My 1988 LFX F40 build. (Page 63/65)
Daryl M NOV 22, 10:16 PM

quote
Originally posted by RandomTask:


https://www.keislerautomation.com/

Guy does great work and is a pleasure to talk to. Tell him I sent you. The only issue I had is they forgot to crimp the strain reliefs on the relay box wires so 1 or 2 came undone. That said, everything else is top notch. They pretty much make the harness plug and play. IIRC, it was $900 and I just had to plug stuff in.





I was hoping to find a local guy. I have quite a bit of unique stuff to do on the car. Not just a swap. What did you do about the auxiliary vacuum pump for the brakes? How about the fuel pump?
ChuckR NOV 23, 05:42 AM
I know this is too late for your project but here is a great solution to the brake booster.

https://youtu.be/SRZ8XDNz2vU
Daryl M NOV 24, 01:25 AM

quote
Originally posted by ChuckR:

I know this is too late for your project but here is a great solution to the brake booster.

https://youtu.be/SRZ8XDNz2vU



I think the solution I am using is much simpler. The Impala has an electric auxiliary vacuum pump. In the impala, it is controlled by the ECM. I am controling mine with an adjustable vacuum switch. When vacuum drops below a preset level, the pump comes on. There are check valves on the impala that prevent bleed back.
Daryl M NOV 27, 12:13 AM
New question for the brain trust. I have noticed that the clutch pedal seems pretty heavy. After some quick research, it seems that the Fiero clutch master cylinder piston is about 36% larger than the Saab that the transmission came from. Does anyone know of an easy fix for this issue? Besides being hard to push, won't the slave overextend?
Rickady88GT NOV 27, 04:41 PM

quote
Originally posted by Daryl M:

New question for the brain trust. I have noticed that the clutch pedal seems pretty heavy. After some quick research, it seems that the Fiero clutch master cylinder piston is about 36% larger than the Saab that the transmission came from. Does anyone know of an easy fix for this issue? Besides being hard to push, won't the slave overextend?



Good question, I think you are correct. The clutch pressure plate is going to travel to far. With no benefits to the extra travel and the possibility of pushing the slave cylinder beyond its designed limit, could be a future failure or just a nuisance. I would think about a SAAB master. But this is just a guess.
Keep us updated
Daryl M NOV 27, 09:16 PM

quote
Originally posted by Rickady88GT:


Good question, I think you are correct. The clutch pressure plate is going to travel to far. With no benefits to the extra travel and the possibility of pushing the slave cylinder beyond its designed limit, could be a future failure or just a nuisance. I would think about a SAAB master. But this is just a guess.
Keep us updated



Saab master cylinder would be challenging to adapt due to pedal setup and plumbing. I'm researching for a master cylinder that has a 15mm piston and a more similar mounting system. I also wonder if the Fiero unit can be sleeved to a smaller piston size? I have a couple of the Fiero units sitting around and a lathe. What could go wrong?
Rickady88GT NOV 28, 01:28 AM

quote
Originally posted by Daryl M:


Saab master cylinder would be challenging to adapt due to pedal setup and plumbing. I'm researching for a master cylinder that has a 15mm piston and a more similar mounting system. I also wonder if the Fiero unit can be sleeved to a smaller piston size? I have a couple of the Fiero units sitting around and a lathe. What could go wrong?



I get it, and you might be on to something, but is that easier? Swaps are not all plug and play, sometimes some trial and error is required for the good of the group.
Keep us updated, thanks
fieroguru DEC 01, 06:29 PM
While I would say the 100+ fieros running the F40 and stock master would imply this is a non-issue when properly setup, the easy solution to lower the force and reduce the travel would be to move the banjo attachment up 1/8 to 1/4".
Daryl M DEC 02, 07:54 PM

quote
Originally posted by fieroguru:

While I would say the 100+ fieros running the F40 and stock master would imply this is a non-issue when properly setup, the easy solution to lower the force and reduce the travel would be to move the banjo attachment up 1/8 to 1/4".



That may do the trick. I'm giving up on modifying the piston size of the stock Fiero unit. As it turns out, using the Saab unit may be easier than I thought. I have one coming and will report back on what I come up with. The difference of the piston diameter is pretty big, 13mm vs. 17mm.
Joseph Upson DEC 02, 08:23 PM

quote
Originally posted by Daryl M:


That may do the trick. I'm giving up on modifying the piston size of the stock Fiero unit. As it turns out, using the Saab unit may be easier than I thought. I have one coming and will report back on what I come up with. The difference of the piston diameter is pretty big, 13mm vs. 17mm.



I used an OE new first design clutch master cylinder because it was the most dependable for me of all of them made for the Fiero, and simply spaced it off the mount surface a bit and never had a problem.