What boost can stock RB26DETT injectors handle?

[ghost_22_47]

Ok so the reason I'm asking is because my RB26DETT on stock twins are pushing 15psi and I'm getting a fuel cut and misfires at WOT. I know 15psi is grenade level on these but the reason I want to know if my injectors can handle it is so I can find the cause of the fuel cut and misfires. I will be driving it causiously so I don't blow the wheels but if the injectors can't handle this pressure then it tells me I need to do my upgrade setup. If it can handle it then there is another issue in something else.

If it is the injectors I will be upgradeing to 720cc injectors, 300zx MAFs and twin GT2871R-10's and tune accordingly.
Any questions on the setup here is my shortened version of my build thread but the parts list isn't right anymore. http://forums.gtrcanada.com/media/44...nvertible.html

Thanks

[Bruizer]

Stock injectors are good for something 400hp if I remember right. I ran 1.2bar on my stock turbos and injectors. As for -10s, those are a bit too big for RB26 and will shuffle away a fair bit. That seems like a bit much power for a rwd convertible. The shuffle from the large turbos will also cause issues to your MAFs. IMO, if I was putting a twin turbo in my 240, I'd go twin SS or GT2510 because the power is more linear and easier to predict. Power that suddenly kicks you out sideways isn't much fun...

Why didn't you go RB30 or RB24? The weight of the RBs is much higher than KAs, CAs, SRs and even LS V8s, you would get more benefits ALL AROUND by going to a V8 Then you don't need turbos and will be able to do doughnuts without the cost of going RB.

I'd guess ignition issues. Checked your plugs/gaps?

[ghost_22_47]

See that was my next stop after the injectors was my timing. when it misfires and cuts the fuel, my Nistune shows me 25* under full load. Basicly once I see the TPS volts at 2.7-3.0 thats when it begins the misfireing.

I have replaced the plugs and lowered the gap, tested the coils resistance and replaced and swapped around, swapped my igniter pack, checked for vaccum leaks, checked for proper operation and voltage of the TPS in all ranges, cleaned and swapped the MAFs, tested the O2's for continuity to the proper bank, changed my TP load to max, raised my maximum TP width to 17.5, and tested various sensors for proper operation and voltage readings. All to no change

[DreadedFist]

Turn down the boost and see what happens.

[ghost_22_47]

Unfortunatly I can't. No boost controller and they are for whatever reason staying at 15. I think I could use the threaded arm on the wastegate to adjust them but they are old a rusted and would probably break.

[needavdub]

I run 15.5 psi on steel wheel'd stockers with stock injectors. It pulls like a freight train with AFR's around 11.9:1 at WOT, so it's getting enough fuel. I used to have problems with chugging/missfires at WOT at anything higher than stock wastegate boost (10psi), a set of Yellow Jacket coils and fresh plugs solved my problem. For what it's worth, I used to have to change plugs with every oil change to get it to run well until I got the hotter coils, so if you're running stock coil packs that may be your problem.

[ghost_22_47]

I think Yellow Jackets are my best next step, I have researched them and NOONE has had a failed coil yet with them and everyones spark breakup was fixed with them as well. Also being cheaper than Splitfires doesn't hurt either. Thanks

[needavdub]

Yeah get in on the current group buy through performance-wise. They're cheap and the seller is great, fast shipping and excellent communication.