the STR,stall speed,& efficiency #'s for the different converter pump/stator combos.I'm looking to restall my #4 Vig,to either a #0 or #6 pump.Vig tells me they can get a 200 RPM increase or decrease in stall speed for any given pump. I assume they're doing this with a different stator.I'm thinking of having them use the #0 pump for it's efficiency & bump the stall another 200 RPM for it's obvious advantage.Kind of a compromise of the 2800 & 3200 converters.But I don't want to screw up STR or efficiency by doing this.Do you guys have that info?

 

Col is away until Thursday.

I thought changing the stator changes the stall speed.

 

Changing the Stator has a bigger impact on STR. Changing the blade angle on the pump is the easiest way to change the stall speed.

I just don't remember exact PI combo information.

BTW, I think Patrick may be away too. He was going to visit Mike at Yank soon and it might be this weekend.

 

Thanks Guys ,I'll put this to the top next week

 

Yeah, Mike is working on his car. I think they were doing the vacume modulator kit or something.

 

How bout it guys,are you back yet?
Patrick,make sure you post the results of that vacuum modulator install.

 

I'm back!

PI does not normally change stators when changing stall. They change the pump only, 99% of the time. They really like the 082 stator and put it in everything. A pump with a forward blade angle (#3, 4, and 0 pump)is going to be more efficient than a pump with a straight blade angle (#6 pump) and much more efficient than a negative blade angle pump (#7, 8, 5).

In a stock displacement LS1, these are the approximate stalls and STRs of the PI converters with the 082 stator.

#3 pump: 2600, 1.85 STR
#4 pump: 2900, 1.92 STR
#0 pump: 3300, 2.00 STR
#6 pump: 3700, 2.17 STR
#7 pump: 4300, 2.37 STR
#8 pump: 4800, 2.55 STR

Hope this info helps.

 

So,if they don't change the stator then can I assume that they must be changing the blade angle in the various pumps to get a +/- 200 RPM variation in stall speed for any given pump?
Is there any advantage to going in between the #0 & #6 pump,by using the efficient #0 pump & changing the fin angle slightly to get more stall out of it or should I just go for the #6 pump & forget about it?

 

PI quotes at +/-200rpm difference between pumps because it's easy and because it's pretty true with lower torque applications (like a 5.0 Mustang). On a torquey 5.7L LS1, the difference is much greater between pumps. For a free stall change, it's unlikely that Precision will do any blade angle changes...that's very labor intensive and time consuming. A pump change is quick and easy.

If it were my car, I'd get the #6 pump and be done with it.

Patrick

 

Thanks Patrick.Great info.Please let us know how the vacuum modulator worked out.

 

Patick,
I know someone who got a #0 pump (Positive blade) changed to a #6 pump. Did PE necessarily stick with the same blade angle? If so, how would the convertor compare to an off the shelf #6 (staight blade)?

Thanks

 

Mike,

If somebody is going to modify a #0 pump to be like a #6 pump, they would want to make the pump blades the same angle as a #6 pump. This is not a bad idea as the #0 pump blades are stronger than an off the shelf #6 pump.

It's hard for a company to make money when they're changing blade angles of the pump. Most will just swap pumps instead. I've seen Mike at Yank do this a bunch, but he's an artist. Not sure if many other converter companies do this on a regular basis. A modified #0 pump can stall the same as a 6 if modified properly.

Patrick

[ March 10, 2002: Message edited by: Patrick G ]</p>

 

How would an 086 stator affect those pump STR’s? Raise them? Lower them? Does PI use that stator at all in any of their converters?

 

This marks the oldest thread revival I've ever seen. 17 years, 11 months and 353 days. Impressive!

 

That was what I was hoping for. I think all those members are all gone. This was a great thread with awesome info on TC pumps. I was serious about my question though. No love for the 086 stator out there?

 

Yes, they are gone. Plus if you want answers regarding regarding internal torque converter components, it'd be best to start your own thread in the auto trans forum. This forum has to do with rear ends.