Timing question
 

if your timing is set at 5 degrees all the way up to 7500rpm @ 27.5psi can that causes any issues?

what on earth ???? your timing needs to change based on many aspects otherwise the car will run like diareah .. please get it tuned :icon_tup:

depends on what exactly you mean. need to see the timing map and need more specs on the turbo, the porting, and the fuel system

E85

GT4094R

Large Street Ports

Timing needs to change based on load, boost, rpm, and torque peak. If you look at any base timing map you will see it isn't locked at one setting throughout.

you are correct its

5 degrees up to 7500

6.5 degrees 7500 -8000

6.8 degrees 8000-9000

I have attached the timing map, i think i mis read the timing map please see pic attached, any insight would be appreciated. thank you

Generally rule of thumb with porting is: later intake closing timing, = better volumetric efficiency at higher rpms. That can mean less spark advance in order to reduce knock. However, you have E85. You're not really knock limited. The later closing timing hurts the low speed torque around town, especially off boost. In that case more timing could be helpful, but it's very difficult to tune timing in those areas, even with a loading dyno. You really need combustion pressure indication, and only Barry Bordes is doing that. So we usually go by rules of thumb and accepted practice.

More porting usually means more overlap. At part load that slows your burn and makes the engine require more timing and sometimes more enrichment to keep misfire under control so the engine drives smoothly.

First thing I would do with that map is add 2 degrees each 500 rpm breakpoint, starting at 5500rpm up to 7500. I'd do that across all loads. I think you've got too little timing, but I'm throwing that out there as someone with access to very little information. This really should be done on a dyno. Can you post the split map? I don't see this as a dangerous map assuming you have decent air and water temp compensations. A lot of time what does you in is some boost spike or lean out due to a mechanical problem, not the tune itself.

Your 1500 and less vacuum area is very much a driveability/idle thing. How are you controlling idle? Can you post the map? It looks like it's a Haltech Platinum Sport. How are you controlling boost?