Hondata

All I really need to know at this stage is whether a change of actual cam degree timing will mean a need to change the RSX Type S basemap ignition values?

As I've previously shown in pictures, if I'm at 2k revs, it is on 20 degree cam table, and there are no large gaps between ignition values. It ...

Hi,

I have received information from the engine builder that the cams he installed are Honda OEM profile on low lobe, but different on the high lobe.

Therefore, tuning should be ok using a basemap, however, he also told me that he has changed the cam timing to 105 degrees, as opposed to standard ...

If the fueling isn't quite right, say up to +15% short term fuel trim, what problems might this cause? I've read people say short term should be about 5% or less

Hi,

I changed the low values to 20 degrees, and have attached the kal and datalog. It was juddering quite bad, but I also changed the ignition values to some that were recommended on another forum, but no luck.
Latest map V3.1.6 20 deg low cam.kal
20 deg low cam.kdl

As a test, I then changed ...

I set the cam angle to 20 degrees in the areas I mentioned above, but when pulling away slowly that 16 to 34 degree jump felt like it almost rips the engine out.
How can I go about smoothing that area, and how would I know if the new ignition value I set is safe or not?

Thanks

Just so I am sure, columns 1-6, 750-1500rpm should all be changed to 20 degree cam angle? Would a 10 degree cam be necessary at all?
What would a big step be classed as in ignition, 5 degrees or more/less?

Thanks

Hi,

Did you mean more cam angle on the complete low cam table? How would you determine how much to increase?

Does Kmanager use just the cam value it shows, or does it average across all tables? E.g. at a certain rev/load low cam is 20 degrees. Does this only use the 20 degree ignition values, or ...

Hi, yes I did but no real fix came of it.
He did mention another car with the same cams showed similar problems, and when changing to a different cam,the car was a lot smoother.
My cams are near enough stock on the low lobe though, so could it be due to partial throttle maps needing some work doing ...

Yes it has been on the dyno, not tuned by myself though.

- Kpro Version 2, Serial 7158, Firmware 2.02
- Kmanager version 3.1.4.0
- Cal file Latest map V3.1.4.kal
- Datalog juddering.kdl
- K20 now 2.2l rebored, clockwise motion fast road cams, 410cc rdx injectors Apexi cone filter, RBC intake manifold, Buddyclub header, spoon b-pipe, spoon n1 backbox ...