Arrow slip on with race ecu ?

Fusster · Jul 8, 2016

i know theres loads of threads out there relating to should i or shouldnt i fit the race ecu when fitting a slip on,the consensus seeming to be yes fit it and thats fine......But heres my question,ive been in the motor trade for ever in the workshop etc so i have a good technical knowledge,the threads i read say the engine can run weak with a unrestricted exhaust but as the mixture is controlled by the oxygen sensor in the exhaust(thats it's job at the end of the day) i dont see how it can run weak,the sensor will send a signal to the ecu to adjust the mixture depenedant on the oxygen content of the exhaust gas.Can anyone explain why this wouldnt happen or is there something else that i'm missing ?
Ive just got a Arrow GP2 slip on hence the question

cheers

4vr · Jul 8, 2016

the ecu have limited adjustment and useually it will take some miles for the ecu to adjust, i had arrow dark with no race ecu and the dyno fuel/air ratio i was rich, draw your own conclusions, my bike ran better with the hacked ecu than the race ecu,

the race ecu has some benifits like disable exhaust flapper, and slightly better ignition, if your bike is new and under warrenty, race ecu would be best, if its not then fit the pipe and see how it feels, if your worrid have a power run and see what the fueling is doing!

Fusster · Jul 8, 2016

Thanks for that,i,m not so much worried i just want to understand the rational around the race ecu,once the engine is warmed up and the system goes "closed loop"the oxygen sensor takes over mixture control and that should be that,probaly end up getting the race ecu anyway

Dave V4 · Jul 8, 2016

I fitted a Scorpian end can and the power loss was very noticeable, definite flat spot in the rev range. It was so bad the front wheel would not lift under full throttle with wc turned of, now run an Arrow can with a race map from Gab, total contrast to the standard ecu tbh, pulls cleanly from as little as 3k and 10k+ is awesome. isn't the oxygen sensor on a narrow band circuit, so its actual input to the ecu is limited?

4vr · Jul 11, 2016

limited to .3-1.3% so not enough to make a big diff, but enough for the ecu to feel the temp difference you need around 3% more fuel to feel effects

Cosmik · Jul 11, 2016

The ECU only uses the oxygen sensors for cruise and low throttle openings to meet emissions regulations, this modifies the fuel trim tables which add to or subtract from the main fuel table. Anytime the throttle is really open the ECU uses a fixed mixture map which could be lean if you have a different exhaust etc. With a race ECU you can disconnect the O2 sensors and many do.

Fusster · Jul 12, 2016

Thats certainly diferent than in a car engine as the mixture is constantly adjusted to try to achieve a mixture of 14.7 -1 but i understand a bike engine is more stressed and the way the fueling is controled is potentialy diferent and a small change like a de restriction in exhaust gas flow could upset things,thanks for the replies

Mwcbr · Jul 13, 2016

My arse dyno told me I lost a good dollop of low down torque when I went from standard can to Austin racing gp2r on my tv4 1000 Was a totally different bike when I fitted the Gabro modded ecu.

Fusster · Jul 22, 2016

Just a update on this slightly off topic but anyway,i came to fit my arrow gp2 slip on and it wont fit ! ,from what i read there has always been a gasket/sleeve between the original silencer and the rest of the exhaust that increases the diameter to 60mm,well not any more the link pipe diameter needs to be 54mm or you need to get a gasket to increase the diameter.i got mine from wemoto Exhaust Downpipe to Silencer Collector Gasket OD 59.70mm ID 54.30mm Length 27mm Suzuki GSF600

Search

Search

Arrow slip on with race ecu ?

Fusster

4vr

Fusster

Dave V4

4vr

Cosmik

Fusster

Mwcbr

Fusster

Similar threads

New Posts