Lean??? Stock SR Ecu and lean, help!

[Gavster]

Hey guys. First off, thanks for taking time to read this, here we go!

K, I went to the dyno the other day and I got a sort of nasty shock. Throughout the whole powerband, my car ran 13.8~14.2ish afrs to red line. Im running a completely stock ECU, Black top S13 SR with 8psi on a GT28R with the usual bolt ons (mani, FMIC, DP, Exhaust, etc). The car runs well, driving it around you'd never know. It pulls hard, and up to this point, Ive been beating on it pretty hard since January, lol and still the motor is holding together. The spark plugs dont look lean, in fact they are a nice mocha color like healthy spark plugs are. I just dont know what gives....maybe it was a fluke on the dyno. Im getting ahold of a wideband this afternoon to hook up and drive around with to make sure its really a problem or not. If it is still running lean...what do i look for? I mean im running a fully stock ECU, teh afr curve was sooo straight the tune held to the targeted afr well, it was just up 2 points to high lol....if the line it made had been ar 11.5:1 id be stoked it was so straight.

Im wanting some pre-emptive fuel insurace though. Im still on a stock fuel pump, and i have a fresh fuel filter in. Should I maybe get a walbro 255 or maybe something like a SARD FPR to bump up the fuel pressure and get some more gas in? I can only afford either the pump or the fpr at this time, so which should I get of the two and if not, what else should I look at?

This is really baffling to me as the car runs like a top....its so strange...if it was really *that* lean I figured I wouldve blown it months ago....HELP!!

[Gavster]

Stock fuel system BTW!

[Blown240sx]

Umm I believe the stock AFR for a stock SR is 14.1 unless its tuned that about what it should be.

[Cyberkreig]

Umm I believe the stock AFR for a stock SR is 14.1 unless its tuned that about what it should be.

Thats extreamly wrong. SRs run rich, 14.1 is not safe for any motor especially at high rpm. your average tuner wont push past 12.5.

Gavster --Not much of a mystery to this problem. I dont know why you would have an upgraded turbo and a stock fuel pump but that needs to change before you break something.

[DrifterProdigy85]

my vote goes to that stock fuel pump causing lean conditions. Get a Walbro and Nismo FPR. The Walbro will actually raise the Fuel Pressure of the stock FPR and youll run pretty damn rich, at least i did.

[otterman]

my vote goes to that stock fuel pump causing lean conditions. Get a Walbro and Nismo FPR. The Walbro will actually raise the Fuel Pressure of the stock FPR and youll run pretty damn rich, at least i did.

I heard it was really unsafe to not upgrade fuel pump when you do the swap specially if you're going to up the boost. I never heard the Nismo FPR thing though.

[highmilehatch]

Im still on a stock fuel pump

It amazes me the amount of SR's floating around out there that are just going to sh*t because of owner neglect. If you can spend thousands on the swap, you can afford another $100 bucks on a pump. Also, you don't need a FPR.

[otterman]

What will actually happen if you do run too lean and your motor has enough. I know its bad but what does running too lean actually do to the motor.

[highmilehatch]

Melted pistons, broken sparkplug electrodes, continual abuse from detonation to name a few.