[laynlo15]

Originally Posted by airtroop01

I thought I would post up my results…
While I have a V3, I’ve lurked on here for technical advice and thought I would pay it forward.

I could share why I went this route but, I am in California and if you know, you know…I’ll save the why’s for the comments section and get to the journey.

Before setup:
Stock V3/LT4 w/ 16,000 miles
RotoFab intake
Soler TB
Borla catback
Car ran solid to me.

After setup:
Magnuson 2650R full kit with tuner
103mm snout
103mm NW throttle body
RotoFab BigGulp
Elite e2x catch can
Stock headers
Stock cats
Stock fuel system
91 octane CA blend crap $5+ a gallon gas

I have done blower swap kits before and generally enjoy a decent project in my days off around Thanksgiving. However, I had herniated a disc in my back recently so I had JRG Motorsports do the installation and Newtech Performance do the tuning and dyno… a decision that I was happy I made….more on that later.

The intent was to:
1. baseline dyno to see where I’m at
2. Install base Maggy 2650 kit and emissions pending tune and dyno
3. Install larger snout, TB, RotoFab and dyno

The stock dyno was a bit disappointing. 507/560. Torque number was within range IMO but, it looked like the computer was pulling timing on the top end. I’ve seen similarly equipped cars pull 563/566. I was glad I got a baseline so I had something to compare to later.

Installation initially went smooth; the kit is well equipped and everything is in the box. The motor was hot and JRG cussed at the hot disassembly while I took pics. The only special work was to trim the valve covers in order to relocate the coil packs. The blower went on easy and it was time to fire it up. I didn’t notice earlier that I needed to contact Magnuson and send the stock tune in the mail… so trying to avoid waiting another day… we cut step 2 out and went to step 3 with a custom tune so we could get it back on the dyno. The car had some issues starting but eventually came to life.

We got it to the dyno to start getting the tune dialed in and that’s when the problems started. Idling seemed fine but as soon a load was put on it, the car would stumble. Logs showed that the high pressure side was delivering half of what was commanded. Fiddling with the tune, looking over the install, debugging runs to see if things changed…. No improvement. Put a gauge on the low pressure side to see if things are healthy. Yep, we are getting good pressure.

Days of frustration resulted in replacement of the high side pump, fuel pressure rail sensor, scouring the boards to see if anyone had a similar issue, taking the blower back off and inspecting the entire system including pulling lifters to see if all is right. Turns out just with 16,000 miles a stock low side fuel feed hose with a check valve inside can go out on you… I can’t emphasize enough how frustrated we were. Anyway, now with the blower back on… she fired right up. Back to the dyno….

Fuel pressure good. Let’s go!
673/614 - cool, now we’re talking
678/633 - even better
Knock sensor was indicating some activity and pulling timing. She still wanted to make power. We decided to shut it down and safely back the timing off since I had no octane boosting methods (e85 or meth or race gas).

So there you have it. Here’s what to expect from a 2650 on a stock-ish motor and 91-octane pump gas. I got a 171 hp gain. If my baseline was what I expected, it would have still been a 115hp gain. So, I am happy. Because the knock sensor is pulling timing, 93 octane and/or meth would have increased the power considerably. I expected these power results given headers/cats/fuel and we hit it exactly. Cooling on the blower is insanely better… it’s going to be so much better on the track. I can tell already in traffic it’s much better. I am glad that I didn’t do the install myself. Was I unlucky - yes - but I wouldn’t have been able to debug that check valve solo. More than likely I would have towed it to get fixed.



What’s next? I am getting:
e85 sensor
Cordes low side fuel setup
Toohighpsi fuel injection plates
60lb Siemens injectors
MAF Fusion controller

Those are great numbers and much more power to come. Congrats on a nice build.