Dyna Storm Funny Noises

[DaveG28]

Hi All,

Not sure anyone here has run a dyna storm, but I have 2, and both have a lot of slip under acceleration and make a horrible noise when accelerating for the first couple of minutes of each race. Anyone have any idea if this will be the funny slipper clutch, or a knackered diff?

[A.J. Gee]

It sounds to me like your gears are not meshing correctly. Have you taken a look at your pinion gear(The gear attached to the motor)?You might have it too close to your spur gear. Thats my best guess right now. Check that out and maybe make an adjustment.

[94eg!]

First thing would be to check spur/pinion mesh like Tamiya Slave suggested. The Dyna Storm uses 0.4 module gears, so the mesh is much more difficult to set than most Tamiyas (that have 0.6 module). On the packages of 0.4 pinion sets, they suggest using a piece of plastic bag (thin plastic grocery bag I guess) between the gears to set mesh. You simply press the pinion hard against the spur with the plastic between them & tighten the motor screws. Then you just roll the plastic out from between the gears, and the running clearance should be just right. I remember doing this once and it worked well. I have since just used my eyes & ears to set the running clearance.

Also make sure the grub screw in the pinion hasn't come loose.

If the gears check out, the next thing would be to check the diff. Here's how:

- remove spur gear cover
- hold spur gear & nearest rear tire steady with one hand
- turn the other wheel with your other hand to make the drivetrain slip
- observe the adjuster nut on the end of the MDC during slip
- if the nut is turning while you hold the spur steady, your diff is good
- if the nut does not turn, you need to tighten or rebuild your diff.

Moral: The MDC should always slip well before the diff...

If the diff checks out good, the noise could be the clutch plates in the MDC are worn. You'll will have to remove the clutch housing cover & check them out. It's probably best to observe the correct order and direction that the 7 disc plates are in so you can put them back exactly how they were before. This will keep like surfaces matched up.

[DaveG28]

The slipper is a beeatch on the Dyna, never seen anything so complicated.

I don;t think it can be the pinion mesh, as it is slipping, and the pinion would either come loose or not, rather than slip slightly under acceleration?

I will try the diff, although I have two with diff's in totally different conditions (one knackered and knochy, one smooth and recently built) and both cars have problems, so I guess the best bet is chuck a spare set of clutch plates I have in and try that?

The only thing with it being the slipper, I have tried tightening this to solve the problem and it doesn't?

Dave

[stefke]

The few things I can remember of running my Dynastorm, were indeed that the slipper was overcomplicated but more importantly that It understeered so badly I reverted back to my trusty old Super Astute.

The Dynastorm was the car that ended my Tamiya "carreer". I bought a Losi XX and only reverted back to Tamiya when the TRF501X came out.

[DaveG28]

Stefke,

You've just had a 501x worlds from Champ haven't you? Are the instructions in English, they are sending me a trf416 at the moment (just released) and I forgot to check about the instructions!?

Dave

PS I've actually always found the handling ok on the Dyna myself by shortening and hardening the suspension (only used it indoors), but its very heavy and I can't get the dampers from it to work properly at all!!

Its also not as strong as modern cars, looking at the steering knuckles etc.

DAve

[stefke]

Originally Posted by DaveG28

Stefke,

You've just had a 501x worlds from Champ haven't you? Are the instructions in English, they are sending me a trf416 at the moment (just released) and I forgot to check about the instructions!?

Dave

PS I've actually always found the handling ok on the Dyna myself by shortening and hardening the suspension (only used it indoors), but its very heavy and I can't get the dampers from it to work properly at all!!

Its also not as strong as modern cars, looking at the steering knuckles etc.

DAve

The WE has the original 501X manual with an addendum manual for the WE's modifications, all in english. Don't know about the TRF416.

The Dynastorm was heavy indeed. I lightened it with a CF chassis and other CF parts, Ti turnbuckles and Ti screws. But all of this made the car understeer even more so I had to add a ridiculous amount of lead (50-75g or so) on the front bulkhead to get some pressure on the front drivetrain, thus neutralising all my weight savings .
They just got the weight distribution on that car plain WRONG.

The amount of pack of the original shocks was to little to make them effective and other shock pistons weren't really available at the time, so I ended up using the older HiCap shocks from my Super Astute instead (BTW, those are still some of the best shocks EVER).
Still, the car was 1 sec. a lap slower compared to my by then dialed Super Astute.

[DCM]

if it is slipping, then the two obvious things to look at are the diff and slipper, easiest thing to do is pull the gear cover off, hold the two wheels still and try to rotate the spur with your thumb, if it moves and the layshaft stays still, tighten the slipper, if the layshaft turns then it is the diff.

Depending how long you been running it, it mught just be as easy to pull the box apart and rebuild (yes, I know the slipper is a little minx to do....)

[94eg!]

Strange, my Dyna Storm re-release is an oversteer monster on the local indoor dirt track with anything but fresh OEM tires. When the original tires are new, the car travels nice & straight and balanced, but once those front ribs wear down, I can't keep the car pointed forward to save my life.

Granted I have NO racing experience whatsoever, so I cannot comment on weight distribution or damper pack or setup. I run with kit instruction settings.

[pUs]

Originally Posted by DaveG28

Hi All,

Not sure anyone here has run a dyna storm, but I have 2, and both have a lot of slip under acceleration and make a horrible noise when accelerating for the first couple of minutes of each race. Anyone have any idea if this will be the funny slipper clutch, or a knackered diff?

I had one of these back in late 1992, when they first came out.

I remember my Dyna storm made a lot of noises the first time we tried it indoors, and at that time, it was the diff that wasn't tightened enough. However, it sounded as the MDC made the noise, really weird. Anyway, as soon as we set the diff with no slip (still it should be smooth though) the noise dissappeared and the MDC worked as it should.

Also, I have no idea how you make the Dyna understeer. For me, it was the opposite. Always plenty of steering.. =) but of course, that was in 1993, the tires available today are a bit better..

[stefke]

Originally Posted by pUs

Also, I have no idea how you make the Dyna understeer. For me, it was the opposite. Always plenty of steering.. =) but of course, that was in 1993, the tires available today are a bit better..

Try running on dirt.

Or compare onpower steering with contemporary 2wd's like the XX or the Cougar 2000. I lost 2 car lengths coming out of every turn. It was so bad, I went back to the Super Astute for a couple of races.

[pUs]

Originally Posted by stefke

Try running on dirt.

Or compare onpower steering with contemporary 2wd's like the XX or the Cougar 2000. I lost 2 car lengths coming out of every turn. It was so bad, I went back to the Super Astute for a couple of races.

Uhm.. I dd? Really, what kind of comment is that? I actually did a lot of running on hard packed dirt tracks during 1993 with that car. The car felt good and very nicely balanced (for me at least) on grass and carpet.

Never mind, I just tried to help..