Possible aternative gearboxes for Citroen CX Gti Turbo

An area for all matters concerning the Citroen CX.

Moderator: RichardW

pgibbinson
Posts: 1
Joined: 13 Oct 2017, 22:30

Possible aternative gearboxes for Citroen CX Gti Turbo

Post by pgibbinson »

Hi All,
Don't want to open a can of worms etc but just browsing to find if anyone else has got any experiences with swapping out the standard CX GTI Turbo box ? Already thinking of dropping in a DTR Turbo II box to stretch out the revs. Are there any other 6 speed boxes that have been used with the M25 block ? Citroen Relay vans appear to have a 6 speed but am presuming the ratios would all be much lower.

All comments very much appreciated
grumpy dad
Posts: 3
Joined: 19 May 2024, 22:56

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by grumpy dad »

Hi at the moment I can't help but I am looking for the same thing
Could a engine and gear box be possible?
There seams to be very little out there in the way of information for anything
Are these cars not modified ?
User avatar
CGATCX25GTITURBO
Posts: 288
Joined: 21 Nov 2010, 11:58
x 12

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by CGATCX25GTITURBO »

Depends what work you can do yourself, if you have a known good gearbox..

T1 mods
You can drop in a Diesel T2 crown and pinion in yours.
T2 petrol Crown and pinion too will fit.

The limitations of sticking a T2 petrol or diesel gearbox straight in is the ignition set up and the thin sensors of the T1 needing a hole for the sensor to fit... drill a hole, but bear in mind it needs to be accurate as there isn't any timing adjustment available.

Soo top gear 1000 rpm
T1 petrol 25
T2 petrol 27
T2 diesel 29. Something.

Limitations on fitting another gearbox will be how it mounts.
5 speed CX resting on edge of the subframe and flush with the inner wheel arch, any protrusion will bollox stuff.

Give it a go :)
Neil aka CGAT
1986 CX25 GTI TURBO 1 SERIES 2 'CGAT'
1998 XANTIA 19TD ESTATE
1987 BX19 GTI 8V
2012 Citroen DS3
1997 600 Bandit
2000 ZX12R from new
1989 CX GTI Turbo 62k miles in a barn since 2001, project started 2023.
User avatar
CGATCX25GTITURBO
Posts: 288
Joined: 21 Nov 2010, 11:58
x 12

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by CGATCX25GTITURBO »

Standard.
inbound5435275179835480987.jpg
Neil aka CGAT
1986 CX25 GTI TURBO 1 SERIES 2 'CGAT'
1998 XANTIA 19TD ESTATE
1987 BX19 GTI 8V
2012 Citroen DS3
1997 600 Bandit
2000 ZX12R from new
1989 CX GTI Turbo 62k miles in a barn since 2001, project started 2023.
grumpy dad
Posts: 3
Joined: 19 May 2024, 22:56

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by grumpy dad »

Hi CGAT
Is that nos I see on yours very nice
In your reply you give different diff ratios
Just what I wanted
You say t1 or t2 if I put citroen cx t 2 in to google I get nothing
Can you please give us more information
about how to find them
Thanks
User avatar
CGATCX25GTITURBO
Posts: 288
Joined: 21 Nov 2010, 11:58
x 12

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by CGATCX25GTITURBO »

T1 is CX25 GTI Turbo 1 and T2 is... Turbo 2.
Neil aka CGAT
1986 CX25 GTI TURBO 1 SERIES 2 'CGAT'
1998 XANTIA 19TD ESTATE
1987 BX19 GTI 8V
2012 Citroen DS3
1997 600 Bandit
2000 ZX12R from new
1989 CX GTI Turbo 62k miles in a barn since 2001, project started 2023.
grumpy dad
Posts: 3
Joined: 19 May 2024, 22:56

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by grumpy dad »

Hi
Great information thanks
do you think I could get the diff bits or do you think I will have to buy a second hand gearbox
If it second hand gearbox box is it just Ebay or can you recommend someone else

Thanks
User avatar
CGATCX25GTITURBO
Posts: 288
Joined: 21 Nov 2010, 11:58
x 12

Re: Possible aternative gearboxes for Citroen CX Gti Turbo

Post by CGATCX25GTITURBO »

These things are that old now, if you open the box, you're going to have to likely rebuild it.
Try find a Turbo 2 diesel box, it's not blisteringly different to drive. I'd keep that as it is and buy a quicker car.
Just my observations after owning mine for 36 years tuning it to a inch of it's life.
Then experiencing 450hp Meganes S2000s and now my SL55.

Look up a gent called Stan Platts he generally has loads of CX stuff.
Should have the box you're looking for.
Neil aka CGAT
1986 CX25 GTI TURBO 1 SERIES 2 'CGAT'
1998 XANTIA 19TD ESTATE
1987 BX19 GTI 8V
2012 Citroen DS3
1997 600 Bandit
2000 ZX12R from new
1989 CX GTI Turbo 62k miles in a barn since 2001, project started 2023.