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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > pissed n confussed at the dyno



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      06-14-2012, 10:01 PM   #1
Goldenchild
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pissed n confussed at the dyno

so i went and got the car dyno today on a mustang dyno. i did logs while he was doing a couple runs. but he was having trouble with running it in 3rd gear cus its auto and it would automatically downshift to 2nd gear, so he had to run it at a higher rpm in 3rd and and above 40mph. well after all said and done i was not impressed with the numbers. he blamed it on the dyno cus of my car being auto or the dyno reads alot less..but either way the readings are 279hp, 314tq. Which i don't think is right? car feels and seems alot faster then that. especially with what i raced. can i get your input on this..it has me frustrated and confused
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      06-14-2012, 10:41 PM   #2
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I think too low Eventhough with Xi and mustang dyno
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      06-14-2012, 11:05 PM   #3
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Tell the dyno operator not to mash the gas pedal all the way to the floor, there's a kickdown switch there.
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      06-14-2012, 11:15 PM   #4
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Quote:
Originally Posted by onebadmofo View Post
Tell the dyno operator not to mash the gas pedal all the way to the floor, there's a kickdown switch there.
+1, although those numbers seem about rigbt for your mods/mustang dyno.
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      06-15-2012, 03:10 AM   #5
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i thought you were supposed to dyno in 4th?
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      06-15-2012, 06:05 AM   #6
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Quote:
Originally Posted by Goldenchild View Post
so i went and got the car dyno today on a mustang dyno. i did logs while he was doing a couple runs. but he was having trouble with running it in 3rd gear cus its auto and it would automatically downshift to 2nd gear, so he had to run it at a higher rpm in 3rd and and above 40mph. well after all said and done i was not impressed with the numbers. he blamed it on the dyno cus of my car being auto or the dyno reads alot less..but either way the readings are 279hp, 314tq. Which i don't think is right? car feels and seems alot faster then that. especially with what i raced. can i get your input on this..it has me frustrated and confused
The logs tell the story. The tune is asking for 16psi and your car is producing 10psi. Massive boost leak or wastegate issue would be my guess...

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      06-15-2012, 09:44 AM   #7
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My numbers were 280 whp and 380 torque... I need to log a few runs.
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      06-15-2012, 12:19 PM   #8
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Lets see the ignition.
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      06-15-2012, 01:01 PM   #9
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
The logs tell the story. The tune is asking for 16psi and your car is producing 10psi. Massive boost leak or wastegate issue would be my guess...

Mike
So how do I go about testing the Wastegate or boost leak. I went through everything and I'm so frustrated ...errrr!!!
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      06-15-2012, 01:07 PM   #10
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What's weird is that when I'm on the streets. My boost hits 14 but never hit 17 yet. It was hot yesterday about 87 degrees. Just wonder how I would be having a leak already. Maybe I should put the stock cp on n see if it's the new cp I got leaking???
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      06-15-2012, 01:12 PM   #11
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Quote:
Originally Posted by Goldenchild
What's weird is that when I'm on the streets. My boost hits 14 but never hit 17 yet. It was hot yesterday about 87 degrees. Just wonder how I would be having a leak already. Maybe I should put the stock cp on n see if it's the new cp I got leaking???
Are uou sure you see the boost hitting 14+ on the streets? Map 2 jb4? Sorry on a iPhone. You shouldn't be hitting 17 psi.
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      06-15-2012, 01:17 PM   #12
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Quote:
Originally Posted by eyim1988 View Post
Are uou sure you see the boost hitting 14+ on the streets? Map 2 jb4? Sorry on a iPhone. You shouldn't be hitting 17 psi.
On the st. Map 2 jb4 and I hit 10-14. But I tried map 7 and it's only 14. Both maps never go above 14 even with 100 octane.
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      06-15-2012, 01:19 PM   #13
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Was it with full 100 octane ? Map 7 should be hitting 16+.
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      06-15-2012, 01:23 PM   #14
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20% 93 but I've been running it awhile to get the 100 in the motor
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      06-15-2012, 01:25 PM   #15
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Any ideas on what to do to fix or figure out my problem. Sucks spending this money and it's not running full potential ???
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      06-15-2012, 01:31 PM   #16
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Quote:
Originally Posted by Goldenchild
Any ideas on what to do to fix or figure out my problem. Sucks spending this money and it's not running full potential ???
It's most likely a boost leak. Do you hear any excessive air sounds when spooling ? Put it in a high gear up a steep hill and floor it and you might hear air leaking sound?? Lol
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      06-15-2012, 01:44 PM   #17
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also you were suppose to dyno on 4th and i have a feeling the guy who was dynoing your car hit the kickdown button like someone above me said..
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      06-15-2012, 01:55 PM   #18
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Agreed with everything said above.. 4th gear pulls without hitting that damn kickdown button. And definitely a boost leak judging by the logs.
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      06-15-2012, 02:31 PM   #19
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Guess imma have my buddy at BMW do a smoke test for me n see where it's coming from. But meanwhile I might throw on the factory cp n see if that's the problem. Cus when I put the new one on I forgot to put the big o ring gasket to the throttle body on. And I was only boosting 8-9. But after I fixed that it now boost 10-14. On map 2. But I still feel like the new cp isn't fully fitted even tho I adjusted and readjusted. Is there another o ring gasket to the inter cooler pipping?
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