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Old Jul 14th, 2014, 06:37 AM
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Pulley reduction 15-17-19 ?

I am wanting to do a pulley reduction but I dont want to spend the money getting a new intercooler as they are very expensive.

Will be my daily driver.

Im thinking ill just go for a 15% or should i just jump and get a 17. im assuming the 19% will produce to much heat or am i thinking about this all wrong.
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Old Jul 14th, 2014, 03:35 PM
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If you're not going to get a new intercooler I would go for the 15% some people use a 17% with no problems but you could get heat soak I would also use a high octane fuel such as shell nitro +
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Old Jul 14th, 2014, 06:45 PM
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I have a 17 and standard cooler with no issues.

Ive toyed with fitting a new cooler, but cant see the benefit for the money TBH, any aftermarket one will be roughly the same size and not much more efficient.
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Old Jul 14th, 2014, 10:36 PM
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Hi ya

15% with no ic or you will trash your engine as the IAT's and OAT'S go up you will end up with detonation.
When you do your pulley you also need to go up a heat range on your spark plugs.
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Old Jul 15th, 2014, 08:47 AM
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Quote: Originally Posted by k3fus (original)
I have a 17 and standard cooler with no issues.

Ive toyed with fitting a new cooler, but cant see the benefit for the money TBH, any aftermarket one will be roughly the same size and not much more efficient.

You wont be getting the full benefit of your 17% pulley with a standard intercooler as your intake temperatures will be high, the aftermarket intercoolers are quite a bit bigger & much more efficient
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Old Jul 17th, 2014, 01:16 AM
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ok awesome thanks guys. It sounds like i for sure should go for a 15%. As i really dont want to upgrade the ic.

I have read some people have been putting bigger hood scoops to capture more air but would that really make a huge difference or no ? it does look nice cosmetic wise but that might be the only advantage.

also @heathwebbo I currently use nothing less than 91 sometimes 92 just depends on the fuel station.

Thanks everyone for your responses!
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Old Jul 17th, 2014, 08:06 AM
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What boost pressure should you see with which size pulley?
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Old Jul 17th, 2014, 08:14 AM
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from what i have been told with a 17% you should get around 19psi vs stock at 9.5-11.5
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Old Jul 17th, 2014, 09:59 AM
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Quote: Originally Posted by Swarley (original)
from what i have been told with a 17% you should get around 19psi vs stock at 9.5-11.5

According to my scangauge i get 14psi with my 17% pulley. Not sure how accurate a scanguage is.
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Old Jul 17th, 2014, 05:25 PM
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With my old supercharger I was getting 14 to 15psi with my new teflon supercharger I am getting 18 to 19psi
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Old Jul 17th, 2014, 06:37 PM
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Quote: Originally Posted by heathwebbo (original)
With my old supercharger I was getting 14 to 15psi with my new teflon supercharger I am getting 18 to 19psi


Mine is an 06 so should have the same charger as the JCW. Its having it's Miltek fitted tomorrow and a dyno run.
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Old Jul 17th, 2014, 11:09 PM
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Quote: Originally Posted by Swarley (original)
ok awesome thanks guys. It sounds like i for sure should go for a 15%. As i really dont want to upgrade the ic.

I have read some people have been putting bigger hood scoops to capture more air but would that really make a huge difference or no ? it does look nice cosmetic wise but that might be the only advantage.

also @heathwebbo I currently use nothing less than 91 sometimes 92 just depends on the fuel station.

Thanks everyone for your responses!

Hi ya

If your going to run a pulley or any mods heat management is important, so any extra cooling air you can get in to the engine bay is good.
Also Any extra cold Air you can push though the ic through the scoop is good to.
With the pulley and plugs I would run the highest octane fuel available at the petrol station or you will melt your engine from it running lean. Or be very close to it you only need a slight hick up and your into melt down.

I know you don't want to change the ic but personal I would advise it. If it's the cost there are some good secondhand ones around.

You could if you wanted run a water meth injection system this will help you keep the air temps down. You could run a water meth system but only run water no meth

If you want to be safe buy an 11% pulley a good airbox and plugs it will most probably work as well if not better in high temps than a 15%
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