Losing signal on tables above 6000rpm

[Craig Wallace]

Hi I Wonder if someone may offer some advice on a problem experienced while trying to Map my Honda ITR. Background: Car was bought from someone already using it for circuits. Engine was pretty standard with the exception of Skunk2 Pro series cams and Link G3 ECU. (set-up by Thor Racing) I have had the following changed - Complete top end of engine (Head Cams etc). Throttle bodies. All items are known to have ran before, on another circuit car. Nothing else changed. While trying to map it - signal completely disappears above about 6000 rpm. Completely fine up until this point - and then just disappears - then re-appears as revs fall back. Basically means that I cant map the car properly, above 6000rpm - where it is critical to get it right. Does anyone have any ideas - another tuner advised i should not be running resistro plugs or solid core leads? - Does anyone know if this could cause problem? Any other ideas? Thanks

[Simon]

What signal is disappears? Coms to the PC, RPM ?

[Craig Wallace]

Yes that is correct - when watching the fueling table and witnessing it run up - you can see the signal all the way up to approx 6000rpm, then it literally disappears, and you have no indication where the fueling is. Thanks.

[r34driftin]

Hi mate, its not something silly like vtec switching on and in the dual map mode its switching to Fuel and Ign "2" maps?

[Antony King]

I actually had this problem last night when recording nothing over 5000rpm was recorded. After a while we changed laptops and it seemed to work again. I can't tell you conclusively what it was and if the other laptop has a problem... but I had never seen that before.

[Jurgen Biggelaar]

You should most definately be using resistive plugs AND leads.  The most likely reason you may be loosing the comms signal at high engine RPM is the increased electrical noise produced by the motor at that end of the scale.  Resistive plugs and leads usually resolve this and are a must.

An alternative to this is raising slightly, your trigger filter levels and/or arming tresholds, but I would recommend firstly trying the affore mentioned option.  Leave this alternative as your last resort if everything up until this point operates well already.

Jurgen