timing questions

[tecateman]

what determines if you go plus 4 plus 6 etc? is it a trial and error thing to find the right setup? also does this rob some top end for low end and vice versa?

[papa_smurf49319]

what fuel are you willing to commit to? What elevation are you at? Whats your compression? I was told by jim at passion to run mine 7 advanced, i asked about the top end and he said i would have all the top end i could ask for with my setup and a little more lowend wouldnt hurt

 

 

 

Cody

[tecateman]

im in the planning stages of a from scratch build. im just trying to pick everyones brain some. id want pump gas only and am considering the vitos 421 cylinders with 4mm long rod. plan on building everything myself so no extra porting or anything.

 

just curious everyones setup and the effects and what made you choose your timing?

[RagunCajun]

General rule for pump gas is usually +4.

[tecateman]

so everyone running more than 4 isnt on pump gas?

[GrMeyer]

I run at +4. I do a mix of 50/50 mixed gas. Just to lazy to turn it up more. But also thinking of playing with Meth for next years dune season.

[AKheathen]

playing with meth is for tweakers with beakers, lol.......well, to answer the part about power, yes, it will be a trado-off to a point between topend and mid-low. if you are just using a plate, that is.......and for pump gas, you can range between +7 to -7 on pump for desired results. retarding the timing will gain more topend and overrev, and more advance will get you stronger bottom to mid. +4 timing on the plate is generally the best ballance on most setups for gaining stronger mid and not making any noticeable sacrifices to the topend. now, if you are running different fuels, wish to move the power a little, or need to prevent detonation, you can set it elsewhere, just play with it. another option is to run a programable cdi and use custom curves that advance it in the mid-low, while retarding higher rpms

[tecateman]

thanks ak. thats exactly the answer i was looking for.