi-flow, i got quoted $850.00 each to do just that. What mods and power do you have with your GTR?

I did look around for prices everywhere i could find, obviously i didn't look hard enough. Where did you get your R34 N1's from for that price, thats very cheap from what i got quoted. Were they new, re-conditioned or used? Or........did they fall off the back of a truck?

Single turbo set up would be nice, but a HUGE difference in price to do it properly! I got a quote to change the internals and replace the ceramic wheels on my original standard R34GTR turbos and the price was higher than the turbos i bought. So in that respect, more performance with steel wheels is a bonus.........i think.

So in your opinion, i should check the cam timing? Besides that and the exhaust, i really can't think of anything else which could attribute to it being a significant amount of power down. Thanks again.

Yeh i know............coulda, shoulda, woulda. I was trying to improve it on a budget........the car does feel better to drive, and it does feel noticeably stronger mid range. These factors , plus i got rid of the worrying ceramic wheels, makes it good bang for your buck in my opinion. They were $1,000.00 cheaper than -7's. Like you said, they should have have more in them. Would adjustable cam wheels be a move in the right direction? My exhaust also has an offset front muffler which may be restricting it as well. So i might see about taking it out. Thanks for the input. My tuner did try increasing the boost, but the power gain in the cars current state wasnt advantageous in his opinion. i.e not worth the gain from the boost increase, i think he said 4kw for 1p.s.i of boost.

The turbos that were on it to begin with were the standard R34GTR turbos with ceramic wheels. The turbos i have on now apparently are a hybrid combination and have a 60.1mm O.D compressor and the exhaust turbine is 53.0 mm O.D. Click on the ebay link to see the turbos that are on it now. The turbos do take a little bit longer to come on, but they do have a stronger mid range with over 20kw atw more power. But you are right that in the top end they taper out. I just thought that they would've kept pulling at about the same rate as the factory ones, and kept that advantage right through to the redline.

Hi, I have been reading this forum for quite some time, but i needed to ask a specific question in relation to my particular car. I have an R34GTR, it has an aftermarket front pipe and exhaust. Hi-Flow cat, yellow jacket coil packs, pod filters, Apexi Power FC ecu, electronic boost controller, Hi- flow fuel pump with a nismo fuel reg and these turbos http://www.ebay.com....=item1c1cadc7d4 It also still has standard injectors and air flow meters. My question is this, in the cars latest tune, it has only achieved 260kw atw at 19p.s.i boost. This seems to be low to me considering that the turbos are supposedly rated to flow a lot more power than that. There is plenty of fuel and the injectors haven't been maxed out. I haven't got adjustable cam gears on it, i'm wondering if that would help? But i thought that they would mainly improve mid range. I have to say though that the car does have fantastic mid range power, but according to the dyno sheet, seems to run out of puff higher up. (As can be seen on the attached dyno sheet. Its the darker line 260kw atw run. Sorry about the quality) The exhaust didn't sound restrictive on the dyno, and the car wasnt missing at all and seemed to rev quickly and smoothly. The engine is also in excellent mechanical condition. In its previous tune the car achieved around 250kw atw on 1 bar boost with its standard turbos, it wasn't pushed any higher due to ceramic wheels. What do you guys think? Any constructive critism would be appreciated.Thanks.