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Underbody braces, turbos and more!

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PostPosted: Sat Sep 04, 2010 9:10 pm 
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Joined: Sat Feb 23, 2008 1:43 pm
Posts: 59
Location: trinidad
my mech advised i used #8 plug in my 10-1 motor(mk3 gti) we are turbochargeing i have 95 octane gas here what u guys think 2 cold
(no management system just manual distributer retard)


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PostPosted: Sun Sep 05, 2010 2:13 am 
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Joined: Mon Mar 14, 2005 10:19 am
Posts: 361
Location: Canberra, Australlia
How much boost? I have always used standard NGK's (standard heat range), Denso's and NGK IX's when running up to 11psi. Maybe one or two colder at higher boost would be fine. For the price of plugs how about running one colder doing some hard runs and pulling them to check out what they look like.

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PostPosted: Sun Sep 05, 2010 9:19 am 
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Joined: Sat Feb 23, 2008 1:43 pm
Posts: 59
Location: trinidad
7psi but my mech in contemplating d heat climate were i am


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PostPosted: Sun Sep 05, 2010 11:51 am 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
that's the crudest form of thermal management, cheap, but it's really just a patch.

heat is power. what do you think spins the turbo? for efficiency, generate the heat but use good thermal management techniques to shed it. use heat shielding to control the heat, focus it to the points where it's beneficial. the concepts are reasonably easy to read up on and there are lots of suppliers for the products.

well designed thermal management is not as cheap as a set of spark plugs but it's a lot more reliable and efficient. it's the difference between an atomic bomb and a power generating plant.

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PostPosted: Sun Sep 05, 2010 11:53 am 
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Joined: Mon Mar 14, 2005 10:19 am
Posts: 361
Location: Canberra, Australlia
My car is in sydney Australia. Temps there are not much different to Trinidad (we are generally at low 30's - celcius - in summer). I think it is overkill but as mentioned do some runs and check the plugs.

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PostPosted: Sun Sep 05, 2010 11:57 am 
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Joined: Sat Feb 23, 2008 1:43 pm
Posts: 59
Location: trinidad
cool guys will do thanks for all your advice


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PostPosted: Sun Sep 12, 2010 1:27 am 
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Joined: Sat Mar 22, 2008 8:44 pm
Posts: 46
Be aware that different plug manufacturers have different ways of marking the heat range of the plugs.

That is, an NGK xxx8 is two ranges colder than the stock xxx6 plug, while a BOSCH marked xxx8 instead of xxx6 is two ranges hotter (how stupid is that?)

(BTW anyone want to buy almost new BOSCH xx7 hotter plugs :( )

/Peter


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