Manual Valve Body guys, need sanity check...
04-10-2006, 03:15 PM
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Manual Valve Body guys, need sanity check... Ok, I put a Rossler Terminator II TH350, RMVB Trans with ATI 4,000 stall TC. I have taken note of the things since driving it:
1st gear seems to have some sort of over run protection on it. I can go say 15mph, let off the throttle, and then if I ease the throttle back in its almost like being in neutral until it reaches the amount needed to exceed coasting speed.
Next, I shift into second and its right now, yet still smooth. I contribute this to being under a load basically. However, if I am just putting about and shift into 3rd without being under the pedal, it makes a hella thunk, like the U joints are shot or the rearend isnt bolted in too well (FWIW, I have had new U Joints and put in a 9" rearend and still same thing). Under throttle/heavy load and racing 3rd just snaps right into gear like any other car would, maybe slightly quicker.
Along that, is downshifting...if I coast to slow roll and shift from 3rd to 2nd (or even pass it and go to 1st) the rear makes another thunking noise like its about to fall out. If I stop, and shift from 3rd to 2nd and into 1st, its fine, nothing unusual. I think thats just the way it is based off load required vs lack of smooth automatic engaging clutch packs etc..
Charlie
1st gear seems to have some sort of over run protection on it. I can go say 15mph, let off the throttle, and then if I ease the throttle back in its almost like being in neutral until it reaches the amount needed to exceed coasting speed.
Next, I shift into second and its right now, yet still smooth. I contribute this to being under a load basically. However, if I am just putting about and shift into 3rd without being under the pedal, it makes a hella thunk, like the U joints are shot or the rearend isnt bolted in too well (FWIW, I have had new U Joints and put in a 9" rearend and still same thing). Under throttle/heavy load and racing 3rd just snaps right into gear like any other car would, maybe slightly quicker.
Along that, is downshifting...if I coast to slow roll and shift from 3rd to 2nd (or even pass it and go to 1st) the rear makes another thunking noise like its about to fall out. If I stop, and shift from 3rd to 2nd and into 1st, its fine, nothing unusual. I think thats just the way it is based off load required vs lack of smooth automatic engaging clutch packs etc..
Charlie
04-10-2006, 04:35 PM
#2
I don' tthink that you are supposed to downshift a man. valvebody transmission unelss you are at a complete stop.... maybe i"m wrong though. A manual valvebody with a transbrake, doesn't have any compression braking so to speak, so when you let off the engine will not slow the car down at all. That's probably why when you are cruising in 1st and slow some, the engine needs to be brought back up to speed before it will do anything, the engine has to catch up the freewheeling transmission. Hope this is right and makes sense.
04-10-2006, 05:08 PM
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Very similar to my Rossler t400. There is no compression braking in 1st or 2nd gear. That's the frewheeling you're feeling....also magnifies the backlash in the rear since it unloads the rear and reloads it quickly when you shift....downshifting is fine as long as you match road speed/rpm to the gear you're shifting to.
04-10-2006, 05:28 PM
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That makes me feel much much better....didnt worry about it as much after install, but for some reason all the little things have been a "?" lately. Thanks.
04-10-2006, 11:38 PM
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SUX, I appreciate the info, and want to clarify that I dont freewheel, I just happened to take note of all the things I was experiencing and wanted to know that its all "normal" or not. Thanks.
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04-11-2006, 12:13 AM
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When you keep the car in say first, you stay on the throttle to 20mph, then let off the throttle, the freewheeling acts like the car is in neutral and will idle down even though your coasting at 20, 19, 18, etc....until it reaches the threshold rpm/speed and is "engaged" again. Or, if your cruising on the highway, as you coast you throw it into 1st real quick and it will just idle down, same thing.
04-11-2006, 01:34 AM
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Originally Posted by onfire
Very similar to my Rossler t400. There is no compression braking in 1st or 2nd gear. That's the frewheeling you're feeling....also magnifies the backlash in the rear since it unloads the rear and reloads it quickly when you shift....downshifting is fine as long as you match road speed/rpm to the gear you're shifting to.
Say I am cruising along about 40 in 3rd and someone comes up beside me and wants to play, I can downshift and punch it right?
Or I take off shift to second and then I need to stop real quick, do I go ahead and shift to 3rd and come to a stop?
I will be getting used to the RMVB myself real soon.
04-11-2006, 01:46 AM
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Why is "freewheeling" so bad on the trans? If the trans acts as though it's in neutral until you match the engine rpm, what does it hurt to coast like that. I could see why it would be bad if you were turning 4,000 rpm's let it idle down by coasting and then just stabbed the throttle.....I'm glad I read this, I am putting my RMVB 400 in soon and I've never heard anything about this.
04-11-2006, 02:04 AM
#13
Originally Posted by Daniel_z28
Why is "freewheeling" so bad on the trans? If the trans acts as though it's in neutral until you match the engine rpm, what does it hurt to coast like that. I could see why it would be bad if you were turning 4,000 rpm's let it idle down by coasting and then just stabbed the throttle.....I'm glad I read this, I am putting my RMVB 400 in soon and I've never heard anything about this.
04-11-2006, 07:45 AM
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Originally Posted by revtime
Ok so I can downshift to second as long as I keep the revs up?
Say I am cruising along about 40 in 3rd and someone comes up beside me and wants to play, I can downshift and punch it right?
Or I take off shift to second and then I need to stop real quick, do I go ahead and shift to 3rd and come to a stop?
I will be getting used to the RMVB myself real soon.
Say I am cruising along about 40 in 3rd and someone comes up beside me and wants to play, I can downshift and punch it right?
Or I take off shift to second and then I need to stop real quick, do I go ahead and shift to 3rd and come to a stop?
I will be getting used to the RMVB myself real soon.
No problems doing that with a Rossler trans. Not all RMVB are alike though. Just don't shift into second or first at a speed that will over rev the engine....like going to second from third at 100mph.
04-11-2006, 10:39 AM
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Originally Posted by NOSjohn
FREEWHEELING ??? Are you guys making up terms? 
...oh lord, I need to go to bed.
...oh lord, I need to go to bed.And looking way back at post #2, JL-WS6, yes the trans does slow the car down when off the throttle, or compression brake, like a normal trans does.