NBs' please help. What to do about fuel?!!?
Ok, so, here's the story. I have a custom DSM 14b setup on my 99 NB and it is running fine, that is until it tries to boost. I've come to the conclusion that i'm starving it of fuel and the knock sensor is only doing it's job. I have the EMB with Ignition and Injector harnesses connected and that is the only type of fuel mods I have done so far. I understand completely (in hopes that no one thinks i'm some kind of newb to the turbo world) that I need to upgrade my fuel system more. I also understand that it is a returnless fuel system and an AFPR is out of the question how the car is stock. Has anyone converted our system into a return type system? What are some of you guys' out there running as far as a fuel setup goes? Bigger pumps? Bigger injectors? I've been working on this project trying to get all my custom pieces together for about 6 months now and in my own ignorance, never really did any research on the fuel system upgrades. Please, anyone that can help me out without "newb bashing" me, it would be greatly appriciated! Thanks in advance.
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Is this something that an O2 clamp would help?
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Throw something bigger than 240cc injectors in there. the EMB can handle something like 30% larger injectors, so a 330cc injector. That would at least get you to the 180rwhp range. Right now you can really only support 130rwhp.
I'd also invest in a WBo2 so you don't just think it's starving for fuel and you know it's starving... |
Originally Posted by cjernigan
(Post 89282)
Is this something that an O2 clamp would help?
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I have a close friend that does dyno tuning with a wide band, but, I don't want to put it on the dyno unless I know everything is right and ready to go. what about fuel pumps? Is that necessary? When it boosts (or tries to boost) it just falls on its face, i'm guessing because the knock sensor is cutting it back?
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Originally Posted by yadayada
(Post 89286)
I have a close friend that does dyno tuning with a wide band, but, I don't want to put it on the dyno unless I know everything is right and ready to go. what about fuel pumps? Is that necessary? When it boosts (or tries to boost) it just falls on its face, i'm guessing because the knock sensor is cutting it back?
Can you post a base map? |
your running at 60psi, your pump should be perfectly capable of handling that and supply more than enough fuel.
the pump has nothign to do with fuel, only if the injectors will be supplied enough or not. so lets take that out of the equation. next step is the injectors...currently they are 240cc, which run at 265cc or so at 60psi. that's good for about 130rwhp. I can see the knock sensor cutting you back as soon as you hit around 1-2psi. if you throw in 330cc injectors and run them at 60psi they will be running at 387cc or so. that's good for 180rwhp. just throw in a EMB doesn't mean anythign if your injectors still cannot support a given BHP. |
change your EMB to an EMU and get some 440 or 550 injectors. screw anything smaller... you want headroom because a) it's safer and b) raising the boost is very very good.
dont eff around with adding a fuel return, it's probably a bigger pain in the ass. |
FWIW I have EMU with supra green top 310cc injectors, running ~210rwhp at 12-13afr. That's about the max for these injectors, so get bigger ones if you want any more power.
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Can you describe the symptoms, and how much boost are you running?
Assuming yiou are starting off at modest boost levels (say 6psi), I would guess that you need an o2 clamp. Some dyno (or wideband) tuning is in order before changing fuel injectors, pump etc. |
Don't forget the EMB can run additional injectors. So don't be afraid to wire some in. You be amazed at what a pair of 96 lb/hr injectors will do (roughly enough fuel for an extra 300 HP).
Mark |
What do I need to do to get an O2 clamp? Does anyone sell them? Also, it's more of a low budget project and EMU is kinda out of the question. I picked up this EMB for like $200. I have a buddy thats trading me some Ford brown tops, which I think are rated @ 370cc. Would these be too big for the EMB? Better yet, will they even fit? I know I have to modify out the harness, but that's no biggy.
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Anymore suggestions would be GREATLY appriciated
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Originally Posted by yadayada
(Post 89450)
What do I need to do to get an O2 clamp? Does anyone sell them? Also, it's more of a low budget project and EMU is kinda out of the question. I picked up this EMB for like $200. I have a buddy thats trading me some Ford brown tops, which I think are rated @ 370cc. Would these be too big for the EMB? Better yet, will they even fit? I know I have to modify out the harness, but that's no biggy.
whats the part numbers You;ll most likely need the clips and wire them in, and if they are low-ohm you'll have to wire in resistors as well. the EMB should still be able to perfectly handle the 370s. also consider: 89-92 Toyota Supra 7MGE NA 305cc – Light Green Top #23250-70080 93-95 Toyota Supra 3.0L 312cc - Maroon Top #23250-46030 Toyota 3SGE 315cc – Pink Top 89-91 B2600 Truck 326cc - Gray Top #195500-2150 Mazda 323 GTX TURBO 360cc - Black Top #195500-2130 Celica/MR2 3SGE NA 370cc - Green Top #23250-74160 for plug and play injectors. |
YOUR FUEL PUMP WILL BE FINE...as others have said, its your injectors that are too small, id suggest for an easy fix get some 330's in there and retune, with the higher fuel pressure the NB runs they will be great, if you want to push the boundaries a little bit the get some mazda GTX 360cc injectors (red top, also found in toyota 4agze), the 330cc limit is for the old 1600 engine and ecu...im sure the better NB ecu along with an extra 200cc's of engine should make the 360's a good choice.
if you need even more than that then a fifth or sixth injector/s would be a great choice for clutch melting/diff blowing HP.:) |
Thanks for all the input/advice guys, and thanks for not treating me like most newbs get bashed!:bigtu:
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Originally Posted by yadayada
(Post 89450)
What do I need to do to get an O2 clamp? Does anyone sell them? Also, it's more of a low budget project and EMU is kinda out of the question. I picked up this EMB for like $200. I have a buddy thats trading me some Ford brown tops, which I think are rated @ 370cc. Would these be too big for the EMB? Better yet, will they even fit? I know I have to modify out the harness, but that's no biggy.
The only problem you might have with fuel is a defective pump. You should really get a fuel pressure gauge wired in to watch it. I have several friends that have replaced pumps in their Mazdaspeeds with the same type system. |
Originally Posted by Braineack
(Post 89681)
89-92 Toyota Supra 7MGE NA 305cc – Light Green Top #23250-70080 93-95 Toyota Supra 3.0L 312cc - Maroon Top #23250-46030 Toyota 3SGE 315cc – Pink Top 89-91 B2600 Truck 326cc - Gray Top #195500-2150 Mazda 323 GTX TURBO 360cc - Black Top #195500-2130 Celica/MR2 3SGE NA 370cc - Green Top #23250-74160 for plug and play injectors. Just a note to say that the 323 GTX injectors above are generally regarded as 330cc not 360cc as above.....the red top 323 GTR/4agze are 365cc but are low impedance so youll need a ballast resistor pack to run them. |
Originally Posted by yadayada
(Post 89869)
Thanks for all the input/advice guys, and thanks for not treating me like most newbs get bashed!:bigtu:
Mark |
Originally Posted by Markp
(Post 89922)
Ask intelligent questions and you get intelligent answers... go figure!
Mark |
Originally Posted by 4sfed5
(Post 89886)
Just a note to say that the 323 GTX injectors above are generally regarded as 330cc not 360cc as above.....the red top 323 GTR/4agze are 365cc but are low impedance so youll need a ballast resistor pack to run them.
WitchHunter flowed them at 360cc http://www.witchhunter.com/flowdatapix/d1955002130.jpg |
Originally Posted by y8s
(Post 89948)
go back to the Other Forum, punk!
Mark |
Originally Posted by Markp
(Post 89922)
Ask intelligent questions and you get intelligent answers... go figure!
Mark |
Originally Posted by olderguy
(Post 89878)
I sell a clamp for $65. My email is in my profile.
The only problem you might have with fuel is a defective pump. You should really get a fuel pressure gauge wired in to watch it. I have several friends that have replaced pumps in their Mazdaspeeds with the same type system. |
Originally Posted by Braineack
(Post 90024)
Having said that though, when i had mine cleaned and flow checked they flowed at 395cc at 3 bar,:ugh2: so go figure! i thought that the stuff they used must have been thinner than standard flow checking fluid or something. |
Originally Posted by yadayada
(Post 90246)
so for my car to run correctly, do I need this o2 clamp? Or is it just the injectors that need to be upgraded?
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Originally Posted by RusMan
(Post 90328)
I don't have, it runs fine, I don't think I need one. Mine's a little rough stransitioning into boost when not fully warmed up, but I always warm it up before driving so it's not a problem for me.
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I had the same problem as you did, but I fixed that with careful tuning. As far as advantages of emu, I'm not too sure. Never looked that much into emb, but yeah bigger injectors, auto tune, maf elimination are things that come to mind.
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i had some boost transition hiccups when cold and it was because the o2 clamp was set a bit rich, so i leaned it out a bit and retuned the rest of the boosted rows.
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You CAN use a FPR on a return less system. It has to be used in conjunction with an external fuel pump. But it does work.
My suggestion would be to upgrade injectors or use BEGi fuel system, and switch to the EMU. Stephanie |
Stephanie, that is very interesting. How do you plumb the FMU in a returnless system such as in the NB?
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I run 370cc injectors and the emanage blue on my car. Runs fine.
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yeah, how might you plumb that up, please, share with us stephanie...hahaha
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btw, this is how you plumb one:
http://home.alltel.net/mcfly/images/...urnlessFMU.jpg basically it goes in it's own loop just before and after the inline....then when it starts to clamp off, some of the gas enters the fmu and gets clamped causing the inline to increase the pressure. |
ahhh clever!
Scott, why don't you put that in your FAQ and then we can refer NB owners to it. |
maybe i will. ;)
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wonder if running 100psi fuel pressure into the FMU will have any negative effects. :dunno:
still pretty durn clever |
i'm not good at those illustrations, any pictures?
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Originally Posted by Ben
(Post 91567)
Stephanie, that is very interesting. How do you plumb the FMU in a returnless system such as in the NB?
Stephanie |
I'm still not really sure what the point is..
I'm 99.3% sure that I can idle 550's on my 03 with nothing more than a emanage blue. We idle 650's on a scion that comes with 370's stock.. :) I may have to try before I go to hydra, just for the benefit of the community. |
well dude idle is one thing. driving around real nice-like is another. but I'm sure you know that.
FWIW, my 91 can idle 550s on its stock ecu. |
wow, that is pretty frickn amazing
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