LS4 Front-Drives 2005-2009 - V8 Fiero with an LS4

Some video of my 88 Fiero GT with the LS4.
The video is sub-par but is a start.

http://www.youtube.com/watch?v=YiFdBxKgwNs&feature=channel

http://www.youtube.com/watch?v=WWDw1Ugi654

I got some good help from this forum, so thanks for the help.

wow! pics of car and interior please!

This is the build thread on a Fiero forum.

http://www.fiero.nl/forum/Forum2/HTML/101202.html

i envy your talent. thanks for the link!

Very nice. Saw where you can get this done for $10500 out in TX. I'm sure you got out a lot cheaper on your own, though. VERY cool. I love it. Actually planning on buying a L67 Fiero here pretty soon.

Thanks, I got the drive train for about $2,000. The interior was about $1,000.
No way could I do this for a "job" WAY to much work to actually make money.
But it is a truly unique Fiero.

:hail::hail::hail::hail::hail::hail::hail:

I wish I knew how to do any of that. Love all the custom work. Any room for turbo in there? Just curious.

:hail::hail::hail::hail::hail::hail::hail:

I wish I knew how to do any of that. Love all the custom work. Any room for turbo in there? Just curious.

Thanks, no room for a turbo. I don't want to cut into my trunk. My wife and I took the car on a three day trip. That is where the vid came from. If I cut my trunk like some others have done to their Fiero, I could not take our cloths. BUT if I did cut the trunk I guess I could do a turbo? To be honest, I would love to install a turbo. I just don't want to spend the $,$$$ on one right now.
Do you have a system, cheap? LOL.

I plan on an LS6 intake swap. I am getting 25mpg with the DOD. But this is a toy and the extra power is worth the extra gas it will use. And a 6 speed manual would top it all of nicely.

whats the interior out of? radio looks like an impala/monte radio.

Just curious, I'm deciding beween an LSx RX-7 or Turboing the GXP... The kit is only $5,500 plus shipping ;)

6-speed would be awesome.

wow, thats nice, great work.

To me it looks like the interior is out of a new Malibu. Awsome ride!

whats the interior out of? radio looks like an impala/monte radio.


Yes the dash is a 08 Malibu and the radio, HVAC controles, gauges, steering colum and all switches are 06 Monte.
I wanted the Malibu dash but had to use the Monte electronics to comunicate with the Monte BCM for all the normal Monte functions to work properly.

I'm planning on picking up a 3800 SC swapped car in December, it won't be nearly this nice though. I do love swapped fieros...

very nice work man....car looks awesome!

Very Very good work

My first car was an 88 Fiero GT. I loved it, and still miss it sometimes! This is like pure car heaven for me, a Fiero with the throbbing V8 it always deserved! Congrats on building a truly unique car, it looks and sounds awesome!

Thanks, I have to give credit to my wife for helping me.
The 6 disk radio sounds GREAT with an amp components and a sub.

WOW!!!!!!!!!!! I'm in awe!!!! That's some awesome attention to detail, and such a sick build - great work!!!!!!!!!!! I'm reading your thread over on the Fiero site and just sitting here with my jaw hanging wide open. Kudos!!

WOW!!!!!!!!!!! I'm in awe!!!! That's some awesome attention to detail, and such a sick build - great work!!!!!!!!!!! I'm reading your thread over on the Fiero site and just sitting here with my jaw hanging wide open. Kudos!!


Thanks, I am dieing to do a rear wheel drive W body. I have a 2002 Olds Intrigue that I would like a 6 speed GTO drive train swapped in to :)


But then, there are lots of things I want to do.

Wow. Just... stunned man. There's respect to be given for all the work you've put in. It's just amazing..

Wow. Just... stunned man. There's respect to be given for all the work you've put in. It's just amazing..

Thank you, but it is not done yet. I still have a lot of work to do.



One thing that bugs me is that I used the stock Monte fuel sending unit in the Fiero tank. The Fiero tank only holds 11gal. I don't know what the monte can hold, but the difference in size really screws up the D.I.C. miles remaining estimate. It is nearly half what I can actually go. It starts off over 400 miles but I can only get 200-250 depending on how heavy my foot gets.
It sure would be nice if I could recalibrate that?

That is a very nice build and the attention to detail is amazing. Great job and I bet its a ball to drive.

HaHa, yah its fun to drive.
I have to have a light foot on corners from a dead stop. The 255 45 17's brake loose easily and has a bit of snap steer at throttle lift. The balance of steering with the throttle and steering wheel is a trick, at the limit.

HaHa, yah its fun to drive.
I have to have a light foot on corners from a dead stop. The 255 45 17's brake loose easily and has a bit of snap steer at throttle lift. The balance of steering with the throttle and steering wheel is a trick, at the limit.

I imagine. I have 275's and I still can't hook, I have more power but the car is heavier. I figured it wouldn't be too bad in throttle lift but I don't know what the weight distribution is. I would assume, wrongly apparently, that a mid engine V-8 Fiero would be a good handling car. Is it just too much power or is it a weight distribution issue?

In stock trim, a Fiero has approximately 58% weight on the rear wheels. Hard to say how this may change with the LS4/4T65 combo, but since the engine is just in front of the rear wheels, I doubt the difference is terribly significant.

:cheers:

In stock trim, a Fiero has approximately 58% weight on the rear wheels. Hard to say how this may change with the LS4/4T65 combo, but since the engine is just in front of the rear wheels, I doubt the difference is terribly significant.

:cheers:

Which would counter throttle lift issues. He stated he had them so either the weight is significantly different or the power is too much for the chassis to handle. Mid engine cars are usually neutral or they understeer. This isn't the case in this car.

And he has an 88, which has a superior suspension set-up than earlier models. LS4 has more than twice the power and torque of the engine that GM put in this chassis, so might have an effect.

It's been a while since I checked out the thread over on PFF so I don't recall if he upgraded bushings/struts... Fiero's essentially have a FWD set-up in the rear, so torque steer could still be an issue.

:cheers:

Wow man that is an amazing job! I was just browsing and saw this. Amazing!! Always loved the Fiero. Such a bad ass car. Way ahead of its time in design IMO. The world of cars is a better place because of people like you. It takes some serious brain power to pull that off as perfectly as you did it.

And he has an 88, which has a superior suspension set-up than earlier models. LS4 has more than twice the power and torque of the engine that GM put in this chassis, so might have an effect.

It's been a while since I checked out the thread over on PFF so I don't recall if he upgraded bushings/struts... Fiero's essentially have a FWD set-up in the rear, so torque steer could still be an issue.

:cheers:

I think you hit the nail on the head. The stock rubber bushings are still in it. I have no idea if they were ever changed but the car has over 250,000 miles on it.
The quad cam 3.5 Short Star was rated at 215hp and I did not have any of the snap steer. I now have about 100 extra hp over that swap and I think the bushings just cant take it. The car rides beautifully and very quiet so the rubber would have been fine for a while longer if I did not swapped in this V8. Looks like I will just do polly in the rear and see what happens. I want to keep the rubber in front because I like the smooth ride, so I will replace it with new. My opinion is that the front of an 88 does not "need" polly like the other Fiero's to handle better. The rubber just needs to be in good shape and it will handle great. The rear is a little different. It has more bushings than the front and with the 300+hp can get more "twisted", so polly should help.

Wow man that is an amazing job! I was just browsing and saw this. Amazing!! Always loved the Fiero. Such a bad ass car. Way ahead of its time in design IMO. The world of cars is a better place because of people like you. It takes some serious brain power to pull that off as perfectly as you did it.

Thank you, the car still needs some work but is a lot of fun to drive.
I appreciate custom cars because I know how much blood sweat and tears go into them. So talking to people about the car is making all the work worth while.
At the Coast on highway 1 I noticed several people stopped and looking at the car. One person was taking pictures of it so I opened the deck lid for him. 20 min latter I went back into the restaurant to eat. Then after breakfast more people were looking at it. So I must have talked for 45-an hour about hot rods.
I get to hear about lots of cool stuff and show off my car at the same time. Infact today I was a little late to work because I was stopped by a guy in the parking lot who was asking questions about the car.

I do have a few questions about HP tuner for the 06 Monte LS4.
I want to get a tune done on it so my question is what are the most common things changed on a "high performance" daily driver.
The stock tranny shifts so unbelievably smooth in this car that I literally cant feel it shift sometimes. So I know I want to install a shift kit. The car is lighter than the 06 Monte that the engine came from so I am not concerned about hurting the tranny. I just don't want the extra hard shift setting when I install the kit. Other than the none stock air box and "free flowing" exhaust the drive train is stock. I have no muffler, just a cat and resonator tips and it does not have the typical code like the catless down pipes are getting.

Any and all advice is greatly appreciated.

This is inspirational!! Love it,.....

I do have a few questions about HP tuner for the 06 Monte LS4.
I want to get a tune done on it so my question is what are the most common things changed on a "high performance" daily driver.
The stock tranny shifts so unbelievably smooth in this car that I literally cant feel it shift sometimes. So I know I want to install a shift kit. The car is lighter than the 06 Monte that the engine came from so I am not concerned about hurting the tranny. I just don't want the extra hard shift setting when I install the kit. Other than the none stock air box and "free flowing" exhaust the drive train is stock. I have no muffler, just a cat and resonator tips and it does not have the typical code like the catless down pipes are getting.

Any and all advice is greatly appreciated.

Well, you can play with shift pressures a bit to make the shifts a bit crisper.

I'm not suggesting that you go all the way to max pressure, but if you ever want to find out what max pressure shifts feel like, unplug the maf and go for a short drive. For whatever reason, GM programmed the transmission to provide max pressure when a MAF failed - probably to ensure people brought the vehicle in for servicing. The downshifts are brutal.

Sounds like you've done relatively few mods, so your tuning requirements aren't too extensive, with your intake and exhaust mods, you probably need to have the VE table and maf curve tuned.

Stock tune delays entry into PE mode, have it come in around 2500. The PE fueling table is shit - as in ridiculously rich at higher rpm, you probably want to set the PE AFR to ~12.8 across the board. this will help power in the upper rpm range. PE enrichment rate should be increased to 1 from .02 - all this does is decrease the time it takes to move to your desired PE AFR

If you've upgraded valve springs, consider increasing shift points and rev limiter - has a benefit in first gear acceleration.

I removed all engine torque management and about half of the transmission torque management

The engine can take a bit more timing in the higher RPM and "dyn cyl air" cells, no real point in bumping timing below 2000 RPM, I just got knock when I tried.

There's a few other things that might be adjusted, but this is most of the basics.

The torque management tuning won't fix your problem when accelerating around a corner, the only way to avoid this is to disable differential score protection. Problem is that that puts the differential clutches at risk. Since you are rear wheel drive, you might get away with it. I think Ryan did this on BLKCOFY's LS4 swap.

:cheers:

Cool thanks, I will pass this on to the shop that will tune the car.

Did not get a tune for the car yet, but did get some "traction control" settings taken care of;)

http://www.youtube.com/watch?v=OE-VqF94wBQ

http://www.youtube.com/watch?v=epoLQQU73i0

http://www.youtube.com/watch?v=epoLQQU73i0

OK, I have got to know...read your build report and you say you plan to sell this sometime and build another amazing machine. Sure would be nice to get my hands on this one as I am pretty positive I could never even begin to build one as nice....when ya sellin it to me??

OK, I have got to know...read your build report and you say you plan to sell this sometime and build another amazing machine. Sure would be nice to get my hands on this one as I am pretty positive I could never even begin to build one as nice....when ya sellin it to me??


Thanks, the car is far from complete but I will continue to work on it till some one makes a good enough offer or till I just get another car to build.
I would love to have a Saturn Sky or Pontiac Solstice to swap V8 into.