Stay tuned

[Jason@SportsCar]

The results are in, the Jun cams are an improvement over the custom grind we had done for the 2010 season, but they are not magic.

With the combination of head work and cams we picked up 12hp when compared to the stock engine we ran in 2011. However, just like with the custom grind cams we lost Tq below 5000rpm when compared to the stock engine - fortunately in this case we only lost 3ft-lbs, where the 2010 cams lost around 18ft-lbs.

While I was not jumping for joy at the final numbers, I was happy to see the top end power match our 2010 numbers, while regaining most of our lost Tq. Additionally, the power band with the Jun cams is much broader than the custom grind was, we have nearly 1000 more usable RPMs than we did before. From 5500rpm on we have more HP and Tq than either of the previous setups offered, and the power delivery is smooth.

If you are thinking about the Jun 9.5 cams keep in mind these are not a direct bolt-in. Your head will need relief cuts to clear the lobes, and without engine management you will not see the full gains.

Overall I give them a thumbs up, but expect to spend about $2k between the cams and head work.

[racerb]

Originally Posted by Jason@SportsCar

The results are in, the Jun cams are an improvement over the custom grind we had done for the 2010 season, but they are not magic.

With the combination of head work and cams we picked up 12hp when compared to the stock engine we ran in 2011. However, just like with the custom grind cams we lost Tq below 5000rpm when compared to the stock engine - fortunately in this case we only lost 3ft-lbs, where the 2010 cams lost around 18ft-lbs.

While I was not jumping for joy at the final numbers, I was happy to see the top end power match our 2010 numbers, while regaining most of our lost Tq. Additionally, the power band with the Jun cams is much broader than the custom grind was, we have nearly 1000 more usable RPMs than we did before. From 5500rpm on we have more HP and Tq than either of the previous setups offered, and the power delivery is smooth.

If you are thinking about the Jun 9.5 cams keep in mind these are not a direct bolt-in. Your head will need relief cuts to clear the lobes, and without engine management you will not see the full gains.

Overall I give them a thumbs up, but expect to spend about $2k between the cams and head work.

As a long time racer of low horsepower front drive cars, any gains with restrictive rules are a real plus. Learning how to get the most out of the loose nut behind the wheel, can actually make the biggest difference. Just look back in history at what those early racers did with the first Mini Coopers, cars that might have had 40 hp and tiny, skinny as hell tires. When you get to the point where your getting the most out of you the driver, then horsepower numbers aren't as big a factor in all out speed!!

racerb