I went to Knolls UT today with the Pulse Charger installed. Knolls are a sand/dirt mixed area. Lots of high speed riding. Desert racing style. Whoops for days if you want, technical sage brush dodging trails, hill, and most important for today the dry lake beds for miles, which is adjacent to Bonneville Salt Flats. We were headed there, but the salt was wet, the dirt absorbs it better. There is still a lot of salt in these lakebeds, 100% traction.
My set up consist of:
96mm JE 3 Ring 13:1 470
HRC Cam
DAB head mods
FCR40 155 main jet 4200 feet elevation
14/38 gearing
Stock rear 20x10x9 Ohtsu radials
LRD and PC pipes , the LRD is a bottom to mid pipe.
I jetted it and found a 158 to be the best, I still get a bit of black build up on the tail section, very little. But the plug (I bought 3 new ones to use) looked really good at 158, and it felt the best in power. This is a bit richer than I would have thought considering the elevation I am at, but it was a very good day for air, and I run a K&N with no box, so maybe I get a bit more air?
Anyway it was good and ran flawless.
I am still a bit new to this engine, and had not ridded it there yet, so at first I thought, this feels good it pulls hard. I reached the rev limiter in 5th pretty easily. GPD top speed averaged after many runs, into wind, across, with wind, whatever. 78.9mph. I guess rev limiter is all your getting. I could tell I could get to the limiter faster with the wind maybe 5mph, but I could still get there fairly easy into the wind.
I raced my buddy with a cam mod piped YFZ and had a good idea of the distance after many runs. Can't really tell you a length, but it was more like how I pulled from him. He reached a top speed of 71 with same gearing and same size tires.
This riding area has a lot of sand riding but no big stuff, so it’s always a nobbies place. It kind of felt weird at slower speeds. Kind of like I had less torque. Wheelies were a bit more difficult than I remember (I do have a new +2.5" swing arm), but it felt off a bit (make sure to read below to hear why). It still ran GREAT, the fastest of anything on 2 or 4 wheels, no doubt.
I went and ran the LRD and got it to a 168 main jet. It felt pretty good, and kind of felt a bit better on the bottom, wheelies were a bit easier, ect. Not a bunch, but I felt it. I took it to the lakebed. I can still get 78.9, rev limiter in 5th no prob. But it was measurably slower getting there. I wish I had a way to measure. Especially notable into the wind. I raced my buddy, I still pull away, and never stopped pulling, but it’s a lot closer now.
I went and put the PC back on. It felt lots better than at first, the LRD was fresh in my mind, and I could tell this was pulling everywhere better. I figured out my low-end thing, the tires were simply lighting up! Too much torque, I had to let air out of my tires, once I did that (I did run the LRD with less air in my tires later to make to be sure, it actually slowed down my acceleration).................
HOLY COW
There is NO COMPARISON.
This pipe is amazing. Low end to spare, and on top, its hard to describe, but it pulls and pulls and pulls.
I went back the lakebeds and raced. YFZ guy messed with tires too, so we had the ideal traction. I greatly increased the speed I pulled away from him. I hit the limiter in 5th as fast as 4th. 79 mph. Its bad *** to go 79 mph and have the power to turn it pretty sharp, and it does not fall off. With the LRD I had to shift to 4th to keep the back end loose at speed. With the PC I could wheelie in 5th with not a huge bar input. I was riding 4th gear 63 mph wheelies for a mile. The throttle control with that pipe is so good. Its making power everywhere, I could ride low wheelies or high wheelies, whatever I want, at 60 mph!


Sound, it’s quieter than my LRD all the way through the top.

This pipe is worth the hype, wait, and price.

 

Nice report Kam! Glad you like it and I hope it works out real well for ya. Let us know how the looks and materials hold up over time... again, nice report

 

Sounds like the other reports I've heard from other riders.
How do you explain the lower HP and Torque numbers?

 

thanks for the report.

 

i would guess if you ran all those exhausts in a different order you would have different winners and losers and everything in between. there are so many variables on a dyno that its just hard to compare 8 pipes on the same bike over the course of a day. those guys did a great job and the curves are the most important part of the dynographs for me

 

2Fun,
if you look at the curves, you see that the PC is the first to hit 40hp and last to lose 40 hp (never). So it all makes sense to me. Peak HP numbers are really just a marketing tool or a baseline if your shootign for peak hp numbers.
Besides , I could care less what a dyno says, I care how much faster my quad accelerates, pulls, ect. I know the PC does this all in spades over the LRD.

 

what graphs you guys looking at????

 

I agree that accereration is key.
I DO however find it hypocritical that the same same people who owned these pipes, and wanted to see these dyno runs, are now saying that they don't care what the dyno readings give.

The PC may have had a good torque curve (first to hit 40 and stay above it), but it was NOT the pipe that produce the MOST torque. The PC was beat out in BOTH HP and torque.

I don't think anyone is saying it is a bad pipe, but it is DEFINATELY not giving the 10-15% more power than any other slip-on as advertized.

650-700 bucks is a HUGE amount of money to throw out for a "good" pipe that did not take the top honors.

I hear people who have these pipes saying they could care less about the dyno readings, yet had the dyno readings been what they had expected (been told), you know as well as I do that they would be using that as PROOF that their PC was a better pipe. I find that a lot of these people seemed to have lost their objectiveness simply b/c they own one of these pipes, regardless of what the raw data from the Dyno shows.

I am still fence-line as far as the PC goes. I am not ruling it out, but for that kind of money, I am going to stick with my DR. D until I see first hand that all of the hype is true.

 

2 fun,
I agree 100% with everything you said, except one thing:
The Dyno did prove to me that the PC was a better pipe. It pulls very hard very early, and keeps pulling very long.

But your right, there was lots of hype, lots of anticipation about this pipe. (not from me, I did not even know the test was going on that day, I called mixxer and told him I was cracking a beer and celebrating how well the pipe performed, he told me no beers for him , he was too stressed waiting for the test results, what test?, I said)
I know your not arguning, and I am not either, so take this as just conversation.

I have paid $500 for quite a few pipe systems, in fact the LRD I currently have was $475+ shipping (+$35 more for the spark arrestor). I know that there is nothing I can do (not just bolt on, but anything) that would give me the increase this pipe did in performance, botton, mid and top for $150. So I figure if you can when you buy a pipe, get a bit more for the next $150.

If I had a decent pipe already (and you do) and was thinking of adding just the pipe, I would not do it. But if I was in the market for a new pipe and was considering a $500 pipe, I would definetly think hard about dropping that other $150 in the PC.


I don't necessarily think hypocritical is the best word to describe what people are doing.
Anyone who discredits these dyno runs is ill informed. However, those discrediting peak HP and TQ numbers as the stats used to pick an exhaust shootout winner, are spot on.
The 15% numbers advertised are at over rev. Not peak. Did you look closely at the graphs to make sure that was not happening before you posted that it was definetly not? I have not, I just now that the number you quote is as over rev(advertised)
, not peak .
Over rev is very subjective position in realtion to the main jet , I believe that "dialing in the jetting" which was not available due to time, they ran the same jet (180) in all pipes and a 170 in the PC, would yeild different numbers for each pipe, not just the PC. I know that they all read good on the AFR, but were not dialed in all the way. Mine was fine on the pulg chop, but it picked up more power with a change in jetting. I re jetted 5 times before I was happy, and the plug looked EXACTLY the same every time.
Its kind of weird that he HMF makes the most power withe quiet core, while HMF will tell you that it makes less power. That tells me that jetting was not exact. There is no explanation as to why the HMF less power pipe (they will tell you this) made more, besides jetting being on for that pipe and not for the non quiet version.

More later.....

 

Pulse Charger hummmm i wonder how they would be on our YFZ....