F20/D20/F28 Revisited

Kadett1Ghz · Post by **Kadett1Ghz** » Sat Nov 06, 2004 1:16 pm

Hi,
i think there is a fault in the table. I think it should be :

F13 (4 speed)
---------------
Early Pontiac Lemans
Opel Kadett 1.6-1.3 / Vauxhall Astra 1.6-1.3
Opel Corsa

F16WR (wide ratio)
---------------
Opel/Vauxhall Kadett/Astra/Vectra 1.8-2.0 / 1.8-2.0 (C18NZ, C18NE,C20NE)
Pontiac Lemans/Daewoo Racer/Lanos

F16CR (close ratio, same as F20)
---------------
Opel Kadett GSI 8V/ Vauxhall Astra Mk2 GTE 8V(C20NE, 20SEH)
early Opel Kadett GSI 16V

[.....]

F25
---------------
Opel/Vauxhall Calibra/Vectra 2,5 V6 (C25XE, X25XE)

tango · Post by **tango** » Mon Nov 08, 2004 12:40 am

Read here:

F25

Post by **PrecisionBoost** » Mon Nov 08, 2004 5:21 am

here is the ultimate transmission resource page...... has gear ratios for all kinds of GM transmissions including the Aveo

It also shows the Lemans as having both an F16 and F13.... but a 5spd F13.

http://www.vibratesoftware.com/html_hel ... ssions.htm

here is some info on final drive ratios....

http://www.vibratesoftware.com/html_hel ... _axles.htm

( Optra, Aveo .... added at bottom of list)

Snail · Post by **Snail** » Sat Feb 26, 2005 9:39 am

Does anyone know of the gearbox that mated to the 18E (or F18E, 8v MPFI) that was in 86' to 90' model N13 Astra's? I think its the F16WR, can anyone confirm this for me?
Thanks in advance guys

Snail · Post by **Snail** » Thu Mar 03, 2005 12:02 pm

nobody knows?

daewooluvr · Post by **daewooluvr** » Thu Mar 03, 2005 2:52 pm

not I. Sorry.

MMamdouh · Post by **MMamdouh** » Thu Mar 03, 2005 2:54 pm

no idea whatsoever.

MMamdouh

Snail · Post by **Snail** » Thu Mar 03, 2005 11:52 pm

Ok, thanks anyway fellas

Snail · Post by **Snail** » Fri Mar 04, 2005 12:25 pm

oooo I found some info that might help my predicament

The 1.8 Astra GTE had an 18E (at least the one made between 1983-85 did). That mated to a F16 gearbox. Anyone want to take a stab in the dark and guess whether it was a Wide Ratio gearbox or a Close Ratio gearbox?

If not, who knows the difference between an F16WR and an F20 gearbox?

Thanks if you can help guys

EDIT: F18E engine mated to the F16CR gearbox

cielo20 · Post by **cielo20** » Tue Mar 29, 2005 8:28 pm

The f 16cr and f20 boxes are the same only the final drive is different f16cr(3.8:1) f20(3.5:1)final drive .f13 and f15 come out on diesel astras>
If you want a good setup you have to get a 16cr box open it up take out lay gears and drive fit every thing on the dawoo f16 lay gear and use the daewoo f16 housing with final drive as the one of the daewoo has a 4.19:1 final drive ! i use to have one but broke it as the speedo gear fell in the box and was pulled ip between gears while driving!
this setup will be good for 200kms in 5th but you get a good accelaration on all gears. i have to do anothe one

daewooluvr · Post by **daewooluvr** » Fri May 13, 2005 8:19 pm

cielo20 wrote:The f 16cr and f20 boxes are the same only the final drive is different f16cr(3.8:1) f20(3.5:1)final drive .f13 and f15 come out on diesel astras>
If you want a good setup you have to get a 16cr box open it up take out lay gears and drive fit every thing on the dawoo f16 lay gear and use the daewoo f16 housing with final drive as the one of the daewoo has a 4.19:1 final drive ! i use to have one but broke it as the speedo gear fell in the box and was pulled ip between gears while driving!
this setup will be good for 200kms in 5th but you get a good accelaration on all gears. i have to do anothe one

I've been interested lately in building a good 5sp tranny.
From what I'm reading I wanna get an F16CR(or D16CR) with a different final drive.
What about if I have higher hp (200-230whp) and a lightened flywheel?
Do you think the gears will be too close then?
Also, does anyone have any info on good clutches for the F16(or D16CR) that one would use with a higher hp engine?

kroz123 · Post by **kroz123** » Fri May 20, 2005 6:32 pm

I'm talking for the Automatic Transmission.

And what about the tranny model number for the 1.8L? (Chevy Optra)

It is said that the 1.8L engine is basicly the same as the 2.0L so what is the tranny number for the 2.0L if it is the same as the 1.8L.

Someone correct me if I'm wrong.

Thanx

ant0ny · Post by **ant0ny** » Fri Jun 24, 2005 1:57 pm

The f16 box is good for 190bhp at the flywheel anything over that you need to go to the f20..
The f20 has bigger bearings (and maybe bigger shaft) but I know you can machine the f16 to take the f20 internals. I can get more info on that if needed.. a friend of mine did it to his rally car.

Antony

cpd · Post by **cpd** » Mon Dec 19, 2005 6:11 am

Need... F28 + C20LET.

Question, is it hard/expensive for them to shift an F28 + C20LET to FWD? Cause I'd assume it'd be more expensive to get my FWD made a 4x4.

jonlint · Post by **jonlint** » Thu Dec 22, 2005 9:10 pm

I am new to the forum, and I do not own a Daewoo but know Vauxhall Astras very well. I am scheming to build a rally Daewoo Lanos in the US, and I would like to know if anyone has the gear ratios and final drive ratio for the manual transmission 1.6L DOHC US-spec Lanos.

I am seeing conflicting information on the gear ratios for the US-spec 1.6L manual Lanos. The parts manual found on here shows a FD ratio of 3.72, but when I check on www.daewoous.com on their online parts ordering system, it shows only the 4.176 FD gear is available and for the transaxle as a complete part is shows "4.176 W/R" in the comments.

Could I ask a big favor of anyone with a US-spec Lanos - could you look through any brochure or owner's manual you have to see if any gear ratios are listed?

Thanks in advance for any help with the above.

Jonathan Linton

The original daewootech forum

F20/D20/F28 Revisited

gear ratio

Re: gear ratio