posted
I have had the 323 in my revo for about 3 gallons. The motor is absolutly incredible!!!!! Wheelies at any time in first gear. But...... I have had the problem of it richening up and quitting when I turn left. I can do hundreds of circles turning right and nothing happens to the tuning. As soon as I make one sharp left turn and hammer the throttle it shuts down. This only happens when the tank is half or less than half full. Last week I got the tekno conversion kit and one of the recommended tanks and still had the same problem. I took it to my LHS (extreme r/c) and me and three of the pro's tried many options. We tried adding more fuel line to the return, we tried shortening the fuel line, we tried adding to the fuel line a fuel filter. Each option we tried all had the same result, turn left then it dies. The last thing we tried was putting the stock exaust back on. This worked but takes alot of power from the motor. It is quieter and less powerful. Just a couple reasons why I bought the rb323tm. Sound and performance, I should not have to use a different exaust than what comes with the motor, should I? Please get me over this problem so I can go back and whoop up on the stock boys.
Posts: 4 | Registered: Aug 2006
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posted
I am afraid that this problem is related to the position of the tank in the REVO, you will notice that when you turn left and the engine stops that there is no fuel or there are air-bubbles in your fuel-line. When the engine does not get enough fuel, then it will stop and die on you.
There are some other topics on this forum which treat the same problem and for some the problem dissapeared.
posted
you know i have sat here and read a whole lot of people saying that it is the positioning of the tank... but it works with teh stock set up and with other engines but if you look at the problem you have to look at if you have the stock exhaust or a free low exhaust... now that is where i believe the problem is.. like homeister i too have seen it where i would put teh stock exhaust back on and it would work like a charm.... so saying that the position of the tank is a problem is just wrong...... now i would like to suggest to anyone here to try and use the dual chamber pipe that was released by RB and see if you have the same problem... but as far as i see it if something is sold as a direct drop in the only mods that should be made is to the linkages of the throttle and brake.... this is IMO
Posts: 215 | From: usa | Registered: Apr 2006
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posted
It still IS a problem rooted in the side to side placement of the tank and engine in the revo. True, extra tank pressure from a more restrictive exhaust may help, but that would not be needed if the tank was in front of the engine, as opposed to beside it. The way the revo is arranged, when you turn left, the centrifugal force pulls the fuel AWAY from the engine, and a right turn does the opposite. A more restricive exhause will only hide the problem, and likely reduce power.
Posts: 70 | From: Seward, Alaska | Registered: Mar 2006
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posted
I can't argue with any of these statements that you all have made. I can totally understand that when aftermarket parts are installed on other brands that problems may arise. I have no problems adjusting and tuning for these situations but I do not know how to resolve this issue. I have spent about $80 taking advise of many forums and posts but still have the problem. I believe Rody when he states that the fuel tank is in the wrong position with the usage of this motor. That is a fact and has been proven by many 323 users. I have not seen a guaranteed fix put into place for this yet. I am looking for a 100% reduction of the "left turn" problem. Is a conversion kit that puts the tank infront or behind the motor the answer? Is there a better exhaust to run with the 323/revo combo? I do not know. I am desparatly searching for that answer. The revo with that motor is absolutely amazing but if you can use only 45cc of fuel before you have to fill up again to avoid the problem, it takes the fun out of being the fastest. I know I am not the only frustrated fella out there with this issue. Help my get my revo running again.........
Posts: 4 | Registered: Aug 2006
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posted
well man... i have to say the design works for many other engines... in cluded big blocks that people have ran with there 1/8scale pipes which i might say happen to be dual chamber.... also the problem is not tank placement is using the right pipe for it to work... even on 1/8 scale buggys some pipes will give bubbles in fuel line causing eratic running... and you just change the pipe and bubbles are gone... is that a placement of tank issue to.... just food for thought.... just saying the guys at traxxas are engineers also so i am just giving them the benefit of the doubt that they did there R&D, seeing that it is easily the best monster truck out there on the track.... i just can't bash other peoples work with out first looking at all the possibilities.... if i was to say that then you have to ask the question did RB did the R&D on the revo with this engine... if so how come they did not encounter this problem.... i buy RB engines all the time they are the best... so i am not bashing just saying... if you wanna speak of some else design look at all factors
Posts: 215 | From: usa | Registered: Apr 2006
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posted
I fully understand. If I had a brand new pipe from RB would that solve my problem? I do not know. I do not know how to contact RB and discuss my problem with them. Is there a customer service number? I am not bashing RB's products either but I want my tm323 to run like it is supposed to. I don't think I am asking too much. I will pay for upgrades or add ons or whatever I have to do to get it better. I just don't want any more guessing.
Posts: 4 | Registered: Aug 2006
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posted
this is the pipe that RB makes for it... i never tried it b4 so i can't swear for it.... its only $25.00.... http://www.acehardwarehobbies.com/2.2/catalog/product_info.php?cPath=1_6_483_410&products_id=14600&osCsid=da88ac3d5bdc390ac1401cd1e7c196c0 .... let me know if this works.... i have since gone to smaller engines to race with and its been a blast plus my fuel economy is just great... i run both big block and small block with my engine... and my only problem is driving skills but i am easily the fastest truck out there on the track.. let me know if this works...
Posts: 215 | From: usa | Registered: Apr 2006
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posted
That looks like the pipe that came with my 323 but it has a different number........ Is this a new improved pipe? The pipe that came with my motor is the same one that is on the advertisement on RB home page. My pipe number is TM/RV-01. Is there a difference between my pipe and the pipe on kgombe's post? $25 is a cheap fix but if the pipe that was originally sold with my motor doesn't work right I need to send it back and get some reimbursments for the things I have purchased to correct the problem. How can I speak to someone from RB? Is there a phone number or just the email? Rody ...help me out....get me running again.
posted
I'm currently runing the RB 523 with the teckno upgraded gas tank. (HPI vesion) I'm using the stock exhaust that came with the motor. I use to have the same issue but with this set up I can turn circles in both directions with out shuting down the motor.
-------------------- "Put the peddle to the metal "RBWSII,RB523,RBC6BB(2), RB928 Revo 3.3, XTM 1/8 Buggy, Jammin Truggy, Jato,XB5R BUGGY Posts: 46 | From: Northern California | Registered: Feb 2006
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posted
The fact still arises, that when you have a vehicle where the fuel has to travel from left to right of vice-versa to get from the tank to the carb, you get turn leaning issues. Yes, you can combat this with a more resrictive pipe, which works because it provides more tank pressure, negating any difference in fuel pressure at the carb between left and right turn. If you find a pipe that does that and still gives you acceptable power, then you are in luck. I guarantee that if you put that engine in a savage or an MGT or any other vec that has the tank directly in front of the carb, then your turn leaning issues will go away no matter what pipe you use, and you will most likely make more power using the pipe that is tuned for that motor. It also seems that the problem is amplified due to the quality (or lack thereof) of the stock revo tank. My kid has a 323 in his with a golden horizons aluminum tank and has no leaning issues, using the pipe that came with the 323. We had turn leaning issues with it using the stock revo motor, and this was with the stock "upgraded" tank.
Posts: 70 | From: Seward, Alaska | Registered: Mar 2006
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posted
look man my only thing is saying that don't knock the guys at traxxas because there stuff don't work with after market products, and by the way the savage tank is on side of the engine, i have 2, well the savage .21 and the savage .25 plus the tmaxx tank is on the side also right next to the engine... don't know about the latest savages or the MGT... but they work fine... and just so that you know i had two revos from the get one i made race ready with the ballistics extended chassis and bought the tm323 to put in it to race with the big bois since last year and the other just to beat around with, and the only problem i ever had with fuel leaning was when i put the tm323 on it... thats all i saying... don't get me wrong i am just saying if you design an engine for a particular vehicle then test it in it... and fix the problemthe engine is great... and oh for your info i put the 2 chamber pipe in it that rb made and guest what, after 2 tanks of running today no leanin issues running in circles all of both tanks.... and tekno did not build there kits to help with the leaning issue they did it so yu can have to option to put a bigger tank on your vehicle and alot of people tried this with other tanks and it still leaned out... so i guess there is a lot of quality issues out there with tanks.. just saying... i hear what yu saying with the whole physics of it just rem. that it was design to work with waht it came with..... and also there is know such thing as an upgraded revo tank... just the seal is changed.. if this is and upgraded tank well so be it.. i guess that term is all relative
Posts: 215 | From: usa | Registered: Apr 2006
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I have the tekno stuff that you are referring to and a hellfire 150cc tank. I also have 10" of fuel line, a big daddy fuel filter and 6" of line from pipe to tank. Logically threaded from tank pick up to roll bar and looped twice with the one loop on each side of the big daddy filter.
As of yet I have not experienced any of the tuning problems that you are all discussing.
The only problem that I have encountered is shreading the stock traxxas spurs. Cost me dearly this last weekend at C.O.R.C.S. Nationals in Calgary Alberta Canada. Ended up in 10th after a very long pit in a 45 min main. This will be fixed before Winter Nationals in Red Deer Alberta Canada in March of 2007.
Hope this helps
-------------------- To Many Mods To List Posts: 90 | From: Winnipeg, Canada | Registered: Sep 2006
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Is it possible for you to send me pics of your setup. I recently put in a 323 in my revo, runs great, but am experiencing the same problems mentioned above with the stock tank. Im willing to make the necessary adjustments but need a look at how it all fits. ebrowen@tx.rr.com
posted
Hey guys, this whole thing has been going on for ages and ages and yet still no one has a definitive answer on how to rid the revo of those fuel issues, arrrgh.
Rant over....I too have a Revo 2.5R with a 3.3 on board and runs quite good, but the need for speed is still there. I have a 323 still in it's box awaiting installation (and a 3.3 chassis to bolt in too) BUT!!!! I want to get this fuel issue SORTED before i stick the new donk in the revo.
I do however realise that there are 3 main factors plaguing the Revo 1; tank location, 2; exhaust back pressure and 3; the higher fuel demand from the RB.
Can't do squat about the tank except use a design that has more baffles in the tank near the pick up area.
Back pressure can be increased by a dual chamber pipe or by using the uniflow mod idea
As for the fuel demand, cant do much there either, except put a restrictor in the carb to reduce fuel use and POWER, stuff that.
Just thinkin out loud here, I got meself a 1/8 th buggy tank coming soon so that may solve the issues.
Til then happy bashing
Twin
-------------------- Too much speed is never enough Posts: 13 | From: Perth, Western Australia | Registered: Sep 2005
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posted
man i tried everything on my truck.... and nothing really worked... all i did was go back to my 18 and the problem went away... is the problem a tank location problem????? i don't think so seeing that the factory drivers are going back to their stock tank location... and the only reason the went to a different tank was too get a little long run times between pitt stops... i have ran the OS Vspec, maxx 26, 3.3, 2.5r, 18tm/tz, 323 and 523 and the only one to give me an issue was the 323 consistently and the 523 when racing long mains it would give the same effect even with a full tank and temps were around 250 - 270 which isn't that bad.... considering other factors.... so i just race the 18's and the 3.3 and use my RB to drag race....
Posts: 215 | From: usa | Registered: Apr 2006
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Hiya pplz, just wonderin if the uniflow mod would work on the revo. Stock tank and all, all i was gonna do is extend the tank pressure line from the fuel lid to the bottom of the tank via fuel tube and a fuel tank nipple. Have heard it works a treat.
Thoughts?
Twin
-------------------- Too much speed is never enough Posts: 13 | From: Perth, Western Australia | Registered: Sep 2005
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posted
Only way to find out is to try, but personally I do not think this solution will change the problem you are having. I have seen some topics where the solution has been found on this forum, I suggest you use the search option of this forum to find them.
posted
Very interesting thread. I moved my tank to the front where the steering servo used to be on the drivers side(rhd) cable tied to the top of the opti-drive cover and still have this issue, not as bad as with the tank in the stock position, but still noticable. This is still using the stock tank. Now what? Seems to me the placement of the tank has nothing to do with it.
Could it perhaps be to do with the angle of engine and the carburettor. Seems like the most logical explanation.
I will be trying the tekno tank mod and the Mugen MBX-5T tank. It that don't cure it, I will be really peed off.
Posts: 30 | From: Surrey, UK | Registered: Dec 2007
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posted
I run 3 rb engines in my revo never had a prob with any of them. All i can say tune Just my 2cents
Posts: 12 | From: Australia | Registered: Jun 2007
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posted
From what I understand, all tuning does is mask the issue and make it more or less noticeable, but it never truly goes away.
I read on another forum that the only way to truly get around this is to change the carb. I have no idea what other carb would fit and why that would make a difference???? Anybody?
Posts: 30 | From: Surrey, UK | Registered: Dec 2007
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posted
IMO this left turn problem can't be caused by:
- tank position - engine - pipe - carburetor
IMO this is just caused by a none-perfectly designed tank with either a wrong outlet position or baffles placed wrong.
Never hearing people talking about Savage cornering problems.
IMO with tune or more back pressure you can keep the engine alive but probably just because it uses excessive fuel in left turns because of a setting a little on the rich side.
If any engine in any car has those problems then this is always up to the car's fuel system.
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