View Full Version : Big Boost KA Timing

10-17-2002, 05:54 PM
What are you guys with big boost KA's running for base timing? My car has been running like crap for the past week (sluggish, misfiring, vacuum out of whack) so I decided to but out my timing light yesterday and I notice my base timing was about 12 degrees BTDC. Doh! I said. I must have been messed up that night I adjusted it. Anyway, I put it back to 18 degrees. What a difference it makes. So, I'm going to set it back at stock today. I'm just wondering what base timing you guys are running on your big boost KA's. I don't like the sluggishness of retarded timing and I don't have a BTM. Is stock or close to stock ok for big boost?

'97 S14 SE Turbo
10-17-2002, 06:33 PM
20 degree BTDC for me.

10-17-2002, 06:59 PM
Sorry to steal your thread, I've never adjusted the Timing on my Ka24det. Can anyone explain it a little further? I am running 9psi.

-david, 93 ka24det

10-18-2002, 08:13 PM
mine is set at 18 degrees BTDC and I'm running 10psi with no problems

10-18-2002, 09:15 PM
Stock is 20btdc, you can run 1-2 degrees more if you are careful about detonation. I run about 21-22 with no probs, 20psi on pump gas.

10-19-2002, 08:09 AM
Chris May and Dennis in atlanta both with JWT setups and MDMS's showed 20BTDC at idle, as soon as WOT showed up and about 2500 to 2800RPM, the timing dropped to 14 BTDC and slowly crawled to 16 BTDC, this is how their ECU's are set up.

If you don't have anything to control timing under boost and want to run more boost then you have to sacrifice somewhere, either with more octane to eliminate knock, or sluggish response to the retarded base timing.

I would think anything over 7 psi would be pushing it on no timing mangement, i'm suprise anyone isn't pinging at more than that.

10-19-2002, 06:51 PM
I'm currently running 20 Base timing. To get accurate timing I'd reccomend the timing lights with with a dial. I used the inductive timing light and I was still of by 3 degrees. I'm gettin ready to bump my timing up a couple of degrees. I'm also runing 11.5:1 A/F to be on the safe side.