Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: Streetwize]
#1423630
04/22/13 10:04 AM
04/22/13 10:04 AM
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Joined: Jan 2003
Posts: 11,732
Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,732
Portage,michigan
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Not a dyno guy, but I have had combo's that made best ET with 32 degrees of timing, and others liked 40. These two extremes were both tested at the track over other timing settings .
My guess is that the above is the same answer you will get from others
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam
Best so far, low 10.30’s 1/4
1.41 best 60 foot
6.56 at 104.17
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: B3422W5]
#1423631
04/22/13 10:40 AM
04/22/13 10:40 AM
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Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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My indys and a four inch liked 42* never tried more.
Brett Miller W9 cnc'd heads
STR Chassis fabraction
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: B3422W5]
#1423633
04/22/13 11:16 AM
04/22/13 11:16 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
My indys and a four inch liked 42* never tried more.
Good point
I had eddies on a 4 inch flattop shortblock that liked 35, put W5 heads on that same shortblock and liked 40
Built new dome piston shortblock and same exact heads ran best with 32 degrees... Lol
Just takes trial and error at the track... Lol
Friend had B1ba heads that liked 40 as well
My W-5s with a 4" liked 39* on the dyno... thats with
10.7 compression and 93 octane... .040 quench and
22cc dished pistons... that just tells me the W-5s
arent that efficient on the burn... the more efficient
the head the closer it should be to 33*
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: MR_P_BODY]
#1423635
04/22/13 11:56 AM
04/22/13 11:56 AM
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
Streetwize
OP
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OP
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Joined: Jan 2003
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Weddington, N.C.
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Smaller more efficient chambers generally mean less lead, but with strokers that can be countered by more displacement (and especially more FUEL) needing a bit more time to light off. Still T&T'ing my combo and getting good results. Getting my combustion to about a perfect burn and to the point to where I went fatter and it slowed a tenth and 1 mph....but now I'm temped to throw more timing than 34 degrees (and more than I would intuitively think it WANTS) at it and see if it picks up before I jet it back down. Car so far went 11.44 @ 116.6 .....Leaving in SECOND GEAR  (shifter issues-don't ask).
Last edited by Streetwize; 04/22/13 12:13 PM.
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: Streetwize]
#1423636
04/22/13 02:02 PM
04/22/13 02:02 PM
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
Streetwize
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OP
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Weddington, N.C.
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Video of second gear launch pass, at least I know the vert's got plenty of stall  http://youtu.be/ifZtYMmDqykDoing the math (1.54 second gear launch x 4.10 rear gear) this would be like launching in first (2.74) with a 2.30 rear gear!....and on a 30" tall (295/65R15 M/T Drag radial) tire Guess I can safely say that Torque ain't an issue  It still went a low 1.7 60' so it didn't feel that bad behind the wheel....so I wonder how taking off with the 11.23:1 first gear ratio will help my times compared to this 6.31:1 start. Think I'm ordering a Cheetah SCS for it, the Hurst Pro ratchet that was in it when I bought the car has got to go 
Last edited by Streetwize; 04/22/13 02:42 PM.
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: FlyFish]
#1423638
04/22/13 03:30 PM
04/22/13 03:30 PM
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
Streetwize
OP
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OP
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
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Fly,
Yeah I think it'll pull a high 1.40 once I get the shifter straightened-out....it's already going 7.30's in the eighth at 96, tou can see It's got a lot of 'Natural' hook even with 'No gear' and a tall tire.
This launch would be equivalent to a normal 2.45 first gear 904 launching with about a 2.56 rear end. In that light I guess an 11.44 is pretty respectable!
I'm gonna bump the time to ~38 and see if it likes it higher, 34 I think is holding it back some too. It felt like it wanted more when I first set the timing.
Last edited by Streetwize; 04/22/13 03:37 PM.
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: DJVCuda]
#1423642
04/22/13 04:32 PM
04/22/13 04:32 PM
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Joined: Jan 2003
Posts: 6,266
Renton Washington
Triple Threat
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master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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My car ran 10.90's with the 2.74 first gear, once i left in second on purpose and it went 11.30's
-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: Streetwize]
#1423643
04/22/13 04:48 PM
04/22/13 04:48 PM
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Joined: Aug 2003
Posts: 43,352
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,352
Bend,OR USA
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Bobby, a good freind of mine who ran NHRA stock(former world record holder in C/SA and E/SA) with a 340 six pak combination had dyno tested all three stock 1970 and 71 340 high compression intakes and carbs combinations, AVS, Thermoquad and six pak. they all liked 40 degree total timing on the dyno, he went to a race and ran 1.32 under with 40 degrees, he back the timing down to 36 degrees to slow the car down and it went 1.42 under at 36 degrees  He got hit with HP later and got beat the first round after putting the timing back to 40. He went to LACR later and treid doing some timing testing, it went faster at the track with less than 40 degrees total, as already said you have to find what your car wants at the track  
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: SB Stroker Dyno guys? Quick Ignition timing question
[Re: Cab_Burge]
#1423644
04/22/13 05:11 PM
04/22/13 05:11 PM
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Joined: Jan 2003
Posts: 9,894
Weddington, N.C.
Streetwize
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OP
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Weddington, N.C.
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Cab, Thanks buddy! I totally agree, a dyno pretty much puts a linear load (rpm rate per second) where as dynamically in the car the engine/load has far more variables to deal with. I'm an old school tuner, reading plugs and not being afraid to guess wrong on jetting and timing so long as I figure out what it needs....eventually. Try to keep picking it up until too much of a good thing starts to slow it back town. I set this toy up to run 6.90's in the 1/8th and 10.90's in the 1/4, based on the MPH and ET's I have so far and with a bit more tuning to go....I'm pretty comfortable with the way it's going. Every run so far (even in second) has still left a little (short shifts, too much tire pressure, etc) bit on the table. By my calcs a 1.7 60' time is 24.09 mph, a 1.5 is 27.27 mph, I think  I can still pick up close to 4/10th in the 1/8th without too much work, like with a trans that actually shifts down to first for a start 
Last edited by Streetwize; 04/22/13 06:19 PM.
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