Converter Slip %
Converter Slip % TH400 converter, 3400 stall I am getting 15% slip on top of 3rd and 10% on top of 2nd. What is everyone else getting.
http://tciauto.com/Products/TechInfo/Calculators.asp#4
http://tciauto.com/Products/TechInfo/Calculators.asp#4
Last edited by NEVR2ND; Nov 25, 2006 at 01:43 PM.
Thats not at all unreasonable for a non lockup converter ,
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Cool It will be interesting to watch , I like new information
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Personnally, I would be unhappy with 15% slip on a 3400 stall at redline. A 3400 stall is a relatively tight stall for these motors and if my engine is at 6600 rpm, I don't expect my output shaft to be at 5600 rpm. To me there are 3 possibilities:
1) It is not the right stall for your application.
2) The stall is not well designed.
3) The stall was not built properly.
I'd perfer to see 10% or less slip on the top end of 3rd.
1) It is not the right stall for your application.
2) The stall is not well designed.
3) The stall was not built properly.
I'd perfer to see 10% or less slip on the top end of 3rd.
I don't trust the slip% number much and prefer
to look at the more straightforward TCC Slip RPM
(or engine RPM - trans input shaft RPM). There I
have seen anything from 250 (TCI 3000) to 350
(TCI 3500, Fuddle 3500). These at 6000RPM. A
TCC slip% would be 3-6% here. 15% would be a
1000RPM slip and that's heinous. But like I said,
I do not trust the TCC Slip% value - I have seen
some crazy results from it (people saying they
have -400% slip etc.).
to look at the more straightforward TCC Slip RPM
(or engine RPM - trans input shaft RPM). There I
have seen anything from 250 (TCI 3000) to 350
(TCI 3500, Fuddle 3500). These at 6000RPM. A
TCC slip% would be 3-6% here. 15% would be a
1000RPM slip and that's heinous. But like I said,
I do not trust the TCC Slip% value - I have seen
some crazy results from it (people saying they
have -400% slip etc.).
Ragtop 99 I go with #2
I am trying to find out what kind of results everyone else is getting with a non-lockup converter, so I can justify dropping $600+ on a Yank converter, plus I am open for sugestions if there are beter converters at a reasonable price.
I am trying to find out what kind of results everyone else is getting with a non-lockup converter, so I can justify dropping $600+ on a Yank converter, plus I am open for sugestions if there are beter converters at a reasonable price.
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I'd take a look at Yank. They make (made) a converter that would lock-up for a TH 400 which is a nice feature if you take the car on the highway. Might even allow you go a higher stall, assuming that would be of benefit. 3400 is pretty small unless you have 410+ " or FI.
Stall speed is only one consideration in how much a converter will slip when you hit with an extra 200 shot. Not all 3800s will respond the same way.
My suggestion is that you look at a good nitrous converter if you want to spray 200. Going to cost you some extra $$ but a lot of your spray is being burned up as heat in the transmission rather than being used to get you down the track faster.
My suggestion is that you look at a good nitrous converter if you want to spray 200. Going to cost you some extra $$ but a lot of your spray is being burned up as heat in the transmission rather than being used to get you down the track faster.
On our Z28 with a TH400 with a B&M 4000, 8" converter we got about 89% efficiency going through the traps. Or about 11% slip from Engine RPM and Input Shaft RPM. Anything beyond that is not good in my opinion, especially on a smaller stall like your's. My B&M 3000 (2.0 STR) converter in my 2001 SS (4L60E) logged as much as 3% slip (or 97% efficient) at the top of 3rd gear.
Mind you, the size and STR will play a bigger part in efficiency, more so then the actual rpm stall.
Mind you, the size and STR will play a bigger part in efficiency, more so then the actual rpm stall.
