Any SE Saab PHers up for RR day?
Discussion
And can I get any more abbreviations in the title?
Thinking about going down to Vixpy1's rolling road in Surrey for the day coming up, but will I be the only Saab there!?
Anybody else interested?
www.pistonheads.co.uk/gassing/topic.asp?t=150478&f=23&h=0
Thinking about going down to Vixpy1's rolling road in Surrey for the day coming up, but will I be the only Saab there!?
Anybody else interested?
www.pistonheads.co.uk/gassing/topic.asp?t=150478&f=23&h=0
Well I went along and did this in the end, but got a bit of a disappointing result - 152bhp 
It's a nice flat torque curve, just over 150ftLb dead flat between 3500 and 5500 rpm, but that doesn't explain why it's 20-30bhp down on what it should be.
Just had a big service, running very nicely on optimax, no hiccups, boosting into the red. Engine's only on 125k miles. Any of the experts (matt/eric?) do any distance diagnosis?
My only thought was that they were 3rd gear runs and I don't always seem to get max boost in 3rd - could this be it?
>> Edited by NiceCupOfTea on Sunday 20th February 13:24
It's a nice flat torque curve, just over 150ftLb dead flat between 3500 and 5500 rpm, but that doesn't explain why it's 20-30bhp down on what it should be.
Just had a big service, running very nicely on optimax, no hiccups, boosting into the red. Engine's only on 125k miles. Any of the experts (matt/eric?) do any distance diagnosis?
My only thought was that they were 3rd gear runs and I don't always seem to get max boost in 3rd - could this be it?
>> Edited by NiceCupOfTea on Sunday 20th February 13:24
NiceCupOfTea said:
Well I went along and did this in the end, but got a bit of a disappointing result - 152bhp
It's a nice flat torque curve, just over 150ftLb dead flat between 3500 and 5500 rpm, but that doesn't explain why it's 20-30bhp down on what it should be.
Just had a big service, running very nicely on optimax, no hiccups, boosting into the red. Engine's only on 125k miles. Any of the experts (matt/eric?) do any distance diagnosis?
My only thought was that they were 3rd gear runs and I don't always seem to get max boost in 3rd - could this be it?
>> Edited by NiceCupOfTea on Sunday 20th February 13:24
Combination of the timing being off and a weak wastegate actuator, when you say boosting into the red how quickly does it reduce down and to what level (mid yellow?)
Matt
NiceCupOfTea said:
when i back off the gas the needle drops straight away...
and it drops right back down
>> Edited by NiceCupOfTea on Sunday 20th February 13:52
Ah I meant at high rpm/load does the boost tail off as the rpm increases?
BTW Its Matt but I've nicked Slinkys laptop. Only just noticed I'm logged in on the wrong account
>> Edited by slinky on Sunday 20th February 13:57
You sure that is a flywheel corrected number? I ask that 'cause max torque should be in the 200 lb/ft range, not barely over 150 - and peak torque is more directly related to boost normally because at the kind of rpm max torque happens, flow restrictions/fueling issues etc. are not an issue yet. And as you;re reporting the boost gauge -does- get into the red zone, and there are no real running issues on the road...
The usual mode for turbo cars that post disappointing peak hp numbers, is good torque at lower rpm that tails off rather too quickly, and max power happening at too low rpm.
The usual mode for turbo cars that post disappointing peak hp numbers, is good torque at lower rpm that tails off rather too quickly, and max power happening at too low rpm.
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