I have only seen 3rd gear pulls on an auto..someone please explain!!!!!!! 
locking a converter on the dyno
Launching!
Joined: May 2003
Posts: 290
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From: Canadian West Coast
3rd is your 1:1 gear. I believe you can convert the numbers from 2nd gear to 3rd (I'm not positive about this), but WHY someone would force you to dyno in 2nd is silly, unless they were so concerned about their dyno that they don't want it spinning that fast (which I doubt is right). You always dyno in the 1:1 (or closest to that) gear.
Originally Posted by Tech
LOL. Yeah, WTF? Tell him you want your money back. You should have dyno'd in 3rd.
Most folks who are serious about tuning spend more time on the street/strip tuning then they do on the dyno. In this case, he was asking about WOT on a dyno. Specifically, a Dynojet.
Most folks who are serious about tuning spend more time on the street/strip tuning then they do on the dyno. In this case, he was asking about WOT on a dyno. Specifically, a Dynojet.
Rick
Teching In
Joined: Jun 2005
Posts: 21
Likes: 0
From: Conover, NC
Actually you wouldn't loose anything. Your torque numbers would be high though because your multiplying by the transmissions 2cnd gear ratio. I have heard of other Dyno Jet owner doing this before to try to get higher numbers to show up. Dyno Jet is mostly about marketing and less about quality tuning tools. Always do power pulls in 1:1 or closest to it. Steady State tuning on the other hand can be done in any gear because all your after is the Kpa or (load) of the engine. With eddy current you can hit all of these cells in any gear. Remember, just because a shop has a dyno doesn't make them a good tuner especially if they own a Dyno Jet. All it means is they had good enough credit to buy it.
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Originally Posted by TruDynoSports
Actually you wouldn't loose anything. Your torque numbers would be high though because your multiplying by the transmissions 2cnd gear ratio. I have heard of other Dyno Jet owner doing this before to try to get higher numbers to show up. Dyno Jet is mostly about marketing and less about quality tuning tools. Always do power pulls in 1:1 or closest to it. Steady State tuning on the other hand can be done in any gear because all your after is the Kpa or (load) of the engine. With eddy current you can hit all of these cells in any gear. Remember, just because a shop has a dyno doesn't make them a good tuner especially if they own a Dyno Jet. All it means is they had good enough credit to buy it.
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Thread Starter
TECH Fanatic
Joined: Apr 2005
Posts: 1,338
Likes: 0
From: upstate ny
Originally Posted by TruDynoSports
Actually you wouldn't loose anything. Your torque numbers would be high though because your multiplying by the transmissions 2cnd gear ratio. I have heard of other Dyno Jet owner doing this before to try to get higher numbers to show up. Dyno Jet is mostly about marketing and less about quality tuning tools. Always do power pulls in 1:1 or closest to it. Steady State tuning on the other hand can be done in any gear because all your after is the Kpa or (load) of the engine. With eddy current you can hit all of these cells in any gear. Remember, just because a shop has a dyno doesn't make them a good tuner especially if they own a Dyno Jet. All it means is they had good enough credit to buy it.
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Now before anyone gets their panties in a wad, some newer Dyno Jets do have eddy current, but they are still way behind on the technology in my opinion.
Aaron-
Teching In
Joined: Jun 2005
Posts: 21
Likes: 0
From: Conover, NC
Yes for sure before CATS. If your sure that the AFR is close then at the tailpipe is ok for some WOT measurments but not for tuning, it may be a half point leaner than actual AFR. I always weld in an extra bung on any exhaust that I do, and have told my customers to do so in the future so as to be more accurate. I have several builders that bring their cars to me for tuning and most of them will now weld extra bungs in the exhaust for this purpose.
Aaron.
Aaron.
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Joined: Jun 2005
Posts: 21
Likes: 0
From: Conover, NC
Based on your numbers I would GUESS that your loaded (actual) WHP would be more like 315-320hp could be as high as 330's. Now this is due to how Dyno Jet measures hp. They simply take a know mass (rollers) and calculate against a known speed and acceleration factor to come up with a hp number. This is called inertia and I'm sure there is a better explanation with more intense math on here somewhere. One thing that some may not know and that Dyno Jet will admit to with some pressuring is that they also input a fudge factor into their computing that basically calculates bHp or hp at the flywheel. Which with some of the numbers you see makes sense. Hope this helps some.
Thread Starter
TECH Fanatic
Joined: Apr 2005
Posts: 1,338
Likes: 0
From: upstate ny
Originally Posted by TruDynoSports
Based on your numbers I would GUESS that your loaded (actual) WHP would be more like 315-320hp could be as high as 330's. Now this is due to how Dyno Jet measures hp. They simply take a know mass (rollers) and calculate against a known speed and acceleration factor to come up with a hp number. This is called inertia and I'm sure there is a better explanation with more intense math on here somewhere. One thing that some may not know and that Dyno Jet will admit to with some pressuring is that they also input a fudge factor into their computing that basically calculates bHp or hp at the flywheel. Which with some of the numbers you see makes sense. Hope this helps some.
I always lock it on the dyno when tuning. There is no way I can tune correctly unless I do. I don't think its that bad for the converter, its already locked before going WOT.
Nowt if you lock it when you are already WOT, then I can see damaging you TC.
Nowt if you lock it when you are already WOT, then I can see damaging you TC.
