force motor pressure vs tps vs speed

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
drippy
Posts: 49
Joined: Tue Aug 09, 2011 11:55 am
cars: Vk V6
Vy V6

force motor pressure vs tps vs speed

Post by drippy »

ok so my auto is slipping in my VY a bit when i have light throttle but when a 1/4 noise or more its fine

now what i am wondering is what other people are running in there force motor pressure tables? im wanting to increase presure but what is a safe limit to set it to without causing any other issues hardware wise?

i wouldnt mind having full line pressure all the time as my last auto died due to slippage so would like to avoid it with this one... (prob will still kill it :driving: )

ive increased it a little from standard but would really like to know peoples opinions and what works for them before i go upping it too much more

cheers
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DieselBob
Posts: 169
Joined: Sun Mar 28, 2010 7:43 am
cars: Isuzu DMax
Alfa Romeo Guilletta
Location: NSW

Re: force motor pressure vs tps vs speed

Post by DieselBob »

Rough guess is the friction discs/bands are worn....
Best way to check the force motor adjustment is buy a gauge about $30
and get a hydraulic hose, plug them into the test port on the trans and use
that to do the adjustment guessing is messy :)
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The1
Posts: 4852
Joined: Mon Jan 04, 2010 12:23 am

Re: force motor pressure vs tps vs speed

Post by The1 »

You tune it via slip rpm, new clutchs will on average be upto 600rpm, ideally down around 300-400, but some no matter how much pressure wont hold that low as there just worn out.

Here's a ruff guide of tune pressure vs box pressure.

Code: Select all

0psi		65-80psi
6psi		68-93psi
12-18psi	82-130psi	
24-30psi	115-178psi
36-48psi	145-222psi
54-60psi	170-254psi
66psi		190-276psi
72-78psi	210-288psi
84psi		225-300psi
90psi		241-308psi
drippy
Posts: 49
Joined: Tue Aug 09, 2011 11:55 am
cars: Vk V6
Vy V6

Re: force motor pressure vs tps vs speed

Post by drippy »

ok thanks for that info, ill do some logs tomorrow with this box and go from there!

cheers
Jervies
Posts: 199
Joined: Wed Nov 09, 2011 7:35 am
cars: Vt v6 wiith a gt35/40 turbo e85 399rwkw
Mazda e2000 with a cammed vx ecotec motor
Location: Victoria

Re: force motor pressure vs tps vs speed

Post by Jervies »

One of the tunes iv got uses the performance/ "normal mode 2-3-4 gear pressure offset - force motor pressure (psi) vs tps"
Table for increasing the pressure, i think it may be only for the shifts though?
It uses these numbers against the 17 point tps readings
0
10
10
14
18
20
28
29
30
35
43
51
62
78
85
100
110
Those settings on a standard box will make it change like its got a shiftkit
drippy
Posts: 49
Joined: Tue Aug 09, 2011 11:55 am
cars: Vk V6
Vy V6

Re: force motor pressure vs tps vs speed

Post by drippy »

i had a look in the edf but i dont have the offset listed

ive got a vy n/a ecu so does that xdl even have the option in there? if so where coz i must be going blind.. :wtf:
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The1
Posts: 4852
Joined: Mon Jan 04, 2010 12:23 am

Re: force motor pressure vs tps vs speed

Post by The1 »

just tune it via the main tables is much better, than you can actually command more line pressure where it's needed. I use history tables to plot out slip RPM to the same table dimensions as the line pressure table. Or you can use monitor view and table tracing while you go through the graph and bump the pressure up on the cell where it's slipping more, rinse and repeat till tranny slip rpm is <600 preferably.