You wont need to run the blower out of it's range, just 4-5 psi...

 

Yep...

 

Zippy did you forget Ive had a stroker motor truck and I now drive a diesel I think if there is anyone who could do a direct comparison it would be me. My Z71 in its last form was running 9.3:1CR with a 224 cam, 3.73 gears and a stock 80e stall and it had 420 cubes in a 5200# truck, my dmax is 400 cubes with small tow tune, 6800#s and 35s. Flat footing my dmax from a dig nets better acceleration then my Z71, its the massive surge of tq when the turbo lights off that spoils me and makes me bitch about lack of low end when it is actually pretty good. The 35s and 20s suck up ALOT of power too, with stock wheels it will spin them all the way through first but with the 35s it leaves light black marks then with the turbo spools they get dark and it starts fishtailing a little. Either way the success of the Helion kit on the 03/04 cobras to me proves that twin charging works along with all the diesel apps that use it. You just have to remember that the diesel apps can get away with a higher price tag therefore it is more prevalent then in the gas performance world. Not mention there arent very many people with gas motors into performance that have the dough to spend and with more efficient superchargers on the market now the gains to be had are now where near worth the cost IMO.

 

didn't slowhawk dyno some car that had a turbo and a twin screw a few months back? Mustang maybe? can't remember exactly

 

I've heard of the mustang, I dont have any other info though..

 

I'm a dyno queen.

 

Yeah you are, but you look good.

I drove this truck something like 300', at no more than 5mph, and it felt like a caged lion looking at a sexy zebra. I nearly needed to change my diaper afterward. Rick, those numbers are amazing!

 

I certainly remember what you've had. Considering that you're comparing what you have to what you had it's still an odd comparison. Your 4L80E's first gear is 2.48 to the Allison's 3.10. As a closer comparison I drove a Silverado SS (with a 4L65E) for a while with a very mild 6.7L. It had stock heads, 212/218 cam, truck intake, and basic bolt on's. For the most part it was just more cubes and not much else changed from the 6.0L. With only a TB converter that truck had enough torque off idle to spin the tires (front and rear). If you remember correctly, with your 418 and your 4L60E your truck would kill the tires also right off idle. A diesel isn't going to have near that kind of response until it's into boost. Fortunatly with decent programming and the new variable vane turbo they spool considerably quicker than they used to. My opinion for getting the closest thing to getting the joy of boost and very little lag with high efficiency is a bigger cube engine (6.0L and up) with 10:1 compression or higher and 8-10psi of boost.

 

You are forgetting that my 418 flashed my converter to over 4K, the diesel only goes to about 1500 if I had a higher stall it would be a lot better but peak tq when the turbo is spooled is around 1700 so Im hesitant to go any higher since I don't drag race it. The first gear ratio is different and a lot better in favor of the allison trans but my dmax is lugging around 2000 extra pounds too. Either way if the tvs 2300 does what its suppose to im not going to worry about turbos for my next project.

Rick when are you going to get the blue whale to the track?

 

Funny, that looks like my new engine specs...............