Gt35r Injector size?
 

I went over to the local tuner. Talked about going single gt35r. He says that 550 primary and 1300cc secondary would be enough for a maxed out 35r? He also said that 1600 secondary 850 primary would be good. And then went on to say that I could just go 2000cc that way later on down the road I could upgrade to a bigger turbo and not have to change injectors. I asked him wouldn't 2000cc injectors be hard to tune for lowspeed on that turbo? and he says no since I am going with aem ems and it can handle high impedence. Either way. I don't really want to bother the guy too much cause I am just buying/building and planning my car at this point and he is very busy. So I have been researching injectors and id1600's are discontiuned cause of fuel starvation caused by hot fuel. It also seems that id1600's are modified boschs? And I don't really want to chance it if I can get something I don't have to worry about. So I was planning on getting a xcessive lim that allows 4 inj secondary. I could just use 4 id725's instead of two 1600's? It makes sense to me that this would be a better combo vs two big injectors but I really don't know for sure. What would you recommend? Thanks

what fuel pump?

I was planning on one of these rp pumps. Read somewhere that it is basically a new version of the supra pump and a bit more flow. Dont mind going with two pumps though.

Rotary Performance | FD Fuel System

with 550/1300 you'll max out your fuel system before maxing the turbo out i think

You will definitely max out your injectors before the turbo.

I have a GT35R with 550/1300's and my injector duty cycle is at high 70's at 15 psi with AFR's in the low 11's. IIRC the GT35R starts to max out at 22 psi...

the 550/1300 combo will be borderline before you even max it out, go with the 850/1600 for headroom.

i also would forget the supra pump, go with the stealth 340 or walbro 400.

hell go for broke.... get a Veyron pump lol

That must be what I need :scratch: lol What about the 4 smaller injectors vs two big?

Get this one :D What I am using for my TD-61 setup! Granted it sounds like a rocket ship about to take off lol.

Product Engineering Fuel Injection Pump - Turblown Engineering

Trying to avoid external pumps. But that is a monster.

550/2000 id with aeromotive stealth 340

Go with the bosch EV14 650CC primary and 2000CC secondary. They are high impedence already and cost $400 shipped roughly from the place I purchased for all (4) injectors.

550/1300 injector combo will be maxed out around 15psi( same with the RP pump).

Primaries;

Bosch Fuel Injectors ft. Bosch ev14 & High Impedance Injectors

Secondaries;

Injector Dynamics ID2000 - Turblown Engineering

You will want atleast the aeromotive 340lph fuel pum for gasoline. E85 will require more..

1300cc can get u around 19-20psi, but your duty cycles will be in the high, like 95-100%. Not maxed on a 35r but pretty close.

Ev-14 2200cc in the secondary holes would cover you easily, especially if you put some 750,850,1000cc primaries. If you can swing it, do this, as you can make 600whp+ on 1000/2200.


"I could just use 4 id725's instead of two 1600's?" Yes, but if you keep your primaries in as well you are pumping more fuel into your primaries ports than secondaries, a little unbalanced. Running six injectors gets a little more complicated (wiring) and some ecu's aren't designed to control 6.

What the hell is wrong with this thread's replies?

Upgrade ONLY your secondaries to EV1 1600's or EV14 2200's. That is all you need, leave your stock primaries alone. Don't waste your time with 1300's, you'll have to run unsafe duty cycles that will overheat the injectors which can cause them to stick and blow a motor.

Fuel pump, either aeromotive 340 or walbro 400.

thewird

Go with 1680cc or 2200cc. As for pump the Aeromotive 340 works well and will support the power.

I don't trust any walbro fuel pump...

https://www.rx7club.com/3rd-generati...odenso-939531/

to each their own i suppose.

the experience i have had lately with the Denso units was enough to push me to never trust one again. the Denso OEM supra TT pump i pulled out of the OEM box, checked to be sure it was original and was purchased from an OEM supplier, well.. the pump was run for about 7 months during the car's break in and it worked just fine. the car was trailered in to do the post break in tuning and the Denso pump started losing pressure with each pass after about 10 peak power runs, voltage was not an issue either. the engine wouldn't have survived had it not been for the soft apex seals or if it had started showing signs of failing just a little bit later than it did. that pump did push out a 494WHP run but while working on the upper maps the AFRs kept creeping higher and higher.

the walbro 400 we replaced it with has worked perfectly in the Denso's place for over a year and did a better job than the Denso did. the walbro 400 was also as quiet if not quieter than the Denso. i do know the walbros are less forgiving to heat(pump is cooled by the fuel in the tank) and voltage issues(read as voltage/amperage drops but they respond well to increased voltage, ie Kenne Belle BAP).

i've personally never seen a walbro fail, new or old. i have seen Denso units fail when you push them too hard, and not in the way you would want it to fail. i spent so many hours building that setup that i would have thrown a shit fit if a simple pump destroyed it all. luckily it was overbuilt to handle such issues. the Goopy seals, water/methanol AI and pinning held the series 5 block together with the 13.0AFR's@20psi on pump 91 octane it was seeing before i caught it. even a tad leaner and the engine would have been trying to twist like a pretzel.

I've found the supra pump draws a lot more amperage then any other pump out there which cause your standard 40 amp relay to overheat even if its a quality one. The more boost (fuel pressure) you run, the worse it gets.

thewird

was dying with 2 40A relays feeding it juice, both relays were cool to the touch and voltage was steady while pressure was dropping(went from 58psi down to nearly 30psi @85% duty cycle during the last pulls we were testing that pump with). i tried various things to make sure it was the pump and nothing else, first dyno session was canceled due to it, 2nd had the same result and we replaced the pump on the 2nd evening with the walbro and finished it out with plenty of fuel to spare after that from the pump.

i fault it to the kenne bell however, but it was only being cranked to 17volts. a pump should easily be able to handle up to 15 volts, showing the pump's borderline weakness.

many people will probably be ok feeding it battery voltage(without the boost a pump) and pushing sub 500whp figures.

on the other end the walbro 255 that came out of that same car was juiced up to that same 17 volts for several years pushing 450whp and was still working fine and is in one of my cars now, still doing its job. we went with the supra pump because the 35R was pushing more power than the previous turbo and knew it needed more than the walbro could supply even if we tweaked the boost a pump to full trim.

in my eyes the walbros are less tolerant of lowered voltages but more tolerant of increased voltages, the supra pump is more tolerant of lower voltages but less tolerant of increased voltages. and voltage/amperage is very important to a pump and its performance.

I suggest the aeromotive 340 as I just upgraded from the newest rp denso. Do the id 2000's in the rear and forget about it.