[Dallas_335_Coupe]

For Dallas Dyno day, I took my 335 6MT with JB3 Map 5 to a local Dyno. They said their Dyno was typically around 10-20HP low, without any real explanation, and the other 8 E90 members agreed (one person running MAP 0 on JB3 maxed HP at 240). My car was full Texas Temp warm (ran AC) and the Dyno conditions were 87 degrees F.

Anyway, my car is stock other than the JB3. I am and have always run 93 octane (common stuff in Texas), but I cannot quite figure out my HP curves. It would appear I am building quite a bit of torque, but HP maxs out around 5000 RPM and torque falls off. Based on some other peoples curves (some with slightly less torque) running JB3 with little or no upgrades, their HP continues to increase till almost redline. What gives.......

As a side note, I ran the 2nd and 3rd pass with the airbox open and the filter out since everyone was experiencing heat soke after their first pass. I did not see any expected improvement.

[Sniz]

thats a really wavy dyno, doesnt look like your engine was happy w the conditions.

[Mike@N54Tuning.com]

On a hot day with insufficient airflow over the intercooler the JB3 will pull boost down and the ECU will pull timing down. If cars are doing 240rw stock that isn't too bad for a stock car on map 5.

Mike

[Sniz]

Originally Posted by Mike@N54Tuning.com

On a hot day with insufficient airflow over the intercooler the JB3 will pull boost down and the ECU will pull timing down. If cars are doing 240rw stock that isn't too bad for a stock car on map 5.

Mike

I dont think most people realize just how much DA and airflow on the dyno matter, makes a huge difference sometimes.

[Brey335i]

Most 335i's will have significant taper after 5000 rpm

[Clap135]

Knock knock...good luck with that.

[michael1284]

For what it's worth I dyno'd at the same place, same day. I'm not sure how hot it go later on in the day, but it was 87/88F when I did mine around noon-ish. The only thing that I didn't like at the dyno place was the fan they were using. It was a TINY little fan that they stuck in front of the FMIC, although it blew a lot of air, it was definitely not the best setup.

whatever it was that day, all the jb3's seemed to have really wavy dyno's. I attached 2 dyno's, first is another jb3 (mistertinnie), and the 2nd is mine - procede with autotune. THIS IS NOT TO START A TUNER war. I was just stating what I noticed that day, as I was the only procede car. I can't say I know enough about tuning to know what's good or not, but I just figured that smooth = better?

[OpenFlash]

Originally Posted by michael1284

For what it's worth I dyno'd at the same place, same day. I'm not sure how hot it go later on in the day, but it was 87/88F when I did mine around noon-ish. The only thing that I didn't like at the dyno place was the fan they were using. It was a TINY little fan that they stuck in front of the FMIC, although it blew a lot of air, it was definitely not the best setup.

whatever it was that day, all the jb3's seemed to have really wavy dyno's. I attached 2 dyno's, first is another jb3 (mistertinnie), and the 2nd is mine - procede with autotune. THIS IS NOT TO START A TUNER war. I was just stating what I noticed that day, as I was the only procede car. I can't say I know enough about tuning to know what's good or not, but I just figured that smooth = better?

Waviness and low power=knock

So yes, smoothness and good power is what you and your engine want. And what a proper tune gives you. You can't expect good results in bad conditions with a simple boost controller.

[BrianMN]

I always notice jb dynos are Much less smooth...many of them being as wavy as above.

[Sniz]

Originally Posted by BrianMN

I always notice jb dynos are Much less smooth...many of them being as wavy as above.

has been that way from the start. Some are good but normally requires race gas or meth to keep the engine happy. When its hot in the dyno room (fairly common issue) they always seem to be wavy.

[Mike@N54Tuning.com]

Originally Posted by michael1284

For what it's worth I dyno'd at the same place, same day. I'm not sure how hot it go later on in the day, but it was 87/88F when I did mine around noon-ish. The only thing that I didn't like at the dyno place was the fan they were using. It was a TINY little fan that they stuck in front of the FMIC, although it blew a lot of air, it was definitely not the best setup.

whatever it was that day, all the jb3's seemed to have really wavy dyno's. I attached 2 dyno's, first is another jb3 (mistertinnie), and the 2nd is mine - procede with autotune. THIS IS NOT TO START A TUNER war. I was just stating what I noticed that day, as I was the only procede car. I can't say I know enough about tuning to know what's good or not, but I just figured that smooth = better?

LOL Mistertinnie was running a meth map manually but his meth kit wasn't working!

Mike

[OpenFlash]

Was the OP also running a "meth" map?

[michael1284]

Originally Posted by Mike@N54Tuning.com

LOL Mistertinnie was running a meth map manually but his meth kit wasn't working!

Mike

i think his meth ran semi-OK the first run, then didn't work his second run. that last run was working fine. he had switched his solenoids or something. so the one that i posted is his meth working fine.

regardless there were like 9-10 people that dyno'd that day, and half were jb3. and they were all wavy...it's a fact that my dyno was much smoother than the jb3's. now the reasons why, i have no idea, as i don't know that much about tuning :/ again, i'm not trying to start any wars, it's just my observation so take it as it is.

[Mike@N54Tuning.com]

Originally Posted by michael1284

i think his meth ran semi-OK the first run, then didn't work his second run. that last run was working fine. he had switched his solenoids or something. so the one that i posted is his meth working fine.

regardless there were like 9-10 people that dyno'd that day, and half were jb3. and they were all wavy...it's a fact that my dyno was much smoother than the jb3's. now the reasons why, i have no idea, as i don't know that much about tuning :/ again, i'm not trying to start any wars, it's just my observation so take it as it is.

If you were not trying to start any wars you would not take dynos from someones "my meth isn't working thread" and posting them as comparisons. The meth was not working during any runs as he had IATs of 160 degrees in each of his logs. For the rest it all depends on the settings, mods, fuel used, etc. Having a big IC to absorb heat is also an advantage on a hot day on the dyno.

Mike

[michael1284]

Originally Posted by Mike@N54Tuning.com

If you were not trying to start any wars you would not take dynos from someones "my meth isn't working thread" and posting them as comparisons. The meth was not working during any runs as he had IATs of 160 degrees in each of his logs. For the rest it all depends on the settings, mods, fuel used, etc. Having a big IC to absorb heat is also an advantage on a hot day on the dyno.

Mike

First of all I know him in RL so I didn't need to take his dynos from any thread, here or on your forums. Second of all, none of this was to start a war, I was just stating my observations from that day. It wasn't just me saying it, even the jb3 guys were noting the differences in curves. I'm not saying any tune is better, as both put down the power. It is kind of scary that he was running map 9, pump 93 octane gas, with his meth not working and hitting like 17-18PSI.

No one's here to bash your product. I was just stating a fact. Regardless I'm done with this thread as none of this help's Russ.

My apologies Russ.

[Jeff@TopGearSolutions]

Dont worry man you cant post any topic without heads butting about tunes....
Smooth is good, and your power looks good as well as the power under the curve.

Worry about yourself and your friends car FTW

[Clap135]

People are in so much denail its not even funny. The guys posted that all jb3 dynos that day looked like shit, and yet Mike still defends it.

OP I would not run your car like that, if you have a BT tool log timing/throttle.

[Dallas_335_Coupe]

Anyway.......

The car puts down good power, and the Dyno conditions were far from ideal. I know all of us who dynoed that day could put down more power. Heat soke being the issue it was there, most tunes had trouble adapting.

I guess this brings me to the point of the Dyno results. How to complete the top end of the HP curve and sustain better torque? My first thought was better breathing. But on my secound and third run, I took the air cover off. I cannot imagine anything better than no air restriction.

Perhaps a better Intercooler would help? Don't get me wrong, I know if helps, but I am looking at best bang for the buck for what I have.

Then I thought about exhausts, but it would appear people running exhausts give up some torque for HP gains. The complexity of install and price make this one difficult to test/execute. Coming from the realm of 2 stroke racing carts, there is more to an exhaust than a fat pipe. I can imagine BMW spent quite a bit of time maximizing their Exhaust airflow to get the most torque and power. Opening it up gets those turbos spooling faster, but may affect the resonance of the chamber.

Finally, this last thought is based on the use of the JB3. It seemed my car took about 3-4 days to really "adapt" after install. Changing octane, squirting meth, or opening up the exhaust with something like a cut-out, how quick can the system adapt?

I wonder if I went to Map 0 and ran for a while, and then switched to Map 5 (that I typically run), would there be some delay in getting back to full power......

Russ

[Mike@N54Tuning.com]

Originally Posted by Clap135

People are in so much denail its not even funny. The guys posted that all jb3 dynos that day looked like shit, and yet Mike still defends it.

OP I would not run your car like that, if you have a BT tool log timing/throttle.

Because dynos are a tricky thing. If all JB3 dynos looked like that then that would be another story but there a lot of JB3 dynos that looks smooth as silk, and the top 10 dyno thread we had was dominated by smooth JB3 dynos, so I don't see your point. I know you have your agenda but you need to be a little objective.

Mike

[Mike@N54Tuning.com]

Here is a dyno of a 100% stock car, also taken in poor conditions. This is a friends car. I guess they have bad tuning and knock as well?

Mike

[BrianMN]

I think the problem many of us are having is why are nearly all the procede dynos we see smooth as silk, and even resemble the consistency of a NA engine? The isolated boost control system is what I suspect... Not sure of what to think of the stock dyno Mike just posted.

[OpenFlash]

Originally Posted by Mike@N54Tuning.com

Here is a dyno of a 100% stock car, also taken in poor conditions. This is a friends car. I guess they have bad tuning and knock as well?

Mike

Please Mike. If you can't see the difference between the OP's dyno result and the dyno result you just posted, you really shouldn't get involved in this thread. The one you posted was caused by the car oscillating back and forth on the rollers due to it not being strapped tightly. You can tell this is the case by the relatively low frequency sine wave patterns in the power curve. Now look at the OP's graph and see the difference.

Shiv