Spark Advance jumps +20 when decel to 0%TPS.
- hsv08
- Posts: 547
- Joined: Thu May 09, 2013 6:50 pm
- cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK
Re: Spark Advance jumps +20 when decel to 0%TPS.
You think thats bad, This is a factory 09 L98 VE SS - people wonder why the RPMs hang.........
-
- Posts: 249
- Joined: Fri Feb 02, 2018 7:05 pm
- cars: L36 Vx Series 2 8/2002 Acclaim Wagon 3.8L ECOTEC II.
- Location: South Australia
Re: Spark Advance jumps +20 when decel to 0%TPS.
I guess at least they are in the green and yellow, not red
Re: Spark Advance jumps +20 when decel to 0%TPS.
I don't know how the non US GM cals work, but I bet similar. Biggest thing I do is raise up all the mph parameters so it forces idle strategy sooner, helps with the decel drop to idle stuff.
- vlad01
- Posts: 7798
- Joined: Mon Oct 08, 2012 6:41 pm
- cars: VP I S
VP I executive
VP II executive
VP II executive #2
VR II executive - Location: Kyneton, Vic
Re: Spark Advance jumps +20 when decel to 0%TPS.
Interesting, never seen an LS spark table before. Looks similar at high loads as the ecotec figures. Are LS engines knock limited?
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
- delcowizzid
- Posts: 5493
- Joined: Sat Feb 28, 2009 8:38 pm
- Location: Wellington NZ
- Contact:
Re: Spark Advance jumps +20 when decel to 0%TPS.
Ls have efficient heads and run lower timing like ecotec
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem
- hsv08
- Posts: 547
- Joined: Thu May 09, 2013 6:50 pm
- cars: (EX) VT SENATOR 355 STROKER
(EX) VT SS 304 MANUAL
NOW VX V6 HACK
Re: Spark Advance jumps +20 when decel to 0%TPS.
vlad01 wrote:Interesting, never seen an LS spark table before. Looks similar at high loads as the ecotec figures. Are LS engines knock limited?
Yep they are knock limited under WOT.
Factory ish
LS1s will take around the 24* to 26* mark
L98s can take a little more
LS2 likes a little less then LS1
The E38s knock strategy is really excessive
You can have 1 degree to much timing and it will pull 4 or 5 degrees and flatten advance enough to feel it through the whole pull.
- vlad01
- Posts: 7798
- Joined: Mon Oct 08, 2012 6:41 pm
- cars: VP I S
VP I executive
VP II executive
VP II executive #2
VR II executive - Location: Kyneton, Vic
Re: Spark Advance jumps +20 when decel to 0%TPS.
Interesting. The kidney style cambers seem to be knock limited. The wedge type like VN-VR v6 are right on the edge of knock limit with 91 but fairly tolerant with 98.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
- delcowizzid
- Posts: 5493
- Joined: Sat Feb 28, 2009 8:38 pm
- Location: Wellington NZ
- Contact:
Re: Spark Advance jumps +20 when decel to 0%TPS.
Most of the ls stuff we have on the dyno like 20-22 before you start gaining nothing buick 28ish
If Its Got Gas Or Ass Count Me In.if it cant be fixed with a hammer you have an electrical problem
- vlad01
- Posts: 7798
- Joined: Mon Oct 08, 2012 6:41 pm
- cars: VP I S
VP I executive
VP II executive
VP II executive #2
VR II executive - Location: Kyneton, Vic
Re: Spark Advance jumps +20 when decel to 0%TPS.
Compression ratio has a bit to do with it too. My VP dropped to 20º after increasing it to 10:1, even with a bigger cam but the cam timings are pretty wacky compared to the norm.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.