Idling problem honda cbr600rr 2006

[raptor93]

⁠⁠⁠Hello,

We are a fsae team from dubai.we are running a honda CBR 600rr 2006 engine on the car with a pe3 ecu.we were able to idle the engine at 1200 rpm at first and take the car to 30 km/hr and 3000 rpm.
⁠⁠⁠However while tuning we changed the fuel tables a bit and now its not idling.we changed the settings back but it's still not idling
It's catching and running fr 2 secs bt not idling completely.
Can u pls tell us the problem and what we might be having

Thanks

[Ahmad Rezq]

I would like to know, what is meant by that the engine is not idling ?
does the engine idle at high RPMs? or does it stall ?

[raptor93]

when we start the engine it runs for 2 secs and then shuts down.This has happened recently and we have tried about everything but are not able to start it.we changed the plugs,we checked the fuel tank etc
Another problem is that the car doesn't go beyond 3000 rpm and the exhaust becomes red hot when we run it for 2 to 3 min at the same rpm (3000). when we asked pe3 abt it, they told us to change the crank settings. but this prevented the engine from starting

[Ahmad Rezq]

IMO if everything was fine and suddenly went crazy for no giving reason maybe the problem is not in your inputs to the ECU.
when the engine is running just before stalling what is the RPM value?

[raptor93]

It stalls at around 1500 to 2000 rpm

[jd74914]

when we start the engine it runs for 2 secs and then shuts down.This has happened recently and we have tried about everything but are not able to start it.we changed the plugs,we checked the fuel tank etc
Another problem is that the car doesn't go beyond 3000 rpm and the exhaust becomes red hot when we run it for 2 to 3 min at the same rpm (3000). when we asked pe3 abt it, they told us to change the crank settings. but this prevented the engine from starting


Exhaust red hot implies that you're burning in it so either you are pig rich or your timing is super retarded.

Can you post up a fuel and ignition map as well as pictures of your crank setup, etc.

I thought PE had a scope to look at your cam and crank signals, have you looked at them?

[raptor93]

These were the settings PE sent to us first with which the engine worked fine.However it did not go beyond3000 rpm and at 40 percent tps value and 3000 rpm exhaust became red hot.After this we asked PE and they told to change the settings by checking the positive going zero crossing option in the Sync input.However engine has not started since.

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[MKakli]

I don't have a lot of experience with the PE3, but from what I can tell - the setup looks correct. The reason why the engine is not revving up is because both your fuel and your spark maps are pretty flat. I am not sure if you have an O2 sensor, but that should at least let you have an idea of what the engine is doing, but make sure the exhaust system doesn't have leaks or else you will be chasing your tail.

[raptor93]

Yes we do have an O2 sensor and we tried tuning the engine using it.The values of the sensor varied between 1.09 at the beginning to about 0.78 at the point where the exhaust becomes red hot.The mixture is lean at the start and progressively becomes rich with increase in rpm and tps opening.I am pretty sure theres no leakage in the exhaust but I will still check again .However I am not sure how to fix the problem of the flat fuel and spark map to make engine rev.Does it mean I need to increase fuel as in increase injector open timing?Please tell me what I can do to rectify it.Thanks

[Pat Clarke]

Raptor,

Two thoughts come to mind...
1) Do you have an air leak on the intake side? and
2) What size is your throttle body?

Pat

[raptor93]

Sir,

1. We had an air leak problem which we corrected. when we had the problem the engine would start, sore to a high rpm then fizzle out and stop within 2 to 3 sec

2. We are using a taper bore with dia 45 at start to 40 at the end. the link
http://www.jenvey.co.uk/products2/individual-throttle-bodies/sf-individual-body-taper-bore/sf-taper-bore-body-0-inj-sfxx-45-0
(without injector)

Team Gearshifters

[Pat Clarke]

So, what do you think happens when you feed a 20mm restrictor from a 40mm throttle body?

Pat