TMaxx 3.3 lost it's wheelies.

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Tue, 19 Sep 2006 11:36:47



Hi, all.

Once I got the 3.3 broken in (heat cycle) the thing ran like a scalded
bear, rode wheelies until I decided to let it down, etc.

Temps after 2-3 high speed runs were in the 250s or so (ambient temps
around 75).

Revs great, is super fast, decent smoke.  But now wheelies went away.

I think it's because the LSN is too rich, but if I go leaner on it after
a WOT run the idle hangs pretty high for a few seconds while slowing
down (and you can hear the clutch chattering sometimes).

Then I thought maybe the clutch was going out as I noticed it jerking
when using the EZ start.  Took it apart, clutch looked a little worn
(maybe 3 gallons through it now, with just over 1 on the engine) but
nothign serious.  Checked the bearings on the clutch and one was
sticking a little.  Cleaned it up.  Jerking while starting went away.

Still no wheelies.  I do a 15 second idle then JAM and it's like it
stays at a lower RPM for 1-2 seconds while moving then takes off
smoothly and at a pretty even (but fast) rate (no burbling, lean
hesitation, etc, just a flat sound).

Weak clutch spring causing it to engage too early before it hits the
lowend power to take off?  Or maybe I need to go further with the HSN
tuning and revisit LSN?  It's at the point now where it does scream.
Richen it 1/4 turn and you can tell a HUGE difference with a big power
drop and lots more smoke.

Also using pinch test on LSN.  RPMs rise a little and die at 2-3
seconds.  Any leaner and no rise in RPMs during pinch test.  Any richer
and RPMs go up too high before dying (but still 3-4 seconds) and bottom
end seems to get worse.

Have about 3 gallons on the clutch and 1-1.5 on the motor (which still
has great pinch).  Yes, I smoked the rod on my first motor..  :)  I
blame it on the Traxxas break in.. lol

Thanks for any suggestions!

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by kenj » Tue, 19 Sep 2006 11:58:12




Quote:
> Thanks for any suggestions!

slipper clutch?

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Tue, 19 Sep 2006 12:04:26


Quote:



>>Thanks for any suggestions!

> slipper clutch?

Nope, checked that.. it's all good.

When I noticed it wouldn't wheelie as easy any more I retuned from
factory.  Ended up in the same place and still no wheelies.

It just seems the RPMs hang at a lower RPM while taking off..  any
leaner, well, WOT runs end in high hangling idle for a couple seconds,
erraticle idle, etc.  Maybe idle is too high?  It wouldn't even start at
  flush for the LSN until I richened it up.

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by GTD » Tue, 19 Sep 2006 13:57:34


On Sun, 17 Sep 2006 22:04:26 -0500, "Bradley V. Stone"

Quote:




>>>Thanks for any suggestions!

>> slipper clutch?

>Nope, checked that.. it's all good.

>When I noticed it wouldn't wheelie as easy any more I retuned from
>factory.  Ended up in the same place and still no wheelies.

>It just seems the RPMs hang at a lower RPM while taking off..  any
>leaner, well, WOT runs end in high hangling idle for a couple seconds,
>erraticle idle, etc.  Maybe idle is too high?  It wouldn't even start at
>  flush for the LSN until I richened it up.

Just for the sake of being thorough (sp?), Try fattening up the LSN a
little, , ,every motor I have seems to like being a little fatter on
the bottom end than most people reccomend. . .Does the 3.3 use the
same weenie clutch that the 2.5 revo does? I wouldn't expect that to
last too long. . .
 
 
 

TMaxx 3.3 lost it's wheelies.

Post by DanTX » Tue, 19 Sep 2006 18:41:51




Quote:



>>>Thanks for any suggestions!

>> slipper clutch?

> Nope, checked that.. it's all good.

> When I noticed it wouldn't wheelie as easy any more I retuned from
> factory.  Ended up in the same place and still no wheelies.

> It just seems the RPMs hang at a lower RPM while taking off..  any leaner,
> well, WOT runs end in high hangling idle for a couple seconds, erraticle
> idle, etc.  Maybe idle is too high?  It wouldn't even start at flush for
> the LSN until I richened it up.

The*** at flat low revs does sound like a lean low end to me...?

What clutch is it you're running, stock?

--
Dan

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Tue, 19 Sep 2006 21:46:52


Quote:

> On Sun, 17 Sep 2006 22:04:26 -0500, "Bradley V. Stone"




>>>>Thanks for any suggestions!

>>>slipper clutch?

>>Nope, checked that.. it's all good.

>>When I noticed it wouldn't wheelie as easy any more I retuned from
>>factory.  Ended up in the same place and still no wheelies.

>>It just seems the RPMs hang at a lower RPM while taking off..  any
>>leaner, well, WOT runs end in high hangling idle for a couple seconds,
>>erraticle idle, etc.  Maybe idle is too high?  It wouldn't even start at
>> flush for the LSN until I richened it up.

> Just for the sake of being thorough (sp?), Try fattening up the LSN a
> little, , ,every motor I have seems to like being a little fatter on
> the bottom end than most people reccomend. . .Does the 3.3 use the
> same weenie clutch that the 2.5 revo does? I wouldn't expect that to
> last too long. . .

I tried that too.  It seemed to make it even worse, which is why I was
assuming it was lean.  But maybe I didn't go far enough.

I can tell it's too fat on the bottom because when I putt putt around
slowly (1/4 throttle or so) and then stop, idles kick way down and
sometimes it dies.  So if I 'm driving slow I need to clean it out
really quick before coming to a stop.. huge puff of smoke comes out
after that.  :)

Clutch is probably the same as the 2.5 revo.  Not sure.

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Tue, 19 Sep 2006 21:48:17


Quote:






>>>>Thanks for any suggestions!

>>>slipper clutch?

>>Nope, checked that.. it's all good.

>>When I noticed it wouldn't wheelie as easy any more I retuned from
>>factory.  Ended up in the same place and still no wheelies.

>>It just seems the RPMs hang at a lower RPM while taking off..  any leaner,
>>well, WOT runs end in high hangling idle for a couple seconds, erraticle
>>idle, etc.  Maybe idle is too high?  It wouldn't even start at flush for
>>the LSN until I richened it up.

> The*** at flat low revs does sound like a lean low end to me...?

> What clutch is it you're running, stock?

Yep, clutch is stock.  I've tried richening.. seems to get worse and
causes stalling after low speed runs (flameouts).

I think these motors need more than 2 adjustments.  :)

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by DanTX » Tue, 19 Sep 2006 22:09:27




Quote:






>>>>>Thanks for any suggestions!

>>>>slipper clutch?

>>>Nope, checked that.. it's all good.

>>>When I noticed it wouldn't wheelie as easy any more I retuned from
>>>factory.  Ended up in the same place and still no wheelies.

>>>It just seems the RPMs hang at a lower RPM while taking off..  any
>>>leaner, well, WOT runs end in high hangling idle for a couple seconds,
>>>erraticle idle, etc.  Maybe idle is too high?  It wouldn't even start at
>>>flush for the LSN until I richened it up.

>> The*** at flat low revs does sound like a lean low end to me...?

>> What clutch is it you're running, stock?

> Yep, clutch is stock.  I've tried richening.. seems to get worse and
> causes stalling after low speed runs (flameouts).

> I think these motors need more than 2 adjustments.  :)

Any chance the clutch has been overheating and is glazed?

--
Dan - on his PC

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Tue, 19 Sep 2006 22:19:16


  > Any chance the clutch has been overheating and is glazed?

I gave it a light sanding when I checked it out.  Didn't look glazed,
but a little scuffing never hurts.

One thing I did notice is in a couple spots the material was worn down
to almost the level of the spring.

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by DanTX » Wed, 20 Sep 2006 01:06:43




Quote:

>  > Any chance the clutch has been overheating and is glazed?

> I gave it a light sanding when I checked it out.  Didn't look glazed, but
> a little scuffing never hurts.

> One thing I did notice is in a couple spots the material was worn down to
> almost the level of the spring.

Those spots are pretty much the only places those clutches engage - same as
the one in my Revo.  That means it's pretty worn, maybe take this
opportunity to upgrade to the 3 shoe setup - as IMHO the stock clutch is a
bit limp anyway...

--
Dan - on his PC

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Wed, 20 Sep 2006 02:12:29


Quote:




>> > Any chance the clutch has been overheating and is glazed?

>>I gave it a light sanding when I checked it out.  Didn't look glazed, but
>>a little scuffing never hurts.

>>One thing I did notice is in a couple spots the material was worn down to
>>almost the level of the spring.

> Those spots are pretty much the only places those clutches engage - same as
> the one in my Revo.  That means it's pretty worn, maybe take this
> opportunity to upgrade to the 3 shoe setup - as IMHO the stock clutch is a
> bit limp anyway...

Where do I get the 3 shoe setup?  And what if I flipped the shoes for
now so they are the opposite facing way?  I hear that makes them engage
later and I may get a few more tanks out of them.

Thanks.

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by DanTX » Wed, 20 Sep 2006 02:29:45




Quote:




>>> > Any chance the clutch has been overheating and is glazed?

>>>I gave it a light sanding when I checked it out.  Didn't look glazed, but
>>>a little scuffing never hurts.

>>>One thing I did notice is in a couple spots the material was worn down to
>>>almost the level of the spring.

>> Those spots are pretty much the only places those clutches engage - same
>> as the one in my Revo.  That means it's pretty worn, maybe take this
>> opportunity to upgrade to the 3 shoe setup - as IMHO the stock clutch is
>> a bit limp anyway...

> Where do I get the 3 shoe setup?  And what if I flipped the shoes for now
> so they are the opposite facing way?  I hear that makes them engage later
> and I may get a few more tanks out of them.

> Thanks.

Hmm dunno, don't have much experience of these types of clutch - the 3 shoe
setup is a Traxxas optional hopup though IIRC, so it can't be that hard to
find, Tower probably sells it.

--
Dan

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by \ » Wed, 20 Sep 2006 05:59:34




Quote:
> Hi, all.

> Once I got the 3.3 broken in (heat cycle) the thing ran like a scalded
> bear, rode wheelies until I decided to let it down, etc.

> Temps after 2-3 high speed runs were in the 250s or so (ambient temps
> around 75).

> Revs great, is super fast, decent smoke.  But now wheelies went away.

> I think it's because the LSN is too rich, but if I go leaner on it after a
> WOT run the idle hangs pretty high for a few seconds while slowing down
> (and you can hear the clutch chattering sometimes).

> Then I thought maybe the clutch was going out as I noticed it jerking when
> using the EZ start.  Took it apart, clutch looked a little worn (maybe 3
> gallons through it now, with just over 1 on the engine) but nothign
> serious.  Checked the bearings on the clutch and one was sticking a
> little.  Cleaned it up.  Jerking while starting went away.

> Still no wheelies.  I do a 15 second idle then JAM and it's like it stays
> at a lower RPM for 1-2 seconds while moving then takes off smoothly and at
> a pretty even (but fast) rate (no burbling, lean hesitation, etc, just a
> flat sound).

> Weak clutch spring causing it to engage too early before it hits the
> lowend power to take off?  Or maybe I need to go further with the HSN
> tuning and revisit LSN?  It's at the point now where it does scream.
> Richen it 1/4 turn and you can tell a HUGE difference with a big power
> drop and lots more smoke.

> Also using pinch test on LSN.  RPMs rise a little and die at 2-3 seconds.
> Any leaner and no rise in RPMs during pinch test.  Any richer and RPMs go
> up too high before dying (but still 3-4 seconds) and bottom end seems to
> get worse.

> Have about 3 gallons on the clutch and 1-1.5 on the motor (which still has
> great pinch).  Yes, I smoked the rod on my first motor..  :)  I blame it
> on the Traxxas break in.. lol

> Thanks for any suggestions!

Have you checked for exhaust header and coupler leaks?
Checked/Replaced the fuel hoses?
Checked the fuel filter?
Changed the glow plug to something a bit hotter?
Verified that the slide is opening all the way when you pull the trigger?
Perhaps bought a bad batch of fuel?
Checked the driveline for binding?
Checked the brakes to make sure they ain't dragging?
Checked the air filter to see if it's excessively dirty?

It really <sounds> like a slight lean bog, but if richening the LSN and/or
HSN didn't help matters, it ain't that.

It sounds like you know what you're doing and that you've tried all of the
common sources of this problem.  I doubt it's the clutch as others have
suggested as a worn clutch causes RPM to increase d/t slippage rather than
decrease RPM, but hey, you never know!

HTH,

Doc

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by Bradley V. Ston » Wed, 20 Sep 2006 09:07:29


Quote:



>>Hi, all.

>>Once I got the 3.3 broken in (heat cycle) the thing ran like a scalded
>>bear, rode wheelies until I decided to let it down, etc.

>>Temps after 2-3 high speed runs were in the 250s or so (ambient temps
>>around 75).

>>Revs great, is super fast, decent smoke.  But now wheelies went away.

>>I think it's because the LSN is too rich, but if I go leaner on it after a
>>WOT run the idle hangs pretty high for a few seconds while slowing down
>>(and you can hear the clutch chattering sometimes).

>>Then I thought maybe the clutch was going out as I noticed it jerking when
>>using the EZ start.  Took it apart, clutch looked a little worn (maybe 3
>>gallons through it now, with just over 1 on the engine) but nothign
>>serious.  Checked the bearings on the clutch and one was sticking a
>>little.  Cleaned it up.  Jerking while starting went away.

>>Still no wheelies.  I do a 15 second idle then JAM and it's like it stays
>>at a lower RPM for 1-2 seconds while moving then takes off smoothly and at
>>a pretty even (but fast) rate (no burbling, lean hesitation, etc, just a
>>flat sound).

>>Weak clutch spring causing it to engage too early before it hits the
>>lowend power to take off?  Or maybe I need to go further with the HSN
>>tuning and revisit LSN?  It's at the point now where it does scream.
>>Richen it 1/4 turn and you can tell a HUGE difference with a big power
>>drop and lots more smoke.

>>Also using pinch test on LSN.  RPMs rise a little and die at 2-3 seconds.
>>Any leaner and no rise in RPMs during pinch test.  Any richer and RPMs go
>>up too high before dying (but still 3-4 seconds) and bottom end seems to
>>get worse.

>>Have about 3 gallons on the clutch and 1-1.5 on the motor (which still has
>>great pinch).  Yes, I smoked the rod on my first motor..  :)  I blame it
>>on the Traxxas break in.. lol

>>Thanks for any suggestions!

> Have you checked for exhaust header and coupler leaks?
> Checked/Replaced the fuel hoses?
> Checked the fuel filter?
> Changed the glow plug to something a bit hotter?
> Verified that the slide is opening all the way when you pull the trigger?
> Perhaps bought a bad batch of fuel?
> Checked the driveline for binding?
> Checked the brakes to make sure they ain't dragging?
> Checked the air filter to see if it's excessively dirty?

Yep, checked all that.  The only other change made was adding RDLogics
driveline shafts.  Now, this COULD be the problem but IIRC it started
happening before this.

Seems to roll just fine.  Brake are adjusted (were too loose before and
disc fell off causing a front flip), no leaks, etc.

I may try just richening up the LSN a little more to see how much worse
it may get.  But, pinch test tells me that it's getting rich even with
1-2 hours richer.  So does drivability.

It's already at least a turn out past flush... I know all machines are
different, but this is my 2nd 3.3 and never would it even run at flush
(too lean).  Richer than I have now, drive around slowly and it bogs
pretty bad and if it dies, starting it is like restarting after killing
it by plugging the exhaust.. a little hard.  Vs. starting it after a
pinch test where it starts right back up in a millisecond with EZ Start.

Quote:

> It really <sounds> like a slight lean bog, but if richening the LSN and/or
> HSN didn't help matters, it ain't that.

The best way to describe the sound is "riding the clutch" on a dirt
bike.  The sound itself doesn't tell me rich or lean (no
crackling/hesitation or bogging/4 stroking).

Quote:

> It sounds like you know what you're doing and that you've tried all of the
> common sources of this problem.  I doubt it's the clutch as others have
> suggested as a worn clutch causes RPM to increase d/t slippage rather than
> decrease RPM, but hey, you never know!

That's what I've found with these little ***s.  You never know.  :)
Tuned bikes and quads for years and this proved similar, but something
like this baffles me a bit and process of elimination starts up.  :)

- Show quoted text -

Quote:

> HTH,

> Doc

 
 
 

TMaxx 3.3 lost it's wheelies.

Post by DanTX » Wed, 20 Sep 2006 09:29:08




Quote:

>> It sounds like you know what you're doing and that you've tried all of
>> the common sources of this problem.  I doubt it's the clutch as others
>> have suggested as a worn clutch causes RPM to increase d/t slippage
>> rather than decrease RPM, but hey, you never know!

> That's what I've found with these little ***s.  You never know.  :)
> Tuned bikes and quads for years and this proved similar, but something
> like this baffles me a bit and process of elimination starts up.  :)

Oh man you wouldn't *beleive* the amount of times we've just had issues
appear for no visible reason, only to completely clear up after the next
run!  With the 3.3 I'd be tempted to go for the clutch upgrade anyway you
know, I actually thought Traxxas did one as a hopup, but it appears I might
have been talking out of my ass as I can't find it anywhere on the website
:)  Although, I did notice you can now get red adonised alu wheels with real
*** tyres for your wheelie bar haha :-D

The stock clutches are cheap enough to change one out just to see if it
makes a difference I reckon, also, tighten the slipper clutch up a bit more
(I've never been a fan of this backing off a quarter turn malarky).

Oh BTW, have you changed your suspension setup at all?

--
Dan - on his PC