825 replies to this topic

[Roger Caddell]

We fit the wide version into our '91 SM without the floor/tunnel modification and the cage in that car was not built super tight to the contours of the car. But since we believed in the seat and it's additional safety and comfort we made it work... it was tight!

[Bench Racer]

Jason, the best part of your build is your sharing info for all to learn, especially your engine build. Got ta love your cc'ing. 

Thank you

David

[Jim Drago]

Ha.  Sorry to disappoint.  I was traveling for work all last week, thus no time for the forums and certainly wasn't home to do work on the car. 
 
But, just for you two, a graph: 
 

that is definitely the most accurate graph you have posted You can add a lot of things that forum time takes away from

I like the bottle method. I use those bottles but never weighed before
Jim

[Erik Hardy]

Jason & I were talking about CCing over the weekend and maybe some of you tech-shed/runoffs/rules guys can comment. During the official teardown and CC'ing process, are officials taking into account the head gasket geometry? Further explained; the standard bore is 83mm, and I think the Head gasket has a thickness of ~.030" and a bore of ~84.7mm. Are measurements being taken off of the head gasket geometry to get the official CR or are they assuming a 83mm Diameter head gasket at a standard/nominal head gasket thickness? 

[speedengineer]

Jason & I were talking about CCing over the weekend and maybe some of you tech-shed/runoffs/rules guys can comment. During the official teardown and CC'ing process, are officials taking into account the head gasket geometry? Further explained; the standard bore is 83mm, and I think the Head gasket has a thickness of ~.030" and a bore of ~84.7mm. Are measurements being taken off of the head gasket geometry to get the official CR or are they assuming a 83mm Diameter head gasket at a standard/nominal head gasket thickness? 

Yup, and more than just that.  Allowed to scrape carbon off?  Accounting for the piston top land crevice volume?  Accounting for ~2% change in fluid density when dispensing air temperature fluid from a burette onto a potentially still hot engine block?  etc.

 

Further, there is uncertainty in the CR measurement process.  Let's use my uncertainty calculation of 0.1 CR.  So if tech measures you at 0.05 CR over your limit, are you getting DQ'd, or do they recognize that maybe the measurement process isn't quite perfect and let it slide?

 

I have no interest in pushing the limits this far and will be leaving a margin, but I am curious to the answer.  Interesting discussion.

[chris haldeman]

The exact sheet currently used is available in the gcr. .01 over is dq'd
Sheet includes actual inside diameter of gasket
Top ring land depth
Piston top radius/bevel
Actual bore
Actual stroke
Process was done very well at the runoffs. Aside from a transposed number on the champs car

[speedengineer]

The exact sheet currently used is available in the gcr. .01 over is dq'd
Sheet includes actual inside diameter of gasket
Top ring land depth
Piston top radius/bevel
Actual bore
Actual stroke
Process was done very well at the runoffs. Aside from a transposed number on the champs car

 

Thanks Chris!  Good info to know, didn't realize that excel worksheet existed. 

 

Page:

https://www.scca.com...orms-procedures

 

Direct link:

https://www.scca.com...ation2/download

[speedengineer]

Well, the seat does fit.  Mocked up the pedals, dash, and steering wheel tonight to get an idea of where the seat will need to go for best driver ergonomics.  While the seat fits well enough and I'm comfortable, I am going to wait to get my Recaro Pro Racer Hans back and compare the fitment/comfort/ergonomics of both seats back-to-back.  That means I'll be putting the cage build on hold for a couple of weeks.  No worries, plenty of other stuff to work on in the meantime.  Primarily engine build, but also can do parking brake removal, subframe painting, brake caliper rebuilding, door panel trimming, battery hold down bracket improvement, could put SM suspension on, and about a dozen other things. 

 

PS:  That tan dash is looking real fast! 

 

 

[Caveman-kwebb99]

looking good

[Jim Drago]

PS:  That tan dash is looking real fast! 
 
 

I have black paint and black dashes...

[speedengineer]

I have black paint and black dashes...

Yeah but didn't you know the tan dash is lighter than the black one?  Less pigment used in the plastic results in a lower density material.  Lower CG height, more rear weight bias, competitive advantage!  hehe...

[Dave D.]

Maybe you can guilt Jim into donating a black dash to the cause!! He hates them so much that if you keep posting pictures of the tan dash he will break down and send one!! 

[Tom Hampton]

Maybe we should all post pix of our cars with tan dashes in them. Might be worth th trouble to go get one!

There's a graph in here somewhere correlating drago's irritation level with something.

[speedengineer]

Alright, who wants to help me decide which data system to get?  You get three options to choose from:

AIM MXL2

AIM MXG

AIM MXS

 

Can you tell that I like AIM products? 

 

Looking for input/thoughts from those that have used these!

 

Hardware specs are just about identical between all three.  The MXL2 is the cheapest (correction, least expensive), and will fit nicely in front of the oem cluster due to its shape.  But that full color screen on the MXG/MXS is so snazzy.  But then the question is, which size?  MXS screen is smaller than the MXL2 screen, and the MXG is so big I'm not even sure it would fit well?  Has anyone used the MXG and can verify if it will fit well?  Looking through a small 330mm diameter Momo wheel, so the screen can't be too large or I won't be able to see all of it..  Anyone who's used the MXS, is the screen big enough to fit all of your info on it and still be legible at a quick glance?

 

[Roger Caddell]

If it helps, here are links to the actual specs and install templates. With these you can quickly mock-up a display and get a clear idea of the sizes.

 

   MXL2 Tech Specs:  http://www.aim-sport...ifications.htm 

   MXL2 Install Template:  http://www.aim-sport...n_template.pdf 

 

   MXG/MXS Tech Specs:  http://www.aim-sport...ifications.htm 

   MXG Install Template:  http://www.aim-sport...n_template.pdf 

   MXS Install Template:  http://www.aim-sport...n_template.pdf 

[speedengineer]

If it helps, here are links to the actual specs and install templates. With these you can quickly mock-up a display and get a clear idea of the sizes.

 

   MXL2 Tech Specs:  http://www.aim-sport...ifications.htm 

   MXL2 Install Template:  http://www.aim-sport...n_template.pdf 

 

   MXG/MXS Tech Specs:  http://www.aim-sport...ifications.htm 

   MXG Install Template:  http://www.aim-sport...n_template.pdf 

   MXS Install Template:  http://www.aim-sport...n_template.pdf 

Thanks!  I had found those tech specs, but didn't notice the templates.  I'll have to print some out and test fit.

 

I've seen a video of the MXL2 comparing the screen readability in shade vs direct sunlight and it didn't seem to make a difference.  Anyone know if the color screens remain readable in direct sunlight?

[Mark]

Your graphics are not quite right. The MXL2 is about 7.3" wide, the MXG is over 9". The MXS is a bit smaller than the MXL2, maybe .75" narrower. The MXG is much larger than the others. The horizontal shift/warning lights may make the MXS more "small wheel" friendly than the MXL2. I don't think the MXG is feasible in a Miata but prove me wrong Both the MXS and MXL2 work well in a Miata but care must be taken to get the view through the steering wheel correct.

Alright, who wants to help me decide which data system to get? You get three options to choose from:
AIM MXL2
AIM MXG
AIM MXS

Can you tell that I like AIM products?

Looking for input/thoughts from those that have used these!

Hardware specs are just about identical between all three. The MXL2 is the cheapest (correction, least expensive), and will fit nicely in front of the oem cluster due to its shape. But that full color screen on the MXG/MXS is so snazzy. But then the question is, which size? MXS screen is smaller than the MXL2 screen, and the MXG is so big I'm not even sure it would fit well? Has anyone used the MXG and can verify if it will fit well? Looking through a small 330mm diameter Momo wheel, so the screen can't be too large or I won't be able to see all of it.. Anyone who's used the MXS, is the screen big enough to fit all of your info on it and still be legible at a quick glance?

[Richard Astacio]

Does the MXL2 use the race studio 2 or 3? 

[Richard Astacio]

Here is a pic of the MXS on the dash of my NA 1.6, I was pretty happy with the size. 

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[38bfast]

Race studio 3 for all the new mx units. Also now connects with Bluetooth. I like the MXS for the price delta