Supercharger Upgrade SCI -> SI

DrBacon · 06-10-2022, 12:07 AM

Quote:

Originally Posted by NissanTracker

Yeah... the HR on 93 pump gas will only go for 12 psi safely. I just want to shift the power curve to the left. I don't see why a manual boost controller just set to 12psi shouldn't do it. But, there are some cool features on those Greddy Profecs... not sure if I actually would use them though.

That's effectively what the Rotrex kit does, just spins the blower at full potential using a wastegate to limit the additional boost resulting in moving the entire boost curve left. The exact same thing can obviously be accomplished with a vortech kit as well. The SI would get you part of the way there but a TI trim blower would be more comparable to the Rotrex in terms of CFM.

redondoaveb · 06-10-2022, 12:50 AM

Quote:

Originally Posted by DrBacon

That's effectively what the Rotrex kit does, just spins the blower at full potential using a wastegate to limit the additional boost resulting in moving the entire boost curve left. The exact same thing can obviously be accomplished with a vortech kit as well. The SI would get you part of the way there but a TI trim blower would be more comparable to the Rotrex in terms of CFM.

I don't know how well the Ti trim works on an hr but it didn't work worth a sh!t on my vhr. It gained a ton of boost but lost power and torque. Had to go back to the Si volute and impeller to get the power back

NissanTracker · 06-10-2022, 11:10 AM

Quote:

Originally Posted by DrBacon

That's effectively what the Rotrex kit does, just spins the blower at full potential using a wastegate to limit the additional boost resulting in moving the entire boost curve left. The exact same thing can obviously be accomplished with a vortech kit as well. The SI would get you part of the way there but a TI trim blower would be more comparable to the Rotrex in terms of CFM.

Yeah...i saw that as well.

NissanTracker · 06-13-2022, 08:48 PM

Quote:

Originally Posted by redondoaveb

I agree, a manual boost controller should be fine for your situation.

What size external wastegate did you end up with? I'm seeing anything from 38mm, 44, 46, 50, 60. Finding aluminum flanges seems to be a challenge as well. I'm trying to find something that is the same size as the 50mm Tial flange.

redondoaveb · 06-13-2022, 10:35 PM

Quote:

Originally Posted by NissanTracker

What size external wastegate did you end up with? I'm seeing anything from 38mm, 44, 46, 50, 60. Finding aluminum flanges seems to be a challenge as well. I'm trying to find something that is the same size as the 50mm Tial flange.

It was a 44mm. We tried a 60mm at first but it didn't work right. I guess there's an issue with dumping boost too quickly.

NissanTracker · 06-14-2022, 09:08 AM

Quote:

Originally Posted by redondoaveb

It was a 44mm. We tried a 60mm at first but it didn't work right. I guess there's an issue with dumping boost too quickly.

Haha... I ordered a 44 and a 60. will Cancel the 60mm.

redondoaveb · 06-14-2022, 10:23 AM

Quote:

Originally Posted by NissanTracker

Haha... I ordered a 44 and a 60. will Cancel the 60mm.

Definitely cancel the 60

NissanTracker · 06-14-2022, 08:09 PM

Quote:

Originally Posted by redondoaveb

Definitely cancel the 60

I had that thought about the wastegate dumping too much air with the 60mm and got the 44 just in case. Thanks again for the info!

Will report back.

redondoaveb · 06-14-2022, 10:02 PM

Quote:

Originally Posted by NissanTracker

I had that thought about the wastegate dumping too much air with the 60mm and got the 44 just in case. Thanks again for the info!

Will report back.

You're welcome. Happy to help

NissanTracker · 06-23-2022, 12:23 PM

Actually curious, when the wastegate opens up when boost is reached... does it get loud? I was annoyed with the 50mm Tial bypass valve and ended up putting a recirc + silencer.

NissanTracker · 06-23-2022, 12:23 PM

Quote:

Originally Posted by redondoaveb

You're welcome. Happy to help

Finally just found an aluminum flange for the 44 mm wastegate. What a pita. I went through 3 different sets of V band flanges... only to realize that the Tial wastegate needs a specific V -band style.

Automods.com ended up having it... i grabbed one from ebay:

https://www.ebay.com/itm/281725022922

apparently this is a popular honda mod for high end turbo drag cars. They use the wastegate for launching....

redondoaveb · 06-23-2022, 02:13 PM

Quote:

Originally Posted by NissanTracker

Actually curious, when the wastegate opens up when boost is reached... does it get loud? I was annoyed with the 50mm Tial bypass valve and ended up putting a recirc + silencer.

Nope, not loud at all

shawnberry45 · 08-31-2022, 09:29 PM

I actually just had this upgrade done recently….. finally hit 10lbs with a filter in 92 degree summer heat lol. I’m on V1 TopGunz kit. Previous only saw 8lbs with filter… so happy with the upgrades so far. I’m also on a 9LB pulley.

Midrange is a lot better! Hard to describe just easier to drive quicker into boost

Quote:

Originally Posted by NissanTracker

Hey forum,

I run the TopGun V1 supercharger kit after going from the default SCI setup Stillen offered. According to Vortech, the V3 SCI flows 1050 cfm whearas SI is 1150.

I am trying to gain a bit of more "usable" power in the low to mid range and this is my last stop. Has anyone actually done some SCI -> SI trim upgrade and what was the experience like? Was it worth it?

thanks!

-NT

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06-23-2022, 12:23 PM	#25 (permalink)
NissanTracker Track Member Join Date: Jun 2016 Location: Massachusetts Posts: 724 Drives: 07' Nismo, 14' Nismo Rep Power: 29262	Actually curious, when the wastegate opens up when boost is reached... does it get loud? I was annoyed with the 50mm Tial bypass valve and ended up putting a recirc + silencer.