Help!!! :( Pulley Sizes & Belt dont match!
 

3.47" Supercharger pulley
+
3.0" Supercharger pulley

Apparently I need spacers made because the 3.47 is offset by half an inch higher than the 3.0".

V3 SCi unit from Stillen Kit

What is the belt part number that would fit these pulleys?
The stock belt doesn't fit (stock supercharger belt)

My mechanic is at a standstill.

We called soho and they said they used spacers custom made to make the pulleys flush with each other.

Any ideas / help would be appreciated!

I'm curious what you mean by 1/2" higher? You need a longer belt?

Now I see what you're saying. Dumb question. Can the pulley just be flipped over 180 degrees?

Oops, I see your's already is. Damn, I just ordered a high traction jackshaft pulley and it looks like I'll be having the same issue.

Im working tirelessly to try to find the solution this is ridiculous

I am 100% sure these pulleys are in the right slots too...
my mechanic said they will try to flip flop the pulleys and put the one on left side on right and right on left but idk i think that isnt the case

My tuner suggested for spacers -- to use either washers that fit tight and snug, or to use the back of the engine / transmission pieces as spacers to help make the pulleys flush.

I attempted calling soho, vortech and topz.
topz was probably busy so ill see about pming him.

soho said they had custom spacers made to fit the 3.0 and 3.47.

vortech said they had no idea and to call stillen but we all know thats a dead end

I just talked to stillen and his tech guy is at lunch and should call me back in about a half hour. I'll let you know what he says. That's weird that it would be a different offset though.

Throughout all my research I never heard of anyone talking about this offset or changing of supercharger belt issue.....
ugh.
im super stressed atm :(

Evan (stillenz84) has the same pulley setup but never talked about these 2 issues

either my mechanic and i are doing sth wrong or idk.

im willing to pay $20 to anyone that can provide the solution for correct belt size for this 3.47 and 3.0 setup as well as how to fix the spacer issue...

pleaseee asap :(

Do not swap the pulleys from from JS to SC like your mechanic said or you will make like 6psi of boost..lol..

Assuming you have the 2.8 serp side (9psi stillen) pulley I would scrap the 3.47 and go with just the 3.0. That alone will get you to 13psi. If you want more than swap the 3.0 to the 2.8" and get the 3" idler.

If you want power now since its at the mechanic then keep the filter off and do the 3.0 only which should get you around 16psi.

Would I need to get a different belt at all if I went this route?
So what you suggest is to change only ONE of the supercharger pulley and not both?

He didnt mean that, he meant to swap the 3.47 slot with the 3.0 slot in case it was wrong haha but i doubt that makes any diff?

No new belt needed. And Yes.

Slot like retainer key?

Nooo haha. Like say u have two cups and underneath each cup is an M&M
One is blue the other green but the cups stay in same spot.

Swapping the M&Ms but keeping cups same spot is what I believe he meant. That concept if makes senseee

And ok. Ill tell him to keep the supercharger pulley and just swap out for the 3.0 and keep the other one as is.

That was a 3.2" size 8 rib SC pulley, and now will be paired with a 3.0" correct?

Should the pulleys be flush with each other

Yes, Yes.

Thank you.
My mechanic is doing as you said right now and will let me know how it goes.
If all is good then I O U

Aaron,
Is the jackshaft pulley sc side a standard vortech 8 rib? I need to swap mine out with a high traction, that's where my belt slippage is coming from.

Hey folks.

I did a little research on what belt size would fit the 3.47" 8 rib pulley.

https://jonbondperformance.com/index...oducts_id=1160

This belt apparently fits the 3.47" supercharger 8-rib pulley.

But Im not sure if it would pair perfectly with the 3.0" and 3.47" combination

I contacted "StillenZ84" (Evan) and he said you have to install a spacer on the supercharger shaft in order for the pulley to line up with the jackshaft pulley when you change out the jackshaft pulley. A longer bolt is needed also.

Lol man. I wish I could talk to him.
I been trying to reach him forever!
Glad you were able to contact him though.
Maybe he doesn't like me xD or thinks I am a weirdo for trying to contact him hahaha.

Thank you. That is valuable information that I will hold onto and remember for when I decide to actually use my 3.47" pulley and swap out with one of the stock 3.2", just to pair it with my 3.0".

Would you be able to please ask him one more thing?
What belt part number is needed for the 3.47" and 3.0" combination of pulleys?

Now that the spacing issue has a solution of a longer bolt and custom spacers added, we just need to find the correct belt.

Please and thank you if so!! Would be super appreciated and helpful for any of us that want to use that combination to make nice boost. :)

I contacted him through Instagram, if you want, I can pm you his Instagram info.

Why not use the 2.8" pulley and the 3" idler instead of messing around with custom spacers?

I will be honest haha, I do not know where the idler would go on the supercharger jackshaft side.
Would that mean theres 3 pieces total? 2 sc pulleys and an idler?

How much psi would be made with that setup? :o

Please and Thank You!

The Vortech 2A038 8 rib pulleys have a different backspacing on them than the stock 3.20 jackshaft pulley that comes with the Stillen kit. It makes the jackshaft pulley stick out from what I can guesstimate, about 5 mm's towards the front of the engine as shown in the pic that "cupcake" posted.

What I'm trying to accomplish is to replace my 3.20 jackshaft pulley with the same size high traction pulley.

Oh shiat, I just noticed this is my 666th post, the devil made me do it.

Scratch that. I see the 3rd idler now lol. Im so blind.

Gotcha.

But would the 2.8 and 3.0" idler pulley with the stock 3.0 pulley bring in 13+ psi?


Also my mechanic had a slight concern.
He said when he was manually spinning the 928 upgraded SCi supercharger v3 in my car, it sounded dry

This is because of the brand new 928 pieces that were put in, correct? Impeller, HSS bearings, etc. Correct or incorrect?

There is no stock 3.0 pulley

I meant stock 3.2 my bad lol.

You need to put oil in the SC when it comes back from rebuilding. One bottle (4 oz)

Oh yea. Pft. Duh.
I'm dumb to have forgotten that lol.

Your mechanic didn't think to pull the dipstick to see if there was oil?

Nah I think he was stressing out about the other issues that was going on at the time lol since he is the only one working on the car the entire time

But guess what though?

My car should be ready to fire up tomorrow, the A2A kit is on now, the new engine is swapped in, brand new VVEL's are in (just need to do the proper procedure for brand new ones), the new tires needa be swapped onto there (305/35/19) MT Street tires, fresh o2 sensors, bumper, headlights, and all necessary fluids.

After that it should be good to go. FINALLY the WAIT is OVER!

What did you do about your pulley situation?

We ended up taking Topz advice and scrapping the 3.47 (putting it aside and not using it atm) and just sticking with the stock 3.2" that was already on there paired with the 3.0 and the stock idler.

He said it would bring in 13 psi or so, so I'm happy with that.
And he said if I wanted to later, I could change out the idler pulley on the SC side for a 3.0" one, and put a 2.85" with the 3.0" and it would still be okay too.

That route or if I wanted power instantly I could just remove the current filter and put a turbo guard and make 16psi but I would only do that for extreme cases like if I wanted to feel it one time or take it to the drag strip lol

I'm just so happy right now that the car is finally done tomorrow lol

I'm going to upload some pictures of the process as it was being put together, the A2A kit and such.
I will also update the timeline on my thread just so I can document what happened when it happened. :)

I'm running the 2.85 and I'm seeing 12.86psi. Looking forward to seeing your results.

Hmm well. I don't know. Maybe I won't hit 13psi then because I thought smaller pulleys bring in more boost? xD

I also have the full 928 SC upgrade with the HSS bearings (x2) and the 928 impeller, an idler pulley on the serpentine side to eliminate any belt slip (thing is extremely tight now).

We'll see! And I'm running on 91 octane.

Maybe the 928 impeller will get you there. I don't know how it compares to the Si trim I'm running. Running 91 octane you're going to be really limited on how much boost you can run. Seb had to pull a bunch of timing on my 91 tune. I'm not making any more hp on my 91 tune with the 2.85 but I gained 45 more on e85. I'm making 114 more hp on e85 than I am on 91.

The fact your running low octane fuel is going to hurt. It will be hard to keep knock down. You can only compensate timing so much when you throw boost at it. Good fuel is a must for good power. I'm guessing by not having your blower spin any faster is a good thing untill you can get some better fuel into the build.

Oh. I totally understand that e85 brings in more HP.
I will swap to or at least, try out e85 later because I already have a gauge for it.
I just need to make sure it runs really nicely for a while on 91 octane first.

I do not know how the 928 impeller compares to the Si trim impeller you are running either. Maybe someone can shed some light on this?

I'm just worried about the car getting up and running first after it broke down on Feb 02, 2018 afternoon.

:)

Ahhhh..Redondo beat me to it.

Yeap. I totally understand that it will be not as powerful as it can be with running 91 octane.
However I am just concerned about safety and very nice driveability first as it is my DD.
My tuner and I both understand that e85 will definitely bring more power to the car overall, but we will do 91 octane first and then slowly transition to e85 once I get the CJM S1-SE return system which won't be for a good while and that's fine with me.

And yup, you're right haha, By not having it spin any faster is a good thing so I think the 3.0" SC pulley is a good fit right now :D Will lower the size later!

Yeah, it'll be nice to get back on the road, especially with more power. I can tell you one thing about e85. My car just seems to run smoother and crisper on e85 than 91.