doc

at idle, why does my XP240 scanner indicate timing is at 31* when the static timing on my timing light is set at 12* advanced???????

I would figure that I should get 12* on the scanner! I must be wrong. Can anyone explain whats going on????

BTW: The ZZ9 cam and AFR 190 heads seem to pull very strong during WOT runs on the xway up to 90mph when I must back off. I got to get to the dragstrip soon.

TIA
Doc


------------------
'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(48psi), K&N filters, Hotchkis lowering springs, Car-Pro custom chip, Lay Ind. ram air kit, 265/45R16 Kumho V700 tires.
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter.
313.7Hp & 320.6ft-lbf, 13.55sec @ 105.1mph

JP84ZROC

your scanner is probably telling you that is where it is trying to put the timing but in reality it cannot because the bypass connector is unplugged.

------------------
"84Z28/'91 305TPI comp cam flowmaster TB coolant bypass/shutoff valve to heater core MAT relocated Ram-Air(home-made) gutted air-box IROC ground effects/wheels GY245/50's 700R4 superior shift kit/ corvette servo(excellent shift kit BTW) Rebuilt engine and transplanted it myself. Love this engine!
LOW performance people should drive low performance vehicles!

Kevin G

I think JP 84 nailed it on that question....I wouldnt worry abotu what the scanner is saying, and go with the timing light.

When I built my 383, 12 degrees was too much base timing for the stroked L98 I had... I had much better results running 8 degrees. HMMI think I will make a post asking what everyone runs..............