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I just finished the Coan covertor install and let me tell everyone it was the best money I have ever spent. Great performance, great service from Coan, all around great experience. I would urge anyone that was thinking about doing this to do so. Craig at Coan is probably the most helpful and friendly person I have ever delt with. I am not saying that it is any better than the #7 since I have never owned one of those it has always been stock for all the Hosses I have owned but never again!!! I will always go back to Coan in the future.

Chopperman
 

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I do not know anything about the Nesco Converter, but I can attest to both the Coan and Craig. It was a great addition to my Boss, as a matter of fact, I had one of the first, if not the first "ground up built Coan". The only problem I have, and it is no problem, is when sitting in heavy traffic, I sometimes kick it in neutral because of the Boss wanting to go. Craig was a pleasure to deal with, but on the other hand Jim at Nesco has been a pleasure also. I really would like to hear from someone who has experience with both.
 

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Nesco guy here and I wouldn't own a Boss that didn't have a high stall converter. It makes a small block run like you would think a 355 hp bike should run. :twisted:
 

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This question was asked recently, but I don't think anyone replied:

Has anyone installed the Nesco or Coan converter in their 502 Boss? I would like to hear from anyone who rode thier 502 for a while with the stock converter, then swapped it out for the Nesco/Coan and can report on their findings.

Bill
 

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Bill,

I had to pull my tranny last spring and went with the COAN. As Elliot said in another post somewhere the Coan eliminated the tractor feel when you 're starting out. I am very happy with it. Craig at Coan is a super nice guy. It is quite a bit higher than the NESCO but I think Elliot will tell you that it is worth the $$. I think it is, too.

Chris
 

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I have to thank Russell for leading me to the Coan. I, too, have never tried the Nesco #7 and I think it is a higher stall than mine but this converter is so much more positive than the stock Nesco. I also have to give my accolades to Craig at Coan who knows his **** and is a pleasure to deal with...Joe
PS. Not sure about the exact stall speed but believe it is between 2500-2800 rpm if I remember Craig's comments correctly.
 

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Chris and Elliot,
Help me understand what "the tractor feel" is. I may be experiencing it and don't know it since I am used to the feel of the stock converter on my 502.

Are you meaning that your 502 was sluggish off the line? I just can't imagine that since I can smoke the tire at will and, frankly, I'm scared to "whack" the throttle 100% from a stand still. The bike would be all over the place spinning the tire etc.

I'm pretty much sold on the Coan or the Nesco. I'm just still looking for reasons why my big-block needs what it offers.


Bill
 

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Mike,

Depends on the converter. A NESCO #7 is about a 3000 to 3500 stall converter. There are other stall speeds, i.e.#5, etc and Coan will build it where you want it.

3500 rpm is about the peak HP & torque for the ZZ4 average....so the converter is hooking up where the motor is in the "sweet spot" so to speak. You won't have to worry about doing burnouts from a stop, you should be able to them nicely at any speed below 40mph depending on your motor.

I think the NESCO is around $600 (???) depending on where you order it from. Coans is considerably higher but supposedly a unit comprised of better parts (the debate goes on)....I've had my #7 in for about 4000 miles, shelled one 280 Metzler in 1800 miles and am working on a car tire now.............plus I run 125hp NOS set-up.....for me the NESCO has performed extremely well. I drained the tranny after 4000 miles and it was clean enough I could have reused the fluid.

Tim
 

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GRUMPY said:
Mike,

Depends on the converter. A NESCO #7 is about a 3000 to 3500 stall converter. There are other stall speeds, i.e.#5, etc and Coan will build it where you want it.

3500 rpm is about the peak HP & torque for the ZZ4 average....so the converter is hooking up where the motor is in the "sweet spot" so to speak. You won't have to worry about doing burnouts from a stop, you should be able to them nicely at any speed below 40mph depending on your motor.

I think the NESCO is around $600 (???) depending on where you order it from. Coans is considerably higher but supposedly a unit comprised of better parts (the debate goes on)....I've had my #7 in for about 4000 miles, shelled one 280 Metzler in 1800 miles and am working on a car tire now.............plus I run 125hp NOS set-up.....for me the NESCO has performed extremely well. I drained the tranny after 4000 miles and it was clean enough I could have reused the fluid.

Tim
My tranny oil and filter have been relatively clean for that last two changes. I have the stock nesco for the 2002. I don't know what you are talking about when you mention the #7 or #5.

I have been out of the loop, so to speak, concerning tranny changes. The last time I remember is a lot of people were talking about the coan as a marked improvement over the nesco converter. Is it now that what nescon has is as good as the coan?

Mike
 

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Mike,

The NESCO numbers refer to the stall speeds built into the converter. The #7 stalls higher than the #5, and the stock is a #3 I believe. Your stock converter stall speed is about 2100 to 2500rpm.

The question of which is better is each persons opinion. Personally, I have had excellent luck with both the stock converter and the high stall NESCO that I put in last year. However, Coan is well known for their high quality race converters, and everyone here who has put one in has raved about them.

Most engine guys will tell you that on a ZZ4, going from a 2100 stall to the 3500 stall, is like adding 70hp to the motor, just because it allows the engine rpm to get into that "sweet spot" before applying full hookup to the converter.

Ask anybody who has gone to the higher stall speed, and they will all tell you that the bike is just wild compared to prior performance.

Tim
 

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I'm beginning to see that the converter stall speed is something that should be matched to the motor. My little 383 CID stroker makes much more torque at lower RPMS than the stock small block and so a lower stall converter works great for me. The Coan is fantastic for my application with about a 2800-3000 stall speed but if I had a stock motor would probably go higher with the stall speed ....joe
 

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Don't want to seem dumb here, but what the heck. With a 2800 stall converter, does it slip a lot at 60mph in overdrive?
 

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Crazy,

In reality, the converter is not at maximum engagement when under its' stall speed, however, at 2800 going down the freeway, the only time your going to notice it is when you jump on the throttle and see the rpm 'spike' to the stall speed.....you have to be looking hard, 'cause it takes only a second or so. On ours it would be 2800 to 3600...don't take long to get 800 rpm on a small block :)

A number of us running higher stalls also have temperature senders in the gearbox, and for mine and Wags bikes, our temperatures did not change over the operating spectrum from the stock converters to the high stalls. I monitor the tranny as much or more than the motor, and it never runs hot.

Tim
 

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Crazy....as Tim says the stall speed is where the converter supposedly "locks up" and theoretically SHOULD be slipping somewhat below that stall speed. Everyone that I can see, however, reports no noticable slippage at highway speeds below that RPM and no temp increase in the tranny.
I went with a lower stall speed Coan because my small block stroker makes more torque at 2500 RPM than the stocker does at 3500. I, actually, didn't want a higher stall because I didn't want all that torque hitting the rear wheel at that RPM since I can smoke the tire at will with the lower stall.
What I'm saying is that the converter stall speed should be matched to where you want "lockup" although I'm told by Craig at Coan that our converters never truly lock up.
A whole bunch of knowledgible people recommend the higher stall for stock small blocks.....Joe
 
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