Went to a great shop in Maryland yesterday called Extreme Motorsports to get some rough spots (mostly on the vaccum side) in my AEM maps ironed out. Unfortunately, by the time we got around to logging the runs with boost in excess of 10psi... the engine was fairly heatsoaked. The IAT's were running about 50-60 degrees higher than what I typically see on the street. I am still using the stock IAT sensor that is located post-throttle body. So it doesn't measure the true temp of the intake air charge and is heavily influenced by the heat of the engine itself. The down side is that the sensor is very succeptable to heat soak, but it does add a bit of safety to test the engine when things aren't perfect. Ironically, the highest IAT's I typically see while on the street is when sitting still in traffic. Once the car get's moving and the throttle body is open to let in larger amounts of cool air, the IAT's come back down. Next time I will do a better job of keeping the conditions similar to what I see on the street
I could have run ice in the aftercooler resovoir and blew air on the intake with high speed fans to cool things down a bit, but I didn't in the interest of getting a safe tune even for non-optimal conditions. As a result, the AEM was pulling timing throughout the boost range to the tune of about 3 degrees. The best part about this is that the AEM is doing what it's supposed to do when the engine starts getting hot That coupled with the high IAT's from heat soak, maximum power was not what these pulls were intended to show. With the pulled timing & high IAT's, and running about 12-12.5 psi of boost, I was getting between 500-510rwhp SAE corrected.... and between 390-405 SAE corrected torque.
The dyno sheet that I will post later tonight will be a 501rwhp/390tq pull. Later on that(last) night I went out to do some real world testing of the tune and found it to run much stronger on the street than on the dyno. With the same boost controller setting... the car would generate about 2 more psi of boost and keep the timing table intact. My boost controller (Blitz SBC-ID) is currently set up to run in Maunual mode, where you set the boost level as funtion of maximum boost as opposed to dialing in the exact psi you want. So depending on the conditions, I will see variance in maximum boost by about 1-2psi.
I would estimate that with my typical street IAT's that this channel on my boost controller is producing 40-50 more rwhp than it did on the dyno when heat soaked. I have a previous dyno sheet from several months ago to back that up where it made 545 rwhp and 445 lbs of torque(Dynapak SAE #'s) on this same setting. One of these days after NSXPO I will go back to Extreme Motorsports because there is still one area of my map that needs a little work. I will try to get another run in when the engine is not heat soaked and will be sure to share the results with everyone.
Because the dyno output is in a special format that I cannot save as an image, later tonight I will post a photograph of the sheet
I could have run ice in the aftercooler resovoir and blew air on the intake with high speed fans to cool things down a bit, but I didn't in the interest of getting a safe tune even for non-optimal conditions. As a result, the AEM was pulling timing throughout the boost range to the tune of about 3 degrees. The best part about this is that the AEM is doing what it's supposed to do when the engine starts getting hot
That coupled with the high IAT's from heat soak, maximum power was not what these pulls were intended to show. With the pulled timing & high IAT's, and running about 12-12.5 psi of boost, I was getting between 500-510rwhp SAE corrected.... and between 390-405 SAE corrected torque.The dyno sheet that I will post later tonight will be a 501rwhp/390tq pull. Later on that(last) night I went out to do some real world testing of the tune and found it to run much stronger on the street than on the dyno. With the same boost controller setting... the car would generate about 2 more psi of boost and keep the timing table intact. My boost controller (Blitz SBC-ID) is currently set up to run in Maunual mode, where you set the boost level as funtion of maximum boost as opposed to dialing in the exact psi you want. So depending on the conditions, I will see variance in maximum boost by about 1-2psi.
I would estimate that with my typical street IAT's that this channel on my boost controller is producing 40-50 more rwhp than it did on the dyno when heat soaked. I have a previous dyno sheet from several months ago to back that up where it made 545 rwhp and 445 lbs of torque(Dynapak SAE #'s) on this same setting. One of these days after NSXPO I will go back to Extreme Motorsports because there is still one area of my map that needs a little work. I will try to get another run in when the engine is not heat soaked and will be sure to share the results with everyone.
Because the dyno output is in a special format that I cannot save as an image, later tonight I will post a photograph of the sheet
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