Twin Turbo 928 fixed and back out there terrorizing the streets!
#1921
Developer
This chart was just made by us today. Engine dyno of our 6.54L motor. Shows 900 HP at the crank (OK, 897.7 ) She was running real smooth, too.
I will post the video just as soon as I can.
I will post the video just as soon as I can.
#1926
Nordschleife Master
Thread Starter
Another thing is that we're asking LH, EZ-K, and ST2 to do things that nobody else has ever asked them to do. In the process, we're finding all sorts of engine control issues at 500 crank hp and 600 crank hp levels that nobody else has uncovered. For example, we're hitting the Super MAF voltage of 5.11V at 3500 rpm, hands up if someone else has done that? And then a follow up question what happens when you do that? ;-) As a reference, 5.11V from SuperMAF corresponds to approximately 1800 kg/h and 600 crank hp. C'mon, the answer to this question should be known to everyone who claims to be making 600hp or more at the crank with stock computers!
Last edited by ptuomov; 05-21-2018 at 12:28 PM.
#1928
Nordschleife Master
Thread Starter
About 16.7 psi at peak power, give or take, for that particular run. That’s measured from the intake manifold, not compressor outlet.
Last edited by ptuomov; 05-21-2018 at 11:25 AM.
#1929
Nordschleife Master
Thread Starter
More details of what's going on at the 720 rwhp level, these are 6000-6250rpm range averages from another run today:
Pressures:
Barometer 14.80
Turbocharger Suction Pressure (ABS) 13.85
Intercooler Pressure Delta (DIFF)1.30
Intake Manifold Pressure (ABS) 30.69
Downpipe Pressure (ABS) 15.97
Tempratures:
Turbo Comp. Discharge Temp (3) 321.50
Pre-Intercooler Temp. (4) 292.53
Post-Intercooler Temp. (6) 121.84
Intake Manifold Temp. (7) 117.91
Pressures:
Barometer 14.80
Turbocharger Suction Pressure (ABS) 13.85
Intercooler Pressure Delta (DIFF)1.30
Intake Manifold Pressure (ABS) 30.69
Downpipe Pressure (ABS) 15.97
Tempratures:
Turbo Comp. Discharge Temp (3) 321.50
Pre-Intercooler Temp. (4) 292.53
Post-Intercooler Temp. (6) 121.84
Intake Manifold Temp. (7) 117.91
#1930
Unless I am misreading or missed other info -
IATs post intercooler will pose problems with detonation if you look at similar platforms. On a road course those would rise possible (balancing more air flow, but also more heat) to 130. You would need meth there to cool post IC pre port.
You will need to increase the fuel's detonation resistance or reduce IATs.
IATs post intercooler will pose problems with detonation if you look at similar platforms. On a road course those would rise possible (balancing more air flow, but also more heat) to 130. You would need meth there to cool post IC pre port.
You will need to increase the fuel's detonation resistance or reduce IATs.
#1932
Nordschleife Master
Thread Starter
99/100 people tuning these cars only tuned the highest load cells at high rpms. In contrast, John tunes basically every cell to the extent that it can be tuned.
#1933
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What is the stock IAT?
#1934
Nordschleife Master
Thread Starter
Stock engine intake manifold air temperature is very close to ambient temperature at WOT. Seems like the small effects of heat in the engine bay, friction in the flow causing turbulence, and small pressure drop because of flow resistance don't make much of a difference.
This test was done on a hot and sunny day, with ambient temperature over 90 inside the hangar. There's no AC in there, that would be very expensive facility to cool.
The intercoolers are working incredibly well, minimal pressure drop at 1.3 PSI and 170F coming off the charge air temperature. John got those right, only took six months to design! ;-)
This test was done on a hot and sunny day, with ambient temperature over 90 inside the hangar. There's no AC in there, that would be very expensive facility to cool.
The intercoolers are working incredibly well, minimal pressure drop at 1.3 PSI and 170F coming off the charge air temperature. John got those right, only took six months to design! ;-)
#1935
Drifting
ptuomov,
I thought the car was meant for road racing and you would do final tune at each course at elevation and temp to optimized tune for each course......sorry I thought this was racer only.....!!!!!
I thought the car was meant for road racing and you would do final tune at each course at elevation and temp to optimized tune for each course......sorry I thought this was racer only.....!!!!!