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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-30-2013, 05:26 PM   #261
Iceman00
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Quote:
Originally Posted by powbmps View Post
What kind of dyno was that on?
I've used that one before - page 1 on the dyno page
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Old 07-30-2013, 05:28 PM   #262
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But it doesn't take into account the built in safeties that heatsoak triggers is the point I believe Jared is trying to make
I agree - but that's on the car and dyno operator to measure and detect that.
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Old 07-30-2013, 05:29 PM   #263
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Originally Posted by powbmps View Post
What kind of dyno was that on?
It's a dynomite. Not my car obv but same dyno.
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Old 07-30-2013, 05:46 PM   #264
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Originally Posted by Iceman00 View Post
I agree - but that's on the car and dyno operator to measure and detect that.
I just read through that article in its entirety again thinking I must have missed something.

They never once dyno the car in a cold temp and then in a hot temp and compare the corrected numbers to see how well the correction factor works. All they do is compare the correction factors to each other and explain the principle of them. I get that the SAE and STD correction factors are attempting to even to the playing field, I just don't think that they do. I am also not talking about gross heat soak or a car thats pulling massive timing, that should be obvious on the dyno. However I'm talking about the extra timing and air that a motor can get away with in the cold. I'm talking about significantly lower temperature throughout the whole system that will bring power up when its cold. More than any SAE correction factor ever does when dynoing on a hot day. I think this is something we will have to settle with a dyno in the fall.
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Old 07-30-2013, 06:36 PM   #265
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It does!
"
29.53-inHg and 33-percent humidity, we recorded 399.03-rwhp and 383.99 lb-ft of torque, numbers almost perfectly inline with our initial testing. These uncorrected numbers represent exactly what the Camaro could put to the wheels on this day, during this test..."


the SAE correction factor standardizes temperature to 77-degrees F, 29.23inHg and dry, 0-percent humid air...
SAE, unlike uncorrected or STD, also uses a mechanical efficiency (friction) modifier in the correction factor

Read more: http://www.gmhightechperformance.com...#ixzz2aZJTg6Fi

It directly compares the conditions of the run to the current correction factor- same car and mods on a warmer day actually made less power than the corrected numbers. Am I understanding you incorrectly?
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Old 07-30-2013, 06:41 PM   #266
jared_wiesner
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They dyno every time at a temperature somewhere in between 80-85 F. Then they compare uncorrected runs vs corrected runs.

What I have seen big power differences on is when the same car is say dyno'd at 50F and then again at 90F and both times SAE correction is used. When I get a change I'll scour the net for the dynos again, they were hard to find. Very few people have recorded dynoing a car hot and then cold with no changes. The results show big power gains for the 50F run vs the 90F run. This is even though the SAE correction is there and should be leveling the two out to a nice even 77F.
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Old 07-31-2013, 01:35 PM   #267
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Here is something to mull over.

I just checked and my uncorrected peak number from my last dyno is 208 WHP. If its only bumping my number up by 2 horsepower on an 89 degree day thats crazy. Even more crazy is that I realized that I have an example of my own demonstrating how the SAE standard just doesn't really work to even things out. This is a dyno comparison of my car done on a cold day and a dyno on a hot day. The hot day dyno should have the advantage since I had replaced badly fouled spark plugs, a very dirty fuel filter and put power pullies on the car since the cold day dyno.

Even more ammusing is seeing the correction factors associated with the dynos. The cold day's number is being multiplied by 1.03. The hot days number is only being multiplied by 1.01. I can only assume this is due to the pressure differences on the days which in my book has much less to do with power output compared to temperature.

Quote:
Originally Posted by jared_wiesner View Post
I dyno'd at 188 horsepower last october and my best pull today was 188 again. Since October I've done power pullies and replaced badly worn out spark plugs and a very clogged fuel filter. The car has felt better after each one of those improvements. I can only hope that after the tune my car will improve.


Conditions: 89.73 F, 29.40 inHg, Humidity 12%, SAE 1.01

The second picture is my pull from back in October when conditions were:
69.69 F, 28.7 inHg, Humidity 50%, SAE 1.03






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Old 07-31-2013, 03:21 PM   #268
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Huge difference in humidity as well... I'm just not convinced it the weather will make such a noticable impact. I know it's possible, but that tune just doesn't look right to me.
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Old 07-31-2013, 03:30 PM   #269
jared_wiesner
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Huge difference in humidity as well... I'm just not convinced it the weather will make such a noticable impact. I know it's possible, but that tune just doesn't look right to me.
That's fair, I guess we will see.

But in terms of humidity from what I've read, it has very little affect on power.
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Old 08-14-2013, 10:59 PM   #270
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I dunno about all this, but I know the butt dyno says there's a "butt"-load more power on a cool day, and especially at the start of my commute.

I'm thinking it's time for the long tube intake and some header wrap!
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Old 08-15-2013, 12:01 PM   #271
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If you're contemplating header wrap, just send the headers to Swain and have them coated instead. Either way you have to remove the headers and you'll be happier with the coating.
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Old 03-21-2014, 04:36 PM   #272
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I guess there's no more update on this?
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Old 03-25-2014, 09:38 PM   #273
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Hey Jared, just curious, what spark plugs are you running?
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Old 03-26-2014, 09:28 PM   #274
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I have yet to talk to anyone or hear from anyone that was truly happy with the Epic tune. I have talked to people that made dyno appointments for a remote tune only to be stood up or Epic was so late that they had to pay for more dyno time. And yet here I am optimistic that some day I will make more power with my Epic tune.
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Old 08-18-2014, 02:03 PM   #275
jared_wiesner
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I couldn't be happier with my Epic tune. The car feels fantastic now. I will need to get back to dyno again to verify, but I think my cat was a big problem. It's just a magnaflow cat and it was situated right behind the merge in my 3 inch exhaust. After doing a bunch of reading I concluded that a single cat could not possibly be flowing enough. (Unless its one of few high dollar 100 cell cats, which it is not). So, while putting my car back together from subframe reinforcement a couple weeks ago, I cut out the cat and made a bolt in test pipe. The car definitely has picked up some in the top end.

Here's a video I took on a closed/private road

7.8 60-100 mph (100-160km/h) with 2.93 gears.

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