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FAST Transmission Controller
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=40794		 Page 1 of 1
Author:  tulsa [ Sun Mar 01, 2009 9:00 pm ]
Post subject:  FAST Transmission Controller
Has anyone looked at the Fast transmission controller for the 545RFE? I made several searches and could not find a reference.
Here is a link:

http://www.fuelairspark.com/Products/de ... nefits.asp

Lewis
Author:  KJ 119 [ Sun Mar 01, 2009 9:36 pm ]
Post subject: 
Interesting. :idea:
Author:  gmctd [ Sun Mar 01, 2009 10:37 pm ]
Post subject: 
That's just a remarketer for the PCS standalone TCU - is useable but not useable in the KJ unless the Export-only manual transmission ECM has been installed
Author:  RTStabler51 [ Mon Mar 02, 2009 4:10 am ]
Post subject: 
gmctd wrote:
That's just a remarketer for the PCS standalone TCU - is useable but not useable in the KJ unless the Export-only manual transmission ECM has been installed
And how hard is that?!? I'd figure the sourcing is the hardest part.
Author:  DOC4444 [ Mon Mar 02, 2009 10:59 am ]
Post subject: 
GMCTD,

So am I correct in assuming that you have already gone down that road in search of the F37 "fix" and hit a dead end?

Or, have you already figured how to get a euro spec manual ECM to integrate into a US spec, auto CRD and work with a FAST module?


BTW, I'm not sure an F37'd TCM (like mine) is really a major downer when you are running an InMotion Stage II ECM and even less so if combined with a Suncoast TC.

What do you think?


DOC
Author:  gmctd [ Mon Mar 02, 2009 9:12 pm ]
Post subject: 
Not yet at the end of the road, but going down it - F37 was to reduce engine torque in order to protect the plastic stator and weak TCC clutch

- the torque convertor impeller is driven by the crankshaft - the turbine, connected to the 545 input shaft, is driven by fluid coupling at somewhat less than 1:1 engine torque input - the lower the stall speed the greater the hydraulic coupling - the stator converts 1:1 torque to ~2.1:1 torque when the impeller spins faster than the turbine, which may be stopped as at takeoff, and continues to function until turbine speed matches impeller speed as vehicle speed increases - the stator then freewheels on it's sprag clutch - thus the stator is under considerable strain from dead stopped up thru ~3rd gear, even moreso when towing or during event of rapid acceleration - a turboDiesel engine produces max torque in that range between idle and ~2krpm, most ~1500-1700

- additionally, due to that down-lo torque band, a Diesel engine will slip a TCC that a gasser (patooie!) couldn't possibly slip, as their torque band is up ~3krpm - greater power can be input thru a clutch at high rpm than at low rpm due to inertia - thus the F37 syndrome - therefore the Transgo resistor would likely be death to the oem TC plastic stator, even if it helped some in reducing TCC slip - definitely would not recommend installing the resistor pre-Suncoast - F37 was created to reduce engine power in order to compensate for a weak TC and C

The Export TCM for manual transmissions is not looking for presence or input from a TCM, as is our homeland version - therefore, the TCU from PCS could be utilized to control the 545RFE without alarming the ECM, BCM, SKREEM, etc, in any way - I have looked into that, as well as for my 68RFE for installation into older Dodges as replacement for the 47\48Rx, an early '60's Torqflyte 727 with TCC and tacked-on overdrive

INMOTION is no challenge for the Suncoast Hemi TCC, as installable in our CRD KJ - but, yeah, INMOTION does (over-)compensate for F37

The added Transgo pressure-compensation resistor results in increased line-pressure, which should cause firmer shifts and TCC apply, which it does, for a while - TCM will eventually "learn" to un-compensate, as similar happens when a towed trailer is removed: TCM had increased line pressure to facilitate towing, which then must be reduced to normal when not towing - in that interval the 545 shifts rather firmly for a while as TCM "learns" to reduce pressure

What I noticed, having installed a switch to connect and disconnect the resistor, was that the 2nd-3rd shift was highly disturbing if the resistor was switched-in during normal acceleration event - the other shifting was firmer than normal, but nothing like the 2nd-3rd shift - turns out TCM holds the trans in 1-2-3-4 until after 2-3-4-5 is engaged, to protect the blue-haired granny's dentures - for some reason, 2-3 is worse than the other ranges - the resistor amplifies the hold-release symptom in normal acceleration take-offs, such that the KJ actually slows down during the 2-3 transition if slowly accelerating - it's just a harsher shift when rapidly accelerating - therefore, I switch the resistor out during normal operation, switching it in during testing - never give TCM an even break, I allus sez...................
Author:  tulsa [ Tue Mar 03, 2009 9:18 am ]
Post subject: 
gmctd,
I saw a post a couple of months ago that indicated the poster, on another forum, had missed an electrical connection to the transmission and the result was that the US ECU assumed that the transmission was a manual without this electrical feed back. I assumed the result would be some form of power limp in, but that was not mentioned.
Lewis
Author:  gmctd [ Tue Mar 03, 2009 12:05 pm ]
Post subject: 
One event for a CRD with 6sp manual happened on this forum, another similar event for the 545RFE on the Jeep forum, both cases resulting from a low-battery jump-start, both cases resulting in DTC for incorrect transmission type - ECM is flashed for either auto or manual service - the manual ECM would not care if the trans was auto with standalone controller, as there is no manual TCM on the CAN intranet - dunno what could happen with the auto ECM over a period of time, but the constant unclearable CEL would disguise a real event, resulting in possible damage to your engine - additionally, the vehicle would never pass DOT inspection which requires CEL to be off, be functional, and respond to testing during inspection - DCJ is likely prohibited from selling the non-US emissions-compatible ECM within congress\EPA jurisdiction, but, hopefully, Hillary is making some fast friends in other places on other soils :roll: (with millions of critically-depressed US economy dollars) :shock: so maybe there is hope............... :cry:
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