LH JETRONIC conversion

[smithy]

I have finally converted my 360 to LH Jetronic. Iwas sick of everyone telling me that the LE would never cope with a modified b23. The LH is FANTASTIC. The power seems to be much more even. The response is almost instant. The only problem i am heving is a surging problem while coasting. I havn't installed the oxygen sensor yet so i hope that it will improve my coasting problem.

[Nikdev]

Great, did you convert from the bosh k-jet? or did you have an carb engine?

If you can out some pics out and describe how you did it? I am especially interested in the wiring issues

[foggyjames]

I think he was running LE-Jet before.

Sounds like it worked out well What did you use as a donor vehicle? I have a 940 loom here, but it has almost everything attached to it. I'm going to try to pick up a 240 LH2.4 loom, as that seems a lot more straightforward.

cheers

James

[Fuse]

What ignition do you run, did you have to change the flywheel?

[foggyjames]

LH2.4 and EZK are pretty closely connected, so I'll put a pint on it he's running the 60-2 pattern flywheel from the donor car.

cheers

James

[smithy]

The lh system i am using is the earlier one without the self diagnostic system. It is not quite as advanced but a lot more reliable. The lh2.4 has a lot of computer failures. With the earlier system the only things we ever replace are air mass meters and oxygen sensors. for the conversion i used the 360 injection loom. I cut it open and added the extra wires, then had the two wiring diagrams together and swapped the le and extra wires to the lh plug. The temp sensor & throttle switch are the same. I then swapped the air flow to air mass, the auxillary air valve to idle speed motor, rewired the fuel punp relays. The only thing i haven't done yet is welded the oxygen sensor adapter into the the exhaust. I am still running the renix ignition system. That is the mext thing to go.

[foggyjames]

Ah, I get you. I'm trying to work out exactly which system it is - what was the donor vehicle? US-spec 740 turbos (and later PRV V6s) ran LH2.2, but I thought you guys down under got Motronic for 740s turbos, the same as us.

Interesting about LH2.4 failures - we've not suffered many of those ourselves, and LH2.4 is the big thing here, now that chips are cheaply available...however I hope there aren't any nasties waiting around the corner!

cheers

James

[smithy]

The 86 to early 88 240's &740's ran an LH sysytem the same as the first 740 turbo's.
The 240's ran a chrysler ignition system and the 740's ran EZK.
The LH has a 25 pin computer. The lh 2.4 runs a 36 pin.
The LH2.4 system loses the fuel pump relay ground inside the computer, also we get a lot of slow idling problems. The greatest advantage was the self diagnosis system and the activation mode.

[foggyjames]

Now this is interesting - definitely market differences involved. Our 240s went straight from K-Jet (up to ~1990?) to LH2.4 (and shortly afterwards to LH3.1). The US got various other versions of LH, so I guess you guys have the same thing.

The reference to the 740 turbo has got me thinking. These ran LH2.2 in the US, while we had Motronic....and we both switched pretty much together to LH2.4. It sounds like you guys got a mixture of the two! I have a feeling the system you've put on the 360 must be 2.2, judging by the dates involved.

I'm not sure if we ever got them here, but some US 240s and 740s got the Chrysler ignition system (if I remember correctly they tend to call it Regina, but it's the same thing).

They certainly liked to chop & change a lot At least there's only really one setup for 360s!

cheers

James

[targa]

...and LH2.4 is the big thing here, now that chips are cheaply available...

Hi,
how do you mean that... how cheap and where ?

I'm trying to get my LH to have longer injection cycles in order to run on Ethanol.

Any hints ?

Thanks a lot.
/Tomas

[foggyjames]

Hi Tomas,

Have a chat to Fred (Frpe82) on Turbobricks - he makes chips especially for E85.

cheers

James

[targa]

Talked to him already... he doesn't really seem to be interested in N/A-SAABs (in my case).
/Tomas

[foggyjames]

Ah.....well I was talking about LH2.4 on Volvos I'm not sure what to suggest. Good luck with it!

cheers

James