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Thread: Tuner Dope
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02-25-2020, 05:05 PM #1
Tuner Dope
I had a couple different tuners on the bench today, interesting comparisons...
I used the 225PM tuner as a "baseline" because all you guys are probably familiar with that one.
225PM bottom, early 1750 integral tuner top. The length is almost identical to the installed length of the 225PM tuner.
225PM top, 2.4 200 "bell" tuner bottom. This tuner is also found in the 150 XR2. It's about an inch shorter.
225PM bottom, 2.5 150/175 long tuner top. This one is a real choker, if you cut it to the 225PM length it is identical in size so don't throw it away!
This one is interesting. 225PM bottom, 1981 2.0 150 top. Identical except the 2.0 tuner doesn't have the exhaust relief holes. I don't know what other motors this tuner came on but it's a good one!
It's interesting that the basic length for performance applications stayed the same throughout the run. The exception is the 2.4 200 "bell" which falls a little bit shorter. I don't have a 280 style oval tuner or a Bob's to compare, those are the other styles you might be likely to come across. I do know that the Bob's won't fit in the can with the liner in place.
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mach351, Hydrodreams liked this post
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02-25-2020, 07:27 PM #2
I got one those 150 tuners from 81 150 and I thought sumone swapped it for short one but I guess not. Thanks for the post. think I'll go drill a few holes in it now haha
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nitro_rat liked this post
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02-25-2020, 08:05 PM #3
I remember pulling one of those tuners out of an Xr6 150 and literally laughing out loud.
'95 STV "The Blue Goose"
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nitro_rat liked this post
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02-25-2020, 08:40 PM #4
As long as you don't need the extra relief it will work better without the holes!
Yeah, the XR6 had the long tuner. This one came from a 2.5 175 EFI. It's funny that the XR2 was a hot rod 2.0 but the XR4 and XR6 are neutered 2.4's and 2.5's!
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02-25-2020, 10:21 PM #5Member
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Any thoughts on whatever tuner would be in a 93 2.5 200?
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02-25-2020, 10:31 PM #6
At idle with the runner underwater, it's a given the exhaust will follow the path of least resistance and make use of the holes.
At WOT do you think the holes ... ?
1) blow exhaust out of them.
2) column speed will vacuum fresh air in.
3) do nothing.
I reckon by the mid-late 90's they figured out that air stalls out in sharp corners ...
In some cases, it will actually go the wrong way. Put a piece of yarn on a wire and move it around inside of a port, collector, manifold runner .. you'd be amazed at what you see ..
Some say that this is a 300 Drag tuner that also came on a few 280's ...
This one is on a 1999 or 2000 .. 280 mid. From what I'm told this is considered the "standard" tuner they settled on .. ( musta ran out of the other ones or vise~versa)
Ex sperts, feel free to chime in ...
Gotta love the color of real gasoline ..
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Dave Strong liked this post
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02-25-2020, 11:53 PM #7
Chas, I'm torn between 3 and I don't care...
I do know that if your particular application doesn't require the holes there's no reason to drill them. At "ski" height my old 1750 doesn't always like to idle happily (I have a hydraulic plate) so I'm going to drill some reliefs in the integral 1750 tuner. I'll probably do some smaller ones than the promax style, more like the ones in the 2.5 long tuner.
The old 1750 plate also puts the tuner cooling water into the exhaust stream. I think I'm going to fill those holes and drill some behind the tuner at am angle like the newer plates have. Kinda a 1/2 @$$ dry stack...
Thanks for adding the hi-po tuner pics. I can't afford to play with that kind of stuff!
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02-26-2020, 06:29 AM #8
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Dave Strong liked this post
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02-26-2020, 10:57 AM #9
My reason for asking was, your statement about working better without the holes. I think the first reaction (mine too) is an exhaust with a hole in the pipe or muffler .. this can't be good. But in reality, a rusty header or blown out gasket leaks "out" because of pressure in the pipe. A tuner because of it's divergent shape "pulls" exhaust out, from the tip back to the port. I'm sure the hole will "shear off" some of the column, but to really pull air "in".. the hole would need a bump at the leading edge and to send air out it would need a bump on the far side of the hole. Much like how a NACA duct works. So in essence .. #3 .. the hole does nothing to write home about ... in case you ever decide to care ..
Mr. Tee,
The mid-can that plate-tuner came out of "has been thru a lot of modification" LOL So I don't know for sure and it's no longer here so I can't measure it ..
I do have a pic from the side with the hyroglifics written on it ....
When I first saw it, I thought that someone had cut it off a bit haphazardly. Then I noticed the casting flaws in the bell .. and changed from thinking someone had cut that particular one, to ... someone cut one haphazardly, and they quickly put that one into production ...
Chaz = thinking, that's only part of your collection ..
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Dave Strong liked this post
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02-26-2020, 11:22 AM #10
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02-26-2020, 03:31 PM #11
Seems like round tuna gonna flow better but hell idk ,, I'd still like to try me 1
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02-26-2020, 03:39 PM #12
For 90% of us, we would not know the difference. That is my opinion. Its like some props that ya run and just guess what one is faster. One may have ya all over the place to keep control and you think that one was way faster than one that just seemed all tame and stable, but once you put some measures to it the slow feeling one was faster. Most of us do not have the equipment to actually know the very small gain or loss of different things. I have a brand new 280 adapter and tuner at home and a hogged out BP one pc plate and tuner. I doubt I would know the difference between the two. Maybe I am wrong.......
1973 Viper - sold
1978 Viking - sold
1995 XB02
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02-26-2020, 07:59 PM #13
I'm a goin wiff this guy, he got it figgert out ...
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tux974 liked this post
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02-27-2020, 05:49 AM #14
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02-27-2020, 06:10 AM #15Screaming And Flying!
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