A lot of people have been asking me about my numbers and I haven't posted yet. I've been reluctant because I don't have a "final pull" with a fully charged IMA battery, nor do I care. I only have the tuned graph with depleted IMA battery. I also didn't post because the numbers seem high. Bisimoto did my tuning so I trust that these numbers are correct.
My CRZ was tuned by Bisimoto. Bisi is an absolute engineering genius and his approach to tuning the Sprintex was a feat to watch. We had to do everything from scratch. I am VERY satisfied with how the car feels. As some of you have followed, I took a different approach for the Sprintex install. I did not use the supplied piggyback ecu at all. Instead, I chose to go with the K-Tuner End User System (thanks
@KamiSpeed). I went in for 2 tuning sessions with Bisimoto. The first session consisted of setting up a base map from scratch and seeing what we can improve on. I went home, took apart the Sprintex, made the adjustments per his recommendation and also had custom work done to the piping of the exhaust system. A week later, I came in for the final tune in an attempt to extract the most power out of the Sprintex. The best way to tune the CRZ is with the IMA depleted. I did not do a final pull with the IMA charged. The time it would take for the car to charge up the IMA + cooling the engine down was going to take too long. An ego booster is not worth my time nor money. (I was already at 7 hours of tuning the Sprintex from scratch). I decided to opt out because the numbers didn't matter too much to me. The most important thing to me was having a boosted car that was tuned properly, safe, and most importantly, reliable.
FEEDBACK
I am very impressed with the Sprintex supercharger. The whine was not as loud as I was hoping but I achieved what I wanted to achieve--to reach numbers similar to that of JR and HPD. Not quite there but close enough that keeps me content. The most impressive change I see and feel is the torque. Huge difference. My entire mid range just opened up a whole new world. We did 3 pulls back to back (listed in order, minutes apart) and it was very consistent: 150.25 wtq, 150.42 wtq (pictured below), 150.20 wtq (pictured below). The last two runs are shown in the dyno below as solid red and green. You'll notice a huge shift in power from red to green on the HP side. This shows that the Sprintex supercharger is VERY sensitive to heat. We let the engine cool down 2 minutes and did another pull with depleted IMA. We quickly gained 10 whp back in ONLY 2 minutes. That is the downfall of the Sprintex supercharger--heat/heat soak. A cold air intake is highly recommended to avoid prolonged heat soak. A vented hood is definitely highly recommended as well. My FEEL's Honda Twincam hood was selected for two very specific reasons. It has raised vents to extract heat from the engine bay as well as serve as clearance from the supercharger. I have not had any bangs or rattles between hood and Sprintex. I also installed engine mounts to keep the engine stable.
One of the craziest things I did not expect was the MPG. It's so insane, I almost don't even want to say. I've filled up my gas tank twice since the tune and.... I've been averaging 50+ mpg. I will provide pictures if needed. Boosted and 50+ mpg? WOW. There has to be something wrong but I'm not sure what, lol. Others have been telling me they are getting low 20s. I assure you, I've been driving the Sprintex hard. The only changes I've had to make during a regular drive was to be lighter on the throttle due to higher torque in low to mid range. At 70 mph (regular freeway speed in CA), around 3K rpm, I'm barely touching the pedal.
The Sprintex supercharger is holding up very well. I've redlined my CR-Z over and over again and no issues. Zero knocks/pings/misfires. I've driven and monitored aggressive driving on my laptop via K-Tuner and still nothing. The torque is very noticeable and the car drives so smooth. I am a very happy Sprintex owner.
Last thing, I did mention it briefly up top, the whine was not as loud as I was expecting. It's there, but only in the latter half of the RPM band. My exhaust system overpowers anything in the lower to mid range. I've been through the canyons and all the power is usable. It's a great feeling. I love hearing the whine, but I don't hear it enough. In fact, it's very discreet. I don't think anyone would know I was boosted unless I floored it. I can drive around all day long and not hear it whine at all.
Enough of my feedback. Below are more details on the modifications I had to do to make this work and also the final numbers.
MODIFICATIONS TO STANDARD SPRINTEX INSTALL
K-Tuner End User System
Relocated MAP Sensor
Modified BLF Cold Air Intake
Bored/Ported/Polished Sprintex manifold and elbow
Spoon Venturi Big Throttle Body
J's Racing Circuit Converer
Custom enlarged exhaust piping w/HPD Sports Exhaust System
RDX 410cc fuel injectors
Tuned for 91 octane
Results:
NO IMA
Max Power: 138.39 whp (164 HP)
Max Torque: 150.20 ft/lb
I'm not exactly sure how much a fully charged IMA will yield but these are my best guessimates per
@kaytwozero's method on his build thread. I've searched for more dynos with pre and post IMA tunes. The average that I found was +25 HP and +25 TQ. Taking that into consideration, the below should be the approximate of what my CRZ is putting out.
This is all theoretical.
--------------- THEORETICAL ---------------
IMA
Max Power: 138.39 whp
+25 IMA = 163.39 whp (192 HP)
Max Torque: 150.20 ft/lb
+25 IMA = 175.20 ft/lb
Conversion to Crankshaft Horsepower
Wheel Horsepower to Crankshaft Horsepower Guestimator
FINAL NUMBERS
(Engine + Electric Motor)
Max Power: 192 HP @ 6100
Max Torque: 175 ft/lb @ 2500
(Engine + NO IMA)
Max Power: 164 HP @ 6100
Max Torque: 150.20 ft/lb @ 2500
Like I said, these numbers seem very high which made me hesitant to post. Take it for what you will. Please note that this is on a Dynapack. I have read that these dynos read higher, but I also read that it's best for tuning DDs (daily driver).
Included in this dyno is a stock CR-Z with a fully charged IMA for comparison.
104.23 whp = 127 HP (STOCK)