read some older posts about injector sizes, including simons thread a few months ago, and found the results clear as mud. to make it a simpler question i wanna know whats gonna be my weak point (in terms of HP). running fully rebuilt TT, gt600r turbos with ams manifolds and 3inch split dumps, POSSIBLY bigger cams, 555nismo injectors, walbro 255L pump... will the 555s cut it? and what about the $100 fuel pump? and is one of them 300deg rails gonna give any benefits? cheers
so even with aftermarket cams and boosting the t28s right up they will still handle it sweet?? just that heaps of ppl said yes and heaps said no lol cheers
Fleet was running them in his 400rwkw race car with a bit more fuel pressure. He had 28RS's and cams.
615's are SARD's and they need collars to make them fit in the fuel rails. I'd go the Nismos as they just work.
Ah, sorry, getting mixed up with the 650's. Those are for the '95+ zeds. You will need the later model lower plenum (and maybe fuel rail). Hard to find.
ye and the kit with the adapter is cheaper than the 555s lol. bang for buck i see no other reason why not to go bigger really... just run lower % when tuned
I have a motor sitting on a stand (the theory is it will last longer on the stand) to the same spec you intend, the 555's with 10 PSI extra should cut it(55psi) running up to 85% duty cycle, if money isn't an object I would of gone the series II 555/615, its an extra $425AU odd,($500 plus when I bought), but I think the douche works and collars are cheaper. Try this website, with 500 flywheel HP, 6 injectors, BSFC .625, Max duty cycle 85%, gives you 643 cc. Old pressure 43.5, new pressure 55, gives new flow of 624 cc. http://www.witchhunter.com/injectorcalc1.php4 I haven't tried this yet, but I believe there is reasonable fat in these calculators as well, no doubt it will be tight but possible, unless your shooting for the full 600HP the turbos are quoted at, then you have the wrong injectors, and your probably better off with the GT28RS turbos instead.
Don't forget with a rising rate fuel pressure regulator you get 1 psi of extra fuel pressure with every psi of boost. No need to up the base pressure at all. All the tuning should be done inthe ECU. Just turning up the base pressure is a bodge
"Just" turning it up is a bodge, but obviously you tune your ECU using the extra flow rate arrived at by increasing your fuel pressure. Probably a good idea to clarify that. thanks. Nistune is what I am using.
In good condition yes, quoted here at 700HP capable, http://www.conceptzperformance.com/Cart/description.php?II=1246&Car_Type=NIS300&UID= But if I was building 500HP plus at the flywheel I would be looking to upgrade. There are some nifty graphs that show how the OEM pump flow falls away at pressure and what I suggested above is within this with a small headroom, ie it wont go much further. Particularly with the 10 PSI increase on the series 1 555's, probably go to 600HP at the fly with series 2 740cc at stock fuel pressure. Here it is: http://www.stealth316.com/2-fuelpumpguide.htm
Are you holding it hostage until The Price is Right ? Ta give it to Eric next time you are giving him a service.
