Back in 2010, we received this particular Cayman S for a turbo kit installation so that the cars owner could have more fun at the track and also when going out to drive the car. That was accomplished, and the car was a rocket! Three years later, after several track days and a lot of fun miles, the owner of this great Cayman wanted more power and something that would stand up to constant abuse on the track. After sitting down and thinking about the options, the 3.7L engine build with methanol injection was the way to go in order to take this project to the next level.

To do this, we had to tear down the engine to machine the block to transform it from a 3.4L to 3.7L. After machining the sleeves, the block was ready for TPC Racing custom forged pistons and connecting rods. By doing this, we were able to drop the compression from 11:1 to 10:1. This improves the torque in a huge way, making for huge torque while the boost comes in very smooth. With the methanol injection being set on a load demand, it will make the car pull even stronger but still smooth as it works through the revs.

The owners initial goal was to reach around 500 wheel horsepower. The first run we made without modifying the boost, we were able to put down just shy of 500WHP, so we knew that 500 would not be a hard reach. When we got into the next set of dyno runs, we went to around 6psi and went to add a degree of timing, and right away at around 6000RPM, the clutch started to slip. At this point we knew we were north of 500WHP! We took the car off of the dyno, put it in the air, changed the clutch and back on the dyno the car went. We did some adjusting with the methanol tuning and did a final dyno pull to make 537WHP!! That calculates to about 630HP at the crank! When driving this car, it is a true experience. The power comes on so smooth it's like it came from the factory that way. It is a pleasure to drive and just like with any TPC Racing Turbo Kit, the car drives completely normal. Once you start applying power and the boost starts to come in with the methanol, you open up a new world. Pull up to a 997 Twin Turbo or a Corvette Z06 and just pull away from them and leave the owners scratching their heads.

This is the most power we have gotten out of a 3.7L Cayman Turbo build. The lowered compression and custom internals of the engine plus adding the methanol allow us to run higher boost for a longer period of time. This 3.7L Cayman Turbo is the most impressive Cayman to date, and the owner of the car is now out and enjoying every moment with it!

Below is the dyno chart, and soon there will be a dyno video to follow this post.

 

So,do you believe that the difference between 500WHP and 537WHP has after the modification of the methanol injection or of the clutch?
Did you measure your WHP with and without methanol injection?

 

We have seen the other 3.7L turbocharged Cayman's that we have built put down about 510WHP. With the methanol modification on this particular car, it is putting down 538WHP.

 

Thanks