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Old 12-08-2009, 03:54 PM   #21 (permalink)
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Obviously Gadgetman showed J. Shelby the "gas cap trick":

Lift up the gas cap and replace the vehicle underneath it.

No wonder J. Shelby is ecstatic with the results!

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Old 12-08-2009, 03:55 PM   #22 (permalink)
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LOL Yup. Of course, the point I was trying to make is that it's a Ford F-series, being represented as a GMC.

The headlight profile and raggedy body lines give it up quickly.

It's also a few years older than a '99... In fact, the newest it could be is either '95 or '96, can't remember which.
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Old 12-08-2009, 04:02 PM   #23 (permalink)
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looked like diffrent girls in by her fiat too.

I wonder if he would agree to the A-B-A testing used around here and let the money sit in escrow.
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Old 12-08-2009, 05:03 PM   #24 (permalink)
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Gadgetman must be really blind then.
They say he is 95% impaired...
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Old 12-08-2009, 07:37 PM   #25 (permalink)
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Quote:
Originally Posted by Christ View Post
LOL Yup. Of course, the point I was trying to make is that it's a Ford F-series, being represented as a GMC.

The headlight profile and raggedy body lines give it up quickly.

It's also a few years older than a '99... In fact, the newest it could be is either '95 or '96, can't remember which.
It's a '92-'96 F-series.
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The presence of traffic is the single most complicating factor of hypermiling. I know what I'm going to do, it's contending with whatever the hell all these other people are going to do that makes things hard.
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Old 12-08-2009, 07:39 PM   #26 (permalink)
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Thanks Dave, I knew that in '97 it was the cab-over-engine body style, but I wasn't sure if it was that way in '96 or not.

Appreciate it!
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Old 12-08-2009, 09:14 PM   #27 (permalink)
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Here's a youtube of what he claims to be doing -- the "gadgetman groove". I'm pretty sure it is the same guy.

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Old 12-08-2009, 09:22 PM   #28 (permalink)
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Yeah, he's claiming that by increasing turbulence aft of the throttle plate, you're creating a resonance that is, in effect, a supercharger at certain speeds. Of course, intake length/cross section tuning achieves this as well.

I'm not entirely sure that those grooves will do anything except completely kill the flow velocity, but I can assure that at higher throttle angles than cruise, they won't be increasing horsepower, as they'll be restricting airflow by creating more turbulence. Keep in mind, even pipes have a boundary layer. The effective cross section of an intake pipe is actually smaller than the visible cross section, and is increasingly so as intake velocity increases.

There is no evidence that a completely smooth intake tract is any more beneficial than a lightly roughed up one, but I'd be extremely wary of grinding out any kind of slot in my throttle body and expecting any gains from it. They're usually not cheap to be carelessly modifying.
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Old 12-10-2009, 03:33 AM   #29 (permalink)
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Anyone wanna try it? I found the guy on PES' website showing how the grooves are made.

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Old 12-10-2009, 03:34 AM   #30 (permalink)
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PES' wiki page on the mod:

Directory:Gadgetman Groove - PESWiki

It appears that basically, all that's being done here is adding approx a 3mm deep groove in front of the lower part of the throttle plate, and behind the upper.

So what's really happening is a trick way of telling the ECU that you're at X throttle position while you're allowing the same amount of airflow as Z throttle position. Other than that, I can't say for sure. I may give it a shot on the spare TB I have for my wife's Saturn, though. It takes about 10 mins to put the TB on, so that shouldn't be a problem.

EDIT: OF course, if I do this, and there is no change/negative change, the guy's just going to say I did it wrong. It won't be an extremely definitive test, either. I'll see about using my datalog tool to check MAP and TPS values, etc.

EDIT again: Wouldn't you know, I can't find my Dremel. Gonna have to buy another one, again, it seems. O well, excuse to go to Harbor Freight.

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Last edited by Christ; 12-10-2009 at 03:39 AM..
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