BigBodyFord02

I have a 87 Toyota pickup that I have done extensive motor work to and I have talked to a few people that have told me I'm gonna need to run a engine management system on my truck to get it to run right. I have been told that since I went to a stage 2 cam and changed out my injectors that I'll need to run it. Any truth to this? Any help would be much appreciated.

xxxtreme22r

How much have you done to that engine that you needed different injectors? Stock injectors can handle a fair amount of extra power in these things. Probably didn't even need the injectors.

Stock ECU / O2 sensor(s) can support most bolt on mods. With what's in your sig, you don't need anything more then stock parts.

snobdds

I agree.

For what you have, I would not call it "extensive" engine work. You have a cam with a free flowing exhaust. No need for bigger injectors or a mega squirt system...

OrRunner

iTrader: (1)

Like said above, your fine.

The only thing differant on your 22re from mine:

I am running a 261C cam from engnbldr instead of LC

I am bore .020. instead of .030

I am running stock injectors

All seems to run fine. I would guess If your having running problems, go back to your stock injectors and you should be good to go

EDIT:
also running EB street rv head on top of that

snobdds

I guess the real question here is why did you switch out your injectors?

You still have the stock AFM which is not allowing you to get any more volume of air into your intake, even though you have a bored out TB; you don't have a preformance head to allow that cam to do much...so

I would go back to stock injectors.

xxxtreme22r

Even with a supra AFM swap you can still use stock injectors. Using too big of an injector can lead to some major drawbacks. I know this because I can't just swap in SBF 5.0 Injectors right into our BMW, I have to have the ECM chip reprogrammed even though it's an AFM style intake. End even then, Dinan makes a chip for mine that can dang near add almost 40-50 HP using the stock injectors on a stock engine.

Larger injectors won't spray right if the fuel pressure isn't changed. So many things you have to do to incorporate larger injectors it's not even funny. And in 99% of the cases larger injectors with a stand alone management system isn't worth the very little gain you get.

BigBodyFord02

The reason I went with new injectors is because LC Engineering included them in the package and they are only 200cc injectors I believe. I am also running a Nippon aluminum racing head that has been worked on as well. I was looking at the megasquirt because I have heard good things about them. I was told that since I went with a different cam it has changed my air/fuel ration and therefore need a management system to correct that. It runs like crap right now and I've deleted as many vacuum lines as possible to get that stuff out of the way. It's just starting to get on the expensive side as far as a project goes

gennro

200cc injectors is only 5cc bigger then stock

snobdds

It's kind of like decaf coffee...whats the point.

I still think stock ECM and stock injectors would be better for your set up. It sounds like you have other things wrong than your injectors though.

Punchy

Go with a MAP system and eliminate the AFM all together Or turbo it.
The problem with turbo with radical cams is that cams were designed with alot of overlap that is not needed with turbo systems.

I suggest a O2 meter and fnd out why its running like crap.

xxxtreme22r

Since when do cam's change A/F ratio? A/F ratio on an EFI truck ALWAYS stays the same. It never changes. 261 cam, 272 cam, don't matter one bit. SO not sure where that person was going with that statement.

BigBodyFord02

Like I said the only reason going with the injectors is because they were included in the package deal. Also the motor had over 180,000 on it so I figured it was about time to replace the injectors anyway while everything was torn apart. Just trying to tackle this project a little at a time when funds allow it. So that's why I was asking peoples opinions on the engine management systems.

xxxtreme22r

Did you adjust the TPS properly? If so how did you adjust it? And define running like crap.

wreckedrex

I don't know a helluva lot about the ems in these trucks, but generally the computer references a map and can add/pull some timing or fuel. That map is based on a stock motor, and there are limits to how much the ecu will deviate. It could be that the afm is enough of a restriction that you're not going going to see a helluva lot more air in the CC with anything short of FI, or maybe the pcm in these trucks is just that flexible (seems highly unlikely given the age). Either way, it seems like it would be worth the ~$50 to baseline the thing on a chassis dyno with a wide band to make sure. It's chump change compared to what you've got tied up in that build. FWIW A worked head, big cams, worked IM and headers is plenty enough to warrant a tune in BMW land. Or miata land. Or honda land... Hell, in a lot of cases small power gains can be made with a retune on a stock car.

As far as what system to go with, find a tuner you like and run with the system they're familiar with. MegaSquirt seems to be the most popular with the DIY crowd. There is (was?) a ton of info about it @ http://www.miataturbo.net/

xxxtreme22r

Not enough to matter. Like I said you have to add quite a bit of power to these to require bigger injectors, fuel pump and even the supra AFM. A cam just isn't gonna do it. 30 over isn't gonna do it. A performance head isn't gonna do it.

gennro

I am a megasquirt tuner/installer....... what you have done doesn't need a standalone, sounds like you have issues. Have you done your valve lash lately. If it is way out your engine will run like total ˟˟˟˟.

BigBodyFord02

On the TPS how do you normally adjust it? When I first got it back it was idling at about 3,000 RPM. Adjusted the idle screws down and now it idles somewhere around 750-1,000 (no tach). You have to crank on it work 5 minutes off and on to get it to start (normally just use starter fluid and feather the gas under it idles on its own). Also need to get a new ignition system on it, but gotta figure out a good one to go with.

xxxtreme22r

idle screws? There should only be one. And if an idle is that high something else is up. Maybe a vacuum leak someone that you just masked over by messing with the idle screw?

TPS adjustment procedure is in the FSM.

There are many other issues that can cause a hard start condition. COR (Circuit opening relay), Cold start injector, ignition timing (especially if not properly done) among a few other things.