Hello peeps,
Well it's been a while since I posted in these parts, but you're such nice peeps I thought you might be kind enough to give me your opinion on a little problem I have.
Had a few bits and bobs like shocks, aircon pump, rad fans, cam cover gasket replaced under warranty, but today - literally 3 years minus one day from delivery date (with no chance of getting it to a dealer tomorrow) it has developed a small problem.
Car is late 2002 Cupra R (210)
Revo (can't remember exact settings, but pretty aggressive - only ever drunk Optimax - Bill might be able to remember what he set me at, but I doubt it, that was 2 and a half years ago
). Also has forge piston DV and a dynatwist.
Revo second code version - the one that fixed the dead spots problem and pushed the peak torque up the revs a bit - updated thanks to the nice chaps at Big Boys Toys
If you listen to the induction it has always sounded nice and whooshy, and at peak torque round 3000rpmish with foot to floor it screams. On my way up the motorway today I noticed that at exactly that point of peak torque it now cuts boost dramatically jus after the screaming starts, but only for a fraction of a second, maybe a tenth ? This is really noticable, the screaming sounds stops and kind of makes a soft thud sound and the car noticeably "bumps" with such sudden loss and regaining of boost pressure, then comes straight back with the boost. It will do this between one and 5 or six times up to about 4500 revs. Above that it is absolutely fine. Quite unpleasant
I'm not convinced the turbo is actually stalling as the power comes back so fast, but maybe at that exhaust rate it spins up very fast ?? Am I losing air somewhere from a faulty valve ? Can't just be a hole I'm guessing or there would be general lack of boost which there isn't except for that fraction of a second. Had the problem in 3rd-6th gear.
The ONLY way to actually get the problem to happen is get the revs below about 2500 revs, then accelerate fairly hard (not even foot to floor) and as it goes through about 3000 the staccato boost loss hits. If it is already at 3000 on the nose and you floor it, I guess as the turbo isn't going so fast (youve not had your foot on the throttle until that moment) the problem does not happen.
Unsurprisingly with revo off, problem goes away... Have checked hoses etc briefly but was on way to Brum for a meeting so couldn't really check properly. Maybe I should check the DV as well as I haven't looked at it for 10K miles or so, although it doesn't sound like a dump when the problem hits - actually it did, but only once in the 10 or 15 times it happened.
Any hints of where to start ? Revo bods in particular ?
sorry if that was a bit war and peace, but wanted to give all the detail I could.
Thanks m'dears.
Well it's been a while since I posted in these parts, but you're such nice peeps I thought you might be kind enough to give me your opinion on a little problem I have.
Had a few bits and bobs like shocks, aircon pump, rad fans, cam cover gasket replaced under warranty, but today - literally 3 years minus one day from delivery date (with no chance of getting it to a dealer tomorrow) it has developed a small problem.
Car is late 2002 Cupra R (210)
Revo (can't remember exact settings, but pretty aggressive - only ever drunk Optimax - Bill might be able to remember what he set me at, but I doubt it, that was 2 and a half years ago
). Also has forge piston DV and a dynatwist.Revo second code version - the one that fixed the dead spots problem and pushed the peak torque up the revs a bit - updated thanks to the nice chaps at Big Boys Toys
If you listen to the induction it has always sounded nice and whooshy, and at peak torque round 3000rpmish with foot to floor it screams. On my way up the motorway today I noticed that at exactly that point of peak torque it now cuts boost dramatically jus after the screaming starts, but only for a fraction of a second, maybe a tenth ? This is really noticable, the screaming sounds stops and kind of makes a soft thud sound and the car noticeably "bumps" with such sudden loss and regaining of boost pressure, then comes straight back with the boost. It will do this between one and 5 or six times up to about 4500 revs. Above that it is absolutely fine. Quite unpleasant
I'm not convinced the turbo is actually stalling as the power comes back so fast, but maybe at that exhaust rate it spins up very fast ?? Am I losing air somewhere from a faulty valve ? Can't just be a hole I'm guessing or there would be general lack of boost which there isn't except for that fraction of a second. Had the problem in 3rd-6th gear.
The ONLY way to actually get the problem to happen is get the revs below about 2500 revs, then accelerate fairly hard (not even foot to floor) and as it goes through about 3000 the staccato boost loss hits. If it is already at 3000 on the nose and you floor it, I guess as the turbo isn't going so fast (youve not had your foot on the throttle until that moment) the problem does not happen.
Unsurprisingly with revo off, problem goes away... Have checked hoses etc briefly but was on way to Brum for a meeting so couldn't really check properly. Maybe I should check the DV as well as I haven't looked at it for 10K miles or so, although it doesn't sound like a dump when the problem hits - actually it did, but only once in the 10 or 15 times it happened.
Any hints of where to start ? Revo bods in particular ?
sorry if that was a bit war and peace, but wanted to give all the detail I could.
Thanks m'dears.
