76.4 got ecu /problem fixed thanks to this forum

[peter]

ive had my r r ecu unit for 8 months sitting in my garage bkuzz when bought it only ran 7650,but became member of this forum and started asking questions and the hulk recomended talking to mark wich i did
he told me just to take of my knock sensor upgrade wich is a piggy back
cable on the harness ,i did and what do you know 8350 to 8400 with sometimes jumping to 8450 ,ran 76.4 best run of the day but consistent
75"s all day,rr ecu,rr intercooler ,10:1 pistons ,riva filter,riva scoopgrate
solas in the box prop,next im getting prop repitch,thermostat,and rear exhaust,also 93 degrees, heat index 100,80%humidity im very happy thanks for all your help and input to greenhulk.net and all its members
by the way smoked everyone on the lake

[Green Hulk]

It seems like Rotax Racing would mention in their instruction for installing the Rotax Racing ECU that if you have an 04 model and have had the knock sensor update that you MUST remove the piggy back harness from the knock sensor. This would prevent LOTS of problems.

Glad you found your problem Peter and nice numbers too!!!

[jack14r]

i have had the same problem with a 2004 rxp the rr ecu drops 200 rpm when i install it can you give me detailed instructions on how to fix the problem

[Green Hulk]

Jack, did you have the knock sensor update done to your ski when it was still equipped with the stock ECU? If so you need to remove the piggy back harness off of the knock sensor connector.

http://www.greenhulk.net/forum/viewtopic.php?t=245

[jack14r]

i am not aware if the update was done

[Green Hulk]

Well, if you didn't bring it to your dealer to have the knock sensor update done then im sure it wasn't done therefore its not your problem.

[jack14r]

will the ecu help a stock engine that has ic,vortex wheel,exaust mod,cold air mod?

[Green Hulk]

Yes, that is the level of modifications i was running when i initially purchased my ECU.

[jack14r]

did the factory do any recalls in house in 2004 or could my dealer do it at the first service in 2004?

[Green Hulk]

It is a distint possibility that your dealer did it in 04 before it was sold to you. An easy way to determine this is to check to make sure there isnt a piggy back harness plugged in between the main harness and knock sensor connector. See the link above for where its located and what it looks like. If it is in place remove it and plug the main harness directly into the knock sensor connector.