rolling road figures
Discussion
I am sticking the AS on a rolling road on Saturday to see just what I have got...
they wil test and I quote.......
"Each power run will then consist of the following:
1. One gearing run to allow the rollers and software to ascertain loss factors at the wheels.
2. Two power runs will then be made taking the vehicle initially to the redline and then backed off if the power curve dictates for the second run.
You will then receive a graph detailing the following:
1. Brake Horsepower at the Flywheel
2. Torque at the Flywheel
3. Drag co-efficient - allowing you to calculate loss through the drivetrain and show BHP at the wheels
4. Air/Fuel Ratio curve throughout the run.
The main fan used simulates 75mph winds into the front of the vehicle. In addition we have upto six fresh air points that allow us to blow air onto different areas of the car (rear engined intercoolers, etc). The exhaust gasses are then vented by another fan at the rear of the vehicle."
I realise the car won't be near the TVR figures but waht might I expect ormore to the point when do I need to
panic.
will report back but forewarned is ....... giving me a clue!!
by the way it is a S3c with cats.....but I think it sounds fine!!!
they wil test and I quote.......
"Each power run will then consist of the following:
1. One gearing run to allow the rollers and software to ascertain loss factors at the wheels.
2. Two power runs will then be made taking the vehicle initially to the redline and then backed off if the power curve dictates for the second run.
You will then receive a graph detailing the following:
1. Brake Horsepower at the Flywheel
2. Torque at the Flywheel
3. Drag co-efficient - allowing you to calculate loss through the drivetrain and show BHP at the wheels
4. Air/Fuel Ratio curve throughout the run.
The main fan used simulates 75mph winds into the front of the vehicle. In addition we have upto six fresh air points that allow us to blow air onto different areas of the car (rear engined intercoolers, etc). The exhaust gasses are then vented by another fan at the rear of the vehicle."
I realise the car won't be near the TVR figures but waht might I expect ormore to the point when do I need to
panic. will report back but forewarned is ....... giving me a clue!!
by the way it is a S3c with cats.....but I think it sounds fine!!!
If your car is in sound condition and well maintained then as far as I'm concerned there's nothing to worry about.
However there is always a element of risk when you are taking the car to it maximum potential, particularly if you never used it yourself
, it could be in uncharted territory so to speak.
Harry
However there is always a element of risk when you are taking the car to it maximum potential, particularly if you never used it yourself
, it could be in uncharted territory so to speak. Harry
Seeing your P&J on the rollers for the first time is a bit
… but these guys know what they're doing, and I had faith in Paul at Austec when mine was done. After a while you learn to just watch and listen to your car, and think, jeez… it sounds 
Oh, and if the figures are rubbish, then go to Austec and get "the full Podie"…
My S3 gave someting like 135 BHP at the wheels, 179 at the flywheel (calculated) at Power Engineering in 1998.
I remember seeing the 135 figure and thinking, hey, I've been robbed - then they showed me the flywheel figure and I was well pleased.
This was after about an hour tweaking and fettling the throttles (hole in one butterfly plugged, timing tweaked and I had already cleaned the plugs and set the tappets to spot on or -1 thou on min recommended.
I had also changed oil and filter about 300 miles previously and cleaned air filter, throttles and air by-pass v/v.
Since then the car has showed 199 BHP flywheel (152 at the wheels), but at a different albeit seemingly reliable road. this was after a bit of judicious rebuilding, polishing and porting, etc
Marcus
I remember seeing the 135 figure and thinking, hey, I've been robbed - then they showed me the flywheel figure and I was well pleased.
This was after about an hour tweaking and fettling the throttles (hole in one butterfly plugged, timing tweaked and I had already cleaned the plugs and set the tappets to spot on or -1 thou on min recommended.
I had also changed oil and filter about 300 miles previously and cleaned air filter, throttles and air by-pass v/v.
Since then the car has showed 199 BHP flywheel (152 at the wheels), but at a different albeit seemingly reliable road. this was after a bit of judicious rebuilding, polishing and porting, etc
Marcus
My S3 gave someting like 135 BHP at the wheels, 179 at the flywheel (calculated) at Power Engineering in 1998.
I remember seeing the 135 figure and thinking, hey, I've been robbed - then they showed me the flywheel figure and I was well pleased.
This was after about an hour tweaking and fettling the throttles (hole in one butterfly plugged, timing tweaked and I had already cleaned the plugs and set the tappets to spot on or -1 thou on min recommended.
I had also changed oil and filter about 300 miles previously and cleaned air filter, throttles and air by-pass v/v.
Since then the car has showed 199 BHP flywheel (152 at the wheels), but at a different albeit seemingly reliable road. this was after a bit of judicious rebuilding, polishing and porting, etc
Marcus
I remember seeing the 135 figure and thinking, hey, I've been robbed - then they showed me the flywheel figure and I was well pleased.
This was after about an hour tweaking and fettling the throttles (hole in one butterfly plugged, timing tweaked and I had already cleaned the plugs and set the tappets to spot on or -1 thou on min recommended.
I had also changed oil and filter about 300 miles previously and cleaned air filter, throttles and air by-pass v/v.
Since then the car has showed 199 BHP flywheel (152 at the wheels), but at a different albeit seemingly reliable road. this was after a bit of judicious rebuilding, polishing and porting, etc
Marcus
Podie doddze said:
Anything a bit closer that anyone knows of.........
If I get the downpipes (anyone know where from?) is it difficult to fit them? ie could the local exhaust guys do it or is specialist equipment needed?
Downpipes really easy. Specialist tools required, large rubber mallet.
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