Looney Tuning
05-11-2009, 09:26 PM
This Evo X GSR belongs to forum member 08evox. EvoPaul recommended me as a tuner. Thanks a lot EvoPaul O0. I love word of mouth advertising.
The car had the following mods:
Injen CAI with UICP (I really like the Injen set-up, they really isolated the filter with a heatshield)
Ultimate Racing TBE
3" long downpipe
3" test pipe
3" Catback Exhaust.
The car was one of the most free flowing Xs that I have tuned so far. The turbo airflow hit 39 lb/min. This is the most that any Evo X has hit so far. If as rumored the Evo X turbo is good for ~42 lb/min, then 39 lb/min is pretty darn close. Take a look at the before and after airflow numbers. As always, these 3D charts are 3-4 back-to-back logs.
http://www.sr20deracing.com/EVO/Jeffw/airflow_b4_after.gif
The stock airflow maxed out at 36.1 lb/min and the tuned airflow maxed out at 39.1 lbs/min, that is 3 lb/min increase over stock by redline. In the 5500 rpm midrange the increase was a stunning 4.7 lb/min.
The stock boost on this car was lower at peak than other Evo Xs that I have tuned. Here is the way the before and after 3D boost charts looked:
http://www.sr20deracing.com/EVO/Jeffw/boost_b4_after.gif
Not only was the stock boost low, it also spooled up at a leisurely 4000 rpm. The tuned boost was achieved at ~3000 rpm where the car hit 24 psi on one of the runs. That is a full 1000 rpm sooner than on the stock tune. The boost held at 24-23 psi from 3000 rpm to 5500 rpm. In the same rpm range, the stock boost would taper from 20.34 psi to 17.27 psi, a 3 psi loss. By redline the tuned boost held to a maximum of 19.40 psi by redline. All that was done on the stock pill. God, I love the dual solenoid assembly of the Evo X. It is miles ahead of the single solenoid on the Evo 8/9. On the Evo 8/9, you must run a smaller boost pill to get these boost numbers.
The AFR was not as rich as other Evo Xs that I have tuned even though this car did not have the factory re-flash. I suspect that the oversize Injen intake pipe had something to do with it. Here are the before and after AFR charts.
http://www.sr20deracing.com/EVO/Jeffw/afr_b4_after.gif
The stock AFR dipped into the 10.xx:1 AFR at 4000 rpm and stayed that way all the way to 6500 rpm. From 6500 rpm to redline the AFR spiked to 11.34 average AFR. The tuned AFR was 1 full point leaner (11.73:1) at peak torque and then tapered nicely to 11.2:1 AFR by redline.
Here is an overlay of a stock boost/afr chart and a tuned boost/afr chart.
http://www.sr20deracing.com/EVO/Jeffw/overlay.gif
Notice the flatness of the tuned boost curve from 3000 rpm all the way to 5000 rpm. Later on the boost slowly tapers to redline. The AFR is almost the same as stock at ~3500 rpm and redline, but in the midrange the AFR is much leaner than stock.
Finally, here are the before and after power curves. There are gains everywhere in the area under the curve.
http://www.sr20deracing.com/EVO/Jeffw/dyno_b4_after.gif
The peak gains were 58 hp and 34 ft-lb of torque. But the peak gains are nowhere as impressive as the sustained gains throughout the power curve. For example, from 3000 rpm to 5000 rpm there is an average of 26 hp gain. The most gains in the rpm range were:
From 6500 to 7000 rpm + 57 hp
From 6000 to 6500 rpm + 46 ft-lb torque
The rest of the power gains are noted on the chart.
The car had the following mods:
Injen CAI with UICP (I really like the Injen set-up, they really isolated the filter with a heatshield)
Ultimate Racing TBE
3" long downpipe
3" test pipe
3" Catback Exhaust.
The car was one of the most free flowing Xs that I have tuned so far. The turbo airflow hit 39 lb/min. This is the most that any Evo X has hit so far. If as rumored the Evo X turbo is good for ~42 lb/min, then 39 lb/min is pretty darn close. Take a look at the before and after airflow numbers. As always, these 3D charts are 3-4 back-to-back logs.
http://www.sr20deracing.com/EVO/Jeffw/airflow_b4_after.gif
The stock airflow maxed out at 36.1 lb/min and the tuned airflow maxed out at 39.1 lbs/min, that is 3 lb/min increase over stock by redline. In the 5500 rpm midrange the increase was a stunning 4.7 lb/min.
The stock boost on this car was lower at peak than other Evo Xs that I have tuned. Here is the way the before and after 3D boost charts looked:
http://www.sr20deracing.com/EVO/Jeffw/boost_b4_after.gif
Not only was the stock boost low, it also spooled up at a leisurely 4000 rpm. The tuned boost was achieved at ~3000 rpm where the car hit 24 psi on one of the runs. That is a full 1000 rpm sooner than on the stock tune. The boost held at 24-23 psi from 3000 rpm to 5500 rpm. In the same rpm range, the stock boost would taper from 20.34 psi to 17.27 psi, a 3 psi loss. By redline the tuned boost held to a maximum of 19.40 psi by redline. All that was done on the stock pill. God, I love the dual solenoid assembly of the Evo X. It is miles ahead of the single solenoid on the Evo 8/9. On the Evo 8/9, you must run a smaller boost pill to get these boost numbers.
The AFR was not as rich as other Evo Xs that I have tuned even though this car did not have the factory re-flash. I suspect that the oversize Injen intake pipe had something to do with it. Here are the before and after AFR charts.
http://www.sr20deracing.com/EVO/Jeffw/afr_b4_after.gif
The stock AFR dipped into the 10.xx:1 AFR at 4000 rpm and stayed that way all the way to 6500 rpm. From 6500 rpm to redline the AFR spiked to 11.34 average AFR. The tuned AFR was 1 full point leaner (11.73:1) at peak torque and then tapered nicely to 11.2:1 AFR by redline.
Here is an overlay of a stock boost/afr chart and a tuned boost/afr chart.
http://www.sr20deracing.com/EVO/Jeffw/overlay.gif
Notice the flatness of the tuned boost curve from 3000 rpm all the way to 5000 rpm. Later on the boost slowly tapers to redline. The AFR is almost the same as stock at ~3500 rpm and redline, but in the midrange the AFR is much leaner than stock.
Finally, here are the before and after power curves. There are gains everywhere in the area under the curve.
http://www.sr20deracing.com/EVO/Jeffw/dyno_b4_after.gif
The peak gains were 58 hp and 34 ft-lb of torque. But the peak gains are nowhere as impressive as the sustained gains throughout the power curve. For example, from 3000 rpm to 5000 rpm there is an average of 26 hp gain. The most gains in the rpm range were:
From 6500 to 7000 rpm + 57 hp
From 6000 to 6500 rpm + 46 ft-lb torque
The rest of the power gains are noted on the chart.