Advice needed on an Engine/Transmission swap. (Page 2/5)
pmbrunelle JAN 27, 07:34 PM
Many folks suggest the MegaSquirt type stuff, but you are in California.

If you want this project to be street-legal, then you should probably stay away from MegaSquirt...
Murcie-Me JAN 27, 08:45 PM


quote
Originally posted by pmbrunelle:

Many folks suggest the MegaSquirt type stuff, but you are in California.

If you want this project to be street-legal, then you should probably stay away from MegaSquirt...



All my cars and boat are registered under my L.L.C. in Montana, I paid a one time registration fee for each and have never had to pay again.
This is the car now, my son and I decided to try our hands at doing a satin purple wrap. It actually came out really nice.
I was also wondering about the fuel pump pressure. Does the stock Fiero fuel pump put out enough pressure for the LZ9 injectors?.


[This message has been edited by Murcie-Me (edited 01-27-2025).]

82-T/A [At Work] JAN 28, 08:30 AM

quote
Originally posted by Murcie-Me:
I was also wondering about the fuel pump pressure. Does the stock Fiero fuel pump put out enough pressure for the LZ9 injectors?.





I am still so amazed at the fit and finish of that car. Obviously a lot of work had to be done, because the windshield is different too. Most people change out the panels, but leave the windshield and A-pillars, which makes it a dead give-away... but you updated all of that too. It looks amazing.


Short answer is yes (I'm 95% sure). The fuel pump in the V6s goes up to 45psi or higher, which is basically what's required for all of those motors ~42psi.

But with all the work you've done to the car, I'd highly recommend replacing the fuel pump with a newer one (high quality), simply because you'll already have the engine out, and then you can also swap out the rubber fuel lines and rubber filler neck too.
1985 Fiero GT JAN 28, 10:34 AM

quote
Originally posted by 82-T/A [At Work]:


I am still so amazed at the fit and finish of that car. Obviously a lot of work had to be done, because the windshield is different too. Most people change out the panels, but leave the windshield and A-pillars, which makes it a dead give-away... but you updated all of that too. It looks amazing.


Short answer is yes (I'm 95% sure). The fuel pump in the V6s goes up to 45psi or higher, which is basically what's required for all of those motors ~42psi.

But with all the work you've done to the car, I'd highly recommend replacing the fuel pump with a newer one (high quality), simply because you'll already have the engine out, and then you can also swap out the rubber fuel lines and rubber filler neck too.



Yeah I've heard differing opinions, the pump can definitely go up to the pressures, but I don't know if it has the flow rate. It seems it's the same pump as is used on some V8 Corvette (plastic instead of metal intervals though) so it should be able to. I have a Rodney Dickman fuel pump (60psi max) and I don't know if it will be enough for the turbo 3400, but I will monitor the fuel pressure, and see if it is, it should be though. It's a cheap, high quality pump made by someone you can trust, so if it can handle it, I'm definitely keeping it.
Dennis LaGrua JAN 28, 12:17 PM

quote
Originally posted by Murcie-Me:


All my cars and boat are registered under my L.L.C. in Montana, I paid a one time registration fee for each and have never had to pay again.
This is the car now, my son and I decided to try our hands at doing a satin purple wrap. It actually came out really nice.
I was also wondering about the fuel pump pressure. Does the stock Fiero fuel pump put out enough pressure for the LZ9 injectors?



I would not use an aftermarket ECM. The in tank fuel pump used by the LZ9 feeds a returnless fuel system that requires a pulse width modulated voltage signal.l. You may be able to use a stock style fuel pump if you add a regulator to the single feed line. Then if you go to an electric shifted trans the megasquirt won't be able to shift it..

------------------
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"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
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Murcie-Me JAN 29, 12:17 AM
I think im sold on the non electrically controlled 4T60, I want to make this as simple as possible. For the fuel pump, I'll either modify one from the 2006 Impala or buy something aftermarket. The fiero fuel pump puts out between 34-46 P.S.I., while the required pressure for the LZ9 injectors is 55-62.
I went to the local junkyard today and pulled all the wiring plugs off an Impala they had there. I think the only ones I'll need is for the oil pressure sender, coil pack, TPS, IAC (I will probably use a different throttle body though), and the temperature sensor.

Murcie-Me FEB 01, 11:13 PM
I went to the junkyard today and picked up an LZ4 intake manifold, and a 75mm throttle body from a 1998 chevy pickup. I took the throttle body apart and soaked in in parts cleaner for an hour and then washed the manifold with simple green and a pressure washer.
Does anybody know if the throttle position sensor and the idle air control on this throttle body is compatible with the megasquirt mini pro3 ECM?
I'm still looking for a 4T60 transaxel on Ebay, they seem to be few and far between.
1985 Fiero GT FEB 02, 10:05 AM

quote
Originally posted by Murcie-Me:

I went to the junkyard today and picked up an LZ4 intake manifold, and a 75mm throttle body from a 1998 chevy pickup. I took the throttle body apart and soaked in in parts cleaner for an hour and then washed the manifold with simple green and a pressure washer.
Does anybody know if the throttle position sensor and the idle air control on this throttle body is compatible with the megasquirt mini pro3 ECM?
I'm still looking for a 4T60 transaxel on Ebay, they seem to be few and far between.



TPS should be, as far as I know basically everything "normal" is supported, the IAC won't be, that's a 4 wire IAC, it has 2 coils that are pulsed back and forth against each other to achieve a position, the megasquirt 3 pro mini only supports 2 wire PWM iacs, using an electromagnet pulsed against a spring to hooks position, I don't know of any throttle bodies with that type, haven't really looked into it, I'll be using a hose input output IAC, I can hook it up into the original IAC tube going from the throttle body to the lower intake, some BMW's have them, some Volkswagen's, mine came from a Porsche 911 from some year, maybe some Mustangs as well.

[This message has been edited by 1985 Fiero GT (edited 02-02-2025).]

BillS FEB 02, 11:52 AM
Not sure how much power you are after, but you can get reasonable power using the V6. I have a 3.4 V6 in one of my cars that puts out in the 190-200 bhp range using conventional tuning methods.

My old 88 Fiero had around 300 bhp using a 3.2 displacement with 10 psi of turbo. Ran really well without issue for the 19 years I owned it.

Either of those avoids changing the engine to a V8 and avoids a fair bit of work.
Murcie-Me FEB 02, 03:59 PM

quote
Originally posted by 1985 Fiero GT:


TPS should be, as far as I know basically everything "normal" is supported, the IAC won't be, that's a 4 wire IAC, it has 2 coils that are pulsed back and forth against each other to achieve a position, the megasquirt 3 pro mini only supports 2 wire PWM iacs, using an electromagnet pulsed against a spring to hooks position, I don't know of any throttle bodies with that type, haven't really looked into it, I'll be using a hose input output IAC, I can hook it up into the original IAC tube going from the throttle body to the lower intake, some BMW's have them, some Volkswagen's, mine came from a Porsche 911 from some year, maybe some Mustangs as well.




I was wondering if it was possible to do something like you mentioned, maybe milling a port in the intake where the IAC can be mounted and not on the throttle body. I'm sure a plate can be made to seal the opening where the IAC mounts to the throttle body. Is there any reason the IAC needs to be on the throttle body???
Do you know it the IAC on the Fiero 2.8 is a 2 wire, and if so would that be compatible with the megasquirt?