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Discussion Starter · #1 ·
Read some of the past posts regarding the #7 upgrade. Is everyone still happy with it? I have a 2003 350/385 and have gotten responses from "don't bother" to "the best money I ever spent". Seems to make sense to me to that the high stall would get up into the power curve to turn the tire easier. I would welcome any comments from those that have tried it....the money's burning a hole in my pocket.

Conrad
 

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Hi Conrad, The converter issue has been talked over quite a bit. Higher stall converters slip more under their stall speeds. This generates excess heat. I'm not sure what the stall speed is on the # 7? I think it's 2,800rpm's?

I've talked with guys that have the 3,500 stalls and they say in over-drive it will heat up the fluid real fast. Installing an extra Tranny cooler can make a world of difference on that.

On the other hand, The higher stalls really put the power to the wheel.

If I were to get one for my 1 speed, I would have a Coan ground up built to these specs. Stall speed in the 2,500-2,700 rpm range with the lowest possible multiplier. For the 2 Speed I'd go with a lower stall so you can use the overdrive. 2,300-2,500 and an extra cooler or two.

I've read that a high multiplier will put more power to the wheel at the start (great for burnout's) but still slips in the higher rpm range.

The lower multiplier does the opposite. Less initial power and a more positive lockup in the higher Rpm's.

That's about all I know and this has just been my opinion. I'm sure that others may know more and I hope they add to this.
 

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Conrad.....I have had the Nesco #7 in mine for 9 months now and must say it's the best money I have spent!!!
Started with a stock ZZ4 that was a Dog!!...I put in a GMPP HOT Cam that helped a little, then NOS and Edelbrock heads that helped a little more........Had some Carb work done by Carb Mike (which definately helped in the throttle response area!!)....Took out the HOT Cam and went with a Comp Cam.but when I put in the Converter she really came to life.
Looking back I wish I would have put in the converter first (They weren't making one though)...I believe the stock one was the problem all the time and it would have saved me alot of time and $....
Added an extra tranny cooler and Drive in 95+ days here in Fl. and have never had an over heating problem.
Don't let that money burn a hole in your pocket any more....Get ya one!!!....You won't be sorry.

Badger....Dave

 

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Conrad,

Wag & I both put them in last winter and have seen vast improvements on our cammed ZZ4s.......really make the motor come alive.

We both run trans temp gauges right in the pans and our operating temps only went slightly higher, about 10 degrees. We both removed our skid pans and the temps went back to the 150 to 165 degree range. We both ride 2 up more than 50% of the time and run pretty hard.

The highest temp I have seen on mine has never been higher than I saw with the stock converter.

My #7 stalls at 3600 rpm and I run down the freeway at 75mph @ 2500rpm all day and never see high temps......but that is just my experience......and Wags. I still shift into OD in town at 35 or so and still never see the elevated temps some have talked about.......BTW, Wag & I both did NOT add additional coolers to ours.

One other thing to try, change your fan switch to a higher limit, I put in a 195 in Sturgis and it makes a world of difference, the only time the fan ever comes on is sitting in traffic........otherwise the engine just sits about 180 degrees...........thanks Jack & everybody for the advice.........wish I had tried it a long time ago.

Tim
 

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Discussion Starter · #5 ·
Thanks to all of you for the advice. I'm going to try it. Not sure if I'll trailer it to MBH or let Marv do it at Biketoberfest. I never was strong on the patience end.

Conrad
 

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Corad...Just to throw a small fly in the ointment. I went to a Coan Boss converter which has a stall speed of 2500-2800. Much more positive hookup and a much higher quality unit. I run a 383 stroker with AFR heads and a Comp 432 series cam so I'm making much more torque at 2500 than a stocker. Don't know if this is applicable to you but with the heads and cam you have, you may be in a similar boat with me. The Coan is about double the cost of the Nesco (Dacco) unit but I love it.
Joe
 

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I think I'm in the market for a new converter, too. I ever thought to feel it would slip too much - especially at city speeds. 2 weeks ago I made the "WOT test" at 25 mph, and my ZZ4 revs up to 3500 Rpm until the engine/trans connection is tight :(
What stall speed you other single speed Boss owners experienced?

Loaf
 

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Loaf,

My stock converter hooked at 2500 rpm ..... the #7 hooks at 3600 rpm. I kept my stock unit just in case, and I'm sure a lot of them are laying around somewhere.

If yours is a stock unit, it is probably getting weak. I guess I'm not too sure about the "quality" issue between Coan & Nesco units today, but our #7's hook up very well and haven't fallen apart yet...........

Tim
 

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Love my Nesco and I have no heat problems at all. I have about 10K on this converter now and if I was to do anything to the Boss again, that would be my first mod. It makes the bike run the way you would think a 355 hp bike should run. I lay rubber everywhere I go and it's held up great. 8)

 

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Christ, Lamont!....that could cool a Viking pizza oven! For those of us not so mechanically inclined I wonder about the tranny heat although most say the #7 is fine. I don't really understand the reason that it's OK because we have always been told not to slip the converter because of heat generation whereas the #7 has to be slipping at anything below 100 MPH...Joe
PS...can you clip the pic I sent you and put it with my profiles? I'm so damn computer illiterate that I couldn't follow your instructions.
 
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