Dinan Supercharger efficiency upgrade, good to go.

[J.Belknap]

Vortech has (about a year ago) released the more efficient V-2 SQ Si-Trim Supercharger to replace the legacy V-2 SQ S-Trim Supercharger.

Here is Vortech's press release with relevant data.

The unit flows more air, and I was not sure if additional fueling was needed.

Here's the answer from Dinan:

Originally Posted by J.Belknap

It's about time that the Vortech V-2 was sent in for refreshing.

The word is that the head unit would be brought up to "Si-trim" specifications.

Will this increase in airflow require more fuel (duty-cycle, injector, or pump)? Or is the tune/fuel components conservative enough to allow for this?

Thanks!

Originally Posted by Dinancars

Vortech says the “Si-trim” impeller is a little more efficient than the “S-trim” impeller, which allowed them to raise the redline from 50,000rpm to 52,000 rpm (see attached). The kit on your car runs between 3500rpm - 35,000rpm. This is determined by engine rpm, the pulley ratios, and the step-up ratio inside the blower, none of which changes with the upgrade. In this moderate operating range, they’re not expecting any detectable performance difference, so no tuning modifications are needed. Safe to go for it!

Also, I've attached a supercharger comparison chart from Vortech.

[chilliwilli]

I like your style...

[m5james]

So are you going to replace it through Dinan or some online site like www.superchargersonline.com? While I'd rather have a nice and loud S/C instead of the SQ series, I might be interested in taking your S-trim off your hands

[bigfish]

Interesting info... for me I'm not sure the modest increase would warrant cost. I went a different route, I took mine (03 4.6is S3 originally done in 2005) back to Dinan in Menlo Park and talked with Steve. We decided the best bang for the buck to increase power/torque was to cut the pulley wheel. This boosted the pulley wheel rpm's and output of charge from the Vortech V-2 I currently have on the car. They had to re-map air to fuel and do some additional fine tunning. Overall I was happy with the modification.

bf

[J.Belknap]

Originally Posted by chilliwilli

I like your style...

Just throwing it out there, hope the info comes in handy for someone.

Originally Posted by m5james

So are you going to replace it through Dinan or some online site like www.superchargersonline.com? While I'd rather have a nice and loud S/C instead of the SQ series, I might be interested in taking your S-trim off your hands

Directly through Vortech. I'll call them and get a return authorization. The Dinan kit bracket is designed for a Vortech V-2 (SQ), so quiet and stealthy is the only option. I believe you "can" have the gears changed to a straight-cut T-trim style in the V-2 case, but not sure/don't care too much about noise for a daily driver.

The cost of the S/C rebuild is about $375.
The cost of the S/C S-Trim to Si-Trim conversion is about $350.

Originally Posted by bigfish

Interesting info... for me I'm not sure the modest increase would warrant cost. I went a different route, I took mine (03 4.6is S3 originally done in 2005) back to Dinan in Menlo Park and talked with Steve. We decided the best bang for the buck to increase power/torque was to cut the pulley wheel. This boosted the pulley wheel rpm's and output of charge from the Vortech V-2 I currently have on the car. They had to re-map air to fuel and do some additional fine tunning. Overall I was happy with the modification.

bf

Hey bud, how have you been? I think you have a PM that I sent a while back. It would be nice if I were out on the west coast, I wouldn't mind stopping by Dinan's shop for the cut pulley / tune upgrade. (Dinan stage 5 software? LOL)

Vortech keeps all the old stuff, so make sure you don't send them the pulley with the S/C.

I think that with the ~$750 spent on this refresh, there will not be much more peak power, but definitely more area under the curve.