Chris White

Made a special trip to the dyno on Sunday - the car owner wanted to see the final testing and Sunday was his only free day. He flew up from NYC and I think he found the trip worth it!

Here is a pic of the car on the dyno (paint was so nice we wrapped the car to make sure it didn't get any scratches) and dyno charts for 12psi and 20psi.

I think I am most impressed by the 12 psi run.

Details - 3.1 liter MID Sleeve, Wossner pistons, Electromotive TecGT engine management (full sequential), SFR intake and headers, Tial/GTX35 turbo, Vitesse cam and a bunch of other goodies.

Dyno chats are wheel hp/tq.

Chris White

I got an email this morning from the owner - seems a Viper challenged him on his drive back to NYC....bye bye Viper!

speedfreak81

Awesome numbers Chris! Just curious why the owner went 8v instead of a 16v setup?

reno808

Nice

Fluidplay

torq 370 @ 12# and hitting it at 4k ...really nice!!

Van

I'm curious, because the torque peaks and then tapers off for the 12psi, but it stays nice and flat for the 20psi run, does that mean that there's some internal flow limitation - like exhaust headers or intake manifold or head, that's restricting the flow of air? But that limitation is overcome by the higher boost pressure?

reno808

My only guess is the Maps would be different that is effecting TQ....

User 52121

Wow ~370hp at 12psi? That IS nice. Sounds like my kinda build

Duke

Nice results. Looks like the rpm limit could be set a bit higher? What fuel?

The 12 psi run peaks at 14 psi during the torque peak.

Chris White

The is a 'hump' in the boost curve at 12 psi - it runs up to almost 14 and then back down to 12, that's why the torque curve looks like its dropping off. I didn't bother massaging the 12 psi boost setting (its running a turbosmart eboost that has 6 sequential boost settings) because it snot used very often.

Chris White

Pump gas - 93 octane. Its a street car with lots of midrange torque, no need to rev it up. I am sure it could run to 7k if needed, but not worth the wear and tear. To really make use of the upper rpm I would have to change the cam timing a bit - but I think its better to keep the low end.

If you look at the 20 psi boost curve you will see that it was already making 3psi of boost at 3krpm and 7psi by 3.5k.

and good job see the reason for the 'extra' torque on the 12psi run, obviously you know how to read a dyno graph!

Chris White

in reality the 8v is a better street engine, the 16v can't match its low / mid range torque. If you can make 370 rwhp at 12 psi why add the complexity of a 16v if you don't need it?

Of course I like 16v set ups but its a different tool for a different job.....and it costs a lot more! When you do the math with a fixed price build it usually makes more sense to build an 8v with better parts / more head work than you can get with a 16v build for the same cost.

333pg333

Looks like a really good street motor with the occasional track day in mind.

In your summation of the differences between the 8v and 16v, does that imply that this head is highly worked?

Chris White

Yep, reshaped LARGE ports with bigger valves. The ports are now large enough that velocity at idle is pretty damn slow!

fejjj

Great work Chris!

I am looking forward to having you work on my engine soon.