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40th Stillen Supercharger Build

Just recently got my car back. I bought this supercharger kit used, so naturally we were missing some minor parts. The cog belts were the wrong size (tooth count indicated

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Old 06-20-2014, 04:45 PM   #1 (permalink)
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Default 40th Stillen Supercharger Build

Just recently got my car back. I bought this supercharger kit used, so naturally we were missing some minor parts. The cog belts were the wrong size (tooth count indicated they are actually for a 350z, so they will be for sale soon!), the aftermarket coolant reservoir was too big, few bolts here and there...

After it was all installed we were able to make 400rwhp/340ftlb of torque @ 7psi.

The install/tuning was done by R/T tuning. They did an amazing job -very clean install.

We are currently working out an issue where the ecu switches into valet mode while I'm driving.

Other than that it's very fun to drive and I will post pics soon!

Also wondering if it would be worth getting the 9lb pulleys. I see some people on this forum making high 400's which is where I REALLY would like to be. Are the 9lb pulleys the solution?

Current Setup:
Stillen Supercharger Kit
928 impeller
550cc injectors
Berk Test Pipes
CNT Cat Back Exhaust
Aeromotive Stealth 355lph Fuel Pump
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Old 06-20-2014, 05:34 PM   #2 (permalink)
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I would advise going back to stock cats. We have seen significant power drops when using HFC's and Test Pipes with our supercharger. Also, if you are planning on going with the 9 lb pulley you will need at least 600cc injectors and I would recommend UpRev GT MAF's to make tuning easier.

Are you on 93 Octane?
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Old 06-20-2014, 07:18 PM   #3 (permalink)
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Thanks for the reply. Yes I run 93 Octane. I suppose long tube headers are out of the picture if im going to stock cats...
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Old 06-20-2014, 08:09 PM   #4 (permalink)
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I would advise going back to stock cats. We have seen significant power drops when using HFC's and Test Pipes with our supercharger. Also, if you are planning on going with the 9 lb pulley you will need at least 600cc injectors and I would recommend UpRev GT MAF's to make tuning easier.

Are you on 93 Octane?
Mark, won't the stock cats burn up and need to be replaced after a certain period of time? Also, isn't there potential for the stock cat debris/burnt material to get back into the engine?

How much power is lost from going to test pipes? I'm currently using test pipes. My power/tq is listed in my sig.
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Old 06-20-2014, 08:32 PM   #5 (permalink)
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the stock cats will last longer than HFC's, the ceramic oem element last longer than the coated foil in a HFC.
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Old 06-20-2014, 08:47 PM   #6 (permalink)
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How long though? OEM cats are expensive.
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Old 06-27-2014, 05:14 PM   #7 (permalink)
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Originally Posted by future370zzz View Post
Mark, won't the stock cats burn up and need to be replaced after a certain period of time? Also, isn't there potential for the stock cat debris/burnt material to get back into the engine?

How much power is lost from going to test pipes? I'm currently using test pipes. My power/tq is listed in my sig.
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Originally Posted by Team_STILLEN View Post
I would advise going back to stock cats. We have seen significant power drops when using HFC's and Test Pipes with our supercharger. Also, if you are planning on going with the 9 lb pulley you will need at least 600cc injectors and I would recommend UpRev GT MAF's to make tuning easier.

Are you on 93 Octane?
sub'd for more info
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Old 06-27-2014, 05:47 PM   #8 (permalink)
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Originally Posted by future370zzz View Post
Mark, won't the stock cats burn up and need to be replaced after a certain period of time? Also, isn't there potential for the stock cat debris/burnt material to get back into the engine?

How much power is lost from going to test pipes? I'm currently using test pipes. My power/tq is listed in my sig.
1slow370 is correct. The stock cats will last longer than HFC's and are also more durable. They are very unlikely to break apart. We have seen HFC's blow out and clog the exhaust. I would not be concerned with the stock cats breaking up and sending pieces into the engine. The exhaust gases are coming out so fast I don't even know if that would be possible.

You are going to lose almost 1 lb of boost in the actual cylinder from using test pipes so you'd probably get back 20 whp from going back to stock cats (though I see you are on an upgraded blower which we have not tested). There is a chance with the upgraded blower the boost would be too high in the cylinders but I couldn't not say without testing.

@Nism0 If you are piecing parts together for the kit, might as well go with some 725-750cc injectors.
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Old 06-27-2014, 05:55 PM   #9 (permalink)
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After my tune I will sell you my 600cc injectors cheap..
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Old 06-28-2014, 02:05 PM   #10 (permalink)
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After my tune I will sell you my 600cc injectors cheap..
PM me the price.
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Old 07-07-2014, 04:35 PM   #11 (permalink)
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Just an update for anyone interested.

I am trying to get a hold of some OEM Cats. Just ordered my boost gauge (I'm a little late on that I know). I also forgot to add in that I have a 928 impeller (will be updating that now).

I'll see how the car responds to the cats being added back on and take it from there. All around it's still very fun to drive at the moment
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Old 07-08-2014, 09:23 AM   #12 (permalink)
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With the stock cats back on you'll pick up a lot . Your only seeing 7PSI I had the impeller and was seeing 11-12 PSI and made 457 WHP g37x coupe your going to see a NICE change with the stock cats.
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Old 07-08-2014, 09:29 AM   #13 (permalink)
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Originally Posted by Nism0 View Post
Just an update for anyone interested.

I am trying to get a hold of some OEM Cats. Just ordered my boost gauge (I'm a little late on that I know). I also forgot to add in that I have a 928 impeller (will be updating that now).

I'll see how the car responds to the cats being added back on and take it from there. All around it's still very fun to drive at the moment
what boost gauge you end up going with?
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Old 07-10-2014, 07:48 AM   #14 (permalink)
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With the stock cats back on you'll pick up a lot . Your only seeing 7PSI I had the impeller and was seeing 11-12 PSI and made 457 WHP g37x coupe your going to see a NICE change with the stock cats.
I'm under the impression that I can put the stock CATs back on and see 8psi. Would I need another tune to see 11+psi?

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what boost gauge you end up going with?
I went with the PROSPORT 52mm EVO Series Digital Red / Blue Led Boost Gauge
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Old 07-10-2014, 08:20 AM   #15 (permalink)
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No way will you only see 8psi with the impeller. I had the Stillen Stock pully (8psi) and the impeller upgrade from Vortch same as the 928 and was seeing 11-12 PSI. I had no other mods the the SC or differnt pulley. I have a thread on hear all about my run at 500 WHP. Name of thread is Stillen500 WHP. You will need a new tune because you wil see more PSI.

btw 500 WHP on their kit will not happen just be happy with mid 400's .
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Last edited by ANMVQ; 07-10-2014 at 08:21 AM. Reason: Uphp
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