This was a big topic when I had my modded 5.7 Hemi truck, if you want to know more about toner rings check with Stu at Inertia Motorsports at one time he was making some stronger ones but that was a long time ago
Thanks for the info. I learned my lesson from the March pulley setup so no SFI approved harmonic balancer, no dice for me.
Underpullies, sounds like some sort of hazing you do to freshman... =] I don't think underdrive pullies will help that much on a large engine like the 6.1L, it makes much more of a difference on smaller lighter engines, where that underdriven and lighter pulley makes up a bigger percentage of the parasitic losses.
Underpullies ... hazing ... lol, now that's funny!! I agree, on smaller engines it makes more of a dif. On my 5.0 mustang it really was noticable, the motor spun up much faster, it felt almost "unburdened" in a way and made a definite difference.
hi-flows are on there way! i'm pretty excited about getting them on, hopefully this weekend. now if i can find a borla muffler with a little more rumble..
Borla XR1 Race mufflers. I got mine from Summit Racing. Gives the car a nice rumble and at WOT they sound AMGish. I love em!!!
In addition to what Matt has said, we have a 25% underdrive pulley that when installed gave us a documented 14rwhp with no loss of functionality to alternators or power steering and such. The guy that got 22rwhp by removing his belt may have seen more power, but I am sure his motor was getting very hot by the end of the run due to the water pump not running. The motoblue pulley that caused all of the issues was not a harmonic balancer. There is a huge difference between an underdrive pulley and a harmonic balancer. All of our underdrive pullies are also Harmonic Balancers and they are SFI approved, meaning no harsh/unwanted vibrations in the crankshaft. The 14rwhp gain we got was from removing an ATI balancer and putting our pulley in its place. You can see the SFI certification in the second picture.
If you do an U/D definitely get one that is also a SFI Harmonic Balancer. We will be carrying one very soon that has this setup and comes from a reputable manufacturer. Initial dyno results show about 10hp/tq increases on a stock car.
I'v had two Vette owners compliment me on my exhaust; one with a modded C5 and another with a modded C6 and both stated that my exhaust is WICKED at WOT. The guy with the modded C5 has a cam in his car and was shocked at how loud my car was. (a good loud) Another Vette owner I recently enocuntered literally stopped in his tracks when he heard my car start up. The sound definitely signals bad intentions....and I love it!! SRT8 HMI told me in a PM that the Borla guys tried to talk him into not getting them because they throught they are too loud....HA!!!!!!
I guess what I am getting at more than anything else is that for the cost and what you have to do to install this is really not worth the money IMO Andy I know you guys have a great pulley/balancer and if you add this mod while doing other work like head and cam while the crank bolt is already out it might be worth it then
Subscribing for additional info. So this is not just a straight forward pulley swap ala one done on a Mustang?
I think what Andy at PPP is pointing out that with a good harmonic balancer with the addition of a smaller UD pulley you should be okay and If I am not mistaken they actually carry such a setup so I would trust the judgement of what Andy says on this matter over mine
Oh I am good and trust PPP products as I have a few on my car now. I was just looking at difficulty of install. I am having the shop that does all of my work install the pulley when I receive it and just wanted to get an idea.
Install is 2.5 hours here. Making install cost around $212.50. Thats $249.99 for the pulley and $212.50 for a total cost of $531.25. Thats $44 per hp which is better than any catback or header system. I will agree that the best time to put this on is during a cam swap of some sort so that there is no increase in labor cost. Sounds good. We are shipping yours out today.
