Ancient Warrior

I'll start with the results. Stock 384/ 374
Headers and tune, 410/399
Heartbeat and cam, 605/512
All dyno runs at Back Street Performance.

Car in a 2009 z51 mn6 with npp
Stock block and heads
Heartbeat base kit 96 mm pulley 9# boost
220/240 .604 lift on 119 c/l +4 eps lobes
Patriot gold springs and comp pushrods
C5r chain and ls2 damper
7.96 od ATI damper pinned
Kooks 1.875 with 3" catted X pipe
Stock fuel pump
No boost a pump
No meth
Much thanks to Rich and Eric Johnson at Back Street for the professional install, pickup and delivery. I was to tackle this project my self but my old bones said no way.

scottg

Great results hats off to your tuner.

old motorhead

Nice results Keep an eye on your fueling. That stock pump has to be close to being maxed out. When it gets hot outside (and in your fuel tank), you'll be even closer to the edge.

Streetk14

I'll second that. I wouldn't attempt to make 600 rwhp without a BAP or meth. I'd be really shocked if your fuel pressure wasn't dropping under heavy load.

Ancient Warrior

Thanks for the input. I know its on the edge and plan a few more mods to take care of it. KB boost a pump , 2 bar map sensor, dash logic and possibly a 90 mm pulley.I will talk to my tuner about the changes. And yes, pressure started to drop after about 6200 rpm

CI GS

Since I was given this advice by the Heartbeat guys on here, I'll pass it on: Make sure that you get the Racetronix harness with the BAP interface. The harness alone will put more voltage to your fuel pump and the BAP interface makes it a plug and play deal.
You'll love the Dashlogic. My recommendation would be to get the new Gen 4 PLX wide band kit along with it so that you can monitor your AFR on the HUD or DIC.
Do those things first before you think of a pulley change. Most likely with that bigger balancer, each pulley change for you will result in a bigger gain in boost than if you were running a stock balancer.
Also, you may need colder plugs for more boost, depending on the heat range you're running now.

monsta01

Don't waste your time with the 90mm pulley.

Get a bap and the 81mm pulley and make 650+.

Streetk14

Some good advice above. Unfortunately, Magnuson doesn't supply a few things that probably should be standard in the kit. Colder plugs and a BAP are two that probably should be. Otherwise the kit is super complete.

I'd just use caution on adding more boost. I'm not keen on running more than about 600 rwhp on a stock LS2/LS3 short block with pump gas alone. Something like an LSA or LS9 that's designed for boost is more forgiving, but even then octane is important. I tend to follow ECS's practices and take on the boost/power vs. octane thing.

scottg

Would like to hear a sound clip of that cam. Is it normal to lose alittle rwt when cam is installed. Without cam, I"am at 528

Ancient Warrior

I'll try to get a sound clip today and posted later.

Ancient Warrior

Thanks for all the replies. If any one could give me the part# for the 2 bar map sensor and the racetronics harness, I would be grateful. I don't want to use meth or bigger injectors so my thinking is 2 more # of boost and BAP, hope to end up near 650 RHP. For now it will get cleaned up and new tires

scottg I cant get the video to load .

old motorhead

The 90mm blower pulley with an 8" crank pulley turns the blower nearly the same speed as an 84mm with stock crank pulley. At 9psi, your current boost level seems just a bit high for that pulley combo. I wouldn't expect much more than 9.5psi with the 90mm and o/d crank pulley combo.

You should be low to mid 600's with your new pulley combo. My old Vette ran (and is still running) a long time at that power level with a similar blower speed. No meth. Andy thinks you need meth at that power level. Hmmm. My experience says different....but, that guy is NEVER ever wrong

scottg

Thank-you for trying

Streetk14

Hey.... I'm wrong every once in a while.

Maybe my opinion is a little bit warped by the 91 octane we have out here. It's known to not be as good as the 91 available elsewhere -- let alone the 93 you guys have. The Euro tuners refer to it as ACN 91 octane (aka AZ, CA, NV).

You guys can probably safely get away with a couple more pounds of boost on pump than I can. Though I'm not a big fan of running low timing to keep KR at bay. It works, but it isn't the best thing for the exhaust valves or cats (if you have them).

Streetk14

Oh, and you'll want a ZR1 map sensor. GM part number 12592525. The Racetronix parts can be found here: http://www.racetronix.biz/itemdesc.a...%2D008&eq=&Tp= . Just make sure you select the $8 "Pump booster interface connector set" on the right side of the screen when you order.

I also like upgrading the Hobb's switch and connector to an adjustable version with a nice weatherpack connector, but it isn't a requirement.

CI GS

At what point do you need the ZR1 MAP sensor??

scottg

Had the same question. And why?

schpenxel

Anytime you want the computer to actually know you're in boost. Stock sensors only go up to atmospheric pressure

Depends how it's tuned though. If using custom OS / SD then I wouldn't tune one without it. If using MAF only, doesn't matter

Ancient Warrior

I want the 2 bar so the Dash Logic will read boost.

Ancient Warrior

Tried once more. Seemed to lose half the clip on upload.