what parts are needed to increase boost for Stillen Supercharger
 

As of right now I have the following parts/upgrades on my car:

• Stillen supercharger
• topgunz air to air upgrade
• walbro 520
• ID1050x injectors
• CJM twin fuel pump
• CJM S1.SE return system
• Motordyne cats and catback exhaust
• Stillen headers

I've read over 50 pages on the A2A thread and cant get a definitive answer on what parts are needed. I'm looking to get around 500-550hp. Also I will be running 91. Also Seb is currently tuning my car. Thanks for the help!

How much power are you planning to make ?
That would tend to determine what upgrades are needed



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good point and I was just thinking about adding that. Would be happy to be around 500-550. Will be running 91 octane unless you guys recommend other wise.

13 psi is about the max you'll be able to run on 91 octane. With the 9lb pulley and a 2.85 sc pulley, my car made 12.86 psi and 586whp on e85 with the same upgrades that you have. I can't remember what my 91 octane numbers were but was probably a little over 500.

I would go flex fuel. 91 and e85.

You list a single walbro 520 but then you show a CJM twin pump. Why would you have a twin pump set up with a single pump?

I got the twin fuel pump assembly for a pretty good price. Also when I took out my stock pump assembly the rods were already broken. So instead of buying a new nissan oem assembly I just bought the twin assembly for a good price.

And when you want to go for big power (and you will), you'll need twin pumps. :rofl2:

After reading spooler's thread I dont think that will be the case. I dont feel like replacing the block lol.

You'd never be making enough boost to lift the heads.

Haven't our engine's been known to do that around 12/13 psi

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Not sure but mine had no issues at 16.5.

That's good to know

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It depends on what fuel your using. Boost pressure is knock limited.

Here in uk its 99 octane
I believe that's like your 91

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Single 520 paired with 1050 is way overkill for 91. Not good to run rich in low boost.

It should be like 93 in the states.

Aghh ok

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Yeah, if he's only going to run 91 then you're right they are overkill. If he switches to flex fuel then he would need them.

I'm just going with what Seb is recommending. With Seb's tune my afr doesnt look rich as well.

as far as flex fuel/e85 would this be all I would need https://www.specialtyz.com/370z-g37/...-fuel-kit.html ? Also could you point me to a website where I could buy those pulleys at?

That might be bc of the way the base fuel pressure is being set. Twin pump is a better choice of staggered fuel pump setup for flex fuel tbh. Use the smaller one in low boost (or pure gas) and activate the bigger one to use both of them simutaneously in high boost (when running E).

The kit shown seems to be for NA. Seb knows what kit suits you. There are options out there.

For flex fuel you will need the Zeitronix ECA-2. I'll find the links for the pulleys.

Thanks for looking it up. https://www.specialtyz.com/zeitronix...and-gauge.html this the kit you're talking about?

9lb pulley
https://conceptzperformance.com/stil...13_p_19055.php

Supercharger pulley
8-Rib, 2.85 Vortech Improved Traction Supercharger Drive Pulley 8-Rib, 2.85 Vortech Improved Traction Supercharger Drive Pulley [V2A038-285] - $106.99 : SuperchargersOnline, Worlds largest Supercharger Resource. Get Serious About Power

You can also change up the Supercharger-side pulley ratio. Larger on the jackshaft, smaller on the supercharger. There's a small pulley thread in this topic that I started to try to break up the large Supercharger topics into sub-topics.

Yes sir, that's it.

Yep, you can. I have a 3.47 jackshaft and a 3.00 sc. The problem with changing the jackshaft pulley is that you'll need to add a spacer to the sc pulley and idler pulley because the stock 3.2 jackshaft pulley is a different offset than the vortech pulley you'll be replacing it with.

I forgot to add. If the sc pulley is changed to a 2.85 (with the jackshaft pulley remaining stock), then you'll need to change the tensioner pulley to a 3". That part # is Gates 36225.

thank you very much for the help. Will I have to change out the impeller with the new pulleys or should I be good?

It depends on your boost goal. But for other parts in its internal, the stock head unit won't hold up for long if your using exactly the same setup as that redondoaveb is having. He ran and will be running 928's rebuilt blower.

Do you have the Sci or Si blower. If you have the Si then I wouldn't change the impeller.

Of course the 2.85 is going to overspin the blower so the ceramic bearings would be a good upgrade. But, Seb had told me that he knows a few people that are overspinning it with the stock bearings and they haven't had any issues.

I got one blown away with oil coming out of the shaft seal on stock internal for that RPM. So I'd not feel comfortable without the internal upgrades. With the Si and 9lb pulley, he will be seeing a little less than 11psi. This would suffice for most of the owners dding their cars.

True. That combo netted me 540whp on e85

It's a hella good number!:tup:

470 on 91, 540 on e85. Not bad for 10.2 psi

its a Sci

You’re gonna want a much better intake with a big air filter. Others, including myself, have proven this is the best way to increase boost.