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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 > Complete N55 tuning



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      09-13-2010, 07:19 AM   #23
yitbos1
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Originally Posted by cstavaru View Post
There is such a big dip in torque on the stock N55 until 4500RPM that I find it hard to believe it feels better than the N54.
Not according to this.
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      09-13-2010, 11:02 AM   #24
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Nice numbers
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      09-13-2010, 11:17 AM   #25
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Quote:
Originally Posted by cstavaru View Post
There is such a big dip in torque on the stock N55 until 4500RPM that I find it hard to believe it feels better than the N54.
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      09-13-2010, 11:35 AM   #26
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Quote:
Originally Posted by cstavaru View Post
There is such a big dip in torque on the stock N55 until 4500RPM that I find it hard to believe it feels better than the N54.
That's just caused by an integral correction wind-up issue from loading up the car at such a low rpm, high gear. Really only seen on a high mass inertia dyno set up. It causes a ~1psi overboost which causes a throttle closure. You rarely see this condition on the road. But yes, we eliminate this issue with the Procede.
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      09-13-2010, 04:55 PM   #27
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Quote:
Originally Posted by yitbos1 View Post
Not according to this.
Well, in that dyno comparison the N55 torque looks straight but has 11-15hp less than the N54...
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      09-13-2010, 06:08 PM   #28
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Well, in that dyno comparison the N55 torque looks straight but has 11-15hp less than the N54...
Are you sure about that?
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      09-13-2010, 06:18 PM   #29
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Very nice work Shiv! Congrats! Do you think the same procede hardware will port over to the n63 eventually? I can see picking up a used 550 in a couple of years.
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      09-13-2010, 06:19 PM   #30
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Quote:
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Are you sure about that?
Why don't you just look at the graphs ?
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      09-13-2010, 08:08 PM   #31
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Quote:
Originally Posted by shiv@vishnu View Post
That's just caused by an integral correction wind-up issue from loading up the car at such a low rpm, high gear. Really only seen on a high mass inertia dyno set up. It causes a ~1psi overboost which causes a throttle closure. You rarely see this condition on the road. But yes, we eliminate this issue with the Procede.
Integral wind-up is a bitch

Good thing you fixed it or N55 pikes peak runs might have been affected!

I actually know exactly what you're talking about but it's amusing to me to see such a deep technical detail
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      09-13-2010, 09:28 PM   #32
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so much torque <3
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      09-14-2010, 01:41 AM   #33
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good info. keep up the good work.
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      09-14-2010, 05:25 AM   #34
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hey Shiv, what would you say a stock 4 door will put down???
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      09-14-2010, 05:10 PM   #35
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also who is making a high flow cat???!!!!!!!!!?????????
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      09-14-2010, 05:12 PM   #36
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also who is making a high flow cat???!!!!!!!!!?????????
camber toe is working on one i believe and so is ar. Your xi has cats/res on the mid pipes with the 335i has none, only one on the downpipe.
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      09-14-2010, 05:39 PM   #37
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stick on a 200 cell HJS cat!
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      09-14-2010, 06:16 PM   #38
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camber toe is working on one i believe and so is ar. Your xi has cats/res on the mid pipes with the 335i has none, only one on the downpipe.

ahh say whaaa???? no good!!! time to start cuttin ish apart!!! lmao
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      09-14-2010, 09:07 PM   #39
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Hey Shiv,

How does the top end on a vehicle with this tune feel? Let's say 100-150 MPH acceleration? From my experience, the N55 runs out of steam around 125, the pull after that is rather interminable on the stock tune.

Thanks
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      09-14-2010, 10:00 PM   #40
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Same as a stock two door?
hahaha good catch!!!

freekin awd lol duhhhhh
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      09-14-2010, 11:19 PM   #41
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ahh say whaaa???? no good!!! time to start cuttin ish apart!!! lmao
lol yeah Don't know why the xi has cats/res and the regular 335i's dont...

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Originally Posted by adrianBMW99 View Post
Hey Shiv,

How does the top end on a vehicle with this tune feel? Let's say 100-150 MPH acceleration? From my experience, the N55 runs out of steam around 125, the pull after that is rather interminable on the stock tune.

Thanks
Really? I've pegged my n55 and shifting from 4th to 5th feels great... the car just want's to keep pulling. I can only imagine how it feels with a tune...
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      09-15-2010, 06:04 AM   #42
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lol yeah Don't know why the xi has cats/res and the regular 335i's dont...






Really? I've pegged my n55 and shifting from 4th to 5th feels great... the car just want's to keep pulling. I can only imagine how it feels with a tune...



what a damn drag...i didnt want to put a whole new exhaust on, just put a new hfc on, i guess i will be doing a cool setup now :0)
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      09-15-2010, 07:03 AM   #43
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Really? I've pegged my n55 and shifting from 4th to 5th feels great... the car just want's to keep pulling. I can only imagine how it feels with a tune...
Really? I certainly hope you have quite a bit of distance to spare for this to happen... Crossing 130, it takes the car a while to gain speed.

You sir, have clearly never driven a well tuned and bolted evo, supra, Z06, or M5 for that matter!
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      09-24-2010, 11:58 AM   #44
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Really? I certainly hope you have quite a bit of distance to spare for this to happen... Crossing 130, it takes the car a while to gain speed.

You sir, have clearly never driven a well tuned and bolted evo, supra, Z06, or M5 for that matter!
Well no wonder you feel like it ran out of steam. Look what you are comparing it to lol
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