|
|
Re: What is good converter slippage?
[Re: ragingram]
#1048685
08/07/11 05:22 PM
08/07/11 05:22 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
My friend uses a Bruno and he says he has his locking up at 98%
I've checked how well my 727 is locking up and its is always between 96-98% Usualy 97%
Is that good or bad? Never really checked it out before.
Are you talking a "lock up converter" if so thats
not great.... if your talking a normal "NON lock up"
then I would say go back and check your numbers ...
that is almost too good to believe... if you get
5% slippage you should be real happy... if you get
3%... jump for joy because thats SUPER GOOD
|
|
|
Re: What is good converter slippage?
[Re: ragingram]
#1048690
08/07/11 06:41 PM
08/07/11 06:41 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
It is a Dataquest by altronics.
There is no shifting. pulling off the line in 3rd (dirrect). The differentials are REALLY low gearing. Usually have a final gear ratio of 21-1 to around 23-1
Since your reading a data logger what does it say it
is at about 5000 rpm... if its a 2800 stall or so
it should show about the same.... to be honest I've
never seen (or heard of) 2% slippage... unless some
numbers are wrong..... I have a driveshaft sensor
so it is a direct relation to the engine rpm... the
engine rpm is X and the driveshaft is X = the conv
slippage
|
|
|
Re: What is good converter slippage?
[Re: MR_P_BODY]
#1048691
08/07/11 07:01 PM
08/07/11 07:01 PM
|
Joined: Aug 2008
Posts: 78
Canada/USA
ragingram
OP
member
|
OP
member
Joined: Aug 2008
Posts: 78
Canada/USA
|
Quote:
Quote:
It is a Dataquest by altronics.
There is no shifting. pulling off the line in 3rd (dirrect). The differentials are REALLY low gearing. Usually have a final gear ratio of 21-1 to around 23-1
Since your reading a data logger what does it say it
is at about 5000 rpm... if its a 2800 stall or so
it should show about the same.... to be honest I've
never seen (or heard of) 2% slippage... unless some
numbers are wrong..... I have a driveshaft sensor
so it is a direct relation to the engine rpm... the
engine rpm is X and the driveshaft is X = the conv
slippage
I understand what you mean. The data logger won't tell me the right slippage because my driveshaft sensor is on my lower driveshaft. Not the one coming right out of the engine. I need a full shield around my top driveshaft (trans to transfer case) so i couldn't put the sensor there. So all my data logger is properly telling me is the MPH of the tire speed. When it tries to calculate the slip on its own its calculating it from just the 6:80 gears in the differentials and not the reduction in the transfer case also.
If i tell it the final ratio it will get the slippage right maybe but then the mph wrong. I've called altronics and they were working on an idea how to fix my problem so it would read both properly without being on the top driveshaft.
So when i calculate the slippage I take the MPH of the tire that the Data logger is telling me. Then im dividing by the speed they should be turning if there was 0 slip.
Isn't it true though that a lower stall converter will have less slip at higher RPM's then if it was a 5000 stall? i just remember hearing that somewhere.
|
|
|
Re: What is good converter slippage?
[Re: ragingram]
#1048692
08/07/11 07:29 PM
08/07/11 07:29 PM
|
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
master
|
master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
|
Quote:
Quote:
Quote:
Isn't it true though that a lower stall converter will have less slip at higher RPM's then if it was a 5000 stall? i just remember hearing that somewhere.
Yes thats true! IMO it shouldnt matter if your sensor is on the second driveshaft off the transfer case. As long as you use the correct mechanical gear ratio.
|
|
|
Re: What is good converter slippage?
[Re: Sport440]
#1048693
08/07/11 07:50 PM
08/07/11 07:50 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
Quote:
Quote:
Quote:
Isn't it true though that a lower stall converter will have less slip at higher RPM's then if it was a 5000 stall? i just remember hearing that somewhere.
Yes thats true! IMO it shouldnt matter if your sensor is on the second driveshaft off the transfer case. As long as you use the correct mechanical gear ratio.
 ... the sensor should be reading the same
as on the front shaft .... and yes low stall will
have less slippage so maybe you are in the right range
|
|
|
Re: What is good converter slippage?
[Re: MR_P_BODY]
#1048694
08/07/11 08:16 PM
08/07/11 08:16 PM
|
Joined: Aug 2008
Posts: 78
Canada/USA
ragingram
OP
member
|
OP
member
Joined: Aug 2008
Posts: 78
Canada/USA
|
Quote:
Quote:
Quote:
Quote:
Quote:
Isn't it true though that a lower stall converter will have less slip at higher RPM's then if it was a 5000 stall? i just remember hearing that somewhere.
Yes thats true! IMO it shouldnt matter if your sensor is on the second driveshaft off the transfer case. As long as you use the correct mechanical gear ratio.
... the sensor should be reading the same
as on the front shaft .... and yes low stall will
have less slippage so maybe you are in the right range
More i think about it more i think your right. I keep confusing myself. The sensor is on the lower driveshaft. So it is spinning slower then the top one cause its going through the transfercase. In my datalogger is asks for differential ratio.. So i put in 21 whish is my final ratio but when i made a run it said i was spinning either 100mph or 10 mph i forget but it was way off.... So next time i just wrote in 6:80 (my differential ratio) and it would give me numbers like 30mph whitch is about right.
Maybe i'll just call Altronics again and let them walk me through it again.
thanks for the help guys!!
|
|
|
Re: What is good converter slippage?
[Re: ragingram]
#1048695
08/07/11 08:25 PM
08/07/11 08:25 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
More i think about it more i think your right. I keep confusing myself. The sensor is on the lower driveshaft. So it is spinning slower then the top one cause its going through the transfercase. In my datalogger is asks for differential ratio.. So i put in 21 whish is my final ratio but when i made a run it said i was spinning either 100mph or 10 mph i forget but it was way off.... So next time i just wrote in 6:80 (my differential ratio) and it would give me numbers like 30mph whitch is about right. Maybe i'll just call Altronics again and let them walk me through it again. thanks for the help guys!!
I forgot that you are running through a tranfer case
so the ratio would change
|
|
|
Re: What is good converter slippage?
[Re: MR_P_BODY]
#1048696
08/07/11 09:11 PM
08/07/11 09:11 PM
|
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
S/ST 3040
master
|
master
Joined: Jul 2006
Posts: 4,595
On the south side of Nowhere
|
I've never seen pulling truck pull that wasn't throwing clay for 50 ft. It's hard to nail down converter efficiency when the tires are spinning. Big RPM and that much gear reduction is going to show it's fairly efficient. Then add in the tires aren't "hooked". 
|
|
|
Re: What is good converter slippage?
[Re: Sport440]
#1048698
08/07/11 11:28 PM
08/07/11 11:28 PM
|
Joined: Aug 2005
Posts: 759
Southington Ct.
turbobitt
super stock
|
super stock
Joined: Aug 2005
Posts: 759
Southington Ct.
|
Converter slippage numbers can be missleading under certain circumstances. For example, if you at the top of the gear and the car is out of breath, the efficiency numbers will be unuasully high. I would bet your not accelerating near the trap, or way out of gear.
Edit: I am running a PTC converter in a turbo application and hope to get around %4 slippage. This is bassed on similar combinations running the same converter and considered to be extreamly good.
Allan G.
Last edited by turbobitt; 08/07/11 11:32 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
|
|
|
|
|
|
|
