07 apex gt flame thrower

[thor452]

when i open up my 2007 apex gt wide open on a straight then let off fully for a stop sign it shoots flames out the exhaust about 1 foot untill i hit the throtle again it is very bright and ushally pops as well i thought this was exhaust leaks but i had it in over the summer and the dealer replaced the doughnuts on two cylinders and it still happens . and it is louder then my friends 06 apex gt as well. any sugestions?

 

[Shootinstick]

sounds normal to me. My 07 Attak does it as well after a long wide open run.
Kind of cool.

 

[thor452]

then why would it be so much louder then the other 3 in my group I think the dealer might have missed something

 

[RTX Meirda]

i heard the faster sleds throw flames?

how is yours in a race?

 

[thor452]

It pulls the hardest out of the hole but is a little slower then two of the other 3 which brings me to my next question what is the best bang for the buck on top end?

 

[Len Todd]

It sounds to me like you have an exhaust leak. They probably should have replaced all 4 gaskets. Also, the gasket's clamps often have to have some metal removed between the clamp's two halves to get them to clamp tightly, especially around the reused donuts. Or, ... There could be a crack in the pipe/system. Also, one of the Flex-pipes could have gone bad. Sometimes they crack and then just let loose later. The cracks are hard to find, unless you are really looking.

I can't imagine a dealer just replacing two donuts. ??? I would be back in there looking for that leak.

This assumes that you have not done anything to lean out or change the fuel system.

 

[thor452]

not yet but I do have a chip that is supose to go between the mass air flow sensor and the computer do you know any thing about that will it help or hurt the performance of the machine and will it harm the machine?

 

[Len Todd]

What exactly are you talking about here. Is it a PC III or something?

 

[thor452]

It is a fast tuning motor management chip it says it works by modifying the signial to the ecu or computer for a more efficient air fuel mixture. it is adjustable for 0-30 hp gain as they claim just by turning the knob

 

[yamahahaapex]

lol i think a guy posted info on that so called chip. Most aftermarket hp gain are roughly $500.00 or more per hp. Check the apex/attak forum. Think NOS-PRO had a post

 

[Crewchief47]

The adjustable chip is a variable resistor, that's all. Save your money, in my opinion, you'll never see 30 HP from it.

http://www.ty4stroke.com/viewtopic.php? ... t=resistor

 

[thor452]

thank you for the info you guys are great
Love this site

 

[irondog rtx]

ok heres whats up your header pipes are getting worn around the bell my friend s sled did the same and started back firing take the seat of and run the sled and you will feel it leak there at the clamps bet this is whats wrong also does the sled have around 2500 miles plus

 

[thor452]

yes it has 3300 miles on it but it has been doing it since i got it last year with 266 miles on it.dealer told me to run it and they would fix it over the summer well they didnt get it right i guess

 

[Len Todd]

Sometimes you have to modify the clamps on the Donuts. Remove about 1/8" of metal where the two clamps come together. This allows the clamp to go tighter.