That is true, throttle response on the Dmax is not that great till the turbo is spinning good.


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And even then this boost has a very limited effective RPM range compared to 8.1. For half the price of a Duramax option you can get a 8.1 and buy a supercharger and boost if a mere 6psi (vs Duramaxs 22 to 25PSI) and get over 500HP and over 600ftlb of torque over a 3000+ RPM range. It would eat the Duramax up and spit it out. Raise the boost on Duramax you say? Sure you can and the torque peak gets narrower and the further you go you play russian roulette with which will fail first, The Duramax fro m boost or EGT or Allison. Besides, you can get hairy with the 8.1 and run 8 or 10 lbs of boost and get close to 700HP and well over 700ftlb over the same broad range and the duramax will never catch it no matter what you do to it! You will have a hard time getting a supercharger 8.1 to launch though do to tire spin as with a supercharger of root type throttle responce is instant unlike a Diesel! </DIV>
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<DIV class=postcolor> 700/700 from the 8.1L for less then $2000? I think it is a 100% cock an bull story!</DIV>Edited by: hdmax

Umm.. how about no. http://www.dieselplace.com/forum/smileys/Ermm.gif 4500 bucks and the best it will do is 14.6? Even though this is a Suburban, the weight is about the same, the Sub may weigh less!


TS9000-8.1 KIT 100 4150.00 6 PSI KIT ('01 UP 8.1 GM)W/COMPUTER UPGRADE,NEW INJECTORS,NEW BUMPER COOL AIR KIT



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<DIV align=center>STOCK 8.1 vs KENNE BELL SUPERCHARGED
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I haven't heard of any superchared 8.1's even breaking into the 13's

It's all about the utilized area under the torque curve. 692 lb. ft of torque is *weak*.


This is actually a good example of why horsepower is a lousy indicator of drag racing performance. A 455 hp Duramax would probably be a full second faster than that Suburban as it would likely have 900+ lb. ft of torque...

I haven't heard of any supercharged 8.1's even breaking into the 13's You are alive!http://www.dieselplace.com/forum/smileys/Big Smile.gif You have been very quite of late. How is the truck doing? Have you made it to any races/truck pulls this spring?

Iwould rather mod an engine that came factory equipped with a turbo.... stronger internals to take the cylinder pressures, prts valves, manifolds designed for the unnatural aspiration than cobbling something on a high compression gas engine and waiting for the inevitable.


Be that as it may, i rather like Diesel fuel economy and think that dude should go back to his crack pipehttp://www.dieselplace.com/forum/smileys/Big Smile.gif

Looking at the Kenne Bell web site it looks like the 8.1L gets to 400 rwhp for a grand total of 100 rpm. The guy I quoted claims 3000 rpm at 500 hp. Looks like someones math is off a little.http://www.dieselplace.com/forum/smileys/Approve.gif


I tend to believe Kenne Bell knows what a supercharger puts out.http://www.dieselplace.com/forum/smileys/Big Smile.gifEdited by: hdmax

I BET ITS RUNNIN INTO THE 5 AND 6'S........MPG'S THAT IS !!! AND AT 2 BUCKS A GALLON V/S 138 FOR MY RED DIESEL, NAAAA I DONT THINK SO !

How's your luck been with running red dye?

That seems a little slow for that big block since I know a guy with a blown 6.0 in a lifted 2500hd with 35 inch tires and stock gears and he has run 14.07 with less than great traction.http://www.dieselplace.com/forum/smileys/Confused.gif


If it has an ally in it, that could be slowing it down? Nothing against the beloved ally but I'm sure it robs alot more power that the 4L80E does.

The suburban with the 8.1L has the 4L80E or 4L85E, I don't remember which.


The pickup would have the Allison in it with the 8.1L


I really don't think that Kenne Bell would say the truck is slower then it really is. After all they are trying to sell performancehttp://www.dieselplace.com/forum/smileys/Approve.gif


your buds truck could have the 4:10.1 rear axle, while the burb may have 3:73.1 that would make some difference.

Is it possible to put a supercharger on a Dmax? My step brother works for Vortech superchargers and he told me that they put one on a dmax. Maybe he didn't notice that it wasn't a 8.1 but unlikely. he's supposed to get me the info this week.new for me.

I would think it would not be too difficult for a supercharger company with enough resources, but I don't think the gains would justify the cost. Edited by: Amric

He said that they have only sold like two so far.

Superchargers for diesel has been around for a while. And you can get turbos for gas engines.

they use to run both (turbo&amp;charged) on the old two stroke diesels. It was an unusual setup that took up a lot of space.

hmmm,both eh????http://www.dieselplace.com/forum/smileys/Embarrased.gif

Unlike a turbo, a roots-style blower is "on" all the time. A turbo has much lower losses at cruise. So when cruising, a 400rwhp blown 8.1 will suck fuel (premium gasoline) at a pretty good rate, so you will pay for the blower every day you drive the truck. So even the $4500 price is misleading, after the first year it will probably add another $500 to your cost of operation. Run it 9 years, and it becomes your $9000 blower.


One of the major problems with taking a stock gas motor and supercharging it is the detonation issue. If at any point, due to fuel restriction, bad fuel, part failures, etc, you go lean when on the boost, your engine's life expectancy will be measured in minutes. Sometimes seconds.


On the other hand, you can run 400rwhp in a turbo diesel with transmission mods (which you will have to do to the 8.1 as well if you race it) off pump #2, without a significant difference in cruising mileage. And if it suffers fuel starvation, all it does is reduce your HP, not reduce your pistons to sl*g.


IMO...

Uh... Why is S L A G a restricted word? Are there some cusswords I haven't learned yet?

they use to run both (turbo&amp;charged) on the old two stroke diesels. It was an unusual setup that took up a lot of space.


Those were the Detroit Diesels, extremely sluggish on the low end, yet screamed on the top end. very dirty emission wise. No intake valve, only ports like a motorcycle. Four Exhaust valves in the head. Supercharger and turbo did not create boost, but only purged the cylinder when the piston was at bottom dead center.