Citroen CX GTI Turbo Engine Management

Citroen CX GTI Turbo Engine Management

Author
Discussion

Bilkob

Original Poster:

75 posts

102 months

Sunday 5th April 2020
quotequote all
I’m new on here and realise the above is slightly left field but I’ve owned a fair few and can’t kick the habit..
I’m after some technical advice here
These cars are wonderful whooshy cruisers and although not fast by modern standards do have a surprising turn of wafty torque
I have a nice Series 2 Turbo 1( non intercooled) that I use (or did..!) for charging off to Belgium and France to watch bike racing and repatriate beer and its great, but I’ve always wanted to make an updated/ ultimate one. To that end I’ve acquired a late Turbo 2 (intercooled) car for a full restoration/build. It’s remarkably solid and I know my way around them mechanically and the steering and suspension aren’t as scary as some would believe
So- what I really need advice on is engine management/ECUs......
The standard stuff ,Bosch K-jetronic is now 30 +years old and the weak link to more grunt/better running. These engines are crude but very understressed, 170ish bhp and 215 ft/lbs from a turbo 2.5 4 pot is quite tame
I’d like somewhere in the region of 220 bhp and associated torque increase.
Are there any thoughts on modern stand alone ECUs that could run both ignition and fuel and be adapted to fit this engine/car. I’m fairly good mechanically and have a superb auto electrician so any clues/tips/advice would be greatly appreciated.
Something to do anyway.......

traffman

2,256 posts

176 months

Sunday 5th April 2020
quotequote all
Hi , i owned a Blue Series 2 Gti Turbo purchased from Oxford , was a great drive back up to Falkirk!
Sadly sold it on now , i did find the steering quite nervous , i know its 2.5 turns lock to lock . Apart from that it was beautiful. My dad owned a Cx Athena back in 1982. Thats why i love them so much.

Anyhow , take a look at Harrys Garage on Youtube , theres a guy that was rebuilding Harry Metcalfes Espada engine. Anyway the mechanic owns a Nice s1 that hes currently selling. He has turned the boost up on his and knows a lot about these wonderful cars.

Maybe try and drop him a line? Ill go and find out his details .

Vickers_VC10

6,243 posts

172 months

Sunday 5th April 2020
quotequote all
Readers car thread please. One of my favourite ever Citroëns.

traffman

2,256 posts

176 months

Sunday 5th April 2020
quotequote all
His Youtube channel is Ken Tyrrells . He is currently selling his S1 cx turbo

Bilkob

Original Poster:

75 posts

102 months

Sunday 5th April 2020
quotequote all
Thank you already! I’ll try and contact that S1 owner but I think that car is still on original Bosch stuff....

waynecyclist

1,492 posts

81 months

Sunday 5th April 2020
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LarJammer

1,966 posts

177 months

Sunday 5th April 2020
quotequote all
To replace the Bosch setup is going to involve a lot of work if you want to go 'modern'. But I'm sure it would be a very interesting project. The biggest hurdles are likely to be the requirement for a crank sensor and a different injector / fuel rail setup. You could try searching the megasquirt forum for similar conversions.

Pete54

62 posts

77 months

Sunday 5th April 2020
quotequote all
Suggest you get in touch with Nard Renard in the Netherlands. He developed a Megasquirt application for the SM, improved in;et arrangements and has a CX2500 petrol/lpg Megasquirt conversion in a DS!

Google Renard motors nl

Bilkob

Original Poster:

75 posts

102 months

Sunday 5th April 2020
quotequote all
Thank you for the replies, really useful but keep them coming please. Yes, I suspect that the crank sensor will be a hurdle although the car does have one but I’m led to believe that the number of teeth is incorrect.....?
I THINK the std fuel system, pump, rail, injectors is ok for the sort of power I’m after
Amy more ideas on stand alone systems very gratefully received

stevieturbo

15,488 posts

214 months

Sunday 5th April 2020
quotequote all
Bilkob said:
I’m new on here and realise the above is slightly left field but I’ve owned a fair few and can’t kick the habit..
I’m after some technical advice here
These cars are wonderful whooshy cruisers and although not fast by modern standards do have a surprising turn of wafty torque
I have a nice Series 2 Turbo 1( non intercooled) that I use (or did..!) for charging off to Belgium and France to watch bike racing and repatriate beer and its great, but I’ve always wanted to make an updated/ ultimate one. To that end I’ve acquired a late Turbo 2 (intercooled) car for a full restoration/build. It’s remarkably solid and I know my way around them mechanically and the steering and suspension aren’t as scary as some would believe
So- what I really need advice on is engine management/ECUs......
The standard stuff ,Bosch K-jetronic is now 30 +years old and the weak link to more grunt/better running. These engines are crude but very understressed, 170ish bhp and 215 ft/lbs from a turbo 2.5 4 pot is quite tame
I’d like somewhere in the region of 220 bhp and associated torque increase.
Are there any thoughts on modern stand alone ECUs that could run both ignition and fuel and be adapted to fit this engine/car. I’m fairly good mechanically and have a superb auto electrician so any clues/tips/advice would be greatly appreciated.
Something to do anyway.......
Really...there are dozens of ecu's.

Pick your tuner, and use whatever they can give you the best outcome with within your budget.


Bilkob

Original Poster:

75 posts

102 months

Sunday 5th April 2020
quotequote all

Here’s my current T1

Bilkob

Original Poster:

75 posts

102 months

Monday 6th April 2020
quotequote all
So, can anyone recommend a few ECUs as a starting point?

GreenV8S

28,859 posts

251 months

Monday 6th April 2020
quotequote all
Bilkob said:
So, can anyone recommend a few ECUs as a starting point?
Who is going to tune it? That is the more important decision.

Bilkob

Original Poster:

75 posts

102 months

Monday 6th April 2020
quotequote all
So, almost unbelievably I have around a tuning, ecu supplier who owns the exact same car as me and had always wanted to do this!!
Emerald tuning, they already seem knowledgeable and have a diner car to check everything against

E-bmw

6,197 posts

119 months

Monday 6th April 2020
quotequote all
Bilkob said:
have a diner car to check everything against
So are you going there for a meal then?


stevieturbo

15,488 posts

214 months

Monday 6th April 2020
quotequote all
Bilkob said:
So, almost unbelievably I have around a tuning, ecu supplier who owns the exact same car as me and had always wanted to do this!!
Emerald tuning, they already seem knowledgeable and have a diner car to check everything against
If going with Emerald themselves, I'm sure you're in safe hands.

E-bmw

6,197 posts

119 months

Tuesday 7th April 2020
quotequote all
There's an echo in 'ere....in 'ere....in 'ere....

Bilkob

Original Poster:

75 posts

102 months

Sunday 14th June 2020
quotequote all
Quick update on my increasingly rabbit hole like GTI Turbo project
Emerald Tuning (who have been superb to deal with) now have their car up and running on their ECU, completely bypassing all the Bosch/Citroen wiring and boxes. An initial Dino run on std boost has resulted in 200bhp and 250lbs/ft of torque, not too shabby as a starting point.
In the meantime I’ve taken the engine out of mine (what a hoot that was!) in preparation for new clutch, engine bay re-pipe and the fitting of a diesel T2 gearbox for longer gearing.
This is all a bit daunting at times but I’m in too deep now to not keep going........

Bilkob

Original Poster:

75 posts

102 months

Thursday 31st December 2020
quotequote all
Update.....
I’ve made lots and lots of progress over the summer and autumn but have been at the mercy of the weather and work and all sorts of outside stuff....
Anyway, the bespoke loom and ECU and coil sticks etc turned up today, so I’ll approach the new year with renewed vigour

rickygolf83

206 posts

128 months

Tuesday 5th January
quotequote all
Very interesting project this, good luck!