help with base timing and total timing...
09-23-2000, 12:51 AM
#1
Supreme Member
Thread Starter
Join Date: Jul 1999
Location: Mims, Florida
Posts: 2,149
Likes: 0
Received 1 Like
on
1 Post
Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
help with base timing and total timing...
Recently I completed a cam/head swap. Out came a regroung LT1 cam and TF heads and in went a ZZ9 cam and AFR190 heads.
With the LT1 cam, I installed the cam at 4 degrees advanced. The ZZ9 cam is installed straight up.
Here, is my question:
The LT1 cam liked about 8* static timing. The ZZ9 cam likes 14* static timing!!! At 8 degrees the ZZ9 cam will stall out or run very rough.
Do I have the distributor installed wrong?
The rotor points toward the #5 intake vavle when at firing TDC.
Also, while setting the static timing with the ecm distributor wire unplugged, my scanner is reading 31* timing!!!! How can this be?????
------------------
'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
With the LT1 cam, I installed the cam at 4 degrees advanced. The ZZ9 cam is installed straight up.
Here, is my question:
The LT1 cam liked about 8* static timing. The ZZ9 cam likes 14* static timing!!! At 8 degrees the ZZ9 cam will stall out or run very rough.
Do I have the distributor installed wrong?
The rotor points toward the #5 intake vavle when at firing TDC.
Also, while setting the static timing with the ecm distributor wire unplugged, my scanner is reading 31* timing!!!! How can this be?????
------------------
'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
09-23-2000, 07:07 AM
#2
Member
Join Date: Sep 2000
Location: Pocono Pa
Posts: 160
Likes: 0
Received 0 Likes
on
0 Posts
Doc this is just a guess...but i think yer in diagnostic mode with yer scanner...with my OTC and any 87 Pontiac you must program the scanner for road test(normal mode).Just hooking on the scanner without choosing road test mode puts the computer into diagnostic mode (1000rpm idle speed....full timing advance)
Thread
Thread Starter
Forum
Replies
Last Post
