volvo b230 tuning on injection

The B230 made 130BHP on K-Jet, and the 2.0 made 120 on EFI. I've had both; first a 1991 740 2.0 EFI and then an '89 2.3 on K-Jet.

K-Jet isn't that bad, but people like jumping onto bandwagons, especially on a system that operates differently to most other systems, including other injection systems. Ask someone who hates carbs and they'll love injection, like David Walker does and vice versa. It does however have limitations for tuning.

I think for what you are trying to do, 200BHP sounds very ambitious; it took 16 valve heads, improvements elsewhere in the engine and so on to get engines to make close to those figures! I wish you good luck but it may not be easy! Nitrous would be one way to cheat however .

Slightly, the turbo head has sodium filled exhaust valves and the exhaust manifold/downpipe is very different. For the 940, the inlet manifold is the same, the turbo version has pipework from the turbo, through the intercooler then into the common intake. The injectors might be different sizes, but same fitting. The ECUs (one fuel and one ignition) are different (maps etc, the boxes are the same)




They do, but you say you've bought a carb engine which won't have the injector holes, or it might have the cast bosses for them, but not machined.

I personally don't like KJet - too many vacuum hoses etc. Had a nightmare with my old W123 280ce. The LH2.4 Jetronic is more sophisticated without being overly complicated and if you're not bound to either I don't see why you wouldn't choose the newer/better one



That's comparing apples and oranges, the M44 is 16v (138hp @6k rpm), the B230 is 8v (130ish @5k rpm)... You really have to help the top end flow of the 8v to get high NA power (e.g. throttle bodies, etc). Or find a 16v redblock engine from a 740GLE, it depends on the reasons why you have to keep the std intake!

well its going to get a cam, maybe bigger valves, and skimming to suit , get teh static compression up, for low down grunt. was talking to a guy i know in south wales who roads escorts etc, he was saying maybe not 200 bhp but defo more pulling power and usuable power, all the 4 cylinder bmws he has had on his rollers for rallying have been all revs.

So the 2.4, it can learn what to do? Is that to the extent that it can work out what fuel etc to give a full hit 2.3? I was thinking of adapting the bmw single cam management you see and getting it rollered. My m44 has been remapped, no point in after market ecus imho for my cause.

still not got the engine here, i need to take the head off and take it to the guy who built my last motor and see if he thinks its a good idea.

i dotn have but a 531 head is good for 200 bhp, also, reading some old emails the 2.4 is good for 200 bhp too..

My friend, he had a boat motor that was 2.5, he skimmed the head, standard exhaust cast manifold, split 50;s standard cam, and was 185 bhp. not sure what the torque was, that was on that welsh guys rollers.

I wonder how much torque a tuned motor does really...

Yes 44.1mm (I think that's right) Pinto inlet valves do fit, I know a chap on Volvoforums that has used these.

Also, given that Volvo made over 300bhp on their 240 race cars in the 80's on K-Jet, says a lot about bandwagons.

Hello,

Sounds like you tracked down an engine then? :-)

K-jet isn't too bad at all when setup properly, I had it on the majority of the old Golfs I used to play with. They were 1.8 or 2.0L 4 cyl (16v though) N/A, but with P&P head, and had no problem with around 180bhp with the standard injection that was originally intended for 139bhp. You need to be handy with measuring and tweaking the fuel pressure as I recall, no laptops required, it's old school. The white Mk1 ran over 190bhp for the previous owner on a rolling road day but you really needed to rev them as was the design of those engines.

Look forward to seeing how you get on with this project, surely you need torque more than bhp for your requirements anyway (I realise they are related) which an 8v engine will provide at lower rpm?

Stu

welsh, its a certain type of rallying, no turbo and standard injection systems!


Stu! Yes got one! I spoke to rae who built the motor in the car now, only had a few mins with him, he said the kjet isnt bad, its just setting it upf or what we want to do you need meters etc, just get it mapped on the motronic. He also said that the extra 300cc and the volvo engine would be like having a turbo to it, just brute pulling power. Needs a heavier flywheel than a revvy motor and will just pull and pull.

cant wait, call over if you are passing.

Is there a control unit of some sort for the ignition somewhere ? I don't know much about older Volvos but have seen early 80's cars that have electronic control of some sort for the ignition.

...with a (large) turbo



The crank sensor is used for diagnostics IIRC. I had a B230A car for spares and fitted the electronic ignition to my B21A, pretty simple Bosch system using the dizzy

yes, read here: link