probably the bypass air noise since it's pushing more air. Gear noise really isn't as loud as people think. The bypass air "whoosh" noise is far louder than the gears.

 

anyone get a P2A00 code? Also does anyone know of any fixes!?

 

I completely agree.

I would also guess that if someone is complaining about the difference in noise between helical and straight cut, they are most likely nowhere near needing a YSi blower. That blower is about one of the biggest streetable centrifugal superchargers you can get.

 

^LOL, finally someone on the same page

VQ hater LOL!

 

I got a vortech G35, need help with my airfilter. Its hella dirty end having problemes to take it off to clean it. Last time i washed it, i took off the bumper. Is there any tricks to take it off ?

 

thru the fender liner or you can just crush it a lil and pull it from the top

 

what is the best place to hook up the boost sensor/gauge with a vortech?

 

What's the step up gear ratio?

-to calculate the impeller speed:
[5.75/SC pulley] x [upper cog pulley teeth/lower cog pulley teeth] x [3.54 x redline rpm] = impeller speed

5.75" = crank pulley diameter
SC pulley = 3.33, 3.12, 2.87, 2.62 pulley etc
non-REVUP kit: upper cog pulley = 32, lower = 28, jackshaft pulley = 3.33
REVUP kit: upper cog pulley = 34, lower = 32, jackshaft pulley = 3.12
3.54 = step up gear ratio

 

1 turn of the input shaft on the SC turns the impeller 3.54 revolutions.

 

Thanks!!

 

Let me know ur thoughts on this..

Following is my next step, which is another rout to step up the power.. The calculation formula is from the first page, so I’m basing my research on it..

I'm running an SC trim v2 blower on Non-rev:

Max Speed: 53,000 RPM
Max Boost: 17 PSI
Max Flow:1050 CFM
Max Power:725 HP
Peak Efficiency:75%

I'm also running the smallest pulley (2.87")..

to calculate the impeller speed:
[5.75/SC pulley] x [upper cog pulley teeth/lower cog pulley teeth] x [3.6 x redline rpm] = impeller speed

5.75" = crank pulley diameter
SC pulley = 3.33, 3.12, 2.87, 2.62 pulley etc
non-REVUP kit: upper cog pulley = 32T, lower = 28T
3.54 = step up gear ratio

so it's: (5.75/2.87) x (32/28) x (3.6x6600) = 54,403 RPM @ redline (6600 rpm).That’s above the blower’s max RPM by a hair margin, but I never reached that other than over the dyno and few pulls on the street... I’m planning to upgrade the cog pulley for more PSI/boost (going with 34T).

if we redo the calculation including the upgraded pulley: (5.75/2.87) x (34/28) x (3.6x6600) = 57,803 RPM @ redline (6600 rpm). Now that's almost 5000rpm above the limit of the impeller.. so to compensate the added power/psi, I'll upgrade the impeller (928 Motorsports) which raises the impeller’s RPM to 60,000 @ redline, which also raises the boost and give me more space to play.

Now, by doing the above, i’ll have another 3,000 RPM on the impeller that isn’t being used (to reach 60,000 RPM). So I’m going to raise speed limiter RPM, which should (i assume) allow another PSI.

Redoing the calculation with higher redline RPM, I got the following:

6700 = 58,679 impeller speed
6800 = 59,555 impeller speed
6900 = 60,431 impeller speed
7000 = 61,307 impeller speed

By that, I know the best and safest I can go with is 6800rpm redline. But I was also concerned about another factor, which is the max flow (rated at 1050 CFM). I’m not sure what contributes to it and how can I go on about calculating it..

 

Vortech Step Up Ratios:

V1 Superchargers: 3.45
V2 Superchargers: 3.60
V3 Superchargers: 3.60
V27 Superchargers: 4.21
V7 Superchargers: 3.45

I have no clue where people are getting 3.54 for the V2 and V3

TimRod

 

^thanks.. i did notice that on vortech's website, but i thought they were outdated and 3.54 is the correct number.

i've amended my earlier post with new numbers.

 

Very nice Max..

very similar to what I have on my mind

but if the Step up ratio is 3.60, it will make a difference..

I think I'll just go with stock cog pulley setup. 2.87 pulley and rev to 7200rpm

that will give about 58.000 rpms for the impeller

 

7200 will generate 59,349 impeller speed.. are you going with 928 impeller?

how's your build going on?

 

ForgedPerformance S1 Shortblock
Stillen Oil cooler
CJM STG1 Fuel System
ARP L19
Rev-up oil pump
and other needed stuff is ordered..
just waiting for the parts..

will Make a Thread when I recieve the parts..

and yes I will have to get a bigger IC and the 928 impeller as well..

what about your build?

 

Building my block soon... waiting for the parts to arrive.

-Wiseco pistons - 8.8:1 cr, 96mm
-Eagle rods
-ARP headstuds- L19
-ARP main bolts
-HKS headgaskets, 97mm
-Cosworth bearings - standard size
-Pathfinder cooling mod
-Tomei 264 cams
-Revup oil pump

and i'll be ordering the 34T cog pulley, as well as i'm sending the blower today to 928 to get it rebuilt along with their impeller.

 

How much for shipping the blower to the US?

 

dunno yet, i removed it from the bracket last night and packed it.. in couple of hours i'll give Fedex a visit. i got a friend over there that might get me a discount..

 

Nice..

I'm thinking it would be cheaper if they just sent me the rebuild kit + Impeller..

I believe I can do it myself..

GT-ER did it himself as far as I remember