PLEASE help- Jetronic or motronic

Post Wed Jul 20, 2005 1:32 am

Hi guys need some fairly urgent advice please:

I currently have an 87 jetronic car which I was going to prep to race in the miltek (basically no engine mods allowed).

Would I be better to get a motronic car to race or not? what is the real difference?

Does anyone have torque curves for both??

All this bearing in mind all the other cars are motronic in the series.

Thanks

Jimmy

Post Wed Jul 20, 2005 3:18 pm

Motronic cars are more tuneable because they have more sensors and thus more variables to adjust. The Jetronic can only be mapped for fuelling I believe. Not a very technical answer I know! I know you're not supposed to have any modifications in this series but does that include remapping? If you can remap then you will be at a disadvantage against Motronic engines.

Post Wed Jul 20, 2005 3:45 pm

No remapping is not allowed. After getting some advice from Dave Keal I have decided to stick with it- all I really need to do is change the diff and I wont be mucg different to the others think couple bhp.

Does the jetronic and motronic refer to the ECU??

Post Wed Jul 20, 2005 3:48 pm

JimmyC wrote:No remapping is not allowed. After getting some advice from Dave Keal I have decided to stick with it- all I really need to do is change the diff and I wont be mucg different to the others think couple bhp.

Does the jetronic and motronic refer to the ECU??

thing is the earlier lumps had higher compression

if you service it well and treat it right it'll prob be pushing out very close to 171bhp

Post Wed Jul 20, 2005 3:58 pm

I like the sound of that

its only got 94k on the clock and is a sweet runner.

whats the torque curve like between the 2?

Post Wed Jul 20, 2005 6:04 pm

Motronic refers to the whole engine management system with the ECU as its nerve centre. The sensors give the information and the map in the ECU controls all the engines functions - fuel intake, air intake, timing, etc relative to temp and conditions, etc.
The older engines did indeed have a higher compression ratio and there are many who would argue that they were faster than a standard Motronic one.
Good luck with the racing. Love doing track days but have never raced. Probably getting too old for that now!!

Post Thu Jul 21, 2005 8:11 am

JimmyC wrote:I like the sound of that its only got 94k on the clock and is a sweet runner.

whats the torque curve like between the 2?

no idea on the torque curve comparisons mate-never run the 2 side by side.

have a gander on google and see-some one is bound to have done it!

use babelfish for translations if req'd!

good luck and report back

Post Thu Jul 21, 2005 8:27 am

jetronic? cant be a 325 then...they were all motronic, even the early ones

is it a 323? if so....keep the l jet....timing can be advanced via the distributor....its good

. motronic cant really do any adjustments

Post Thu Jul 21, 2005 8:46 am

Its a 320, I am keeping it now, nearly finished stripping and ready for a cage to go in- will be ordering seat with ears tomorrow, and extinguisher is here.

Getting excited now