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Project Jg

Started by JG , Oct 05 2005 08:16 PM

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#1581 A-F_20

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Posted 30 January 2014 - 10:20 AM

 

Mr Gumby question moment but what other benefits apart from weight?

 

Aluminium isn't a very good heat conductor, so less heat from the disc is transferred to wheel and hub. 

 

The wheel and hub have a significant mass (around 10Kg depending upon wheels, and front or back) and store heat which takes a long time to cool. If you can keep the heat in the disc it will cool (and heat up) much faster. 

 

Thats the theory. The reality, is that a 3Kg unsprung mass is a nice saving and its a bit of bling :P

 

 

Isn't that the wrong way round - Aluminium has much higher thermal conductivity than Steel, I guess that means in draws the heat away from the steel disc much faster.


#1582 Rosssco

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Posted 30 January 2014 - 10:49 AM

My understanding (and the process I've followed before) is to use a series of progressively hard stops to bring both disc and pad temperatures up to the temperature where the pad material is pregressively and evenly distributed on the disc surface. There is no mileage requirement as such as far as I'm aware, just a good number of cycles to ensure. I used the following procedure (as have many otheres) for the Brembo's on my previous 350Z. Page 22/23.

 

http://stoptech.com/.../98-646-1450-02

 

The stipulation of telling people to go easy on them for ~1000 mile is probably just to prevent people who have no clue, causing uneven pad distribution (the percieved "warped disc" phenomenon) by hammering them from new and then complaining the new discs are sh*te.

 


#1583 Winstar

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Posted 30 January 2014 - 10:58 AM

Mr Gumby question moment but what other benefits apart from weight?

  Aluminium isn't a very good heat conductor, so less heat from the disc is transferred to wheel and hub.    The wheel and hub have a significant mass (around 10Kg depending upon wheels, and front or back) and store heat which takes a long time to cool. If you can keep the heat in the disc it will cool (and heat up) much faster.    Thats the theory. The reality, is that a 3Kg unsprung mass is a nice saving and its a bit of bling :P

  Isn't that the wrong way round - Aluminium has much higher thermal conductivity than Steel, I guess that means in draws the heat away from the steel disc much faster.

yep 40-50 W/mK for steel and 200ish W/mK for aluminium. Is it very bad that I actually don't have to look that up?

#1584 JG

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Posted 30 January 2014 - 10:59 AM

Ah yes, but the theory still stands doesn't it.


#1585 techieboy

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Posted 30 January 2014 - 10:59 AM

Is it very bad that I actually don't have to look that up?

:lol:

#1586 anz3001

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Posted 30 January 2014 - 11:33 AM

We tell people to take their time for 200 miles approx but Rosssco is right to a degree, its to cover our ass first and foremost. Best way is to go with a series of 5-6 sharp stops, though not too sharp.

 

 

 

yep 40-50 W/mK for steel and 200ish W/mK for aluminium. Is it very bad that I actually don't have to look that up?

 

 

Veering off slightly. Doesnt that mean its a pretty crap material for things like intake pipes etc that are located in hot engine bays?


#1587 Winstar

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Posted 30 January 2014 - 03:48 PM

yep 40-50 W/mK for steel and 200ish W/mK for aluminium. Is it very bad that I actually don't have to look that up?

  Veering off slightly. Doesnt that mean its a pretty crap material for things like intake pipes etc that are located in hot engine bays?

Thermally yes but the combination of weight, easy of manufacture and strength at above 100'C means it about the best choice.

#1588 JG

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Posted 30 January 2014 - 09:27 PM

Vast expense Exige diffuser edging and lotus suggested silicone adhesive. 

 

I must admit i'm rather regretting it.

 

Posted Image


#1589 JG

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Posted 15 February 2014 - 09:40 PM

Posted Image

Lotus Europa canister. Ah the delight of 0 fuel pump noise. Only a trip to CS will determine that it has the supply requirement, but i suspect it will be just fine.

#1590 JG

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Posted 15 February 2014 - 09:41 PM

And of course I suspect the oem one will behave when it gets hot too.

#1591 fezzasus

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Posted 15 February 2014 - 10:18 PM

Looks identical. Is it the same part number?


#1592 JG

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Posted 15 February 2014 - 10:37 PM

Yep. Obviously in my old canister there is a walboro

#1593 oakmere

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Posted 16 February 2014 - 12:25 AM

Have you got the OBD Tunner software yet? Just thought it would save you the trip to CS. Only been in Chill's car with the Walbro pump and it sounded the same as the original. Is this a bit hit and miss with these pumps?

#1594 fezzasus

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Posted 16 February 2014 - 06:29 PM

Got it. My standard pump is fine after almost 90k miles. I'm not convinced the pump is the weakest point. The standard turbo injectors are almost at maximum for a stage 2 supercharger. I would suggest swapping those out to the VXR ones.


#1595 The Batman

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Posted 16 February 2014 - 06:37 PM

I think it's the fuel pump canister filter bag that is the problem.

#1596 Thealastair34

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Posted 17 February 2014 - 07:13 AM

where did you get the trim from, after some for mine

 

Vast expense Exige diffuser edging and lotus suggested silicone adhesive. 

 

I must admit i'm rather regretting it.

 

Posted Image

 


#1597 JG

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Posted 17 February 2014 - 08:41 AM

deroure.com

 

Prepare to have your pants pulled down. i think it was something like £58.

 

And its fitted to a diffuser that doesn fit :beat:


#1598 FLD

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Posted 17 February 2014 - 11:05 AM

Is it just panel edging that can be had off ebay?


#1599 MrGman

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Posted 17 February 2014 - 11:19 AM

This is what i've bought, actually on JG's recommendation in another thread 

 

http://www.carbuilde...annel-edge-trim

 

Is there much difference in appearance? The exige trim looks a closer/tighter fit? 


#1600 Bumblebee

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Posted 17 February 2014 - 11:45 AM

I bought some from "tat" a while ago now,It's more material like than plastic. Looks nicer IMO
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