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The Road to World of Speed: A Multimedia Recount Part 1

  • ChuckJohnson

,

This is how Nerds party it up in the casino; Nick Hunter and Sean Rossi viewing race car data. Because Racecar. This is how Nerds party it up in the casino; Nick Hunter and Sean Rossi viewing race car data. Because Racecar.

Later that night, we reviewed the data logs from the AEM Infinity EMS over a few beers in the Rainbow Casino's lounge area.  Some of the locals found it amusing that a group of guys were huddled together in a bar staring at a laptop, ignoring the live band and all the dancing ladies.  Eventually, one of the locals came over and asked us if we were watching porno.  After a brief exchange and a few laughs, we found out that he was Mike Crawford, Mayor of Wendover.  We got a kick out of that…  Later in the week, the Mayor's huge pet parrot would attempt to assault Sean during a bathroom break.  That’s a story for another day though.

 

First Run DataThis plot of throttle position versus wheel speed clearly depicts the careful application of power required to make a pass at Bonneville in a high powered turbo car without spinning.  Anyone who thinks that racing at Bonneville is just a matter of keeping your foot planted on the gas pedal is a damn fool. 

In reviewing the data logs, we plotted throttle position, boost pressure, and wheel speed along with gear and RPM.  The data logs from the AEM Infinity EMS confirmed that I was only able to use a fraction of the power on hand and essentially, I was pedalling the car up to speed at partial throttle using only a third of the available boost pressure.  Indeed, I was never able to drive the car flat out as it would snap oversteer the second I got overly ambitious with the throttle. 

Although 5233 Motorsports had already programmed in gear dependent boost control ahead of time, we decided that some changes were still needed to make the car more manageable to drive.  The ease of implementing powerful changes is where the power of the Infinity EMS really begins to shine. 

To make Project 240SX LSR a bit more manageable to drive, Nick pulled boost from 2nd, 3rd and 4th and 5th gear.  The reduction of boost would still leave us more than enough power to cross the 200 MPH barrier.

 

In addition, we decided to soften up the rev limiter as the lack of traction would cause the engine RPMs to shoot up quickly and too abrupt of a rev limiter and cut in power could cause the car to become unstable.  Originally, 5523 Motorsports had set up just a basic fuel cut at 9,000 RPM.  To soften the rev limiter, a spark cut was introduced at 8,800 RPM along with an ignition retard of 10 degrees beginning at 8,600 RPM.

 

Project 240sx LSR in impound at BonnevilleWith the changes to our tune completed, we called it a day knowing that we had to be back on the salt and at impound before sunrise the next morning.
Nick Hunter of 5523 Motorsports looks over the data from the AEM Infinity EMSThe next morning, Sean re-installed the repaired wheels while Nick uploaded the new tune.  It’s pretty impressive to see how easy it is to make changes with the AEM Infinity EMS. 

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