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Heath's 500 HP ?!?! Landspeed Truck

D

DMDK

Diesel Obsessive
Messages
62
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1
Location
PSL,FL
First of all, got nothing but respect for Mr. Bill Heath. Has alot of dedication to the 6.5 and has helped myself out the past(3x) on my hicups.

But really surprised no one has commented on the article in last month Diesel Power Mag _ where they did a follow up on Heath's Landspeed 6.5 and on the top it says 500 HP. Or is it just true?
 
It was debated by some awhile back in the 6.5 performance section. I don't remember which thread but it's in there.
 
There is no dyno evidence that I know of, Bill says he isn't into dyno runs, but Bill calculated it distance over time over vehicle weight & speed and that calculates for him to 500 flywheel Hp, he said he's run his calc vs dyno in past and results are very close, this is sort of how those G-tech monitors work, but they use an accelerometer and plug in the g-force for acceleration as well.
 
The only thing I don't like about it is speculation. A mean dyno operator will ask you how much power you think you are making before putting you on the rollers. Seems as though he already set the bar without knowing how high he can jump.
 
It is an "educated guess" which I'm sure with proper calculations would be close.

Cattle are sometimes sold "on the tape", what they do is measure their dimensions with a tape measure. It is a fairly accurate measure of weight.
 
Meh, a calculated estimate is nearly as good as a dyno run IMO, as long as the data used in the calc is valid.

Thing is, dyno results can change from dyno to dyno and location to location.

What I find dyno runs good for is tuning in a setup rather than "bench racing" hp numbers....
 
dragogt said:
Right, but a good dyno run doesn't always mean a good E.T. or trap speed....
Click to expand...

Yup.

1000 hp is useless if you can't get it to the ground.

As I mentioned, I find dyno's good for tuning the engine and it's systems to optimal, not hp numbers.

If you actually want to do something with it, you have to tune the rest of the vehicle in the real world....
 
But there isn't any way of knowing where that power is being generated. A dyno gives worlds of information that you cannot get from estimations. I talked to Bill for a long time not long ago, but if you don't got some numbers it's all speculation. It doesn't take very much power to go that fast.
 
chevyinlinesix said:
But there isn't any way of knowing where that power is being generated. A dyno gives worlds of information that you cannot get from estimations. I talked to Bill for a long time not long ago, but if you don't got some numbers it's all speculation. It doesn't take very much power to go that fast.
Click to expand...


From my talks with Bill he has some comparative data vs dyno of engine on a stand, & has a "measured mile" he runs and within some reasonable margin of error to be able to make close "guess-ti-mations" of power being made.

Chasis dynos leave a lot to be desired, as many variables to skew the results, only way to really use a dyno is to have access to same one, on same vehicle, on same ambient conditions, which I why I've pretty much stop dynoing mine, that and seems that few dyno operators have them for the enthusiast to access at a affordable rate, they do it for the $$$$.

My seat of pant "azz-o-meter" dyno finely tuned butt-cheeks :D after many miles in the seat, let me know when I've lost or gained performance, doesn't help when seeking for bragging rights as no paper to back up the claims, maybe someday when I'm finished with mods I've been playing with or win the lottery and can better afford dyno time, I'll re-dyno mine.
 
Yeah, I suppose power is just distance over time time load or something like that. The dynos that I know of can correct for weather conditions, but it is true about different dynos giving different results. Just saying for less than $100 it would probably give some valuable information, notably the horsepower and torque curves.
 
chevyinlinesix said:
Just saying for less than $100 it would probably give some valuable information, notably the horsepower and torque curves.
Click to expand...

Nobody in my neck of the woods will give me dyno time that cheap, only time I can get it that cheap is on a dyno-day event, and that gets you 3 on & off runs "next truck please", no time to play with different setups.
 
Last time I talked to local dyno for time dedicated for me to play, they wanted $100-150/hr & minimum 3 hrs. plus M-Fri only when I have to be at work. They tend to cater to ricers, and gassers, and don't really like Diesels on their dyno. They offered to do tuning on mine yet none of them had ever been under the hood of a 6.5, so in order to make up for lost ricer/gasser revenue I'd have to pay same as them, they could care less about Diesel business.
 
For those that may be wondering why Heath is not being pilloried about 500 Hp claims, well it's because those that have showed up here in the past with same claims, claim they did it with just a 80 Hp reflash tune and very few other modifications, I don't recall anyone that has made a similar claim with similar serious modification work that Bill has made, has been "beaten up"
 
My thoughts are that if the mods made to heaths motor are what it takes to get to even 400hp@fly(and have longevity); then it would be somewhat worth it_ when compared to the newer diesels cost, components, and weight. Also give more new found respect to the 6.5 platform.
 
I dont think you need two turbos to go 158mph. But last time this topic was breached someone went a litte loco. I wouldnt badge my truck until I had some paper to prove it.
 
I don't undertstand what I'm missing. Before the install of the engine, just take it to a speed shop and have it dyno'ed that way. That will tell the tell for sure. All the race motors I saw built were dyno'ed. I actually was fortunate enough to be schoolmates with the son of a failry famous race engine builder and he built some crazy boat motors and they almost always were dynoed BEFORE install. The boat racing guys were the ones who spent REAL money. Race car guys were cheap...
 
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