swapping 95 3.0 with 90 3.0

[big_P]

I have a 95 Plymouth Voyager van, 3.0 3 speed. Trans was toast, engine had 125k on it so I pulled both out.

I have a freshly rebuilt 1990 3.0 with 543 transmission that's waiting to go in.

My question is: Can I keep the injectors from the 90? They are green. The 95's are orange. One is high impedance or low resistance or different wavelengths or some other bs.


I really, really don't want to pull out the green injectors, I just installed NEW o rings and it took me 3 hours to put them in. I don't want to swap lower intake manifolds because the one with the green injectors has been bead blasted and clear coated.

[edraws]

@ Big_P

Why don't you just put the whole '90 intake on the '95 block?

That's what I did with my engine swap. I have my '88 components on the '92 block.

[Boogieman142]

if you used the fuel rail and injectors off of the 95 and put them on the 90 you will be all set to use your 95 computer. If you use your 90 computer then you will lose the sequential fuel injection. And you don't want the 90 intake as it doesn't flow well to no. 5&6 cyls.

[edraws]

I didn't even think about the computer issue. I all my original components so I didn't consider that.

So you would have to swap the whole '95 intake system onto the '90 block.

90 and lower used MPI, 91 and higher used SMPI.

The injectors have different impendances.

[Ondonti]

just swap the lower intake

[edraws]

He might as well use the '95 plenum too since everyone says the older plenums have poor airflow.

[Boogieman142]

yes, the injectors should have different ones. Use the intake plenum off the 95, it flows better. you can either swap the fuelrail and injectors or do what brent says and to swap the whole lower intake

[Boogieman142]

Quote:

Originally Posted by edraws He might as well use the '95 plenum too since everyone says the older plenums have poor airflow.

The older ones do suck, if you look at the inside of them there is this tube like thing that makes it suck to the other side of the intake then back towards the tb, a poor design.

[big_P]

Quote:

Originally Posted by edraws @ Big_P Why don't you just put the whole '90 intake on the '95 block? That's what I did with my engine swap. I have my '88 components on the '92 block.

Quote:

I don't want to swap lower intake manifolds because the one with the green injectors has been bead blasted and clear coated.

The plenum has been clearcoated too.

[big_P]

what kind of performance/mpg losses would I expect if I threw in the 90 computer?

[edraws]

@ Boogieman142

Yeah I know, the newer plenums just have a divider in the middle providing better airflow.

@ Big_P

You're pretty much stuck swapping computers if you want to use the '90 engine without swapping anything.

Otherwise you will have to swap the '95 intake system onto the '90 block. Either way is easier than swapping injectors, etc...

Based on what I have read, you will gain performance with the 5-speed tranny, but I'm not sure about the ECU. The gas mileage is hard to judge because SMPI has better gas mileage results. But also, that could be because of the better flowing plenum, different injectors, and lower intake as well. You are going to loose gas mileage with MPI but also there is all the other factors depending on what you do.

[Ondonti]

you guys suck balls at reading (what i wrote).


Use the lower plenum.

Anyways a 1990 plenum is NOT the old torque tube plenum, get it straight.

Just use whatever plenum doesnt need EGR.

Im not sure what everyone is talking about because the information floating here is 100% wrong.

Just swap the lower intake and call it done. Use whatever plenum you want. The problem needs 5 minutes of work to fix.

[edraws]

@ Ondonti

Ok that straightens everything out then. I was under the impression the plenums from 90 and earlier had the tube runner setup.

But he doesn't want to swap anything because they have been refinished so he will have to swap his ECU if he doesn't want to swap any parts.

The easiest solution is to just swap the '95 lower intake onto the 90 block as per Ondonti.

Otherwise he would have to swap injectors, correct?

[big_P]

yeah **** it, I'll buy some new injector o-rings and put in the orange injectors. I want to keep my nice sandblasted and clear coated plenum :-\

[Ondonti]

Bah Im going to slap you on AIM.

JUST SWAP THE LOWER INTAKE