Adv Multiplier Dropping from 1 to .7-.88

[Kodename47]

Originally Posted by steve99

On good fuels it makes little difference, on our fuels it appears to work quite well and on south africian fuels (95ron) those guys said they could add back in up to 2 degrees timing in some areas by going full DI

Yes i don't get concerned about anything thats not over -0.7.

see link here from moto-mike
http://www.ft86club.com/forums/showp...2&postcount=17

I agree their no direct power increase due pi/di in it but if you can add timing back in as a result it would appears it worth doing. (and your not maxing out DI as mike says unlikely on NA petrol tune. Gets close on E85 though.

I had tried running more DI % on an NA car and it made little difference.

I wonder whether making the DI inject a little later would be more beneficial with regards to charge cooling? I've tried to read up on DI timing and all I got was that ideal charge cooling occurs if injecting at ~120deg before TDC.

[KoolBRZ]

Originally Posted by Kodename47

I had tried running more DI % on an NA car and it made little difference.

I wonder whether making the DI inject a little later would be more beneficial with regards to charge cooling? I've tried to read up on DI timing and all I got was that ideal charge cooling occurs if injecting at ~120deg before TDC.

So, in RR terms that would be 330, right? Would it provide the best benefit on the hot tables only?

[Kodename47]

Originally Posted by KoolBRZ

So, in RR terms that would be 330, right? Would it provide the best benefit on the hot tables only?

Do not go changing those tables without any idea what you're doing. You would do all the tables as that's how they are stock, I have no idea what would happen if you just did one table, where the switch over is etc.

As it stands the DI timing tables, I believe, show start of injection BTDC so 360 is at TDC at the start of the intake stroke.