Thanks for answering all of my questions - INTHERED
Thanks for answering all of my questions - INTHERED
LINGENFELTER MAGNACHARGED 2000 A4 Torch Red Z51 Vert, Smoothline HT, LPE IC Magnacharger, Z06 cam, LPE CNC heads, CC RPM kit, LPE hood, Yank 2800, Rossler trans, Z06 rear w/300Ms, Chrome C6 Z06 rims w/PS2s, Z06 calipers w/PF carbon metallics , Eradispeeds, WCC screens, BBK 80mm TB, TB bypass, 160 TS, GM Z06 MAF, Blackwing, Corsa Pace, AR headers X-pipe & Hiflow Cats, GM HP wires, NGK TR6s, Hptuned by INTHERED with a best 1/4 mile of 10.87 @ 128.90 mph on BFG DRs
For boosted applications and controlling knock I don't think dwell is going to help you - as RHS said. Problems arise when you have too little dwell causing misfires, but too much dwell will only burn coils.
If I were you, I would fit a set of BFR7 NGK plugs.
Any core only has so much flux it can store. Beyond this
point current makes heat, not additional spark energy.
You could determine the saturation current (or old-timey
power supply guys still talk volt-seconds, which seconds
are your dwell) pretty simply on the bench.
Different coils have different cores, flux capacities and
temperature withstand.
Dwell is only the energy put into the hole (plus losses).
It's not going to help spark knock any. A better burn
may in fact do better at combustion and cylinder
evacuation / fill, and make you -more- ping-prone if
the burn is cleaner. That just says you need less advance.
If you're "on the ragged edge" of KR it means you have
gone past MBT timing and can back off some. Couple of
degrees at least. Assuming everything is clean. Of course
injector imbalances and such can give you a weak (lean)
cylinder that does all the pinging, while the others are
under-advanced or over-fueled.
So it is best to keep the dwell tables and multipliers stock?
2016 Hellcat Challenger, automatic, black on black with brass monkey wheels
10.13@ 140 DA 5000 feet
2.75 pulley, tune, drag radials. 10 percent lower od crank pulley, 1050 ix. off road mid pipe. tune
hi im sorry to dig up an old thread, but i have a slightly different issue and there seem to be some smart guys in here.
im running the L29 vortec 454 tune from the repository, and im trying to dial it all in. ive hit the dwell time tables and it interests me that the dwell time seems to fall over rpm, i was wondering if anyone could shed some light on why it would do this?
the 454 runs a single coil, HEI spark and a dizzy. the coil is a msd 8231 but i cant find any solid prime ms figures for it, id guess 3.5ms. would it pay me to just drop 3.5ms in all rows and columns? since it was mentioned rpm has no affect on saturation? my guess would be that running 8 cylinders might start demanding too much from 1 coil and it starts interfering with each spark event, but id like to get other opinions.
ive looked up the tune for a V6 astro which shared the same coil/dizzy setup and they also have falling ms responses over rpm, but only a single row, not many rows depending on voltage like my bastardised tune. they also start much much higher and fall faster.
ill load up both tunes and hope someone has an answer, thanks in advance
.26-03-17spark timing.hpt 1999 v6 astro.hpt
1966 impala. L29 454. 0411 pcm. 2.5" twin system. comp cams XR282HR. ported heads. 1.75 rollers. 60lb deka injectors. bosch 044 pump. standard intake (cos' looks cool in a 66')
I don't have an answer regarding the spark dwell, but maybe I can help since its an L29. What issues are you having?
2000 K2500 - 489 CI Vortec w/ comp XE270 cam - 0411 swap and rear mount turbo
1972 M35a2
2011 LML Duramax
not so much an issue, more just trying to get everything nailed so it runs like a clock.
1966 impala. L29 454. 0411 pcm. 2.5" twin system. comp cams XR282HR. ported heads. 1.75 rollers. 60lb deka injectors. bosch 044 pump. standard intake (cos' looks cool in a 66')
Hi,
Sorry I don't know the engine etc., but as you likely read, the main issue is too much dwell will fry the coil, especially in a single coil engine, where its working much harder. Thats why the dwell is less at higher RPM - so the coil doesn't melt, lol. More sparks per second = more heat...
99 TA, Texas Speed LS376, PRC heads, 233/239 cam, Fast 92mm, 95mm TB, card style MAF, Tick TR6060, Strange 4.11 12 bolt axle & clutchpack diff, Strano springs/dampers, Vette 18" wheels, Vette disks, CTS-V calipers, 16lb flywheel, long tube headers, no cats.