Patrick G

I installed a Magnuson Heartbeat 2300 supercharger on a bone stock 2016 C7 M6 and made 562rwhp 591rwtq.
Here's the thread from December 2015: https://www.corvetteforum.com/forums...-stock-c7.html

Recently, I added some Texas Speed 1 7/8" long tube headers w/cats and then some high octane unleaded fuel so we could add a little more timing. The results were 600rwhp and 616rwtq. This is still at 6.0-6.5psi boost.

Next we dropped from the standard 87mm upper pulley to the smaller 78mm pulley supplied by Brian from Superchargers Online. The smaller pulley increased blower speed so we were now running 8.5-9.0psi boost. Running 15 degrees of timing, we made 631rwhp and 662rwtq. With 91 octane fuel, the results would have been lower, but this shows the potential of the Magnuson Heartbeat 2300 with headers and no other mods. Very stout indeed and still drives like stock. Look at that monster torque! The dyno comparison shows the difference between the 87mm standard pulley and the 78mm pulley.

Cordes Performance Racing

so you have 15 degrees of timing in it on 91 octane with 9 psi. Am I reading that correct?

Seannyc

Would like to see you run this in the 1/4

blown81bu

wow....impressive

Patrick G

No sir. I have 15 degrees with 104 octane at 9psi. I mentioned that the timing would be less if we were running 91 octane.

With stock exhaust manifolds and cats and the 87mm pulley, the car ran 11.1 @ 131.50mph so I would expect that with headers and with the 78mm pulley, the trap speed would be 134-135mph. It's hard to ET well with a manual transmission and a track with poor prep but the mph on an 80 degree day tells the story.

LSX228R

Wow nice work! Those motors make some crazy torque. My 09 with just the A&A T Trim kit did 540/470 on a mustang dyno at 9 lbs of boost. I might have to step up to the C7 one day lol

T/A KID

The lt1 does produce more tq, but this tw gain is bc of the blower

Jason 98 TA

Great results Patrick!

BrunoTheMellow

must be nearly impossible to keep the tires from spinning with that much torque down low.

Patrick G

All that torque down low is wonderful when you're in 6th or 7th gear and you want to pass somebody. No downshifting is necessary.

2highpsi

Very nice job Patrick! At least 50 RWHP over a C7 Z06... Are still running the stock MAF/Filter assembly? At this level might there might be another 10-15 HP there.

old motorhead

I wonder if the OP can find someone to spec him a decent blower cam for that thing....

Patrick G

Yes, I'm still running the stock air filter box/filter along with the Magnuson smooth intake tube. I swapped the stock air box with a Halltech C7 Z06 CAI (it fit) and I sadly gained 0rwhp on the dyno. Same dyno. Same day. Actually, the Halltech leaned out the mixture and showed a loss on the dyno, but after I tuned it to get the air fuel back to perfection, the power was back to what it was with the stock airbox. Swapping back to the stock airbox had the power return to the same baseline. I was shocked too after all the hype surrounding the new C7 cold air intakes. I expected at least 10rwhp gain, but received nothing. I guess the stock intake with a smooth tube is not the cork that others say it is.

An aftermarket cam is always a possibility. Actually, I've been kicking around the idea of going solid roller, but there are no good options for adjustable C7 rocker arms at the moment.

old motorhead

You're considering solid lifter to spin the motor higher? Or, are there other factors to sway you that way?

Patrick G

Solid roller gives such outstanding valve control under boost that it's always appealing. Just need to decide if I want to bite the bullet.

2highpsi

Wishful thinking on my part, 10HP seemed reasonable... but not at all surprised about the change in the MAF transfer function toward the lean side, easily more responsible for power increase on a stock vehicle compared to the actual airflow increase.

I know the stock filter/MAF system flows right about 585 CFM at 8"H20, so it seemed possible that at your output there might be some benefit to increased flow. I have an aftermarket system for my Z06 sitting in the box, I'll make sure to throw it on the flow bench before it makes it's way onto the car (and dyno).

Patrick G

Flow benches may show a gain with the Halltech, but my Mustang MD 250 chassis dyno showed 0 gain in an A-B-A comparison. Tuned stock air box, tuned Halltech air box, then back to tuned stock air box. Same day, same dyno, same weather. If I had not tuned the Halltech, it showed a 8rwhp loss from being too lean.

Since the stock Z06 is very rich from the factory, this is most likely why the Halltech shows a gain in an untuned configuration. The leaning out effect is what gives it most of the power gain and a stock untuned C7 Z06.

Seannyc

Your not running meth correct ?

Patrick G

No sir. No meth. Just a very efficient air to water heat exchanger. This is a much better intercooler setup than the E-Force from my experience.

Seannyc

Nice my shop were I'm installing LT4 blower said don't need meth either with a lower pulley great results man lookin to get similar gains