LS4 / F40 swap - fieroguru (Page 139/216)
qwikgta OCT 02, 12:40 AM
great timing. i'm collecting parts for my DOD/AFM delete too. I'll be watching this close.
Will OCT 29, 01:27 PM
Any idea when you might have the 11.7" brake kit ready? That's a darn good fit.
fieroguru OCT 29, 09:44 PM

quote
Originally posted by Will:

Any idea when you might have the 11.7" brake kit ready? That's a darn good fit.



The 11.7" solution isn't going to work for fitment under the stock 88 15" wheels. The rear is tighter than the fronts due to the slightly different location of the caliper line bolt, but moving the caliper in about .020" and running a 1/16" wheel spacer should provide clearance in the rear.


The issue is the 88 front wheel. The inside rib is much wider and hits the bridge of the caliper, way more than 0.020"... so I am on the hunt for a slightly smaller rotor... 11.5 or 11.6.
88 Front Wheel:

88 & 85-87 Rear Wheel:



The 11.7 will likely work for the 84-87s using the stock 88 calipers.

[This message has been edited by fieroguru (edited 10-29-2018).]

Will OCT 30, 04:03 PM

quote
Originally posted by fieroguru:

The 11.7" solution isn't going to work for fitment under the stock 88 15" wheels.

... so I am on the hunt for a slightly smaller rotor... 11.5 or 11.6.



I guess the LeBaron 11.25" is too small to be worthwhile...

Do you mind sharing the application for the 11.7" rotor?
fieroguru OCT 30, 05:31 PM

quote
Originally posted by Will:
I guess the LeBaron 11.25" is too small to be worthwhile...

Do you mind sharing the application for the 11.7" rotor?



I am going to hold onto the 11.7" rotor info as I might use it for an 84-87 kit.

In addition to researching more rotor applications, I have also been researching other caliper options for the 88 Fieros and found an OEM caliper that will bolt directly to the 88 knuckle, moves the CL of the piston out about 0.4", allows for a wider rotor, and is available with piston sides of 48mm (stock Fiero) or 52mm (17% increase in clamp force). So in theory, with the "right" rotor you could fit a 11.1 or 11.2" rotor, see a 9.2% increase in mechanical leverage from the caliper placement, and either run it with the stock 48mm piston or the 52mm one for a 17% increase in clamp force... all without needing a caliper adapter bracket (just concentric rings depending on rotor application).

Another option would be to use this caliper with an existing 12" kit and run a 12.8" rotor (if the appropriate rotor exists).
Will OCT 31, 09:18 AM
12.8 is getting pretty large to be as thin as the original '88 rotor.

OTOH, there's an 11" solid rotor used on a Celicas that would have been a good non-track upgrade for '84-'87 cars using the stock (aluminum!) calipers.

Of course you can also spec Wilwood rotors for a brake kit. The hats are expensive, but are a one-time purchase. The rotors themselves can be in the $80 range up to 12.2" with careful selection.
Rickady88GT NOV 27, 06:39 PM
Sorry wrong thread.

[This message has been edited by Rickady88GT (edited 01-04-2019).]

Will DEC 23, 10:20 AM

quote
Originally posted by GreyElf:

My Saab Mechanic can't find any individual ratio P/N's...Sorry



I never thanked you for following up on this... so thanks!
Rickady88GT JAN 04, 07:25 AM

quote
Originally posted by fieroguru:


I am going to hold onto the 11.7" rotor info as I might use it for an 84-87 kit.

In addition to researching more rotor applications, I have also been researching other caliper options for the 88 Fieros and found an OEM caliper that will bolt directly to the 88 knuckle, moves the CL of the piston out about 0.4", allows for a wider rotor, and is available with piston sides of 48mm (stock Fiero) or 52mm (17% increase in clamp force). So in theory, with the "right" rotor you could fit a 11.1 or 11.2" rotor, see a 9.2% increase in mechanical leverage from the caliper placement, and either run it with the stock 48mm piston or the 52mm one for a 17% increase in clamp force... all without needing a caliper adapter bracket (just concentric rings depending on rotor application).

Another option would be to use this caliper with an existing 12" kit and run a 12.8" rotor (if the appropriate rotor exists).



Are the calipers aluminum? And is it a set of front and rear/with parking brake?
fieroguru JAN 04, 07:46 AM

quote
Originally posted by Rickady88GT:

Are the calipers aluminum? And is it a set of front and rear/with parking brake?



No, they are cast iron.
No, this is only the front calipers. There isn't a matching rear caliper with parking brake.

There wasn't much interested in this setup, so I have put it on the back burner for now. May revisit in another year or two.