I finally ran a radar gun on my modified mt2.. (t-maxx wheels and modded axles) and the best I can get is 33mph... I ran this before the mod and hit 46 with the os18... everything feels tighter than it did before, so I'm pretty sure thats the problem.. I have to figure out what is binding now... just doesn't have that loose sloppy feeling that the original did..
One thing I noticed is that the engine doesn't seem to scream like it used to... Its not the engine, thats tuned great... I have several and I know how they should sound... It still pulls the fronts off on takeoff then accelerates ok, but not like it used to... it wont shift into 2nd gear no matter what I try.. I didn't loosen the 2nd gear enough to start in 2nd.. I may try that tonight... If thats not the problem, then I guess I'll rip the whole thing apart and check everything again... Any suggestions anyone?[&o]

Doesn't the larger tires change the gearing, could that be it? You are turning quite a bit larger tires too

Tiny

well, if it's not shifting i'm not surprised you are only hitting 33. Remember that if you are using stock gearing, your accel is going to be slower and your top end higher with the larger diameter wheels. If you have tried loosening off the 2 speed screw, you may want to check if you have the clutch in the right way. Also, to check if it's shifting... Just hold it in the air and giver some gas. You will hear and feel the shift for sure.

dustin... have you tried to hold the truck with those monster meats.... the torque rips it out of your hand... I have tried to loosen and tighten the screw and it doesn't make a difference.. I think as a last resort, i'll change the shift mechanism and see if that works... it feels like the others, but I've eliminated everything else.. It may just be the larger tires have changed the ratio to the point where it won't shift... I have gotten it to 2nd gear once, but it started out in 2nd and bogged badly... it did run in the upper 40's on radar, but control was a major issue.
as far as 33 mph.... measured on a bushnel radar gun and its pretty accurate... my gs sut was in the mid 40's, kyosho buggy the same... the clutch is an aluminum one and engages perfect.. will pull the fronts off the ground under acceleration.... I'll try to re-setup tonight and see what happens..

mine has a .28 STS engine, Maxx bowties, 8mm steel shafts.... It still works to check

What ratios are you running?

Oh - and youre sure its not stuck in 2nd? Spring and/or grub-screw gone walkabout?

dustin.. your right, I tried it once but didn't hear any shifting... as far as Poor Judgement... wouldn't it still hit a higher top end with lower acceleration?.. I have great acceleration with lower top speed... unless the motor just can't catch up with the taller tires... remember, I don't run the .28 big block... I have the os 18.... I have the big blocks for my truggy and buggies...

well, if you have tried adjustments to the grub screw, And if you have had this problem since last time you put the tranny together, it is possible that you have the clutch in backwards. OR, the second gear spur could be stripped on the inside where the clutch arm grabs. OR, your engine may not be getting up to the proper RPMs, but generally, like I said, you can get the engien up to full rpms by holding it off the ground and giving it throttle (no resistance).

Yep, but only if the engines making full revs. As Dustin said, try lifting it up and briefly nailing it - see if it shifts.

I cant remember if I got my .18 to shift to 2nd with TMaxx wheels on, I do seem to remember that the 2 speed gave me issues then though. But it wasnt long til I went to the 28 and it was ok after that.

I'll try the grub screw again.....and throttle with the truck in the air... if nothing here, I'll replace the clutch arm...

CEN also has different springs that can be installed in the second gear to change the shift points.




rolland

Aha - nice one Rolland - that was the issue I had with my 2 speed - I was using a spring for a Rally (silver) I think its a black spring for the MT (but Im not 100% on that)

I think you may have found my problem if you ar right... I am using a shift arm from a kit that I picked up cheap... came with gears, bearings, shafts, pinion adn shift arm for less than the spur gears alone... It hasn't been right since I used it... I think it may have the wrong spring rate in there... I don't know the color of the spring, but the spare springs it came with are all silver.I think I'll take it apart and take a look... I still have the original which worked well so it may go back in there.. I haven't had a chance to run it yet, because I'm getting married again next week and lots to do at the moment... (I must be insane)

I think I'm going to scrap the whole 18 thing and possible try and fit a 21 in there... It should be good for about 2.5 hp which is quite a bit more than the os18... If I go this route, I'll be looking for help on how to do this... The engine will be an hpi 21BB or an Orion 21 out of a t-maxx.... I'm leaning towards the hpi because it runs so well... the orion is very tempermental which is why its sitting on the shelf right now... PJ.. your the resident expert on BB's... what do you think?

Silly question to ask me mate! Go for it!

Start off with the BB engine mounts - CT040 wasnt it? I think thats the part number. Then its up to you how you arrange everything on the chassis - theres a few different ways of doing it, especially if you consider using the rear mount battery box.

Biggest issue is getting a .21 sized pipe to fit and link up with the manifold. Other than that, Im pretty much going with digouts setup, its so neat and stock looking, it would be rude not to.

I have an OS T-2030 pipe on order, which is pretty short (comparatively) and theres pics in the Junk Room thread as to how I hope to neaten up my header. The T-2030 comes without a nipple and a 90 degree outlet, so mounting it wonky and backwards isnt an issue. The price isnt so clever though... it should be here in a few days, so Ill spam pics as soon as it arrives - as per normal.

Heres the pipe if youre interested mate - http://www2.towerhobbies.com/cgi-bin...&P=WR&I=LXCC60

Just remember I have moved my rear tie rods to the back of the rear diff casing to give a bit more room.

Apart from the exhaust, you shouldnt have any real issues. People have run 21s and stock trannys with, allegedly, no issues, and you have a few hopped up parts too dont you? So you should be ok mate. Go HPI steel 11/14 and Cen steel 47/44 if you have any issues with the tranny.

Dont forget to start a BB thread so we can all hijack it though!

I decided to hold up the car and see how the shifting was going, its not shifting into 2nd at all.. I've taken it apart several times so I think its the wrong type in there... remember, I purchased a complete trans from who knows what.... I'll try and fit the new one in next week as I'm getting married tomorrow[]..... I will probably still use the BB setup but this is driving me nuts..

yeah, check the spring and make sure the cluch isn't in backwards.

Good luck in the aisle

PS: I love the disgruntled smiley[] right after the words married tomorrow LOL

All kidding aside... she is a great girl... (the wife that is).. the truck always gives me fits... at least it doesn't talk back to me... thats why I got into this hobby..... I have checked the shift/cluch and its in correctly, but another look wouldn't hurt... I think its the wrong unit or spring in there to be honest... after the wedding, I'll take it apart again for the 10th time...

well dustin, I owe you one... I took it apart again for the 11th time and took a good look at the clutch mechanism, I made a noobie mistake.... It appears to be in backwards.. I looked at this thing several times and thought it had to engage at the ledge on 2nd gear, but in actuality, it engages at the rise point... I never thought to look at it this way, I usually just take off the shift mechanism and make sure I put it back the same way.. To verify, I had my friend, a highly skilled nitro junkie look at it, he came to the same conclusion that I did... it was backwards... now, when it stops raining like crazy, I will get a chance to test it out...
By the way, I did get married yesterday and all is great... she even let me tinker with the mt2 this morning and also this evening... got to love that... wait till I ask if I can buy a matrix or nemesis with some of the extra wedding money... Do you think she'll notice?

Aaah we all put that clutch in backwards at some point mate - you were just brave enough to post your mistake though! You just have to remember that the spur picks up the clutch, rather than the clutch picking up the spur - if that makes sense... which it probably doesnt.

As for the wifey - you could try the "We both need our own interests and space" technique. "For the benefit of the marriage."

Just stay out of reach when you suggest it (probably best attempted after sharing a bottle of wine)

To try to avoid reverse clutching it, I have a couple of marks on my clutches that line up with the brake disc tabs, its a sure give away as to which way it goes, without having to use my brain...

Only cen could come up with such a screwed up design.. then I saw the genesis which has 2 pins doing the same thing... Oh well, at least it works when installed correctly....
As for the wife... she lets me use the trucks all the time, its the wrenching during our "together" time that gets her.... she would rather cuddle on the couch and watch a girlie movie.... I'd rather wrench and watch drag racing.... maybe I'll Tivo a movie about female car racing or something like that[:'(]

At least u didnt buy the wrong 2nd gear hub for genesis spurs, even after posting that the part u ordered wouldnt work... goddamnit, I even bought 2 of em, and neither of em will work... obviously...

I did the same thing with the 2nd gear spur on the mt2.... I ordered them without looking at the stock numbers.. thankfully customrccars took them back... i have no idea what they were for but they sent out the correct ones the same day and didn't charge me any postage... got to love those guys.

Lmao - I also got the wrong parts from customrccars mate - and see my other post for the best bit about it.... I dont think Ill be sending them back...