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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > 335xi mustang dyno v2



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      01-31-2008, 03:06 PM   #23
Bubbles
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Quote:
Originally Posted by shiv@vishnu View Post
That dip is always there at ~4500rpm. This dyno tends to exaggerate it a bit due to the way it scales the power and tq axis. Notice that it doesn't go from 0 to 400 as it would on a Dynojet. Also, the filtering is only set to 21 which means that it is picking up a lot of mechanical dyno noise as evident by the static at high rpm. Engines don't do that

Shiv
I see a slight dip on my dyno, but not close to the 2 drops exhibited by OP. Why is his torque low? Is it due to the "xi"?

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      01-31-2008, 03:25 PM   #24
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usually the torque on the XI stays about the same as non XI 335's... Usually its the HP that is lower (at least that's what other dyno's have shown)
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      01-31-2008, 03:31 PM   #25
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I would look into the DIP.

did you have a similar dip on the dyno with the leak?

It might be the infamouse CAI dip. =o
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      01-31-2008, 03:48 PM   #26
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Quote:
Originally Posted by Bubbles View Post
I see a slight dip on my dyno, but not close to the 2 drops exhibited by OP. Why is his torque low? Is it due to the "xi"?

Completely different dynos with different calibrations. I've used the one at Japtrix too and it was calibrated to read like a Dynojet. v1s were getting 320-335whp.

Shiv
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      01-31-2008, 03:57 PM   #27
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Hey shiv, do you think i should be producing more torque. Could it be because i didnt give the ecu time to adapt after the install of CAI annd IC along with messing around with the torque setting? Maybe even the fact it not a dynojet so it calculates its numbers differently. I found old v1 dynos and they have a big difference from torque to hp, some with even over 400 torque, Ive also found v2 dyno numbers where the torque was close to the hp number. Is this new map tuned to have closer hp to torque numbers, like less torque at lower rpms and higher hp at higher rpms?
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      01-31-2008, 04:36 PM   #28
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Quote:
Originally Posted by shiv@vishnu View Post
Completely different dynos with different calibrations. I've used the one at Japtrix too and it was calibrated to read like a Dynojet. v1s were getting 320-335whp.

Shiv
Regardless of calibration, a dip is a dip is a dip, indeed. We aren't arguing total figures (WHP or WTQ), we are talking quick drops in value, twice in the case of the OP. However, the OP's torque does seem low.
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      02-01-2008, 02:13 PM   #29
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I would assume the synojets would rea much higher like 370 whp, dont know how much is lost to awd.
Dynojets read around 10-12% higher than Mustangs. AWD hp loss is close to 30%. Mustang dynos are pretty conservative.

Great numbers btw!
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      02-01-2008, 03:01 PM   #30
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Originally Posted by serge View Post
Dynojets read around 10-12% higher than Mustangs. AWD hp loss is close to 30%. Mustang dynos are pretty conservative.

Great numbers btw!
30% is way too high of a loss figure for this system. Even on the fully mechanical AWD systems of subaru, loss was closer to 20%.
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      02-01-2008, 04:38 PM   #31
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Quote:
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Dynojets read around 10-12% higher than Mustangs. AWD hp loss is close to 30%. Mustang dynos are pretty conservative.

Great numbers btw!
That depends on how the mustang dyno is calibrated to read... You can make a mustang dyno produce almost exact same numbers as a dynojet...
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      02-01-2008, 05:53 PM   #32
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That depends on how the mustang dyno is calibrated to read... You can make a mustang dyno produce almost exact same numbers as a dynojet...
Not this dyno....this dyno is at performance motorsports, which is in the nissan dealership...its the dyno they use at the dealership and hjave it set to dyno factory cars. Def. no playing with numbers on this dyno.
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