[WilyB]

After my recent high torque/low hp dyno on a Dynomite, I decided to have the car dynoed on a Dynojet.

http://www.e90post.com/forums/showthread.php?t=108775

Unfortunately, the two Dynojets operators listed in my area went bankrupt, one as recently as last week, so I selected the Dyno Dynamics from “function:tuned” a great tuning shop nearby Dulles Airport, operated by Dave.

Dulles elevation is listed as 313ft/94.5m, temperature inside the garage was 65F, humidity 20%, the hood was open and a mega fan was keeping everything cool.

My car operates smoothly, no error codes whatsoever and it pulls strongly all the way to the red line. All data logs during the V2 install show that the boost never went over 14.3.

I run Exxon 93 gas and my V2 map is at 94% across the board.
The first picture shows RWHP & TQ, the second shows the AFR and the third shows the boost.

On that dyno, a boost spike to 18 PSI happens around 3200/3500 rpm and, apparently, the ECU intervenes, probably on the timing, and thus lower the total output of the engine. The boost signal was taken at the blow-off valve.

Interestingly, on the road, the car pulls very strongly and in a very linear way. I am not a car specialist, but my “butt” dyno has been honed on numerous fast cars over the years and today I have a F-car, a twin turbo P-car and a finely tuned E36M3 in my garage. The power drop around 3000 is not felt while driving.

I wonder if Shiv and other e90posters have any explanations/suggestions.

Thanks.

PS: Dave reads forums, and I know Dave and Shiv talked last week about some Japanese cars. Dave is as curious as I am to find a solution.

[Sal@AUTOcouture]

maybe play with the 3000rpm values in the V2?

Try cruising at that rpm and see what happens too

[Sniz]

hmmmmmm.......what f car do you have?

don't know what to say about that graph. Isn't that along the same numbers as the other dyno's from that same manufacturer?

[fast_lap28]

you are not alone, I just dyno'd on Dyno Dynamics (stock) and my number was at 250 rwhp. there were two guys that I know with V2 with similar settings that ran right at 300 rwhp (one was even lower). we were all scratching our heads for the V2 guys

we disucussed that maybe the settings on the dyno were tweeked? who knows but its weird that someone else dyno'd on Dyno Dynamics and is looking at similar numbers.....

I kept on hearing from those with experience with Dyno Dynamics that these dynos are some of the more accurate out there (dynos differ one from the next of course). settings and conditions are not always the same and vary, etc....

All I can think of was the weather, it was 50 degrees F that afternoon

[scalbert]

Other than those spikes, which should not occur, nothing looks unusual for the torque plot and boost plots. Fuel looks fine as well. So there can only be timing and the dyno remaining to explain the low numbers and one we cannot see.

[cn555ic]

Damn lately thats all I see are these low numbers, Is V2 really pushing these numbers??

[badass335]

Pretty bad! I dynoed at Dyno Dynamics last year with V1.47 and got 321.9HP

[Ryan(e92)]

YOU NEED A BASELINE TO DETERMINE YOUR POWER GAIN!!! Go back and use the bypass plugs (this will give your baseline dyno). Then hook the v2 back up and dyno again. What you have posted is worthless information without a baseline dyno reading to compare it to.

[ArmyBimmerDude]

Dyno Dynamics read low, yes, but you really can't compare them because corrections could be made on one dyno that arent on others. You could change the settings on one to read more like a Dynojet.

[badass335]

I'm actually scheduled to go back in Feb to re-do to see the difference.

[cn555ic]

Originally Posted by Ryan(e92)

YOU NEED A BASELINE TO DETERMINE YOUR POWER GAIN!!! Go back and use the bypass plugs (this will give your baseline dyno). Then hook the v2 back up and dyno again. What you have posted is worthless information without a baseline dyno reading to compare it to.

Even with baseline, it still seems low as far as the numbers go...I just don't know how Shiv showed his dynos at 390 hp...390torque....I see people with downpipes and exhaust, intakes and make numbers like 340ish....I hope those numbers he shows is in direct corrrelation to his new map that coming out...So far there is alot of people doing Dynos on their car and have been disappointed with their numbers!!!

[jpsimon]

the 390/390 map was with a catless downpipe specific map... tuning for the downpipe is the key and really does produce lots more power

Originally Posted by cn555ic

Even with baseline, it still seems low as far as the numbers go...I just don't know how Shiv showed his dynos at 390 hp...390torque....I see people with downpipes and exhaust, intakes and make numbers like 340ish....I hope those numbers he shows is in direct corrrelation to his new map that coming out...So far there is alot of people doing Dynos on their car and have been disappointed with their numbers!!!

[Ryan(e92)]

You dont get it. What if his car baselined at 220whp on that particular dyno on that particular day? Well fuck me he gained 80hp and its the dyno reading low and needing to be recalibrated.

[Ryan(e92)]

This is why a baseline is important.

[WilyB]

Originally Posted by Ryan(e92)

What you have posted is worthless information without a baseline dyno reading to compare it to.

Ryan,

I know my car makes decent power. I am curious about the spike in the boost which does not appear in road tests. It is pretty obvious that after that spike, the ECU changed the timing and that caused the drop in power.

That same dyno produced reasonnable accurate numbers this past summer for the E36M3, given the modifications.

I am planning to return to function:tuned with the by-pass plugs now that I have them (Thanks Dustin!) and my laptop to try various % settings.

[Ryan(e92)]

What I am saying is that everyone knows what a stock 335 will dyno at. If it dynos between 265-280whp then yea your number is low. If it dynos at 220 hp then there is nothing wrong with your car and that particular dyno needs to be recalibrated. Boost spikes are very common and from the looks of it your car did exactly what it was supposed to do in that situation to prevent further stress on your engine/internals. My extremely limited experience with dyno dynamics dynos (dynoed only one car) are that they read low.

[Vyruz Reaper]

the more and more i am seeing all these Procede with lower dyno's..... few things come to mind.

Dynos are not real life results. Go to a drag strip and see what times you come up with. This will put to rest all the dyno improperly configured arguments shiv always brings up.

2nd, maybe im starting to think that there are faulty procedes going around. Maybe shiv is willing to exchange your procede with a brand new one.

lastly, maybe you installed it wrong haha

[ontopofm]

damn, your boost went up to 18 psi at the dyno...mine was at 16.25 and 15.40 last saturday. shiv sugguested i lower the % in that range. i got only 314 whp

[ArmyBimmerDude]

Originally Posted by Vyruz Reaper

lastly, maybe you installed it wrong haha

lol, honestly if these dyno's were done on dynojets like most of the other ones that have been seen here, there probably wouldnt be much of a discussion.

But yes, you're absolutely right. Dynos are supposed to be used to measure performance gains of mods. If you want to know what you really have, go to a track. I wonder if any in Atlanta are open in February.

[OpenFlash]

Originally Posted by Ryan(e92)

YOU NEED A BASELINE TO DETERMINE YOUR POWER GAIN!!! Go back and use the bypass plugs (this will give your baseline dyno). Then hook the v2 back up and dyno again. What you have posted is worthless information without a baseline dyno reading to compare it to.

+1

FWIW, Dyno Dynamic dyno do read much lower than Dynojets. We have one and have to multiply DD numbers by 1.13 to 1.15 to equal Dynojet numbers. In this case, that would be 340-345whp.

It also looks like your car is pulling off the rear rollers at peak torque. You can see this by a sudden bump in torque/boost at ~3500rpm. When this happens, the wheels are only spinning the front rollers and rear rollers are free-wheeling an no longer absorbing power. Then as torque falls, the car rolls back onto the rear roller and "catches". This causes a quick reduction in torque which you see above 5000rpm. DD dynos are awesome dynos. But you really need to strap the crap out of a torque RWD car in order to keep the tires centered on the rollers for a stable and consistent reading. Usually this requires using more than the standard traction bar.

Shiv

[Vyruz Reaper]

Originally Posted by shiv@vishnu

+1

FWIW, Dyno Dynamic dyno do read much lower than Dynojets. We have one and have to multiply DD numbers by 1.13 to 1.15 to equal Dynojet numbers. In this case, that would be 340-345whp.

Shiv

how convenient for you

[OpenFlash]

Originally Posted by Vyruz Reaper

how convenient for you

I agree. The truth is very convenient.

Read:
http://www.ls1tech.com/forums/showthread.php?t=711470


-shiv