My thoughts as well. You’d be at the biggest handicap on a dyno with a non intercooled kit. This deficit reduces tremendously when you run a non intercooled car in real world conditions. I’d like to see the stage 1 JHM car that dyno’d 390 run at the drag strip. To me that’d put deeper perspective to all of this.
I was just reviewing this thread and saw something interesting. Here’s Denis’ (yellow RS4 in California) dyno results when he was stock tune, and full EBwerks catted exhaust. The numbers are low because the dyno is tough in all likelihood. Not an issue as we’re just looking at shape and delta.
notice his torque curves? The delta is pretty nice from 2000 to about 6000, and then it tapers considerably. Like it is being choked a bit as high RPMs enter the picture.
Below Denis’ dyno, I have included Mistro’s dyno which shows torque delta being virtually identical from 2500 RPM to 8000 RPM. He sees none of this taper. Mistro had JHM exhaust and tune.
You may say it’s the tune but I don’t know that I see that. In reality Denis’ car is stock tune and if he dyno’d in cool temps in 3rd gear, would see a huge torque restriction below 5500 RPMs (52% throttle limit imposed) and fairly normal shape above 5500. Instead, he see a big taper.
Just wondering if this could be attributed to his exhaust design or something else with his car. His shape is pretty flat from 6k up so maybe a carbon cleaning would have been in order. Mistro too needed a carbon cleaning.
Interesting observation. The hp looks like it has a different arch as well.
JHM ran Dennis’ car and the other stage 1 RS a couple weeks ago. Dennis’ did not break 12’s, but the other RS went high 11’s. I wasn’t told the trap speed.
So the exhaust either holding the car back or the car sounds like its got some issues going back quite a while. JHM has had how many different stage 1 RS4 cars into the 11s now? Something is definitely off on that car.
This is one of the reasons I’ve enjoyed JHM and their testing. When you have backed up your parts performance several different times you know there is a bigger issue.
Hope he can find out the issues and get them fixed.
Any more info?
So far I think there are 4?
Daytona car from detroit
Sprint car (dan’s) in california
Mugello car in california
Phantom car in california
They all went 11.x @ 118+ I believe. Only thing I may have wrong is the Mugello blue car. Others I have seen video of going 11.x
None of them are on the list (annoyingly) because Jhm haven’t given out the info I need yet (they’re holding back till a full release is ready). I need two timeslips for each car and full mod lists.
I think you meant Denis’ car didn’t break 11s. It went very low 12s. Something probably isn’t right with the car, but JHM will figure it out and no doubt in my mind it will be running 11s soon.
“Break out of” is how I think about it. You’re breaking a theoretical barrier. Break into is what the forums seem to think. I’m with the three doctors lol
I would love to see Denis run his car
- with piggies and stock exhaust and stock wheels
- With jhm full exhaust and stock wheels
Tall order of course. Not easy to get him to donate his car to science…then to tie up the shop with an experiment. Funny thing is Denis in happy with his car. We’re all wanting to see why he is down on the dyno or at the strip. We are the ones wanting to test this or that. He’s smiling ear to ear.
Haha…I see your point as well.
I am sure we will see Denis out there hammering on the car at the strip in the near future.
people just need to say break out of or break into and all will be clear. Rather than the ambiguous ‘break’
From the sounds of it, Denis trapped 115ish. The other car…a good chunk more. Same day, same track, same mods other than the slow car had ebwerks catted and the fast car had JHM catless. Both 2.75.
As we saw with my car and mistro’s car, a good exhaust with good cats can do very well. I went 12.51 @ 110.5 and Mistro went 12.21 @ 113.2,. both running the JHM catted exhaust.
For perspective, mickf29 had an ebwerks exhaust with no cats on his car…and went 12.40@111.0. He also had tune, lw rotors, lw flywheel, and about 250-300 lbs of weight reduction. Funnier still he ran 12.43@111.7 a week earlier…WITH STOCK EXHAUST! http://audirevolution.net/forum/index.php?topic=1195.msg27153#msg27153
So the ebwerks is adding 0 vs. stock exhaust in that test, as well as the other dyno results we saw for the production exhaust (meem and the other guy mentioned on page 1).
As we saw on my car, I picked up 2.5 tenths and 2 MPH with JHM catted exhaust. Loads of other people have done the same. Looks like that ebwerks is a dud from the data we’ve seen.
Denis (lol) is scheduled to run his car next month at Raceworz Drag and Show. His car has been to JHM on a number of occasions since that dyno video. Apparently there were tuning concerns. Also, he’s removed the cat and is running straight pipes again. The cat used on ebwerks are custom made, 200 cell, metallic - not sure about the flow of the cats. Denis felt there was an issue with one as on of his tail pipes had more soot than the other. I believe his car is back at JHM - his car was emitting white smoke at part throttle and idle.
Reportedly, his tune at the dyno was a “soft tune” and not as aggressive as the black RS - not sure why have different tunes. Denis car has been retuned at least 2 other times after the dyno. The tune and possible mechanical issues could have contributed to the low dyno number and now current 1/4 results.
Hope it gets all sorted out and Denis is able to run his car next month. And, yes, despite issues, he is quite happy with his car. He has other toys and would more likely allow JHM to test multiple configurations on his car. If you add up all the time his car has been there, it’d be months. Ah, the joys and perils of being an early adopter.
We probably don’t hear much about the black RS as the owner is over seas and only sees his car briefly when he’s visiting. Issues with that car may arise when he is back and is able to drive his car for extended amount of time.
isn’t it Denis? I thought he was Brazilian.
???
What issues?
You seem to be basing your assessment of the JHM supercharger on Denis’ yellow car that appears to not be setup all that great or had a problem with the car. Maybe you missed the dyno above where it put down 265 WHP and 230 WTQ when it was stock.
Don’t forget that the kit is on a few other customer cars in California, not to mention Dan’s car, and the Daytona Grey car which has had it for over a year now.
Denis’ car had cats for the last 1/4 run. I have a feeling these cats don’t flow well.
Yes, I lol cause I spelled it wrong his name wrong in my previous post
No issues that I’m aware of with the black RS. I stated “may arise” as it’s not been driven extensively. There may be something the comes up or nothing comes up. Dan and the Daytona have had the opportunity resolve anything that may have presented itself. As Denis drives his car, new and/or preexisting issues are coming to light.
Curious, who has the Daytona Gray car? Is that in Cali?
Nvm saw you said Cali. I wasn’t aware of that one.
It’s the car that went 11.12 @ 125. It’s from Michigan but is in California for stage 3 right now.
My car has also had a few tunes, and in my opinion this speaks volumes for JHM’s dedication to their customers. The current tune most likely isn’t as aggressive as the black cars either, but I asked for that. The car drives perfect, pulls hard and has been dead nuts reliable. Again, I honestly can’t say enough good about Count Vohn.
Agreed looks like great customer service on the part of JHM and a lot of second hand information from tridoctor.