JHM B7 RS4 Downpipe and Cat-Back Group Buy on Audizine

B6/7 S4/RS4
#55

IMHO I think Daytona would benefit from the exhaust even more in his road race superstar racing. It’s ridiculous to compare peak gains on a dyno to decide what performance you will pick up. Road racing will put him in higher RPMs 90% of the time and honestly those are the areas where a free flowing exhaust will shine.

For someone who thinks he knows a ton of things about road courses…tires, suspension…performance gains should be just as important. The 1/4 mile is really only an acceleration tool to compare performance it’s not the end all be all like most people think AR is about, but it shows a hell of a lot more than a dyno if your only focused on the peak hp/TQ numbers.

#56

I think the forum would benefit from hearing Daytona tell us his impression of the epl tune since only him and I believe rs4power and one other guy have it that we know of.

Rs4power was one of the crusaders for custom tuning who died on his sword on that topic even after the forums let him know that custom tuning for catback was not even remotely necessary. The other guy was the epl test car, so neither of them are likely to give much of an impartial review…

That leaves Daytona. So…?

#57

I must admit that you do often offer hours of amusement but it certainly takes sifting through 80% of your bullshit to find the 20% of value you add here and there. Someone simply questions something and you turn it into an attack bc I don’t have the same exact ideas as you. I did not buy a Milltek clown, it came with my car. I’m sure with the hours of internet searching you do all day that’s something you could have easily figured out. I have not seen any data that says dp’s alone will add x acceleration, which is simply all that many reasonable minded people look for. The delta from specific mod’s whether ur using 1/4, acceleration, or dyno’s. There has been nothing that I’ve seen to compare the varying individual component gains.

And no euro, I’m not only focused on peak numbers. The area under the curve is what will often determine real world performance. But I’m sure you already knew that and just wanted to pile onto Bob’s bandwagon so I’ll let that go. Delta through the power band is essentially what acceleration tests will show anyway.

#58

Your latest beauty…while advocating reviewing dyno sheets vs. standardized acceleration tests, you said

‘The area under the curve is what will often determine real world performance’

So you would prefer to look at a dyno to tell you what the real world performance will be…instead of just testing real world performance!!!

As for measuring performance of just a downpipe, the stock tuning parameters don’t take full advantage of just slapping on a downpipe mod without a tune that has the range to beiinefficientficientit from the flow. A good tune with parameters that can take advantage of your modlist as it grows is necessary. In this case 1+1 = more than 2. Measuring what 1 part does on it’s own is really rather supernumerary.

Anyway, why not show the forum about something you do know, which is the EPL tune.

#59

So once again, where is the acceleration data for adding dp’s alone? I already explained a couple posts ago that the net gain for all components would be greater than the individual component gains. Sometimes I wonder if you just choose not to read before you comment or if reading in general is an area of difficulty for you.

I guess maybe I’m crazy for thinking this, but it’d be pretty nice to see something like

stock= x acceleration from 3-8k rpm
dp’s=x acceleration
dp’s+cat-back= x acceleration
dp’s+cat-back+tune= x acceleration

#60

Sorry but downpipe only data makes no sense. Why would you add 2.75" downpipes to a smaller catback whether it be stock or milltek? and waste the time testing that combo? If anything I could see guys buying the catback and doing piggies like they do on the S4, then upgrading to DPs later on.

In your case you mention $3k, but it seems like your only interested in DPs and you did compare peak numbers when you were commenting on $3k for 10-15whp.

What is you plan? To buy DPs alone mated to a Smaller diameter milltek catback? Why not buy full JHM system for $2750, sell your milltek (that was free to you) for a decent amount to recoup some of the cash and have a nice setup that is the best on the market? If you find away to argue that suggestion then I don’t know what your really looking for besides arguments.

Did EBwerks put out DP only data? Or just full system data?

#61

Great question eurocode. Has anyone ever, anywhere, bought downpipes only for their car and nothing else? I mean in the history of RS4 owners?

The only people looking for 2.75" downpipe only data on a car that leads into a restricted smaller diameter catback section with a stock tune are people who are looking for arguments and have no intention of actually buying anything.

Or supersprint lol.

#62

Dude, eurocode…that’s worse than a racial slur…lol

Gibson should just breakdown and use that damn gift card he has…

#63

lol autocorrect on my phone

#64

:slight_smile:

#65
#66

It’s a big one. See the notes section…

http://i375.photobucket.com/albums/oo193/sakimano/untitled-31_zps7e9c88fe.jpg

To that end, he has done a great job here showing us how in effective the milltek exhaust is. He had intake spacers and piggies, just like Mistro. Let’s see how they stack up lol

Mistro 12.47 @ 113.7
vs
GibsonlDaytonaRS4 13.10 @ 107.9

#67

Thanks saki for graciously deciding to unbann me again o mighty one.lol First I had an EPL
tune, now I have an APR? But don’t worry, whatever saki says is true so don’t worry about it.
And yea, having gone down a drag strip a total of 4 times in my life a 13.1 is my best. Unfortunately
I was not amused enough by the experience to keep running. Now a road course on the other hand,
u can compare me to any RS4 anywhere that you’d like. Supercharged or not. But what any of this has to
do with looking for data is beyond me. Im sure one day you will all decide the childish games
of trying to attack any and everyone get tired and actually be more concerned with the platform.

#68

Only 4 times? I remember you talking about doing AWD burnouts in the water box…and that was you offering advice to other members…yet when we glance at your times you fall back on the inexperience.

Forget about the banter…why not do what I said…buy a full system and sell the milltek

You are looking for senseless data, like we have already said…go ahead argue that showing DP only gains aren’t senseless for JHM. Name one other company that provides that data.

#69

^^^ has nothing to do with me. Site owner god should be thanked, however I believe you are well on your way to another suspension with your karma being where it is. Your karma originally got you banned…in other words the members of the site voted you out. Remember why? Remember all of your crazy bullshit? If not I’ll send you a few links.

Damn that APR tune…Did you used to have APR when you first bought it? I thought you were stock tune when you went, but I can’t remember. That’s an error that I’ll fix. APR probably want to slap me for that. I will need to get god to delete your time and then I’ll add another. Everything else look accurate?

Now you are EPL tuned correct? Would be nice to see you go back to the dragstrip and show everyone what a great driver you are and what a great tune EPL wrote. I believe MIR is open. Step up and maybe try action rather than words.

#70

Bro, he doesn’t care about the 1/4 mile! He’s looking for a REAL world test of performance… Sheesh!

#71

This didn’t take long…

http://forums.quattroworld.com/rs4b7/msgs/96773.phtml

I’m really not even sure what fucking info he is looking for?? He thinks a 2.5"full system for $2000 will net him only 10 less whp than the full JHM 2.75" system for $3200…and it’s actually $2750 if you jump on the bad ass deal they have going right now!

Gibson said he understands about area under the curve…blah blah blah, but is so fucking hung up on peak numbers on the dyno!!

Some peoples kids…

https://dl.dropbox.com/u/92800314/Screen%20Shot%202013-03-21%20at%205.14.58%20PM.png

read the first QF response…rocket scientists over there!

[size=8pt][quote]my gains with 2.5…
high flow cats) added 17 whp / 16 tq
APR tune 13whp / 16 tq

between both downpipes and APR tune i got 30whp and 32lbs tq. i would say slightly more than that after the ECU had time to adjust, i just never went back to the dyno but, i would just say gains are probably closer to 35-40whp after adaption. i would guess catback would add another 2-5whp to the numbers above.

for 2.75, if i had to guess i’d say 6-8whp more and at the expense of less bottom end torque? i remember reading that removing the precats will slightly lower bottom torque but increase top end… i would assume bigger diameter exhaust will do the same. maybe if you have plans to supercharge later on then 2.75 might make more sense.
[/quote]
Does anyone remember Justincredible running just headers on the dragstrip and blowing his tires off the line…so much for the back pressure no low end torque argument. I know it’s a different beast, but an example of myths.

#72

yeah, I liked how he was constantly talking about not caring about utmost performance (whatever that means) and area under the curve…and then he references peak whp numbers all day on two forums

I imagine that you can get a good chunk of of the JHM 2.75" downpipes/JHM 2.75" catback by going with a full 2.5" system, but let’s look at that. Why would you?

  1. cost - the JHM system is very fairly priced. It’s 2750 right now for a full catless system. What are we comparing to…a $2000 Milltek 2.36" catback + 2.5" SSAC ebay downpipes for $400? So you’re at what…$2400? For garbage? The JHM system is 2.75 through and through and is top quality stainless. If people want aluminized steel and poor fitment to save $350, they are fools, and they and their money will soon be parted. In fact they were lucky enough to get together in the first place.

  2. quality - the JHM system is very well made, with Danny at Fast Intentions being the one putting the system together. The quality levels crush most of whats out there, yet as we see above, pricing is very similar. When you factor in the quality stainless used, the EXCELLENT resonators, mufflers and tips, and the fact that 2.75" is financially in another league to 2.36 or 2.50", you see that the JHM exhaust is pretty fantastic for what you’re paying.

  3. sound - the JHM sounds great. Frankly it’s hard to fuck up an RS4 exhaust (kudos to ebworks for accomplishing that lol). That David Brent guy in the quattrofail thread seems to be a bit out of touch. He said JHM never released anything showing the sound of the RS4 exhaust?

Hmmm…let’s have a look at their youtube channel for 4 seconds. Found it! Looks like 8,000 other people found it too. I guess we shouldnt’ be too shocked that a quattrofailer missed it. There’s like 10 cars with the JHM exhaust in this video alone, not to mention another dozen or so videos online.

www.youtube.com/watch?v=lhDcNObZLpo

#73

Here we go…2.75" downpipes with a stock exhaust and dyno…hope gibby is happy

http://rs4.thefarnys.com/amd-down-pipes/

#74

Wow euro, thanks. Valuable info for a change as opposed to a bunch
of useless bullshit from Bob. The gains I’ve seen from hi flow 2.5" dp’s
seem to be similar theough the band so Im guessing the theory must be that the
additional components must utilize the additional diameter flow potential in
some way. Wow, that was so easy. Guess the 10+ posts about nothing relevant
could have just been avoided to get to this point.