Is that stock piece that the M7 replaces made of plastic? Wow i didnt know that. I like this idea of a heat sheild to keep it away from under bonnet temps. Is the filter element underneath that heat shield or is it missing from the pics of the heatshield? Also is it possible to use another intake system? I noticed that the M7 positions the Throttle body lower (which i hadnt noticed till you posted those great shots of the engine.) I dont know if i like the straight filter design but i understand the reason you made it that way. I was just wondering if i can still use my Alta intake with that new M7 manifold piece. But i do like that heatshield.

 

Hi Mykl..

The heat shield is specific to our AGS system and can no be used with any
other CAI systems on the market.
The filter is indeed under the heatshield....

peter
Team M7
562-608-8123

 

yeah what about this whole idea? i asked about this some time ago on the original AGS thread. or did you find that this position for the filter was best compared to under the windshield?

 

You can not use any other brand of intake with the AGS tube due to the relocated throttle body. One of the keys to the workings of the system is the new posistion and direction for the TB. If you look at the recent photos posted showing the stock and AGS tubes you will see what I am talking about. Thanks for the post.

Randy
M7 Tuning

 

That Heatshield looks totally awesome and I can't wait to buy one.

 

I guess I'll attempt to answer my own question. I did some googling. I looked up the thermal conductivity of Basalt Fabric (.04W/m K) and Fiberglass (.04W/m K). I know thermal conductivity varies with temp but these values are both at room temp. Basalt seems to be hav an operating range of up to 2000 degrees F whereas fiberglass is good to about 1000 F.

Given they have approximately the same thermal conductivity for the given resolution and both seem to have acceptable working ranges, whats the benefit of the basalt besides bragging rights? :smile:

 

what about carbon fiber and anisotropy?

 

I am sooo getting a AGS with heat shield after seeing those pics

Where do I sign Peter?

Henry

 

It would be helpful if you didn't just drop in a term like that without explanation, since very few people that read the forums have that level of composites knowledge.

What is your concern? How it is relavant to an aftermarket heatshield (not an optical bench with tight distortion requirements)? How would that concern be addressed?

 

Anisotropy related to the CF or the basalt?
By it's nature CF should have very little shouldn't it?

Basalt on the other hand, being volcanic in nature should demonstrate considerable variance. Unless there's some synthetic way to make it more homogeneous.

Just thinking out loud

If that's really possible..........ummmm

 

a carbon fiber lay-up will conduct heat more easily along the length of the fibers (more like the carbon filament properties) and cross fiber more like the matrix; probably the same for any fiber composite. Thus the use of carbon fiber and basalt fiber may help; may not. It would depend on the construction. My comment was in response to Cheese's, mostly, who added the bit about basalt and fierglass conductivites.
DiD: are you involved with optical benches?

 

jlm: the reason I asked those questions was to try to help more people be able to understand what you were poking at.

As you say, the fibers conduct heat (and have their structural strength) along the axis of the fiber. Generally though, you have cross plys as well that are placed in some manner of quasi-isometric ply layup (0/+60/-60/-60/60/0).

For those not familiar with the term, quasi-isometeric layups are a way of orienting the various fiber plys such that the laminate behaves more uniformally. By orienting the plys at 0/+60 degrees/-60 degrees or 0/+45/-45/+90, the individual plys in the layup share the pain (load or heat) so that the laminate will behave in a more uniform manner.

To get back to why I asked the question about how it applies to heat shields: It seems to me that the primary benefit a heatshield like this is that it acts as a physical insulative barrier to the intake. It isn't trying to purge heat to a radiator, so orienting the plys in along a particular axis for the benefit of heat rejection to surfaces away from the intake wouldn't likely pay much dividend (IMO), especially since it could lead to thermal distortions that may crack the glossy gelcoat (I'm not sure if that would happen or not as I have no formal experience with gelcoat).

Therefore, it would make sense to have cross plys to have stability of the part, rather than have a part that was prone to cracks along the axis that all the fibers had been oriented along. That being the case, it leads me to the conclusion that a layup (be it carbon fiber or basalt) in this application would be oriented in fashion closer to being quasi-iso (uniform properties) than having a layup that would be directionally biased. Thus, there wouldn't be a benefit due to the axial characteristics of carbon or basalt fibers. That's not to say there wouldn't be other benefits to using those materials.

 

talkin' tech...good news!

 

DiD,

Can you elaborate on this?

 

my suspicion is that the reason the basalt fabric composite and the fiberglass fabric composite have the same thermal conductivity is that we are talking about conductivity through the sheet where the matrix properties dominate and they both use a similar matrix.

(I did a design school project one time where the shoe of an Iron was made of carbon fibers on end, to conduct heat to the ironing surface, but not to the edge)

 

Peter,

Will I need to have the AGS removed to install the heatshield?? If so should I wait till I get the heatshield before I install the AGS?

ALSO: when will i get my personal M7 super-cool AGS? the pictures are killing me I want the thing in my car now!

 

Hi Wen....

Your AGS is shipping tomorrow, sans heatshield hope thats OK...

peter

 

about installation. should i wait to get my heatshield before i install the AGS?? Sorry for all the questions! THanks in advance!

 

No..... the heatshield is retrofitable after the install, all it takes is two screws
that holds the unit in place....... :smile:

So enjoy it right away.

peter

 

There has been some discussion in earlier posts in this thread about the thermal conductivity properties of the material used in this part. From the pictures posted here, it looks like the part's primary intended function is to direct airflow from the original air intake port toward the AGS air filter when the car is moving. Because there is no cooling mechanism upstream of the supercharger, the temperature of all plumbing parts from the atmosphere to the supercharger (air filter, throttle body and tube to supercharger) have an effect on supercharger inlet temperature. The part seems to block line-of-sight between the throttle body/air filter and the bonnet, which would limit radiative heat transfer between the throttle body/air filter and bonnet. But, I would guess that other heat transfer mechanisms to the throttle body/air filter/air tube to supercharger dominate (conduction through the air tube from supercharger and bypass valve, radiation from hot engine parts, and hot engine bay air). It's hard to tell from the photos of the part if air that has passed through the radiator is excluded from the air filter, though from the very nice photos of the front of the engine, it looks like doing so would be very challenging. In all, it seems to me that thermal conductivity of this part's material would be of little consequence in influencing air temperature exiting the throttle body. Is there anything wrong with this observation?

In contrast, it seems thermal conductivity of the tube between throttle body and supercharger might be important in maintaining reasonable throttle body temperature, as the supercharger body probably gets hot. I haven't found that discussed in this forum, perhaps because it looks like both the factory tube and the AGS tube are made of materials with low thermal conductivity. Does that seem right?

 

Wow

 

Wow, I was just about to say that, or Wow, why didn't I think of that?


From the pictures it looks like the shield covers the top and ~1/2 of the back of the filter. Is my impression correct, or does the shield keep going down the back side?

 

there is a mechanical connection (bracket) between the throttle body and the engine in the stock system, effectively keeping the tb closer to the temp of the bracket

 

The stock bracket has rubber grommets at the lower attachment, which may act as an insulator. Without the small amount of flexibility the rubber provides it would be much harder to remove the throttle body.