1227730

[Raydar]

Tunercat seems to think it's "$A1".

$A1   1227730    91 - 93 J, L, W Cars LH0 3.1L V6   27C256  (The L Body was the Corsica and Beretta.)

www.tunercat.com

[f85gtron]

It would probably start and run if you hook up the coil packs and drop the dizzy just like it is.  The problem is vats will be active and it will prevent the setup from running. You'll have to burn a different chip.

[FieroVin]

Thanks guys, hopefully I can get all of this wiring sorted.  I'm planning to have Ryan from Sinister program a chip for me.  Still a bit unclear on a few things, I've seen people say you're eliminating the fan switch, but from Ryan's pinout chart and other diagrams I've seen it looks like you re-wire the switch.  Can anyone provide clarification there?

[Raydar]

Normally, on a 7730 install, I think the ECM controls the fan, instead of the switch. The wiring just gets moved from the switch, to one of the ECM outputs.

[f85gtron]

You can also leave the switch as is. Either way will work.

[f85gtron]

I just logged 200 miles on my 85 (little) tank. That's 30.30mpg highway uphill from Augusta to Memphis. That's with highway fueling mode activated @ 15.50 afr. I might bump the afr up a bit more until the heads start showing a couple more degrees and she how she does. I bet I could get 16 afr out of it. That would put me in the 33-34 mpg range maybe.

[GTRS Fiero]

MPG Based on gallons at the pump or tank size?

If you increase the AFR, don't you have to worry about running too lean?  Are you still running  the stock 2.8?  With a 5-speed?

[Raydar]

MPG Based on gallons at the pump or tank size?
If you increase the AFR, don't you have to worry about running too lean?

That's the whole idea. If the engine is just cruising, and not heavily loaded, it can run fairly lean without damaging anything. Significantly leaner than "ideal".
GM had this routine installed in several PCMs. As the story goes, they didn't have it enabled because it could potentially cause high NOx emissions.
 
Of course, I read that on the internet, so it has to be true. I hope Ron will correct me if I'm speaking an untruth.

[f85gtron]

Mpg based off pump gallons. 200miles/6.6gallons=30.30mpg.

Radar hit the nail on the head. Lean under minimum loads is acceptable. You can program the amount of advance vs load (map) to lessen the chance of melting your heads. You'll have have to watch knock counts and coolant temp.
Gm left the highway cruise and highway fuel options, tables, and scalers in most of their codes....usually with the settings already dialed in.

I'm running the 3.4 with f23, but the f23 with gears in between the 4speed and the 5 speed. At 75, I'm turning 2750 rpm. I think the 5speed turns a little lower and the 4speed turns higher rpm at speed.

Oh, and half of that was with my lights up....that probably worth mentioning.

[GTRS Fiero]

What is the advantage of the F23 compared to a 5-speed?

[f85gtron]

The gears are cut different. Synchronization is faster, more positive. That's about it.  Rowing through the gears feels more modern, effortless.  Because of the hydraulic throw out bearing setup, the point of engagement never changes and you can feel the clutch friction much more , making for perfect, confident takeoff every time. Plus, there's a lot more donors laying about in junkyard.....just waiting.....

[Drewbdo]

What is the advantage of the F23 compared to a 5-speed?

I thought the F23 is a 5-speed... ? Is there another 5 speed?

I have a normal V6 & automatic transmission in my car now, but at some future date, I'm thinking about dropping in a 3800SC and 5-speed manual, (or selling the car and buying a replica that already has that), so I'm trying to learn my options.

[Raydar]

I thought the F23 is a 5-speed... ? Is there another 5 speed?

The F23 is a 5 speed.
There was another  5 speed that was discussed for a minute or two. The F35.
From what I remember, it's not as suitable for our purposes as the F23. (Different gearing? Weaker construction? Maybe?)
I don't remember what any of its applications are (or were.)

I remember seeing a web page that compared the Getrag, F23, F35, and the F40. May have been one of "Fast Fieros" pages, before he fell off the earth with a bunch of peoples' money. If I find it, I'll post a link.

[GTRS Fiero]

A bit off-topic, but I believe the F40 is a 6-speed.  Fieruguru, lou_dias, and some others have done these swaps.  It'd be awesome with an LS4 in a Ford GT body.

[f85gtron]

I got a little greedy and upped the advance another couple degrees and mileage went down slightly, so, even under no load, there is a "too much".  No knocks where logged during this test. The sweet spot seems to be in the high 40's to low 50's degrees at light throttle.