really really crude for now.

http://daddyfadi.freehostia...gear_ratios_ver1.xls

Thats some really helpful info.

Suprising to see how fast the Econo Tranny is. Nothing is Faster other than the F-40!

176 MPH out of a 4 speed - Damn!

------------------

I am interested in finding the "283 dohc" manual trans information if anyone has it, or does it even exist?

That econo sure is cool, too bad we have already killed 3 of the 85/86 trannies with the manual 3800 swap, and I doubt the econo will be any stronger. I still dont like the 6speed's first gear, its still junk.

What do you guys think about the "racing F23 6speed"?

quote Originally posted by darkhorizon: What do you guys think about the "racing F23 6speed"?

If you trap higher than 115mph in the 1/4 you would run out of RPM (unless going to taller tire or build the engine for more RPM), plus having to row through all 6 gears within the quarter would hurt the ET.

The only 6 speed for me would be the 2002 - 2003 Nissan maxima 6 speed and even it is less than ideal.
1st 3.15
2nd 1.94
3rd 1.39
4th 1.06
5th 0.81
6th 0.63
FD 3.81

12.02 1st overall gear ratio is more torque friendly than the 3.65 4 speed (12.08) and a lot better than the Getrag (12.64)

2.40 6th overall gear ratio would turn fewer RPMs than the 3.32 econo tranny (2.42), Isuzu (2.48), and getrag (2.60).

Since I have a SBC, I already require an adapter plate, so someday I might just give this tranny a go.

[This message has been edited by fieroguru (edited 10-25-2007).]

It wont work.

quote Originally posted by rwr82: It wont work.

I love it when people say that without elaborating. =)

Fast Fiero's has a nice table;
http://www.fastfieros.com/N...nsmission_ratios.htm

quote Originally posted by Joseph Upson: Fast Fiero's has a nice table; http://www.fastfieros.com/N...nsmission_ratios.htm

Thanks for the mention of the chart... I had researched all this when the Ion came out in 04, but got really interested in 05 when the LSD was available from GM as a RPO... Here is the chart in a jpeg...




Also, it is the F25 that was a racing transmissions unless GM has used the F23 in the last 2 years and I have not managed to read about it. The F25 is from the Saab racing program in 98-02... quaife made the gear sets, and made this 5 speed into a 6 speed. There is a road racing gear set that would be a great daily driver ratio for a high torque application, but the top end speed is only about 140...

Loyde

so in that graph deal from fast fieros the second number down from the yellow numbers the only number not bolded thats the mph you can hold it to in that gear depending on your engine obviously. am i reading that right. so for the g6 you can go 41 mph at 7000 rpm i thought this tranny had a lame first gear that doesnt seem that bad

[This message has been edited by hammer18 (edited 10-26-2007).]

Now the next thing that would be great to have is a footnote on each as to where it bolts to the engine. (adaptor)
or requires axle mods.

Beyond that clutch or TO mods. noted.

Maybe not details just a footnote that a mod is required.

im guessing this quaife f25 6 speed is not the easiest tranny to find?

it sounds like a very good option though.

Ty

quote Originally posted by hammer18: so in that graph deal from fast fieros the second number down from the yellow numbers the only number not bolded thats the mph you can hold it to in that gear depending on your engine obviously. am i reading that right. so for the g6 you can go 41 mph at 7000 rpm i thought this tranny had a lame first gear that doesnt seem that bad

Turning a 3800sc or LSx to 7000 requires mods...So, that RPM was thrown out there for those with deep pockets, and want to get some more MPH per RPM... the average shift point on a 3800 is 6200 with a stock cam... the XP will get you to 6500, and the XPZ will get you to the 7000.. However, after you achieve 6500, you better have some heads, and valve train package that can handle it too.

The F25 I found was $20,000... it however came with 6 gear sets. The gear sets if custom cut by quiafe are $5000 per set.

At the time, I asked about cutting a custom set for the F35, and the quote was $15,000 per gear set... now, this included two new shafts, and the conversion to 6 speed on the F35... GM had just sent 10 F35 transmissions in to quaife to be converted to 6 speed transmissions, and start the gear selection process. This was about Nov 05 last I checked.

Loyde

My mistake... I posted F23, and it was the F35 I was dealing with.... F23 is a lighter duty transmission not used on the supercharged LSJ engines...

[This message has been edited by FastFieros (edited 10-26-2007).]

I took the racing trans info from loydes site, I found everything else myself, then just added it in.

[This message has been edited by darkhorizon (edited 10-26-2007).]

f35 for me please

quote Originally posted by Joseph Upson: Fast Fiero's has a nice table; http://www.fastfieros.com/N...nsmission_ratios.htm

man, if Quaife just eliminated the 5th gear from that custom F25 gearset they make, moved the 6th gear in place of 5th, and then added a real overdrive gear, around .65:1 or something leik that, then that tranny would be absolute perfection for all V8 and other high TQ swaps

The straight cut gears should whine like a supercharger too.

Updated 2008 MU3 / F35.... this one gets in the High HP / torque range nicely... http://www.fastfieros.com/N...nsmission_ratios.htm



Read about the new 08 Cobalt SS here > http://www.cobaltss.net/cobalt_ss_turbocharged/

Loyde

[This message has been edited by FastFieros (edited 10-28-2007).]

quote Originally posted by FastFieros: Updated 2008 MU3 / F35.... this one gets in the High HP / torque range nicely... http://www.fastfieros.com/N...nsmission_ratios.htm Read about the new 08 Cobalt SS here > http://www.cobaltss.net/cobalt_ss_turbocharged/ Loyde

ehhh.. that first gear is still terrible

It makes it very close to a fiero getrag, almost perfectly identical.

quote Originally posted by darkhorizon: It makes it very close to a fiero getrag, almost perfectly identical.

yeah, but the gearing isnt suitable for a V8 with monster TQ..

Ok, well whats better then? a 6speed is FAR worse than this, and the 4speeds are only slightly better. Honestly I think this is the best bet so far for a manual trans that will handle power, and not be designed for 7500 rpm shift points.

quote Originally posted by darkhorizon: Ok, well whats better then? a 6speed is FAR worse than this, and the 4speeds are only slightly better. Honestly I think this is the best bet so far for a manual trans that will handle power, and not be designed for 7500 rpm shift points.

the quaiffe f25 tranny has a fantastic 1st gear, and if they would only eliminate the 5th gear, move 6th to 5th, and add a decent overdrive gear in place of 6th, that would be a perfect tranny for a 3800SC or v8 swap..

Or moved the price somwhere under $20000

The gearing in the F23 sucks for power. First gear is hard to keep traction (on my crappy tires anyways), and my damn 25k mile spec3 doesn't hold on a 2nd gear launch. The worst part is that I'm shifting into 4th in the 1/8mi and its killing my times due to shifting. Currently, I'm trapping 87mph with a 1.8 60' and an 8.3et. As far as the strength of it however, I've been to the track three times beating the hell out of it and it hasn't acted funny yet. Couldn't say that for the isuzu.

I wonder if there is any interchangeability between the F23 and the F35 gear sets?

[This message has been edited by Jncomutt (edited 10-29-2007).]

Little update to this FWD ratio chart........... and what do we have today....... F35 converted to 6 speed transmission retaining stock gear and ring ratio..........or, if the pockets are deep enough, even a change can be made with that now.

Quaife emailed me today that the prototypes of the F35 conversions are ready. the intro price is $4000 for the conversion gear set, and that includes the following.........

synchromesh 6-Speed Conversion kit features semi-helical, high strength gears and is
designed to use the orignal linkage and mechanisms. The stock, or other factory F35 ring and
pinion is retained.
Includes: mainshaft, all main and counter gears, new end cover, and required linkage parts.
ratios 3.000 1.933 1.368 1.045 0.833 0.704
57.310.020 . . . . . . . . . . . . . . . . . . . . . . . reg $4395.00 . . . . . . . . special intro price $3995.00

ratios as follows......... http://www.fastfieros.com/N...nsmission_ratios.htm


Loyde

Ok, I still know of an econo car in Maine.... $500.00 Wish it were closer, or that he would pull the tranny for me : (