Rubbermount_EVO TC88A and higher compression timing

[clark_zrx]

Hey guys, been a minute but ended up on another Sportster (05 883) and like always I can't leave anything alone.

Have a bunch of parts on the way, 04+ 1200 heads and 03+ Buell XB pistons, cylinders, and cams. Using a 0.030" head gasket so static compression should be around 10.1/2:1 and dynamic just under 9:1 (Buell XB "E" cams are identical to to SE551's) and all the necessary supporting mods

My question is on my last Sportster (04 1200) I used the 35* ignition map and it worked great. I'm getting a ton of different information on how to write a timing table for this engine. Some are saying 28* max, some say 33, and I pulled a stock XB12 map and it has over 40* at 6k+ dialed in (not sure I believe that)

Anyone have a general idea of where to start?

[seajay]

I have max timing set at 30. No pinging.

[kitabel]

W/r/t static compression should be around 10.1/2:1 and dynamic just under 9:1

What's the intake closing point? Taken @ what duration?

[clark_zrx]

Originally Posted by kitabel

W/r/t static compression should be around 10.1/2:1 and dynamic just under 9:1

What's the intake closing point? Taken @ what duration?

Valve timing is:
IN 25/45
EX 59/10

[aswracing]

Originally Posted by clark_zrx

Have a bunch of parts on the way, 04+ 1200 heads and 03+ Buell XB pistons, cylinders, and cams.

Are the pistons XB9 or XB12?

[clark_zrx]

Originally Posted by aswracing

are the pistons xb9 or xb12?

xb12

[aswracing]

Originally Posted by clark_zrx

xb12

You're golden on the pistons.

But the XB's "E" cams are not exactly the same as the SE "E" cams ... same specs, sure, but the marks and the timing cup slot are not the same. Much discussion on here about using them in XL's.

[clark_zrx]

Originally Posted by aswracing

You're golden on the pistons.

But the XB's "E" cams are not exactly the same as the SE "E" cams ... same specs, sure, but the marks and the timing cup slot are not the same. Much discussion on here about using them in XL's.

I know how to install them, I'm just worried about writing a timing curve for the TC88A

[Highly-Dangerous]

Originally Posted by clark_zrx

I know how to install them, I'm just worried about writing a timing curve for the TC88A

So... how is it going with your Map in the TC88A??