I have asked this question before but got too many diff. responses. What is the biggest injector I can run in DRAG3 equipped LS with an AFC, Intank pump, and FMU. I was thinking 370's or so. Does anybody have any experience, let me know?
Thanks,
EVIL

 

440

 

I second the 440 vote. I ran 370's before and they almost run on a stock computer.

 

We will be trying a various amounts of injector sizes to see what works best. This LS is going to be a monster on the street after we are done tuning it next week.
Thanks SGT and TURBO
EVIL


[Modified by Evil GS-R, 10:32 AM 6/19/2001]

 

the afc will work ghetto style and will control the 440cc but i highly reccommend a cheap standalone unit for full control.

 

Standalone is on the menu, but $$$ is a good issue here. By saying cheap stand alone is like saying waste $800+ on something that will take lots of hours and $$$ on the dyno to tune. AFC's are cheap and can be sold for almost thesame price as bought for. Stand alone is the correct way of doing it, I do agree. This is not a race car, its a street/strip type vehicle and will be driven daily.
EVIL

 

just out of curiosity but i was wondering if i could ditch my fmu and run an afc w/ bigger injectors for my car is this possible??? i'm running a greddy turbo on a 99 cx non-vtec sohc. how could i take care of the extra fuel needed for a turbo without using an fmu or aic?????


[Modified by sohc_boy, 2:02 PM 6/19/2001]

 

Stand alone is the only way to lose the FMU and high fuel pressure.

art

 

thanks for the info, oh well

 

Standalone is NOT the only way to ditch the high fuel pressures...

It's the better way to do it....

But i have a B18B, and run 550cc injectors, stock ECU (w/AFC, i know, afc blows), STOCK fuel pressure... and it all works fine... so i dont know where everybody keeps having the problems..... maybe it's those RC injectors.... They don't idle too well do they ? Honda's are designed to use Pintle style...





[Modified by MDA, 4:53 PM 6/19/2001]

 

So you are running at WOT stock fuel pressure and NO FMU?

art

 

Ok guys, art. So say what is the top psi i can run on an ls stock internals, with say 320s or so with an afc? what other electronics can yo use to obtain similar results as an afc? shogun tuner? BTW art what electonics do you have in yours?

 

mda, so u just use the afc and u have no probs controlling fuel????? i was thinking of using a set of stock dsm injectors for mine with the afc and trying to run without the fmu, do u think it would work???

 

Well Im not big on electronics unless its a stand alone. I guess the only electronic unit I have is the Profec A boost conrtroller. Im running the high fuel pressure with the FMU. Not my favorite but it'll do untill I buy Hondata.

art

 

Answering that first question, yes i run at WOT at STOCK fuel pressure... NO FMU (not anymore, i used to for a bit, b4 the big injectors)... i think the fuel pressure is 40 psi or so ...

Using stock injectors at stock fuel pressure with an AFC will NOT work as u can't turn up the MAP signal enough to deliver an effective duty cycle... You'll just throw a code...

U must run smaller injectors with an FMU... and you can only ditch the FMU once you get into the 440cc + sized injectors.... but naturally need some electronics to help control things...

Don't get me wrong, a full standalone is the best way to do it... however the AFC does work... contrary to popular belief....

 

The best way to find out what injector size is best would be to call RC and tell them what you have.

 

I agree the best thing to do is calculate it out ... but don't bother with RC if you're looking for big injectors... it's very hard if not impossible to get that style of injector to work properly without a full standalone if you're using 370cc+.... but the pintle style of Venom can work at even much large sizes without much trouble or tuning... just a crappy afc...

 

those stock injectors i was talking about were dsm injectors i think they are 450's, just figured it would be a cheap fix with the afc and no fmu

 

Yeah, so those 450's would probably work.... but how much power u trying to man????

 

i'm only running the greddy kit @ 6.5lbs right now, basically i only want to get rid of the fmu and maybe run a lil more boost. later i want to have the turbo upgraded but right now i just want to get rid of that fmu, i hate the way it runs right now (overly rich).

 

MDA, Does your car idle like stock? Are you using the stock fuel pump?

 

We've just dynoed a LS VTEC turbo with about 20lb boost running 1000cc injectors and a Hondata ECU upgrade.

4000 rpm 200hp (wheel)
4500 rpm 250 hp
4750 rpm 300 hp
7000 rpm 364 hp

Cost for the ecu upgrade excluding injectors was $690

Doug http://www.hondata.com

 

Do you guys do non-obd cars? Also is the upgrade tunable cause not all turbo honda/acuras are the same.

 

In short we cover the OBD0 VTEC ECUs (PR3 & PW0), OBD1 Civic EX (P28), GSR (P72), del sol (P30), Integra LS and GS (P74, P75). Many of the ECUs can be adapted to cover other engines. See http://www.hondata.com/products.html for more information.

The system is tunable (which is the whole idea). There's enough variables in each engine setup to make every car I've seen so far unique, so tuning the ECU to the engine produces the best results.

 

So it would cost 690 and the fuel/time curve can be customized?

I have a 91 non-obd LS.