Looney Tuning
02-19-2009, 01:25 AM
This is the first Looney Logged Evo X. The car belongs to Gear Grinder. It had the following mods:
TBE
AEM Intake
I finally have the software needed to log/tune the car.
I am using PCMScan to log the car. It is a generic OBDII logger that happens to work with the Tactrix cable and the Evo X. Others on Evom have used it and they have reported good results. It can log the following necessary tuning parameters:
Load
Throttle Position
Ignition Timing
Boost
AFR from an external meter (I use the LM-1)
The logger is not as fast as Evoscan but it is fast enough. On Gear Grinder’s car it was able to log 4 data points every 1000 rpm. Not great, but good enough.
The only variable that it does not log is Knock Sum, but a proper reading of the timing curve will allow a tuner to detect knock. Take a look at the timing chart below from GG’s car. This is a 4th gear log.
http://www.sr20deracing.com/EVO/Danny/timing_curve.gif
The black square on the log shows ho the timing curve is getting pulled. At 4724 rpm the timing is 12* and goes up to 14* at 4781 rpm only to get pulled back to 12* at 4816 rpm. The red square tells a similar story. Timing @ 6523 rpm is 23*, gets pulled to 22* @ 6645 rpm, goes up to 23* @ 6723 rpm, and gets pulled again to 22* by 6875 rpm.
Basically, the car is experiencing some light knock. Had there been a knock sum log, it would show anywhere between 1-3 counts of knock.
The other logged parameters should the following. The logs are two 3rd and 4th gear logs combined into the 3D chart below:
http://www.sr20deracing.com/EVO/Danny/boost.gif
The boost peaks at 22 psi and then tapers to an average 14.58 psi by redline. Max boost by redline is 15.84 psi.
The disappointing log was the AFR log. I have read how the AEM intake leans out the AFR and I was expecting about 11:1 AFR, but it was not to be.
http://www.sr20deracing.com/EVO/Danny/afr.gif
The AFR was into the 10:1 at the moment of tip-in and stayed there all the way to redline. At 7000 rpm it was a miserable 10.07:1. If this “lean” AFR was achieved with the AEM intake, one shudders at the AFR numbers generated with the stock intake. The reason the AEM leans out the AFR is the large size intake tube that it uses. This lowers the load numbers that the car hits in the fuel map and the lower load has leaner fuel cells. It is that simple.
The last chart is the timing that the car hit in the two runs.
http://www.sr20deracing.com/EVO/Danny/timing.gif
The car does run a lot of timing. The timing is even higher at the top end than that of an Evo 8. IIRC, these cars used to have 21-22* of advanced timing at redline. Obviously, once I lean out the car and add more boost, the timing must be reduced to eliminate the likelihood of knock. That is the plan anyway.
GG and I did these logs late at night in very cold weather conditions. I want to log the car again under more normal weather conditions. Then I will begin the tuning process. I am going to be very slow and deliberate with tuning this car. Then I will tune a few others. After tuning a few Evo Xs, I will then start tuning for the general public. I will charge similar/same prices to the tuning that I do on Evo 8/9.
TBE
AEM Intake
I finally have the software needed to log/tune the car.
I am using PCMScan to log the car. It is a generic OBDII logger that happens to work with the Tactrix cable and the Evo X. Others on Evom have used it and they have reported good results. It can log the following necessary tuning parameters:
Load
Throttle Position
Ignition Timing
Boost
AFR from an external meter (I use the LM-1)
The logger is not as fast as Evoscan but it is fast enough. On Gear Grinder’s car it was able to log 4 data points every 1000 rpm. Not great, but good enough.
The only variable that it does not log is Knock Sum, but a proper reading of the timing curve will allow a tuner to detect knock. Take a look at the timing chart below from GG’s car. This is a 4th gear log.
http://www.sr20deracing.com/EVO/Danny/timing_curve.gif
The black square on the log shows ho the timing curve is getting pulled. At 4724 rpm the timing is 12* and goes up to 14* at 4781 rpm only to get pulled back to 12* at 4816 rpm. The red square tells a similar story. Timing @ 6523 rpm is 23*, gets pulled to 22* @ 6645 rpm, goes up to 23* @ 6723 rpm, and gets pulled again to 22* by 6875 rpm.
Basically, the car is experiencing some light knock. Had there been a knock sum log, it would show anywhere between 1-3 counts of knock.
The other logged parameters should the following. The logs are two 3rd and 4th gear logs combined into the 3D chart below:
http://www.sr20deracing.com/EVO/Danny/boost.gif
The boost peaks at 22 psi and then tapers to an average 14.58 psi by redline. Max boost by redline is 15.84 psi.
The disappointing log was the AFR log. I have read how the AEM intake leans out the AFR and I was expecting about 11:1 AFR, but it was not to be.
http://www.sr20deracing.com/EVO/Danny/afr.gif
The AFR was into the 10:1 at the moment of tip-in and stayed there all the way to redline. At 7000 rpm it was a miserable 10.07:1. If this “lean” AFR was achieved with the AEM intake, one shudders at the AFR numbers generated with the stock intake. The reason the AEM leans out the AFR is the large size intake tube that it uses. This lowers the load numbers that the car hits in the fuel map and the lower load has leaner fuel cells. It is that simple.
The last chart is the timing that the car hit in the two runs.
http://www.sr20deracing.com/EVO/Danny/timing.gif
The car does run a lot of timing. The timing is even higher at the top end than that of an Evo 8. IIRC, these cars used to have 21-22* of advanced timing at redline. Obviously, once I lean out the car and add more boost, the timing must be reduced to eliminate the likelihood of knock. That is the plan anyway.
GG and I did these logs late at night in very cold weather conditions. I want to log the car again under more normal weather conditions. Then I will begin the tuning process. I am going to be very slow and deliberate with tuning this car. Then I will tune a few others. After tuning a few Evo Xs, I will then start tuning for the general public. I will charge similar/same prices to the tuning that I do on Evo 8/9.