I just got JHM tune. Anyone else have it?

A5/S5/RS5
#1

I just got the JHM tune for my 2009 S5. Anyone else here have it? It’s awesome. It makes my car seem like a new car b/c I was actually bored driving this car and it sat in my garage all the time. I have a daily b5 stage 3 s4 that I enjoy driving more because it has a lot more power.

Anyhow, the throttle response is much more responsive especially in the 1-3 gears – I have a manual. Sometimes I jerk around the first gear like someone learning to drive a stick for the first time b/c the power is better and quicker. I don’t know how much more torque or HP it gets (anyone here have a dyno or other info) but I feel more “butt in the seatback” feeling than before. I also didn’t see a drop in gas mileage after driving it really hard and filled up yesterday and got 16.5 mpg with driving really hard which means my gas mileage may be better (??) thank stock. I have only had one fill up so that’s not much data though.

The only mods to my car are e codes, coil overs, AWE s flo intake and milted non resonated exhaust. I don’t have JHM high flow pipes or test pipes b/c it costs too much labor to remove the tranny to install those.

Anyhow, anyone else here have JHM tune? Anyone record their new 0-60 or quarter mile or dyno it?

#2

I’ve been impressed with the jhm offerings for our cars. You’ll find the tune seems to get more tailored to your driving style when it settles. The power curve is more eager to please and distribute power on demand.

Have you tried out the launch assist feature of the jhm tune yet? That’ll impress you while improving your driving skills. I know it did mine.

It might be something to ask jake@jhm about, on the upper section of the exhaust. I don’t believe you need to remove the transmission to install the exhaust.

#3

That is really, REALLY good news. That would affect a night and day change in driving pleasure of that car.

#4

If it is like the RS4 tune, you may see this relax a bit after 2-300 miles.

Mine was extraordinarily sharp after installation, and then less so after a few hundred miles. I believe the default settings are a bit aggressive, and then allows the car to self-tune to a safe and stable state.

#5

^^^that sounds weird. Sure you’re just not used to it?

I used to think my stock B7 S4 was retarded fast. Then it got normal after a while and when I got tuned that was a new world of retarded…which also felt normal after a while. I think with time you just get desensitized

#6

The tune does adapter a bit, but typically the user because used to the responsiveness of the throttle. If you were to go back to a stock tune it would feel weird and unresponsive, lol.

#7

Saki - 100% positive. The tune also started with some light knock, which disappeared over the same period of time.

Jake - No doubt. It was a freaking huge difference from stock to the tune. The “adjustment” of the tune felt slightly disappointing… but I’m positive is much better than stock.

I’ve also confirmed the elimination of the throttle restriction, which is fabulous!

#8

I don’t get the ‘disappointment’ thing. That can’t be accurate.

i.e. Mistro got JHM tuned in like summer of 2012. In spring 2014 he went to the dragstrip and went 12.21@113.2. He is running the JHM 93 octane tune, and hasn’t changed the tune in 2 years…i.e. no revisions etc.

If what you’re saying is true he would have run faster in summer 2012 (all else being equal). Same goes for user ‘2000S4’…he went 12.28 @ 112.45 about 18 months after getting tuned.

As for the knock it’s not like the parameters of the tune changed so that makes no sense. The reason there is no knock now is because

a) you’ve done maintenance improvements to the car
b) you’ve finally made modifications to the exhaust and the cats
c) you’re running better gas (not sure on this, but octane is a big determinant of knock likelihood, and a batch of shit gas can send your car a pingin)

It’s not because the requested timing parameters have magically changed.

Maybe CV can chime in to help clarify some of this.

#9

This tune is awesome. My car still feels good a week later. I still jerk around sometimes in the first gear b/c of improved throttle response that my mind hasn’t adapted to. The power seems much more in the 3k rpm range.

The only thing I have noticed is that my idle RPMs feel slightly rougher. I don’t see the gauge move, but I feel the engine changing very slightly in RPMs at idle.

I’m still curious what the dyno changes are. I bet you would see increased power and torque in the lower gears and in more useable RPM ranges.

#10

To be clear - I am happy with the results of the JHM tune. I discussed my upgrade path with CV, who is a pleasure to talk to. We discussed the extreme heat where I live, and how heat is particularly unfriendly to RS4s.

This may actually be an indicator why CV’s tuning is better than the competition. My understanding is that the ECU is adaptable, and can adjust long term settings. These long term settings are reset to defaults when a tune is installed, and require some driving to dial in.

In my case, I installed the tune weeks after maintenance items, and weeks before the recent IM spacers and DPs. My personal assumption is after installing the tune, it reset to defaults (which felt awesome, but had some knock), and the tune dialed itself to reach a safe place for my particular engine and climate.

As always, would value any contributions from CV.

#11

I’d say you’ve felt more of the cars reaction to the heat then the tune settling down. Personally I can feel the car is much happier when the weather isn’t close to triple digits.

#12

Glad you enjoy the JHM tune! You should install the JHM short shifter now for even quicker, crisper shifts

You need to pull the tranny for test pipe install!?

#13

Great point. It’s a swing of up to 4000-5000 feet of density altitude in some places (we go from -2000 to +3000). That’s pretty signficant…10-15% power lost.

#14

That’ll really make a dramatic impact. I don’t know how many people actually know that

#15

The exhaust studs like to break on the B8s just like some of the RS4s. It is also super tight between the transmission and the downpipes.

Whenever I change out a clutch on a B8 V8/V6 car, the cat pipes stay on.

#16

I can attest to this. One of the studs broke on my DP install. It had to be drilled out. :-\

#17

At least the oem headers reach down a little so it’s a bit easier in the rs4.

When a stud breaks on a b67 s4 it’s way way up tucked tight to the engine because of the little chokey exhaust manifolds. Awful.

#18

I don’t even want to think about a S4 stud breaking…pain in the ass.