New FP White turbo
Jul 3, 2008, 12:33 PM
#301
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Here's some more stripchart goodness. Car is exactly the same as the white dyno setup, same boost control setup and all. Car is a 9 RS with weight ADDED and a full tank of gas.
You're seeing some new things here. The top time axis scale is an offset from just before the VSS picks up a signal. The cursor is at 59.9 MPH. Now I must admit the VSS (drive speed) calibration is off a slight amount, tires with a scootch different rollout are on the car.
Also included is the wastegate linear position (WG linear position) in raw volts.
Notice the same 'hit the wall' phenomenon exists in 4th gear, and its a little easier to see, but during 1st thru 3rd it runs clean till the tail end of 3rd.
The airflow was scaled to closely match the turbo RPM, you can see better how overspeeding the turbo causes the power to drop off at high RPM. This is
the compromise you get with a small turbine wheel, it spools and recovers quick, but you lose up top.
The boost pressure jumps up a little bit after shifts due to the extra load put on the engine during a WOT shift.
The driver could do a better job, he's a little slow on the shifts. Nothing a little practice won't cure.
You're seeing some new things here. The top time axis scale is an offset from just before the VSS picks up a signal. The cursor is at 59.9 MPH. Now I must admit the VSS (drive speed) calibration is off a slight amount, tires with a scootch different rollout are on the car.
Also included is the wastegate linear position (WG linear position) in raw volts.
Notice the same 'hit the wall' phenomenon exists in 4th gear, and its a little easier to see, but during 1st thru 3rd it runs clean till the tail end of 3rd.
The airflow was scaled to closely match the turbo RPM, you can see better how overspeeding the turbo causes the power to drop off at high RPM. This is
the compromise you get with a small turbine wheel, it spools and recovers quick, but you lose up top.
The boost pressure jumps up a little bit after shifts due to the extra load put on the engine during a WOT shift.
The driver could do a better job, he's a little slow on the shifts. Nothing a little practice won't cure.
Last edited by GrocMax; Jul 3, 2008 at 12:43 PM.
Jul 3, 2008, 03:02 PM
#309
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It takes about a week to do the overhaul and update to the FPWhite Model.
I'm surprised there isnt more chatter about the data provided so far. Are the logs not very easy to read or understand?
BOOST ON!
Robert Young
I'm surprised there isnt more chatter about the data provided so far. Are the logs not very easy to read or understand?
BOOST ON!
Robert Young
Jul 3, 2008, 03:45 PM
#312
I KNOW!!!
As far as I've ever seen, your company is the only company to be so open with data. AWESOME
However, we have nothing to compare it against...I can see some interesting relationships between shaft speed, wastegate position, and exhaust backpressure. Charge temps pre and post IC would be interesting to see.
What were the details of the pass? Looks like a high 12 at 115-120mph on ~22psi?
Jul 3, 2008, 05:10 PM
#315
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