Comptech supercharger Alternator pulley?

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Old Nov 20, 2021 | 10:26 PM
  #1  
CL6 Sean's Avatar
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Comptech supercharger Alternator pulley?

I'm installing a ct supercharger and didn't get the alternator pulley in my kit.





The sc pulley is a 4 groove.

Is there any other options? I can't find this thing anywhere

Thanks in advance

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Old Nov 20, 2021 | 10:42 PM
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Not really. You can try to find one used. Getting it custom made would be very expensive.
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Old Nov 20, 2021 | 10:45 PM
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Originally Posted by Karanx7
Not really. You can try to find one used. Getting it custom made would be very expensive.
might be the route I have to go
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Old Nov 21, 2021 | 07:05 AM
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Originally Posted by CL6 Sean
might be the route I have to go
According to this guys website, he has two high boost pulleys in stock; however, it's $$$.

00-03 Acura TL Comp Tech Sport 84mm Supercharger/Alternator drive pulley – Jon Bond Performance LLC

They might be willing to deal if they've been sitting on the shelf, though?

P.S. PM 619rcr he bought a kit from me and depending on which pulley he used on his accord, he might have one laying around? :wink:
Good Luck!
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Old Nov 21, 2021 | 03:29 PM
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Originally Posted by zeta
According to this guys website, he has two high boost pulleys in stock; however, it's $$$.

00-03 Acura TL Comp Tech Sport 84mm Supercharger/Alternator drive pulley – Jon Bond Performance LLC

They might be willing to deal if they've been sitting on the shelf, though?

P.S. PM 619rcr he bought a kit from me and depending on which pulley he used on his accord, he might have one laying around? :wink:
Good Luck!
Thanks! I'll do that.
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Old Nov 23, 2021 | 11:10 AM
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Originally Posted by CL6 Sean
Thanks! I'll do that.
@CL6 Sean
Just curious, did you score one or both of those alt. pulley's from Jon Bond Performance? LOL.
When I put the link up the price was $499.99 & two in stock. Now there are zero in stock at $299.99.
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Old Nov 23, 2021 | 03:29 PM
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Hey Zeta,
I took care of CLS6 Sean. Sold him the HBP.
Good looking out.
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Old Nov 23, 2021 | 10:56 PM
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Originally Posted by zeta
@CL6 Sean
Just curious, did you score one or both of those alt. pulley's from Jon Bond Performance? LOL.
When I put the link up the price was $499.99 & two in stock. Now there are zero in stock at $299.99.
Jon Bond emailed back saying they didn't have any in stock.

619rcr had a spare one.

Thanks so much! I'd be stuck without your help.
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Old Nov 24, 2021 | 07:09 AM
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Originally Posted by 619rcr
Hey Zeta,
I took care of CLS6 Sean. Sold him the HBP.
Good looking out.


Are you running the default CT-E 3.0" pulley on the swapped accord?

Originally Posted by CL6 Sean
Jon Bond emailed back saying they didn't have any in stock.

619rcr had a spare one.

Thanks so much! I'd be stuck without your help.
No problem.
For future reference, As Karanx7 mentioned above about having one made, the guy below claims he had an HBP Alt. pulley and S/C'er pulley(?) made at South Florida Pulley.

Originally Posted by 03 tls nc
I talked to Jon Bond before I had a pair of HBPs made by Terry at South Florida Pulley. JB's price for the ALT pulley was about 3x more that SFP's price for the SC pulley. Granted there is less work that goes into the machining of a SC pulley verses the Alt pulley. Both places provide an excellent service in my opinion, cant go wrong with either.
Originally Posted by 03 tls nc
The pulleys I had cut will produce a constant 5psi on a J35A3 with the Comptech SC kit and the FMU is handling things just fine.
It is definitely easier to change the SC pulley for sure. For the sake of belt slip increasing pulley diameter to generate a fast blower speed is better. I thought I had a line on an ALT HBP for $100 but it fell through that is what led me to find Jon Bond and South FL Pulley. The fact that I got both SC pulleys made for less than I could by the one form JB pretty much made the decision for me.

Last edited by zeta; Nov 24, 2021 at 07:12 AM.
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Old Nov 24, 2021 | 01:14 PM
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I must have missed that post. I emailed the company to see if they could make a 6 rib version of the alternator pulley. Would save me the trouble of having to go turbo lol.
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Old Nov 24, 2021 | 02:37 PM
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Originally Posted by Karanx7
I must have missed that post. I emailed the company to see if they could make a 6 rib version of the alternator pulley. Would save me the trouble of having to go turbo lol.
Nice!

I'm sure you already did your measurements; however, It looks like there is about 24/64ths (3/8') to extend out before the frame rail gets involved for the alt pulley. I'm thinking that's enough room to get 2 more ribs with a thin side guide wall?

They should be able to take the 4 rib 'file' they used, back in the day, and modify it to make a six rib?

I'd like to see the 6 rib S/C'er pulley as well.

Good Luck!

Quick and dirty measurement:

From the edge of the HBP.


Looks like the adjuster pulley has enough meat to handle the wider belt as well.


Last edited by zeta; Nov 24, 2021 at 02:43 PM.
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Old Nov 24, 2021 | 09:43 PM
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It looks like they may be able to make a pulley set for me. I will have to investigate into what diameters I want for the pulleys. Obviously, the alternator half of the pulley will stay the same, but I'll probably change the rest.

OEM alternator pulley diameter: ~2.625"

CT supercharger drive pulley diameter: 3.0"
CT high boost drive pulley diameter: 3.3"

CT supercharger blower pulley: ~3.8"

I'll probably go with the regular HBP diameter of 3.3" for the drive pulley. Do you guys have any recommendations for the blower pulley diameter?

Assuming the 2G crank pulley diameter is the same as the 3G, then the stock diameter pulley is 7.125" diameter. The OEM alternator pulley diameter is 2.625" which gives a pulley ratio of 2.71. With a 7200 rpm redline shift, the alternator pulley would be spinning at 19,535rpm. The pulley ratio from the 3.3" HBP to the 3.8" CT Blower pulley is 0.87. This means the supercharger would spin at almost 17,000rpm at redline. I don't think I should spin a M90 any faster than that, so maybe the 3.8" diameter is fine.
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Old Nov 24, 2021 | 11:17 PM
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Never mind, they seem to have no recollection of making the 2 belt alternator pulley, as they said they can only make up to a 8 rib pulley.
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Old Nov 25, 2021 | 06:52 AM
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^
Damn.

You've probably already considered Pulley Boys?

On their 'Home' page they have stated:
If you need a specific pulley and cant find it then give us a call or drop us an info@pulleyboys.com and we will quote you on a custom pulley.'

Here's all their Comptech selection:
Comptech (pulleyboys.com)

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Old Nov 25, 2021 | 02:19 PM
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Originally Posted by zeta

Are you running the default CT-E 3.0" pulley on the swapped accord?

Don't mean to de-rail the pulley discussion. I am using the normal CT pulley. Wasn't confident the well seasoned j32 could handle the HBP.

On a side note I just picked up a 18 TLX A spec and already thinking of getting KTuner. May be selling my 07 TLS 6MT soon... Happy Turkey Day all.

Last edited by 619rcr; Nov 25, 2021 at 02:24 PM.
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Old Nov 26, 2021 | 06:42 PM
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Originally Posted by 619rcr

Don't mean to de-rail the pulley discussion. I am using the normal CT pulley. Wasn't confident the well seasoned j32 could handle the HBP.

On a side note I just picked up a 18 TLX A spec and already thinking of getting KTuner. May be selling my 07 TLS 6MT soon... Happy Turkey Day all.




Thanks again, man. If you ever need anything send me a message
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Old Dec 8, 2022 | 12:47 AM
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03 TL CT Supercharger. Anyone has a spare pulley? Paypal ready lmk. Thank you
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Old Dec 8, 2022 | 12:48 AM
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03 TL CT Supercharger. Anyone have a spare pulley? Paypal ready lmk. Thank you
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Old Dec 8, 2022 | 07:41 AM
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Originally Posted by 785UA5
03 TL CT Supercharger. Anyone have a spare pulley?
You should make a WTB post in marketplace
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Old Jul 8, 2025 | 08:33 PM
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In need of assistance

Originally Posted by 619rcr
Hey Zeta,
I took care of CLS6 Sean. Sold him the HBP.
Good looking out.
hello, I just purchased a low miles origional comptech CL and I had some questions. I’m looking to find a high boost pulley, I already have it ported from TB to the runners, all lightweight pullies, and an upgraded TB. I’m looking at getting the alternator pulley but I also heard there is another for the supercharger itself. But what do I need to safely do this as I’m sure at this point I may be maxing out my fuel already. My next goal is to buy an upgraded fuel rail and fuel lines from p2r as I already have the kit that comes with the car and I’m hoping that will give me the room I need for the pullies. Thanks in advance
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