Low Dyno?

[smilesperhour]

I did 3 dyno pulls last weekend. My butt dyno was a lot higher. What do you guys think of these numbers??




2011 E88 135i N55

mods: Cobb stage 1 sport, bms intake, bmw pe cat back, 10%ethanol crap gas.

289hp/328ftlbs

[darkrom]

Bad numbers IMO for a tune, but at the same time I know nothing about the dyno. What you should have done was 1 run stock, then one run with the "stage 1" tune on it and you would have been able to compare. Dynos are so variable, a car could read 50WHP higher on one than another, on the same day.

If I get around to dynoing my car it'll be with the JB4 autotune running correctly for 1-2 runs, then the last run I'll turn it off and see how it does stock.

[vivanapoli806]

Yeah we have to know what dyno. On a dynojet I made 348hp/401tq running cobb stage 1 aggressive. I have n54 135

[mike@x-ph.com]

Originally Posted by smilesperhour

I did 3 dyno pulls last weekend. My butt dyno was a lot higher. What do you guys think of these numbers??




2011 E88 135i N55

mods: Cobb stage 1 sport, bms intake, bmw pe cat back, 10%ethanol crap gas.

289hp/328ftlbs

It does not matter what brand is the dyno (2 dyno jets can have 10% power result difference).
Most important thing is that you do one 1 run stock and one run with the map to compare the difference.
Eventhough you cannot remove the mods at least put the car in map 0.

[foghat]

Originally Posted by mike@x-ph.com

It does not matter what brand is the dyno (2 dyno jets can have 10% power result difference).
Most important thing is that you do one 1 run stock and one run with the map to compare the difference.
Eventhough you cannot remove the mods at least put the car in map 0.

Yes and no. It is well known that dynojets read significantly higher than mustang and dyno dynamics dynos. But yes, there can be a variance between two same brand dynos.

That number on a dynojet is most likely be pretty low. On mustang or DD, maybe not. But yes, ideally you had a before and after pull on the same day.

OP, was correction applied to the number? If not, what is your altitude? If there was no correction applied and you are at a high altitude using a DD or mustang, you could be right on.

On a DD with stage 1 aggressive and dci (94 octane) I dynoed 330/406 with correction (cobb map 0 was 277/309). I think the correction factor was about 12%, so without correction that would put me right about where you are - for hp anyways. I am at about 3500 feet.

See my sig for my numbers now. I can tell you the thing is a beast. Step on it in 3rd and rubber, no problem.

[mike@x-ph.com]

Originally Posted by foghat

Yes and no. It is well known that dynojets read significantly higher than mustang and dyno dynamics dynos. But yes, there can be a variance between two same brand dynos.

That number on a dynojet is most likely be pretty low. On mustang or DD, maybe not. But yes, ideally you had a before and after pull on the same day.

OP, was correction applied to the number? If not, what is your altitude? If there was no correction applied and you are at a high altitude using a DD or mustang, you could be right on.

On a DD with stage 1 aggressive and dci (94 octane) I dynoed 330/406 with correction (cobb map 0 was 277/309). I think the correction factor was about 12%, so without correction that would put me right about where you are - for hp anyways. I am at about 3500 feet.

See my sig for my numbers now. I can tell you the thing is a beast. Step on it in 3rd and rubber, no problem.

I agree 100%

[Allen@MOTIV]

Originally Posted by smilesperhour

I did 3 dyno pulls last weekend. My butt dyno was a lot higher. What do you guys think of these numbers??




2011 E88 135i N55

mods: Cobb stage 1 sport, bms intake, bmw pe cat back, 10%ethanol crap gas.

289hp/328ftlbs

If possible get a datalog. If the tune is getting along with the car then in all likelihood it's just a low reading dyno.