Mark P - did you do any pulls on Saturday?
11-10-2003, 01:17 PM
#13
AudiWorld Expert
Here's my 2nd & 3rd runs, with ESP off...
<img src="http://ctny.audiworld.com/mark/s4/dyno/dyno_hptq_031108.gif">
And here was the 1st run (below). You can see how ESP cut power and thus I didn't reach my torque peak until after 4000 RPMs...
<img src="http://www.ktrperformance.com/gallery/Events/AudiGTG/graph_mark_p.gif">
And here was the 1st run (below). You can see how ESP cut power and thus I didn't reach my torque peak until after 4000 RPMs...
<img src="http://www.ktrperformance.com/gallery/Events/AudiGTG/graph_mark_p.gif">
11-10-2003, 01:46 PM
#16
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Given his 109mph trap, that's almost dead on
Run the numbers yourself. ~3600lbs, 109mph -> 371 crank HP on that calc. With the ~30% loss from crank to wheel on this dyno, you get 259.7wHP. Who woulda thunk it?
This calc is apparently adjusting for driveline loss, unless my stock 1.8T actually made 160wHP?
<a href="http://www.corral.net/tech/horsepower.html">Click</a>
How about some other evidence to corroborate the dyno's claim? Well, let's see. Take a look on s4biturbo.com at the time slips and mods. Stage 2+ cars are getting similar traps to Mark's car. Several cars have trapped at 108mph. According to <a href="http://www.clubdsm.com/tools/calchp.htm">this calc</a>, that's good for 354cHP. The same calc gives Mark's car 364cHP. Going along with the established 30% loss from crank to wheel on this dyno, that would place the Stage 2+ car at 247wHP.
On Saturday, a Stage 2 car made 235wHP. That's going to be around 335cHP. Back to the calculators and timeslip database, and what do we see? Stage 2 cars making about 230-240wHP.
Things are looking pretty darn consistent to me. What am I missing here?
This calc is apparently adjusting for driveline loss, unless my stock 1.8T actually made 160wHP?
<a href="http://www.corral.net/tech/horsepower.html">Click</a>
How about some other evidence to corroborate the dyno's claim? Well, let's see. Take a look on s4biturbo.com at the time slips and mods. Stage 2+ cars are getting similar traps to Mark's car. Several cars have trapped at 108mph. According to <a href="http://www.clubdsm.com/tools/calchp.htm">this calc</a>, that's good for 354cHP. The same calc gives Mark's car 364cHP. Going along with the established 30% loss from crank to wheel on this dyno, that would place the Stage 2+ car at 247wHP.
On Saturday, a Stage 2 car made 235wHP. That's going to be around 335cHP. Back to the calculators and timeslip database, and what do we see? Stage 2 cars making about 230-240wHP.
Things are looking pretty darn consistent to me. What am I missing here?
11-10-2003, 02:05 PM
#18
AudiWorld Expert
just don't forget to specify pump/race on each of those...
my 109 is on Pump gas
the 2+ slips that ran 108 are on Race gas
the chipped 2.7T's that dyno'd were on Pump gas
the 2+ slips that ran 108 are on Race gas
the chipped 2.7T's that dyno'd were on Pump gas
