The LFX engine for a swap?. (Page 7/7)
Will DEC 12, 02:57 PM
F23's have the same ratios as the V6 282's, except for the Saturn Vue box, which has 0.81 fifth.
The Quad 4 282's frequently have the 3.94 final, just like the 2.4 F23's do.
Some of the Quad 4 boxes even have a 0.81 fifth (although I don't think GM ever used both 0.81 and 3.94 in the same gearbox in any US product)
Rodney Dickman makes urethane mounts and heavy duty brackets that bolt in.

I can't argue better shifting, but the 282's are not at all bad in that characteristic.

Come on, take this gearbox outta my shed

[This message has been edited by Will (edited 12-12-2018).]

Daryl M DEC 12, 10:46 PM
Mender, why did you decide on the F23 over the F40?
mender DEC 13, 01:00 AM
Sorry, already made the swap!

I had a 3.94 282 from a '92 GTZ but couldn't find a 0.81 fifth for it. Would have been just right for road racing!
mender DEC 13, 01:21 AM

quote
Originally posted by Daryl M:

Mender, why did you decide on the F23 over the F40?


I have a new 2006 F40 from a G6 (60 degree) but that was going to be used with a 3800SC.

The rules of my racing class changed and so did my plans, to using the LFX instead. The cost difference between a Saab F40 and the Quad4 F23 up here, the ability to use the stock Fiero axles, less weight than the F40 (only need five gears), gear ratios, and the ability to use a 60 degree F23 with the LX9 as a mockup and jig for mounts were the main reasons.
Dennis LaGrua DEC 14, 06:17 PM

quote
Originally posted by Darth Fiero:


I've done two LS4 swaps to date - both using factory CAN computers. And the ECM's don't care if the ABS, BCM, IPC, or other modules aren't present on the high speed GMLAN data bus - aside from setting a few insignificant trouble codes. The last LS4 swap I did used a 2008 ECM and TCM with no other modules whatsoever from the donor car present - and it ran fine (operated in closed loop, no problem).

Based on this, I suspect an LFX ECM isn't going to care if those other modules are missing either. The only thing that is a question right now is the FPCM issue.


Just got word from a guy that did an LFX swap in a Miata. He advised that he could not get the stock PCM to work. He used a Bosch e9 (not e9a) PCM and put the Camaro code in. He did have TCM and ABS.control. (believe the Miata has wheel speed sensors) Maybe you can get the LFX GM PCM to work but I have not found anyone so far who has. The guy that you have been working with is undoubtedly blazing new trails but we can't keep doing 3800SC swaps forever. IMO, time for a new technology engine swap in the Fiero.

------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Daryl M DEC 16, 02:31 AM
I just decided on how I was going to handle the VSS issue. Using a magnetic pickup on the intermediate axle shaft. Unfortunately we won't have an answer on if it all works for a while yet. Lots of work to be done before I am at the point where test drives start. Since I acquired my 88 as a project in progress, I plan on tearing everything down and starting from scratch. I found several things that were cobbled together. Don't want to tak a chance on trusting other peoples work. If I die from bad design or workmanship, I want it to at least be my own.
mender DEC 27, 09:49 PM

quote
Originally posted by Will:

F23's have the same ratios as the V6 282's, except for the Saturn Vue box, which has 0.81 fifth.
The Quad 4 282's frequently have the 3.94 final, just like the 2.4 F23's do.
Some of the Quad 4 boxes even have a 0.81 fifth (although I don't think GM ever used both 0.81 and 3.94 in the same gearbox in any US product)
Rodney Dickman makes urethane mounts and heavy duty brackets that bolt in.

I can't argue better shifting, but the 282's are not at all bad in that characteristic.

Come on, take this gearbox outta my shed



The main difference in gearing is the 3rd to 4th split, pretty important for road course racing as I use them the most. Some tracks I only use those two gears.

282 is 1.38 to 0.94; F23 is 1.35 to 0.98. Shifting at 6500 rpm (LFX) with the 282 would be a recovery rpm of 4421 rpm; F23 will be 4744 rpm, so 10% higher rpm. About 180 hp vs 200 hp.

I'm keeping an eye out for a Vue F23; even with the short fifth and 4.41 final, that still allows about 145 mph at 7000 rpm.

[This message has been edited by mender (edited 12-27-2018).]

Will DEC 28, 11:52 AM

quote
Originally posted by mender:

The main difference in gearing is the 3rd to 4th split, pretty important for road course racing as I use them the most. Some tracks I only use those two gears.

282 is 1.38 to 0.94; F23 is 1.35 to 0.98. Shifting at 6500 rpm (LFX) with the 282 would be a recovery rpm of 4421 rpm; F23 will be 4744 rpm, so 10% higher rpm. About 180 hp vs 200 hp.

I'm keeping an eye out for a Vue F23; even with the short fifth and 4.41 final, that still allows about 145 mph at 7000 rpm.





Don't forget there's a 1.02 fourth AND a 0.81 fifth available for the 282

mender DEC 28, 11:59 AM

quote
Originally posted by Will:
Don't forget there's a 1.02 fourth AND a 0.81 fifth available for the 282

I had trouble finding a spare 282 case let alone the good gear ratios!

I had a '91 GTZ box with the short fourth and 3.94 but couldn't locate a 0.81 fifth