I looked on the JHM website at the tune, but it does not mention horsepower increase.
Has anyone documented the effect of the tune on the engine’s output?
Ed
Was going to dyno it today but got very busy. Will hopefully have numbers tomorrow before vs after
JHM Several years ago stopped doing hp results. While JHMs hp results were better than everyone elses by a good long shot posting just hp results in the past has been plauged with fraud.
Any marketing guy can MS paint a good dyno sheet. or run a dyno fix. This is what happened in the Audi market several years back. You had companies that would just claim X or Y hp only to be slower than stock when tested on the street. While I love APR their tune for the 5.2 ends up claming big hp but when indpenedly tested it made NO MORE THAN STOCK and the acceleration times are the same as stock.
JHM changed things up and starrted proving performance at the track. As lets face it. I don’t care what a dyno says. How much faster is my car. That is the end resuts we all care about. You can always lie to the dyno. You can’t lie to the acceleration test.
I saw someone else on this site that has had the chat to a mechanic to repair the small flex pipes. Apparently the mechanic could remove the Y pipe without removing the engine.
So I guess that it’s possible to gut the cats with the engine in.
Where are you from demetrius?
My biggest concern with the tune is that I’m located in Europe, so if the tune is bad, I can’t just pop by to get it trimmed. Also writing with JHM asking about the tune has left me a bit nervous as they didn’t see sure when answering.
Really want to support them, but again I also want the support that a local tuner could give.
Email the advanced tech support people at jhm. They are the ones to talk to.
I know lots of customers from 4.2 to 5.2 that are JHM Tuned all over the world. JHM tunes more of these cars in one week than most tuners will tune in there lifetime. At this point they have it worked out.
Still looking for a dyno sheet. — Here is a good read
I totally get that, but sometimes a Dybro readout is just fun. 
I read somewhere that the tune gave 55 hp.
I also read that the gutted cats would give like 50hp.
Putting it together and 105hp sounds nuts on a NA motor. But again, it’s detuned so it won’t take the shine from the S8.
Do they move the redline btw? Moving it like 500rpm could potentially give a lot on the top end.
While a dyno sheet is fun and I see what your saying. The abuse of the dyno sheet and the inconsistantcy of it has reduced its importance. Today with all of the othere aspecs of these cars there is more to the tune than just WOT… Actually having a MUCH faster better driving car IMO is better than a sheet. After all. We only really care about the dyno sheet because we expect to see more seat of the pants feel and acceleration based off the hp numbers.
The link above really puts things into perspective.
The only sheet I want is the 1/4 mile time sheet. As that shows real performane and difference for the money.
Read the full comment, and I totally get it. Don’t get me wrong.
But I just can’t pop by a drag strip here, so testing before and after a tune is just going to be on the street or a dyno.
The streets would be based on a feeling, and after paying for a tune that feeling is now biased.
On the dyno I would then need to see what I was looking for.
Again, being on the other side of the world buying a cable to get a “box tune” (I know a lot of R&D has gone it to this so don’t misunderstand that) not being able to pop by for a trim, is what’s making me nervous about buying the tune.
Just to give a perspective on what I’m coming from:
When I had my A3 tuned it was for 3 hours with multiple dyno runs and the file was trimmed multiple times by the tuner, even though the engine was a well known engine that they tuned them by the dozen every week.
Their answer was that not all engines is the same even though the engine code is the same.
Again I know, from reading here and seeing the drag slips, the JHM has put a great effort in to this but please understand what I’m coming from.
You can obtain rough WHP with some algebra or online calculators
R8 = 338 WHP
S6 = 412 WHP
Everyone uses a different empirically derived constant but using 6 as that constant is a good average value.
You can also cross multiply vs another standard car’s posted values such as the r8 above using power to weight ratio.
R8
430hp/3582 lbs = “12.8 sec”
S6
X/4486 lbs = “12.9 sec”
4486/3582×430 =~538CHP
538 CHP ÷.8 = 430WHP
538 CHP ÷.75 = 403WHP
Again rough estimates but probably safe to say the gains are visible! By no way am I providing numbers on JHM’s behalf, just math fun to play around with
Kimovitzh - Fist off I hear you back. Here is what I would say as somthing to think about
1 this isn’t a 1980s corvette. This isn’t a 1980s comptuer. Not to be rude but if it took 3 hours and several pulls the tuner didn’t know what they were doing. Or they had never tuned that car before. I’m from europe and the notion that you need to have the tune trimmed just means they don’t know what they’re doing. Espically on a simple car like the 5.2
To back up the not a 1980s comptuer. The 5.2 has an incredibly advanced ECU. With wide ban 02 sensors. So this means you don’t need to trim anything fuel wise. As the car will always make target.
The car has advanced knock sensors. So the car will adjust and move igntion per event.
You can look at it as a canned tune. But that was only an issue 30 years ago or on domenstic cars where the computers are not as advanced.
When you take into consideration that a stock S6 goes on average about 13.7 to 14.3 depending on the temps and condiionts
But all JHM Tuned cars are going 13.3 to 12.9 and it dosent matter what or where the car is at. The JHM Tuned cars have gone that fast here all over the us. Down under in Aus and in Dubi. They are consistantly doing the same things.
In the end. If you think you might need to have the tune trimmed you can always send a log to the JHM guy and see what they think. After all if you do the tune on a dyno they are going to be logging. You can take a log and send it to JHM.
In your journey to find what works for you I hope I added something to think about. As long as your happy that’s all that matters.
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Damn, that is impressive. Congrats! With good conditions, I bet you pick up a tenth or two with those lighter wheels. Can’t wait to see what this runs with the exhaust.
I have a close friend who was pretty much taking the same stance as Kimovitzh just a week or so ago. His argument was spot on to all the points you make Kimz. He was a former Mustang owner who had experience using a canned tune. And the argument was friendly but it got me thinking so much so that I ending up doing a ton of digging into this and other audi forums as well as calling JHM to have a conversation about similar concerns of a canned vs. custom tune and they resonated pretty much everything justin is saying and more. And to me it makes sense as well. Everything from just trimming to inaccuracies of different dynos. They also mentioned blowing up several of these engines in testing which to me and like you said speaks volumes about R&D effort. He also went into a bit of detail about cylinder deactivation and other things in place to protect the engine on top of performance benefits. In the end they could certainly be saying these things to sell themselves, which is what said friend replied with when I told him about the convo, but I believe through all of the others on this and other forums that the results speak for themselves. So definitely to each his own and whatever makes a person feel comfortable but think about it - do you really just want a dyno sheet claiming 50hp that actually could end up being detrimental to the engine with no real gains or an all around improved driving experience with both performance and reliability added? Sorry for being so long winded but this one hit close to home due to having invested so much thought and my own research into the subject the past week or two. I’m certainly no expert on tuning but that’s just my two cents for what it’s worth.
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considering what I do is custom tuning on Subarus for a living, i can say that there are plenty of tuners that custom tune these cars (subarus) that could not hold a candle to a flash from the top 2-3 tuners. A dyno tune or custom street tune does not automatically make it better than xyz. This platform is thirsty for progress, i get that, but i went through this with the B6 platform years ago with these guys as well. Some can not figure out how to remove the torque restrictions set by ecu/tcu. will you gain something in terms of power? sure…anyone can get aggressive with timing and pick up some power, but unless you can remove the factory limiters, you most likely wont get to the level of the JHM files.
another platform i can touch upon that is a great example of the factory limiters placed by the ecu/tcu. i had a mk5 r32 that i would spray with nitrous. i had it on our dyno one day and played with the pills. Stock the car made 198whp, with a 50 shot and no other changes to tuning, bone stock ecu and tcu file, it made 250whp. with a 75 shot…250whp. with a 100 shot…250whp, 125 shot…250whp. whatever i through at it, the car would only make so much. i left it there and unfortunately the car was stolen before i could ever tune it but im using that as an example.
not knowing your tuners abilities, i can not comment on that. i can suggest to try for yourself and report back on results.
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Take what I’m saying with a grain of salt as I’m not impartial. Here is some perspective.
JHM had several cars. Both in house and customer cars that were S6 and S8 5.2 V10s. I guess you can say they custom tuned the cars. They custom tuned their test car and found the formula that worked and make GOOD power and unquestionable acceleration improvements. They then put that on the other cars. Logged and validated the results were consistent. From there they tested and improved on the dyno and street over the next several weeks to months. Testing in all kinds of conditions.
A JHM tune is more than just a WOT tune. How often do you drive WOT? Honestly? 90% of the time your part throttle or mid throttle.
JHM tuned not just for WOT throttle getting world record breaking results but, they looked deeper into the tune, into the part throttle, low throttle, off throttle. They tested on the dyno, then the street then the track and then in the city, stop and go traffic long road trips and they did this over MONTHS not minutes. Gathering data each step of the way improving each step of the way.
Do you drive to work on the dyno? I don’t, if you do, and you only drive WOT to work on a dyno… I don’t know how you actually would get to work that way but, if you tune your car that way your leaving 90% of the usable power untapped. Going to just get a dyno tune you’ll probably not make any power than the JHM tune currently makes. It’s not like JHM didn’t test already on a dyno for the best repeatable results.
IMHO A proven tune (canned or not) is better than an untested, unproven tune. The JHM tune has been producing the same results acceleration wise all over the world. It’s consistent and proven. You can always say. Oh there might be a few extra hp left. Maybe you can eek out something here or there. But at what cost?
This is the best quote so true —
I’ve been on the dyno and I’ve known TONS of domestic tuners who make a load of cash doing “custom tunes” all that means is in most cases they load up a tune that they know works for that combination and they dyno the car. Because if you’re a real tuner. You know X or Y combination needs this AFR, This ignition, this cam angle etc etc.
What’s so custom that needs to be tweaked? We all have the same MAF, Same cylinder heads, same throttle body, same motor, same camshafts, same injectors, same intake manifold the list goes on.
If you put in new injectors, build a custom intake manifold and then do major cylinder head work. Sure maybe a custom tune wouldn’t be a bad idea to look at. But for a 90% stock car IMHO a custom tune is a waste of your money and time. Especially when you have a tune like the JHM tune that has been performing so well for so long. There is no guess work. You already know what your getting.
For me, I’d rather have a tested tune that has been working strong and safe all over the world over the past several years with years of testing on the street and at the track. Vs someone who has little not no experience with the platform and is testing on my car on the dyno try try and make power.
But that’s just my take on it.
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Way to go guys!
I sadly don’t have my s6 anymore but I had most of the Jhm bits sans the exhaust and always felt strongly the car was a 12 second ride (impressive for the weight) that really pulled at any rpm. That said, it’s more about the complete package and the ecu and tcu really shined in all driving conditions not just peak numbers, this was even in the desert heat of Arizona.
This proves that anyone serious about these cars will follow the proven formula that JHM has laid out!
@CountVohn I wanna see some 11s this year. I’m confident with the full exhaust and decat that will be more than enough to put it over the edge. I’ll be watching from afar. Good luck everyone!
does anyone know of someone who makes long tube headers for the v10 s6’s? i have been looking for them but cant seem to find anywhere that can supply some.
CountVohn is the only one that makes them correctly, but be prepared to pay to play since their done the long/correct way rather than with a jig.
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You should see the sh*t storm the video of the white S6 is causing in the S6/S8 V10 group on Facebook. So many complaining saying the gains made are impossible when they could just speak with you and pay the price lol. You should see how crazy these guys got over the 100hp gain. Bunch of clowns 
. Some of them are on here lurking. I guess haters gon’ hate.
Facebook is where most of the dumbfucks go. I would be willing to bet most of the people who are whining don’t even have a V10 anything. It’s just a bunch of dumb asses that don’t care and they just want to bitch. Or they don’t want to believe you can spend the money and make real hp.
I’ll make quick work of this as we’ve actually all talked about this about 100x on this site with actual dyno info. I’ll try to find the dyno info to back up what I’m saying. I know you and most of the other smart people on here already know this but just for a refresher.
Take a standard S6 and S8. Pull the cats out and most people report a 50whp gain. We actually have a dyno on here from TWO separate people who with just the cats out dynoed a increase of OVER 50whp and posted it. Now keep in mind that is just removal of the cats. No tune… No headers… No cat back… No TCU tune. Etc et.
Lets look at Audis own words about how the S6 and S8 exhaust manifold was built for emissions and not performance. Here is the study guide from Audi on the S6 and S8
Blockquote
The ignition intervals and consequent exhaust valve
overlap can, in the worst case, create reverse pulsating
waves in the exhaust manifold. These reverse waves
inhibit both the scavenging of exhaust gas from the
combustion chamber after combustion and the intake
of fresh fuel mixture. This in turn reduces combustion
efficiency and increases emissions.
To overcome this phenomenon, a special exhaust
manifold design is required in which the exhaust ports
of each cylinder are mated to each other in a specific
manner. In the V10, a 2-1-2 manifold runner design is
used.
One solution to the exhaust gas pulsation phenomenon
would be to make an exhaust manifold runner for each
cylinder — a 5 into 1 header type system. However,
this system would be big and would create a thermal
disadvantage to the quick warming of the emission
required catalytic converters.
Blockquote
So in Audis own words there is more power to be had from a proper 5 into 1… But don’t take my word for it that a 5 into 1 makes more power. Lets take Audis
That is a lambo v10 5.2 exhaust manifold. GUESS WHAT… It’s a 5 into 1 and how much does a R8 or lambo make whp wise. 550whp… SO ummm yeah. Looks like headers would add a lot of power if you added headers then a tune. Then a catback…
Fackbook usually = dumb asses just looking to whine. Facts are not top of their list.
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