***Topgunz ROTREX C38R Supercharger Kit***

The_Pappa_Rob

Haven't seen much activity here lately, but it's worth a shot. I was thinking of pulling the trigger, but I rent and don't have the room, or the patience to do an install. Any shops in the Phoenix AZ area? I'm in Tempe.

ByThaBay

Reach out to btwtuning.com they are in AZ now.

The_Pappa_Rob

Awesome, thanks!!

TopgunZ

Thats because the forums are dying. The mods are barely active. Just take a look at the dumbass tags in this thread near the bottom of the page. I have had them clean it up about 6 times and its pointless as they just delete them and do nothing about it after that.

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ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

Mr.K

Z1 just released their rotrex supercharger kit and although the fit and finish looks amazing, I can't really comment on their numbers. At 10psi they require E85 to push 395wtq, the Topgunz kit can easily push 450wtq at 10 psi on 91/93 fuel. The Topgunz kit is superior in that regard, I'm not sure if they were more conservative to get it CARB approved in the future but it seems to be track tested so cooling appears to be dialed in.

https://www.z1motorsports.com/superc...b44c1df4d30a20

Spooler

Z1 and SOHO are just copy cats. End of story.

Mr.K

It's no debate that Topgun has been ahead of the game for quite a while, while other companies with bigger marketing teams and budgets were able to reap the benefits. I think that if Topgun had better marketing of its products with some revisions to its fit and finish it would definitely be more recognized and appeal to more people.

Spooler

That's one reason I don't post anything anymore. Can't steal it if you can't see it.

Averying

This might be due to the fact that Topgunz kit can use a smaller pulley to get boost down low, then bleed off extra boost at high RPM. Z1 kit has a normal Turbosmart BOV so it can’t do that


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes

SeeThruHead

what's stopping you from putting a solenoid in between manifold and turbosmart BOV to bleed off actuating pressure....

(or do you mean it just doesn't come setup like that out of the box?)

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Averying

Yea exactly, it just comes with a normal BOV out of the box. Switch to a controlled BOV like Topgunz kit and I imagine the power would be very similar.


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes

GUTCH

I guess I'm reviving this thread.

I was under the impression that a smaller pulley creates higher top end power but less low end torque.

Averying

A smaller pulley on the SC means that it is spinner faster at all times, so you’ll be building boost at a lower RPM compared to a larger pulley… thus more low end torque. Theoretically this also means you have more boost at high RPM too, but the TSG Rotrex kit opts to bleed off additional boost at higher RPM and have constant boost after some set RPM. This would mostly be to protect the engine.


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes

GUTCH

Interesting.

I read or watched somewhere that a smaller pulley while producing more power by spinning faster is harder to spin. Similar to a higher gear on a bike. And that results in less low end torque. Is that incorrect?

For example here's a source: https://www.aimsindustrial.com.au/bl...ey-speed-ratio