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Is the coil hooked up right?
I had one 240T that was the slowest 240T I'd ever driven with a coil hooked up backwards. Took forever to figure it out.
But it would really sputter at 7-8psi (though oddly smoothly).
What's the pressure at now? 84psi? What's the warm control pressure? 50ish at sea level or whatever?
I hate K&Ns and wouldn't use them on anything! Fine beach sand and the like goes right through them and can cost you an engine! And with a bunch of oil on them they're a pain to clean and probably more restrictive than just a clean paper filter. I'll just keep buying Mann/ Mahle made in germany dusty shelf paper filters and never worry!
You have Mercedes injectors and a stock exhaust?
Did you say that before?
Thought the fuel system was stock...yeah the pop-off pressure is higher on those.
The stock Benz has one pressure pump gravidty fed from the tank feeding another pressure pump...
I wouldn’t expect your stock fuel pumps/tank arrangement/relays to last long with the pressure set above 95psi or provide stable consistent free pressure or components (like the WUR and/or frequency valve) to last very well from experience.
Id restore it to stock injectors unless you go way more wild with a larger exhaust and better intercooler etc, but to each their own.
All you’re really doing is just stressing the already marginal Volvo pump/relay/wiring arrangement out/hurting longevity with the line pressure set to 95psi, hurting fuel economy and longevity and under/over fueling it.
Also, the Benz injectors are probably fairly worthless for increased flow rate over stock 240TURBO depending on the part #.
Porsche 944Turbo are about the highest flow rate per cylinder injectors for CIS/K-jet Cars commonly/mass produced if you want to torture yourself turd polishing 240turbk k-jet for more power...
What about the Control pressure? You resolved that?
700T tank pump and the dual Benz pumps and a surge tank and/or old style tank no lift pump and Dual pressure pumps in series can help a lot.
One of the big 2 limitations of the 240TURBO Kjet is that it doesn?’t scale injector or line pressure to manifold pressure or control pressure to manifold pressure for boosted applications like say a Porsche 930, 944Turbo or Audi turbo coupe of the day.
Also there?’s a big flap restricting air intake flow...duh/
In reality if you improve the flow of the engine it?’ll make more power for less boost (head work, 90+ manifold, exhaust, exhaust housing or the turbo (cosworth or atp or different turbo) and stock intercooler really choke them a lot) and you?’ll actually probably want to run LESS line pressure is what I found once you address those needs. No point really changing the camshaft from the stock T with k-jet and all those restrictions either imo. All you?’re really doing is hurting economy, emissions, and usable power with almost no usable gains.
Further, you can make it plenty if not even a little over-fueled with that setup at stock 84psi line pressure (if that) with a better flowing engine at which point you?’ll eventually be lifting the airflow plate all the way up in the stock fuel dist at stock control pressure (even if you do hack/tweak s manifold pressure reference on it somehow).
Beyond that,
You?’d need a UTCIS (or moral equivalent) stripper motor controlled bigger fuel dist (semi-modern method) or to hack a higher capacity fuel dist/reshaped airflow plate bowl into it somehow or other with more flow capacity like the v8 Benz fuel dist or whatever (old school way) if one is insistent on costly/torturous kjet turd polishing,
They went thru so many variations to make the grp-a cars work right and hated it but had to keep kjet for rules. Forget about fuel economy (which was always marginal unless you drove a stick shift 240TURBO gently anyway), emissions and/or playing nice with cams with any reversion
But to each their own...
Not trying to be a jerk, just my own experience torturing myself with kjet 240Ts and futilitarian pursuits...
Glad you have it sorted out. You mean you know Tom Smith? His 240 turbo build is badass kjet. He used to post here a long time ago. If you really want big power with kjet. He can show you the way.
A little bit of tuning like you mention is decent and then above that you go with efi is the general accepted path as you know. I have enjoyed my 82 240 turbo with some moderate tuning for a long time. Mileage, no. Fun, yes. Awesomely fast, no but does keep up with traffic. I'm probably going to put efi in it sometime. But my 81 will stay stock kjet.