Georgia Fiero Club Forum

All Things Fiero => Tech Tips, Tech Questions => Topic started by: Raydar on April 08, 2019, 07:26:57 pm

Title: F85gtron... F23 question
Post by: Raydar on April 08, 2019, 07:26:57 pm

Ron, when you installed the F23, did you swap the case halves around, in order to get the 3.6x(?) FDR? Or did you keep the 3.9x FDR?
I'm about to acquire a 3.4 DOHC and an F23. I'm trying to decide whether to go with the 3.9x FDR, or go to the trouble to swap case halves around.

Title: Re: F85gtron... F23 question
Post by: GTRS Fiero on May 17, 2019, 05:02:58 pm

Should probably bump this, in case Ron checks in.

Title: Re: F85gtron... F23 question
Post by: Raydar on May 18, 2019, 06:56:46 am

Thanks. I haven't seem him in months, though.

Title: Re: F85gtron... F23 question
Post by: GTRS Fiero on May 18, 2019, 08:02:59 am

He logged on about a month ago, so hopefully he's still checking.

Title: Re: F85gtron... F23 question
Post by: f85gtron on July 02, 2019, 11:21:17 pm

Howdy!
I have the 60* bellhousing f23 from the cavalier. The cobalt one has the ecotech housing, so I lucked out and didn’t have to change anything other than the shifting rod clocking, which isn’t necessary anymore because there’s way better kits out than when I did it.

Title: Re: F85gtron... F23 question
Post by: Raydar on July 06, 2019, 07:17:27 pm

Awesome! Thanks for the reply.
So how are your RPMs at highway speeds? Do you blow through 1st gear, like, immediately? :D

Good to see you. Been a long time.

Title: Re: F85gtron... F23 question
Post by: f85gtron on July 11, 2019, 01:01:37 am

The gearing is almost perfect, compared to the Muncie 4 it replaced.  With 14" rims, I kept smoking 1, 2, 3, and my speedo was off.  Installed 17" wheels, and speedo is dead-on and no more unintended burnouts.  The 3rd gear breaking loose was unnerving.  I swapped ends a couple times.  Of course, that was with my 3.4+ bored, valved, opened up and tuned.  I can't remember my hwy rpm.  I want to say 1700 @ 70?  Ill get it out this weekend and reply with the speeds. 

Title: Re: F85gtron... F23 question
Post by: GTRS Fiero on July 11, 2019, 07:35:33 am

You accidentally spun the rear wheels of your Fiero in 1, 2, and 3?  How much torque do you have?

Title: Re: F85gtron... F23 question
Post by: scottb on July 11, 2019, 08:29:57 pm

Enough to spin the tires in three gears ;D

Title: Re: F85gtron... F23 question
Post by: GTRS Fiero on July 11, 2019, 08:38:32 pm

I'm just wondering how a 3.4 with only 200 HP managed that.

Title: Re: F85gtron... F23 question
Post by: Fierofool on July 11, 2019, 10:33:51 pm

I can verify that 200 hp in a Grand Prix can burn rubber all the way into 2nd gear with an automatic.

Title: Re: F85gtron... F23 question
Post by: GTRS Fiero on July 11, 2019, 10:35:46 pm

I was just wondering about accidental in third.

Title: Re: F85gtron... F23 question
Post by: Raydar on July 12, 2019, 07:53:24 am

Thanks, Ron. I appreciate the info.
I have asked this same question in several places. Out of all the responses, only one person suggested that I should "piece-meal" one together, in order to get the taller gears. And that particular person can do swaps in his sleep, so a "Franken-trans" (jeez... that really sounds odd) is no big deal for him to cobble together.
Think I'll bolt it in, as is.  The DOHC is supposed to be good to 7200, so that should give me some room to play.