I want that kit

 

Nice numbers guys!! I noticed that the pistons are 9.3:1 compression compared to most built engines that are traditionally 8.5:1 to 8.8:1 compression in this platform. I supect the higher compression helped you achieve 500+whp where as the 8.5:1 engine are falling short of this number by 40-50 whp. This info would have been helpful when I was deciding on my build since 500 whp was my ultimate goal.

 

that small bump in compression would not equal 40-50whp.

what was the temp/baro correction factor used on that dyno pull compared to the BP install you guys did the other week? Havent really followed the weather out there lately.

Which wastegate is on there? A big yellow is a 10psi spring for a F38, but I thought I read that kit uses the new MV-S gate, in which big yellow isnt an option.

The comment about needing more spring was referring to the stock 6 psi spring or the 10psi spring?

 

8:5:1, 14 psi with twins and good exhaust flow should net you around 500whp on a dynojet.

 

Your suspicion is incorrect. The difference in power loss between 9.3:1 and 8.5:1 compression ratios is about 1.5% (5% vs 6.5%) on a N/A motor. That's something like 7.5 hp on a 500 hp motor, nowhere near 40-50 hp.

When you are in boost with a turbo, the compression of the air/fuel mixture is effectively higher because you are pre-compressiong the air before it enters the cylinders. If you run enough boost, from the perspective of the burning of the air/fuel mixture, it will burn as efficiently as a high compression N/A motor. My suspicion is that 15 psi of boost with 8.5:1 compression will burn the air/fuel mixture as efficiently as a 13:1 N/A motor, though I have not specifically researched the subject. EDIT: it is actually more like 17:1 - see post below.

Here is a link to a chart of percent power loss vs compression ratio. I had it inserted as a pic, but it is too big and screws up the way this page of the thread is presented.

http://image.hotrod.com/f/editorials...nterprises.jpg

 

^^^

Here is the equation:

E = C((B/14.7) + 1)

Where
E = effective compression ratio
B = boost (in psi)
C = static compression ratio

So, if the static compression ratio is 8.5:1, the boost is 14.7 psi (I chose this for simplicity), the effective compression ratio is 17:1.

Thank you to Brian Cummiskey (whoever he is) in the hondaswap forum for providing the equation.

 

My statement was intended to point out that the higher compression was one of the factors for the increased whp not the only varible. I know when I went from my stock motor to a built one with 8.8:1 compression, I experienced a drop of 20-30 whp at the 8 lb boost level on the same dyno. There were other varibles like 264 cams, different turbo exhaust housing, etc, etc that could have affected the numbers as well.

 

P.S. Can't wait to see the different between the IP's DD and the dynojet results. IP's DD is truly an "Heartbreaker Dyno".

 

Please, more info/pics about the inline walbro pump.

 

Impressive as always Hal...


BTW...Rumor is you are bringing the DD to ZdayZ

 

Starting to sound like another vendor around here

 

ya it lets you extend a single walbro by keeping the pressure up. Not much more volume though. Just fine for that low-mid 600whp range.

Just using a single Aeromotive or DW 340lph is a better choice and I bet they will using that option

 

I look at this car, and I think this would be the PERFECT application to test a GTX35R vs a standard....
Leave all parts identical and run similar timing and see what happens....

 

^^^

I like that idea too.

 

dinner has came and gone.. wheres the numbers???

 

Seems like standard DD -> DJ conversion of 10%. But excellent prediction from Hal! Spot on!
Awesome #'s on pump gas with a single GT35r. Turbo still has more in it. Spin the motor out to 8000 rpms! Hopefully that will translate into the 67mm turbos being used in other kits!

 

nice numbers......

 

what are you using to control boost?

 

Very wicked results and good to see how much power this engine makes on pump gas.
This kit really has impressed me.

 

Impressive work!