I'm guessing Don has some great flowing heads. My heads aren't ported that great. I'm seeing 15psi with a 6lb lower and 3.5" upper with my KB...that is about a 2.54:1 blower ratio.

Don what does your lower 8lb pulley measure? If it measures 9.16 you have a 3.05:1 blower ratio.

What do you have for fuel system?


edit I made some math errors

I'm spinning my blower at around 13,208 rpm at 5200 engine rpm. You are spinning your blower at around 15860 rpm at 5200 engine rpm and getting your peak HP...And we both have the same amount of boost 15psi. How much more air does that 2500K rpm put into the engine?

 

First off great numbers!!

For those who think 15 psi is low for his pulley combo you need to remember he has ported heads and different camshafts. That can greatly reduce the amount of boost that would have been present before. The engine is more effecient now and has less restriction than it would being stock.

Good Luck on some more ponies!!!!

Thanks Mike

 

I think Steve (Calightin) is a bit curious of the boost because he has a similar combo, and sees totally different boost levels. He's got ported heads, cams, and the Works 140, and he's made 18 psi with a 3" upper and just a 2lb lower. The Whipple is a tad larger, but not a huge amount (140 ci vs 134 ci) and both blowers are the same screw design, so you'd think the boost numbers would be very close to the same.

BTW, I am NOT trying to start another Works vs KB debate here, I am just curious as well, because both units are similar size and displacement, so I'm a bit baffled at the boost difference as well.

 

Like Don said, belt slippage. I think that should cover it, no? Apparently, the works gets a little better traction on its pulley!

Don, when will your Reichard upper be in? And, is it the same upper as you would buy for a stock blower?

 

Sal I would have to agree that you would think the boost level would still be higher. It could be belt slippage or the camshafts the two trucks have could be different. The Kenne Bell has a low maximum rpm rating so volume could be problem also??

Oh well good numbers again and don't let anyone rain on your parade!!

Thanks Mike

 

We were getting major belt slippage yesterday, the KB pulleys are pure gunk. If you look at the pulley the raised part of the groves are narower and the edges are not squared off like a stock pulley. They are actually allmost pointed on the edge, when we ran it at the track and put vht on the belt we got 18# of boost. So that shows how much it slipps when the belt wasn't treated.

Here is a pic of the pulley

 

Don
You nailed it, that is why it is slipping. Why dont you guys throw the pulley in a lathe and knock the tops off of those peaks and then glass bead it. It would be a quick fix for now.
Dale

 

HD...thats some funny stuff man, your gonna force Don to start spraying aren't you!!!!

Don...Comgrats on those numbers! That is going to be an ANIMAL!!! I want a ride this summer bud. And I forget...is silver faster than White????

 

You northeast guys are scary

--Joe

 

I think this question has been asked 3-4 times now were you using nos or no?

 

I can answer that for Don.............NO

 

Hey Don
Any chance of posting some video of one of the dyno runs with some sound.
I am still playing the one of you guys doing donuts in the parking lot.
The sounds are great!
Good Luck on your qwest for power. Hope she holds together for a long time.

 

Don

Congrats on the current progress. Hopefully everything gets worked out by Wed. Maybe I'll get to see you run

 

Im still having a hard time understanding everything maybe im a little slow.. So your saying you made that amount of power with a slipping belt? and it is supposed to be 18psi but u only showed 15psi? sorry if you feel like im beating a dead horse just when high numbers like this come how I just want to know how?

 

Great numbers don! This may have been asked but what fuel system mods do you have to keep up with all of that air flow?