Timing wheel for the 99 SM
#1
Posted 02-19-2011 06:55 PM
Scott
#2
Posted 02-19-2011 07:04 PM
If you just have circular holes, they need to be slotted by just a little bit so you can "adjust" the wheel CW. You'll need a timing light to set the correct timing you are targetting to hit.
James York
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2003 Spec Miata
#03
#3
Posted 02-19-2011 07:20 PM
John Adamczyk
Owner/Driver - 5X Racing
#4
Posted 02-20-2011 01:54 AM
#5
Posted 02-21-2011 09:38 AM
For 1999-2005 model years only, it is permitted to alter
the ignition timing by elongating the mounting holes of the
crankshaft position sensor trigger wheel.
According to the rule "as written", it is not permisable to replace the timing wheel with an aftermarket wheel.
At the last SMAC meeting I attended, the intent from the SCCA was that the only allowable aftermarket wheel must be purchased from Mazda and will have a Mazda part number. Aftermarket wheels from other vendors would be non-compliant. I do not agree with this policy, but am willing to abid by it. I do not know what NASA's rule says.
As many of you have contacted me about timing wheels, I had planned to sell them but have decided not to based on the intended SCCA rules.
Hopefully the SMAC will correct the wording at their next conference call
Dave
Dave Wheeler
Advanced Autosports, the nations most complete Spec Miata shop
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Building Championship winning cars since 1995
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#6
Posted 02-21-2011 11:58 AM
Frank
TnT Racing
SCCA Ohio Valley Region
#7
Posted 02-21-2011 12:06 PM
From 2011 GCR
For 1999-2005 model years only, it is permitted to alter
the ignition timing by elongating the mounting holes of the
crankshaft position sensor trigger wheel.
According to the rule "as written", it is not permisable to replace the timing wheel with an aftermarket wheel.
At the last SMAC meeting I attended, the intent from the SCCA was that the only allowable aftermarket wheel must be purchased from Mazda and will have a Mazda part number. Aftermarket wheels from other vendors would be non-compliant. I do not agree with this policy, but am willing to abid by it. I do not know what NASA's rule says.
As many of you have contacted me about timing wheels, I had planned to sell them but have decided not to based on the intended SCCA rules.
Hopefully the SMAC will correct the wording at their next conference call
Dave
NASAs wording: 12.5.3 For 1999-2005 model years only, it is permitted to alter the ignition timing by elongating the mounting holes of the crankshaft position sensor trigger wheel
Personally I see no problem with an aftermarket wheel, I'll get official clarification though. Maybe a min weight needs to be spec'ed. Does anyone have several OEM wheels and can weigh them?
#8
Posted 02-21-2011 12:17 PM
Do you really think that the weight of the timing wheel will make a difference? The stock wheel can only weight a couple of ounces, they are already pretty light.NASAs wording: 12.5.3 For 1999-2005 model years only, it is permitted to alter the ignition timing by elongating the mounting holes of the crankshaft position sensor trigger wheel
Personally I see no problem with an aftermarket wheel, I'll get official clarification though. Maybe a min weight needs to be spec'ed. Does anyone have several OEM wheels and can weigh them?
#9
Posted 02-21-2011 12:32 PM
Do you really think that the weight of the timing wheel will make a difference? The stock wheel can only weight a couple of ounces, they are already pretty light.
Agreed. I'm trying to figure out why an aftermarket wheel would not be okay.
#10
Posted 02-21-2011 12:36 PM
Gotcha.Agreed. I'm trying to figure out why an aftermarket wheel would not be okay.
#11
Posted 02-21-2011 12:37 PM
Agreed. I'm trying to figure out why an aftermarket wheel would not be okay.
An aftermarket wheel would not be legal because of the: "If it does not say you can, then you can not" rule.
I have no issues with aftermarket wheels. My issue is with the wording in the GCR
Dave
Dave Wheeler
Advanced Autosports, the nations most complete Spec Miata shop
Author, Spec Miata Constructors Guide, version 1 and 2.0
Building Championship winning cars since 1995
4 time Central Division Spec Miata Champion car builder 2012-2013-2014-2017
Back to Back June Sprints Spec Miata 1-2 finishes 2016 and 2017
5 time June Sprints winner in Mazda's
6 Time Northern Conference Champion Car Builder
2014 SCCA Majors National point Champion car builder
2014 SCCA Runoffs winner, T4 (Bender)
2014 Central Division Champion, ITS (Wheeler)
2013 Thunderhill 25 hour winning crew chief
2007 June Sprints winner, (GT1, Mohrhauser)
Over 200 race wins and counting.
www.advanced-autosports.com
dave@advanced-autosports.com
608-313-1230
#12
Posted 02-21-2011 01:17 PM
Do you really think that the weight of the timing wheel will make a difference? The stock wheel can only weight a couple of ounces, they are already pretty light.
It may only be noise on the dyno to replace the stock wheel with a light weight one but for those looking for every advantage it would be another item on the list. My stock wheel weighs 8.6 ounces.
#13
Posted 02-23-2011 11:48 AM
I am glad NASA is taking the logical approach to this wording change and is not following suit, especially because they encourage aftermarket support in their classes. Closing off certain parts from aftermarket support is a mistake in the long run, as companies like mine that research, prototype, and develop race car parts, and think Spec Miata is a good market to do this in, will be forced to look into a different class for our Miatas with non-SCCA mandated parts installed.
I agree with Dave, this makes no sense, but on the other end of the spectrum I am not letting the rule wording cramp our product development and have a timing wheel available that will be NASA legal at least and is something every 99+ street Miata owner or track day participant can use despite the SCCA rules.
Sorry for the rant, this rule pissed me off when I read the fastrack.
Mine are bright green, so they won't be confused with the "SCCA legal" ones!
John Adamczyk
Owner/Driver - 5X Racing
#14
Posted 02-23-2011 11:59 AM
It may only be noise on the dyno to replace the stock wheel with a light weight one but for those looking for every advantage it would be another item on the list. My stock wheel weighs 8.6 ounces.
I know on my GTS BMW I had lightweight accessory pullies and a lightweight flywheel. Anything to reduce rotating mass and overall weight sounds like an advantage to me. Its a slippery slope.
For the same reason, I didn't like the idea of an aftermarket chin spoiler that's anything but the exact same weight as the OEM. I spent hours trying to remove weight from the ends of my BMW and move it to the middle.
"Mind the ounces and the pounds will take care of themselves."
Team ///Miata #12
PajamaPants Racing
NASA Midwest
#15
Posted 02-24-2011 03:39 PM
John Adamczyk
Owner/Driver - 5X Racing
#16
Posted 02-24-2011 03:42 PM
While I agree with Kyle that "Mind the ounces and the pounds will take care of themselves.", out of curiosity I just weighed our timing wheel and it came in at 9.0 ounces exact. Sorry everyone, there goes the "lightweight pulley improving performance theory" as Trimless's stock wheel came in at 8.6 ounces, assuming it was totally free of dirt/oil buildup. I am quite sure ours weigh the exact same as Mazdaspeeds too.
Does it really matter since the only place there is any real tech is at the national races! Where lots of racers never intend to race anyway!
K. Webb
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#17
Posted 02-24-2011 03:52 PM
#18
Posted 02-25-2011 08:31 AM
#19
Posted 02-25-2011 12:59 PM
So back to the original question- which way do you turn the wheel to advance? I think James said CW? (I guess I could just do this myself by putting the light on- which I'll need to do anyway- with trial and error)
To the right clock wise as you are looking at the motor.
Frank
TnT Racing
SCCA Ohio Valley Region
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