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Timing wheel for the 99 SM

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#1
Scott Malbon

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Building a 99 and making sure I have all he allowable modifications and parts. Just received the "timing wheel" from Mazdaspeed needed to adjust the timing on the 99. It is not what I expected. So how do I use it to adjust the timing?

Scott

#2
James York

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Are the bolts holes just a circle or have they been elongated? I don't know what MazdaSpeed is selling, but my bet is you got a factory timing wheel.

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.

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#3
5X Racing

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We just got our shipment of our brand of adjustable 99 timing wheels in delivered yesterday, I'll be doing a "how-to" install write up for our site within the week. I guess I can add it to this site as well, I will do that as well. Hopefully it will help out everyone wondering how to install their wheels.

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#4
Brian Ghidinelli

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Mazda(speed) is selling an adjustable wheel (painted bright red) with elongated holes. Same thing you can do to your own wheel with a dremel, but it's red! Looks pretty in the engine bay. :) This is a new part just recently added at the beginning of the year.
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#5
davew

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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

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#6
FTodaro

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On a related topic. the pully wheel on my 1999 has two timing marks a white one and then just to left of it(if your looking at the motor from the front is a gold or yellow mark. Is the white one the timing mark?

Frank
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#7
john mueller

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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?
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#8
HoneyBadger - BrianW

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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?

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.
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#9
john mueller

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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.
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#10
HoneyBadger - BrianW

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Agreed. I'm trying to figure out why an aftermarket wheel would not be okay.

Gotcha.
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#11
davew

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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

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#12
trimless

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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.
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#13
5X Racing

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From the perspective of a business owner that directly supplies aftermarket parts for Spec Miata racecars, I hate the SCCA decision to change that rule wording. Especially for a part that will make no difference if it comes from Mazdaspeed or somewhere else.

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!

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#14
Kyle Burkhardt

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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."
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#15
5X Racing

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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.

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#16
Caveman-kwebb99

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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!

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#17
Mike Collins

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The SCCA is not likely to modify the rule. It is really pretty simple. Anyone who wants to can modify the one they own by slotting the part you already have. No cost involved, just time. Or if it seems too complicated you can buy the one from MAZDA, it even has a REAL Mazda part number. Mazda is our number one supplier of OEM and aftermarket parts to the class. Once again this conquers the notion of a real or perceived advantage and levels the playing field.
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#18
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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)
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#19
FTodaro

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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.

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