I currently have an RB 523 engine in my Revo and even after extensive tuning I STILL have the dreaded left turn bog. It's terribly frustrating because I LOVE this engine, it just flat out rips!! Even runs right past my buddies 4.6 Savage. But no matter what I have tried, I still get this darn bog!! I currently have: Tekno RX relocation kit with a HPI Hellfire tank, 14 or so inches of tank pressure line and the single stage pipe that came with my engine. I don't mind the fact that I might have to buy the two stage pipe but man, is it going to fix it?!?!? I have seen mulitple people with my SAME problem and they found that the Hellfire tank was the fix. Then again, I have also heard of many people not having this problem at all. What gives?? I've got a TON of money into this thing and it is really buming me out at this point. Near ready to sell... PLEASE HELP!
Thank you, Hopeless Revo owner in Michigan...... Posts: 5 | From: Michigan | Registered: Oct 2006
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There are indeed many people who do not have any problem with the TM323 or TM523 but some do. We always do our best to give suggestions for solutiuons but cannot do more.
Impossible in this case to come up with a 100% solution because when we developped the TM323 this problem was unknown and after when we worked on the TM523 we have simulated this and also run into the same problem. To get rid of the bog while turning left is to put the tank in front of the engine. This is unfortunately not really possible in the REVO without heavy modifications.
Now some seem to have found another suitable solution and is mentionned in some topics in our forum(there is where this forum is for) however there is no 100% guarentee that these possible solutions will solve your problem.
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I guess I just cannot fathum how some people can have this problem and some do not. It really stinks because I love this engine. But, if I cannot find a way to get rid of this left hand bog problem, I will have to off the truck. Just drives me crazy because I cannot race it at my local track this way (mainly left hand turns).
Really, how can some have the problem, and some do not??
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well i was breaking in a new tm 18 for my friend on his revo and i had the same problem so is not the engine and i have the tm523 on my revo and never had this problem i have all the teckno stuff an a spyder fuel tank!!
Posts: 4 | From: chocolate city | Registered: Sep 2006
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I installed the 523 and had the problem but purchase the tekno upgrade using the hellfire tank and got rid of the problem. My fuel line going to the Carb is 10 inches and my line going to the exhaust is 7 inches. I've heard the Mugen tank is better than the hellfire tank.
-------------------- "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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but did you add or take away any fuel line at all? some people added more fuel line from the ppe to the tank and from the tank to the carb...longer lines then factory...read some of the other post...and try that...fuel line is cheap if it doesnt work anyways.
Posts: 58 | From: Saskatoon, Canada | Registered: Sep 2006
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I dont have the TM523 yet but I do have the Tekno and mugen tank mod with 3 ft of fuel line. I have read about this on various engines and or the leaning issue as fuel drops in the tank but with the extra fuel line I added I have no more issues. I cant see why the RB engine would be the cause of this. Is it in some way mounted differently or sit higher then normal?
Posts: 140 | From: Redlands | Registered: Oct 2006
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I have tried various lengths of fuel feed and pressure line. I used to run an inline fuel filter but took it out because I was afraid that it was my restriction.
Posts: 5 | From: Michigan | Registered: Oct 2006
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Hello I am new to this forum and have read several post on this topic here as well as other forums I am well aware of all the mods that have been recomended to fix this problem however I was wondering if Rb has done anything since this problem has been occouring to fix it. I have some friends that run Rb in 1/8 scale kyosho and they are bad to the bone I want to own an Rb for my revo but am leary about this problem thanks.
Posts: 2 | From: Amarillo Texas | Registered: Nov 2006
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For us the tuning problems in the REVO are not related to the engine or its carburetor, but more to the position of the fuel-tank in the car, so there is nothing much more we can do to the engine itself to solve this problem.
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I've read that the addition of a fuel filter, but with the filter element taken out, will help stop this issue (and half tank lean issue). I think the theory is that the fuel filter will act as a (very small) tank storing enough fuel to feed the carb.
Does this sound sensible?
[ 17. November 2006, 09:07: Message edited by: frankyknuckles ]
-------------------- Revo 3.3 - RB523 - CD (70/500/50) Posts: 12 | From: UK | Registered: Nov 2006
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Yes, this is possible but it will not take away the fact that in the REVO with the tank sitting in the right side of the engine, and when you turn left the engine needs to suck very hard to get its fuel while when turning right the fuel will be pushed to the engine.
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