Hi everyone,
I have a volvo 480 turbo with the following problem:
If l accelerate hard (pedal to the metal) from a lowish speed (for example from 20mph in second). The car begins to accelerate, positive turbo pressure builds. About half a second into this process the engine gives a little stutter or momentary hesitation before carrying on as if nothing has happened.
If l turn the boost down the problem seems less prevalent. I initially thought this could be the engine ECU boost pressure limiter kicking in, but l am also wondering if the fuel pump is unable to meet a sudden increase in fuel demand. Basically l don't know.
Any info would be gratefully received.
Dan
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bump,
Oh sorry, just dropped me world atlas.
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Don't worry Dan, I'll pick it up...
:)
Maybe the fuel/air mix is getting really screwed up - the turbo is pumping in the air, and its doing it faster than the ECU can detect/manage so the car runs lean, causing the blip in power.
You could also try boosting the fuel pressure by fitting a different pressure regulator to the fuel rail.
Other than that, go see a Volvo specialist!
Hope you get it sorted.
Dorian.
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Cheers Dorian,
I am thinking knackered fuel pump. Running lean is not ideal, er...bang!
I have seriously considered the uprated fuel presure valve. (affectionately known as a power boost valve amongst MaxPower fraternity). It appears to be considered as a waste of time akin to the ecotek valve and that ludicrous air intake fan device that appears to be 'supercharger' with all the efficacy of a hairdryer!
Some people have reported improvements but l am more tempted to instead uprate the fuel pump itself.
Thanks,
Dan
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But surely if you upgrade the fuel pump to supply more pressure, then the fuel pressure valve will have to work harder to keep the pressure at its current setting.
I worked with someone who fitted a power boost valve to his old Cavvie, and he said it did improve response (but did not improve power).
Sorry I can't be much more help but I reached the end of my car knowledge :(
How about an email/letter to one of the flyboy mags (e.g. MaxPower)?
PS - I prefer SuperBike - they have some lovely centrefolds...
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