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Old 04-27-2015, 09:30 AM
bjursingen bjursingen is offline
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Join Date: Oct 2013
Posts: 2
Default Problem whit the boost!

Hello friends!
I have problem whit the boost on my D24... Its a original D24S and i have put turbo on it but not changed the injection pump and the injectors! I got 1bars boost around 4500-5000rpm and its not so nice... Any ideas whats the problem might be?
Many thanks from Sweden!
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Old 04-27-2015, 12:17 PM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Northern Rockies
Vehicle: '86 745, '83 764
Posts: 1,035

Welcome to the forum!

Which problem are you trying to solve? Are you saying the boost pressure is too high and you want ideas on how to reduce it? Or are you saying that the engine doesn't have enough power even with all that boost?

If you're concerned about excessive boost pressure, check and make sure the larger hose on the turbo (going from the compressor housing to the wastegate actuator) is connected and not leaking. Stock boost pressure is ~10psi (=0.7 bar) for the non-IC motor so that is what you should see, assuming you installed a stock D24T turbo and have the wastegate hose hooked up.

If your concern is insufficient power at this boost setting, then your next step should be to install a turbo pump, which will give you the boost-responsive fueling you need to make use of that extra air. Intercooler will be important too if you plan to continue running elevated boost pressures. And, of course, all your basic "Stage 0" maintenance and engine condition factors (e.g. engine timing, valve clearance, compression, fuel and air filters, headgasket, etc) all need to be in good shape in order for the engine to perform at its best and stand up to the additional fuel and air you're planning to feed it.

An alternative to putting on a turbo pump, you could turn up the fuel on your stock non-turbo pump, but you'll suffer terrible smoke until the boost comes up, which is hard on the motor, other drivers behind you, air and water quality, etc. At most I would only do this just as a temporary experiment to see if it performs the way you want it to with some additional fuel -- it would not be a good permanent solution.
1986 745 D24T/ZF 340k
1983 764 D24T/M46 135k

Last edited by v8volvo; 04-27-2015 at 12:58 PM. Reason: unit conversion
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