As expected, the only drawback from installing the larger intercooler is the slightly longer time it takes to fill the core, which contributes to turbo lag. However, it was only less than 100 rpm slower to react until the second turbo came online.

One thing we realized with these last dyno runs was that Project Supra is maxed out at about 370 whp on California's crappy 91-octane pump gas. In order to see what our end results would be with the stock turbos we added a few gallons of Sunoco 112 octane racegas to the mix. With what is now approximately a 94-95-octane gas mix, the EMS-controlled wastegate was set to stay closed a little longer. To our surprise, the turbos wouldn't boost manifold pressure past 17 psi. Karamikian adjusted the timing a bit and was able to coax out a maximum of 395 whp and 376 lb-ft of torque.

Our numbers may sound a bit on the low side when considering other Supra owners have seen over 400 whp at similar boost levels with the stock twins. However, a quick check of our compression told us something was wrong in the #4 cylinder, which was down nearly 40 psi. Couple that with a nearly 100k mile engine/turbos and you can see why the power drop is possible.

So where does this power drop lead us? Whether it's a bad valve or a bad piston ring in the #4 cylinder, it won't matter for long. The entire engine will be undergoing surgery and receiving much stronger internal organs at Speed Force Racing. By the time you read this we'll hopefully have the tuning done and the car dyno tested with its new lungs-an SP71-GTQ turbo kit from Sound Performance. Yes, it's going to get a lot more fun now. Stay tuned.

Author's note: At this year's Hotchkis Media Challenge our Supra DNF'd during its second run on the dragstrip when trying to slip the clutch during a 6000-rpm launch. The disc seized to the flywheel and the car wouldn't run once put into gear. We replaced the unit with another Centerforce unit, which we will be testing the torque limits of with our new setup, as well as a Fidanza lightweight flywheel. Special thanks to RJ and Matt Hunt of UPFD for taking the car in on a Friday evening and having it ready the following business day.

SOURCE
Fidanza
4199 Main Street Bldg. A
Perry
OH  44081
440-259-5656
www.fidanza.com
evosport
15608 Graham Street
Huntington Beach
CA  92649
888-520-9971
www.evosport.com
Turbonetics
2255 Agate Ct.
Simi Valley
CA  93065
805-581-0333
http://www.turboneticsinc.com
Under Pressure Fabrication and Distribution
14102 Willow Lane
Westminster
CA  92683
714-890-5153
www.upfd.com