3500 fiero swap

[americasfuture2k]

my decklid is notched for the alt as well.

[hookdonspeed]

can you post a pic of where and howmuch you had to notch?

...wonder if there is a 3bolt alt that could go where the AC compressor does...

[americasfuture2k]

lemme dig one up. its not in the best of work done. jon, er merlot was lazy and rushing things. not the nest, but you get the idea. its too cold and wet out right now for me to get my lazy bum off the couch and walkd down stairs down the parking lot a bit and go to my garage to snap a pic only to realize i forgot my mem card. yea, im being very lazy right now haha. but ill get one with the decklid closed

[hookdonspeed]

sweet, that pic is fine, just what i wanted to see..

ive come to a small delema with the wiring harness... should i use the 3500 harness, cut off the o.e plugs and just re-pin the wires and put into the 98ecu connector? or should i try and find a 98 wiring harness, and put that onto the engine? if i go with the 98 harness, are the sensor connectors i have on the 3500 still the same? (o2 sensors, injector connecter, map, etc...)

[Superdave]

Sent you that bin file, good luck!


On a side note, damn i want a Fiero GT

I can't even imagine how loud my engine would be in one though...

[hookdonspeed]

huh? what bin file?

[Superdave]

huh? what bin file?

oh, i ment to say that to americasfuture2k. lol

[americasfuture2k]

got the bin, replied to the email.

they might start going up in price now that pontiac is no more. i hope so and at the same time i hope not cause i want more!

and yes, loud is a good word for that engine in a fiero. 2.5" piping with no cat and short pipes, yea. loud. its pissed off some people like 4 houses down from my apartment hehe, ooops. >: D

[hookdonspeed]

figured out what ima do for the fuel system, ima keep the 3500 style returnless line system, and use a ls1 fuel filter, this is what a friend of mine did with his RX7 with an LS1 swap.

[IsaacHayes]

Does that have a regulator built into the filter? If so does it use vacuum to raise/lower the pressure or will that all be compensated for with lots of tuning?

[hookdonspeed]

AFAIK it is just a filter, i had the dealer fax me over pics of the LS1 fuel rail on the corvette and the camaro/firebird, the single line comes up to a fuel pressure regulator that goes into the crossover line, then T's off to the left and right rails, the only thing that concerns me is my friend said it was from the 00, but when i looked up a fuel filter at work, it shows it to be thenormal GM screw-on 1side/quick connect other side 2port filter

he has the GM partnumber he used, hes going to give me that when hedigs it up, ill call the dealer and findout the exect application tomorrow.

it has no vac line, and the LS1 is rated at 58psi, only 3psi over the 3500, not sure if its 58 constant or variable, ima do more reasearch before using it, even if that one doesnt work out, there is alot more 3line filters, just need to findout how they work :P


heres a pic of his install 1/2 way done (its done now and runs great)
you can see the stock FPR just under the one plastic cover on the crossover fuel line

[hookdonspeed]

well i just talked to another dealer, they say that filter IS the regulator and filter :/ the thing on the fuel rail is a "pulse dampener"

would using that filter/regulator AND the stock regulator work? i mean, it wouldnt be any different then how it regulates the stock fuel pressure, and 58 is still over max stock rating... when the stock regulator limeted it at 55, wouldnt the vette just bleed off the extra?

[mcgavinz26]

That engine looks familiar

I changed the filter on my 2000 this year as part of normal maintenance. I used ACDelco GF822, from Rockauto.com.

No vacuum compensation on this car, or hardly any new car anymore for that matter.

You're right about that thing being the pulse dampener and not a pressure regulator. I scanned through the service manuals for my car and it talks about everything in the fuel system in depth, but not much about the pulse dampener beyond location and replacement. They probably figured that the name was enough to guess how it works.

Vettes before my year, or maybe only 97 and 98 actually had a return system. They have 2 stainless lines feeding into the rail covers.

From what I remember about what I learned when I was really messing with my fuel system in the beretta, the highest fuel pressure wins. This was on a return system that went in this order:
Pump - stock regulator - Vortech SFMU - back to tank

I'm not totally following what you mean when you say that you are going to use the stock regulator and this returnless reg/filter together.

[hookdonspeed]

i know on a return style system the highest pressure wins because it allows the pressure on the "highside" to build till it reaches its max setting then allows excess to bleed back into the tank, on a returnless system the regulators are before the fuel rail, not after, so they somehow prevent more pressure from going to the fuel rail, as for they have no way to bleed off once it hits the rail.

i was planing on doing this.... from the way it seems the vette FPR and the stock 3500 regulator works, this SHOULD work IMO....

[mcgavinz26]

It looks like you've got the right idea. From 55 to 58 psi isn't a huge difference anyways. I would just measure the pressure in the rail when its running and make any adjustments after the fact. I would want as few obstructions in the fuel feed lines as possible and just go with one regulator if thats easily doable. I'm sure you're fine your way too.