Oversized crank pulley

[s4matty]

Hi guys
Just wanted to share my latest project.
Myself and another have invested a lot of time in this pulley.This pulley is now our 3rd style/overall size,and I must say it performs awesome! It is larger than what is currently made for our platform and we are able to 1.5psi more without really much increased IAT'S on his car..
Let me know your thoughts. It was a lot of work and money to undertake for just 2 guys,mainly because we had to buy so much aluminum stock to get the price down.We are sending our pulleys out for hard anodizing to ensure it lasts a long long time.

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[usmc1994]

Wow that's really nice, what times will is support, any dyno runs ect?


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[A.Bruno6]

This is glorious! Whats the final diameter or circumference on this pulley? And what alloy of aluminum stock was used?

Great work guys, cheers!

[jran76]

1.5 psi more that what? Stock or JHM oversized crank pulley? Do you have any logs you can share?

[s4matty]

1.5 psi more that what? Stock or JHM oversized crank pulley? Do you have any logs you can share?

1.5 over the current oversized ones..We did some logging in The car it's in..I will get him to email me the logs.

[ALAN12186]

how much? looks likes an awesome piece

[jran76]

1.5 over the current oversized ones..We did some logging in The car it's in..I will get him to email me the logs.

What supercharger pulley was being used in conjunction with it?

[s4matty]

He has the cts charger pulley...I'm putting mine on and running with stock blower pulley..It's the same final drive as a existing dual pulley set up with just my crank pulley with Oem blower pulley.Im putting mine on as we speak.

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[bhvrdr]

Nice work Matty. I'm looking forward to your results. I assume the balance is the same as OEM?

I may need to contact you about this. I have a CNC shop in town that is planning to help but I need to make a smaller SC pulley for my car and mine uses a 4 bolt SC pulley now for 2016 instead of your friction fit one. I'm not sure how much this is going to cost though.

What grade aluminum alloy did you use?

BTW, did you put a thermal dispersant coating on your SC? Did it make any difference?


Mike

[s4matty]

Nice work Matty. I'm looking forward to your results. I assume the balance is the same as OEM?

I may need to contact you about this. I have a CNC shop in town that is planning to help but I need to make a smaller SC pulley for my car and mine uses a 4 bolt SC pulley now for 2016 instead of your friction fit one. I'm not sure how much this is going to cost though.

What grade aluminum alloy did you use?

BTW, did you put a thermal dispersant coating on your SC? Did it make any difference?


Mike

Hey Mike
Send me a pm and we can hopefully make something work (or help at least)
I used 6061T6 aircraft aluminum.Also I did cnc ballance the pulley.I do have a 3rd pulley if your interested in it?lol

[bhvrdr]

Hey Mike
Send me a pm and we can hopefully make something work (or help at least)
I used 6061T6 aircraft aluminum.Also I did cnc ballance the pulley.I do have a 3rd pulley if your interested in it?lol

Thanks Mattty. I'll PM you.

Mike

[613B6]

Good stuff, 182mm lower with CTS upper? You a 195?

[jran76]

He has the cts charger pulley...I'm putting mine on and running with stock blower pulley..It's the same final drive as a existing dual pulley set up with just my crank pulley with Oem blower pulley.Im putting mine on as we speak.

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Cool. Thanks. Makes sense.

[BlownOne]

Nice work brotha!

[UkuRiSh]

He has the cts charger pulley...I'm putting mine on and running with stock blower pulley..It's the same final drive as a existing dual pulley set up with just my crank pulley with Oem blower pulley.Im putting mine on as we speak.

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looks like coolant for supercharger is gone, why ?

[s4matty]

Well just went for a drive..I'm hitting 22psi on the podi,before it was 19ish
.Not saying that's the true boost,but it is showing a gain.I have the apr charger pulley on atm with it..I just did 1 quick pull because I'm not finished my meth fir blower,I'm just spraying in throttle body and intake tube..Hopefully I get my new spray nozzles tmrw so I can do some logging.

[bmoreS4]

Well just went for a drive..I'm hitting 22psi on the podi,before it was 19ish
.Not saying that's the true boost,but it is showing a gain.I have the apr charger pulley on atm with it..I just did 1 quick pull because I'm not finished my meth fir blower,I'm just spraying in throttle body and intake tube..Hopefully I get my new spray nozzles tmrw so I can do some logging.

Good stuff man, keep it coming

[1975audi]

Subscribed

[BlownOne]

Well just went for a drive..I'm hitting 22psi on the podi,before it was 19ish
.Not saying that's the true boost,but it is showing a gain.I have the apr charger pulley on atm with it..I just did 1 quick pull because I'm not finished my meth fir blower,I'm just spraying in throttle body and intake tube..Hopefully I get my new spray nozzles tmrw so I can do some logging.

Remember that you should have lost boost pressure since you ported the blower so that means it's definitely spinning faster!

[s4matty]

Remember that you should have lost boost pressure since you ported the blower so that means it's definitely spinning faster!

This is true!
Charger sure sounds crazy

[lowjonathan]

nice work
sub for more

[colby7]

Throw that bad boy on a scale!

[Loe]

Everything about this says win! Curious on the method you're using to control bleed boost

[Hofahome]

I'm confused. Is this viable for a true dual pulley setup, or does it essentially negate the need to get both blower/OD pullies?
I'd be interested but don't want to spin my charger to 50k rpm considering I already have a CTS pulley on haha

[sonic32]

I'm confused. Is this viable for a true dual pulley setup, or does it essentially negate the need to get both blower/OD pullies?
I'd be interested but don't want to spin my charger to 50k rpm considering I already have a CTS pulley on haha

Viable for dual pulley set up (I.e. This OD crank pulley and your existing CTS charger pulley) and also viable for stage 2 if you don't want you replace the charger pulley you can replace your crank pulley with this one and it spins the blower as fast as the smaller charger pulley.

[s4matty]

looks like coolant for supercharger is gone, why ?

I had another post going on that subject.Anyways my coolers got damaged and instead of paying the same price ashown a used blower I decided to try out spraying water/meth directly into the blower in 4 places..I do not have my new nozzles yet so I can't test it out yet..

[artz66]

Def interested and going to follow this.

[s4matty]

I'm confused. Is this viable for a true dual pulley setup, or does it essentially negate the need to get both blower/OD pullies?
I'd be interested but don't want to spin my charger to 50k rpm considering I already have a CTS pulley on haha

I made this with a plan to just use on a friends car and keep his factory charger pulley while still maintaining the same drive as the current duel pulley set up..I'm driving with this crank pulley and my apr blower pulley..It's not 50k rpm.lol
There us a big improvement in the 2
1500-5000rpm range..

[Hofahome]

Viable for dual pulley set up (I.e. This OD crank pulley and your existing CTS charger pulley) and also viable for stage 2 if you don't want you replace the charger pulley you can replace your crank pulley with this one and it spins the blower as fast as the smaller charger pulley.

10-4. Subbed.

[moophone]

Im interested in this as well

[Tod]

Sub'd... nice work op!!!!

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[Danny2323]

Nice work! Can you share the diameter?

[BlownOne]

This is true!
Charger sure sounds crazy

I'm jealous! My little stage 1 needs some more whine...

[613B6]

Nice work! Can you share the diameter?

The math would look like:

Stage 2
Stock Crank Pulley = 162.179
Aftermarket S/C Pulley = 57.56
Ratio: 2.82

Dual Pulley
JHM Crank Pulley = 179
Aftermarket S/C Pulley = 57.56
Ratio: 3.11

Single Crank Pulley
S4matty's Crank... = 196+
Stock S/C Pulley = 63.25
Ratio: 3.10

[jayts]

I want one, you going to produce these?


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[s4matty]

I want one, you going to produce these?


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I am thinking about it?
I'm going to throw a couple on ebay and see what happens..

[jayts]

I am thinking about it?
I'm going to throw a couple on ebay and see what happens..

Do you know what rpm it spins the supercharger to?


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[Kustomimports]

Held / seen in person. Dynamite looking, light / well made product!

[Loe]

hoping this is available in the fall, I may look into this option to push the stock S/C further. Keep up the awesome development man!

[sonic32]

If it doesn't overspin the blower with the smallest charger pulley available I'm interested as well. I think $500 for a crank pulley is a little too much and then there's the other one for $1000


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