85mm vs 100mm Downpipe

[Iceman12596]

Calling Kish for advice since he has one the best running N54s:chef:

Please let us know the outcome bud

 

[Kish2604]

Stick with the 3 inch dps for the N54, it's a tried and tested combo, you can't go any bigger in there unfortunately without some major redesign... The difference in volume between the 2.5 and 3 inch makes a lot of difference on the twin turbo motors

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[Yuben]

So 76mm it is. Scrap the 85mm and 100mm.
I would rather run that on my N54 coming from car that ran 11.93s and klapped the F80 M3 on the same dayraise:raise:raise:

 

[boost3d]

So 76mm it is. Scrap the 85mm and 100mm.
I would rather run that on my N54 coming from car that ran 11.93s and klapped the F80 M3 on the same dayraise:raise:raise:

76mm is for N54, O.P has the N55.

Have you seen the TMSS Downpipe for the N55.. it's raise:

 

[Yuben]

Thanks Rosh, was referring to Icemans N54.

So what would be the diameter to run for the N55 in Snip3rs case?

 

[Iceman12596]

Thanks Rosh, was referring to Icemans N54.

So what would be the diameter to run for the N55 in Snip3rs case?

Thanks obi wan ol master, 76 i shall go then raise:raise:raise:raise:

 

[Woodies]

n55 stock/OEM goes from 3.5" down to 2.5". Most guys I think are using 101mm (4"). TMSS has some amazing looking DP's. All their stuff looks tops.

 

[boost3d]

Thanks Rosh, was referring to Icemans N54.

So what would be the diameter to run for the N55 in Snip3rs case?

100mm!

Go big, or go home :cartel:

It all boils down to preference though. you could have a 200mm downpipe, but have restrictive oem piping after the downpipe which will negate all the benefit of having the larger downpipe to begin with.

on the n54, the only true 76mm downpipe is the AR design, you will notice that they have to taper down to 6xmm by the flange

 

[bilal04]

jus from my past experience. had a bigger 100mm dp on made less power than when i change to a smaller 76mm dp

 

[boost3d]

jus from my past experience. had a bigger 100mm dp on made less power than when i change to a smaller 76mm dp

Makes sense....its all about the back pressure

 

[amor35M]

So judging by all of this, basicly you say for the ewg the best one is 100 to 101.. what tmss and rogue are offering?

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[Snip3r]

So judging by all of this, basicly you say for the ewg the best one is 100 to 101.. what tmss and rogue are offering?

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Rogue 85mm and TMSS 100mm



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[amor35M]

So judging by all of this, basicly you say for the ewg the best one is 100 to 101.. what tmss and rogue are offering?

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Rogue 85mm and TMSS 100mm



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Why the diffrent sizes for the diffrent makes?

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[Melvino]

Anybody had their DP and Decat done by Abel from Viper ?

Had a chat with the man and he seems pretty clued up, still not sure what size i should be looking to go with and what the standard size is

Abel at viperperformance fabricated these down pipes on my n54

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Anybody had their DP and Decat done by Abel from Viper ?

Had a chat with the man and he seems pretty clued up, still not sure what size i should be looking to go with and what the standard size is

Abel at viperperformance fabricated these down pipes on my n54

The car was awesomely loud but it had an irritating buzzing tone at 1700rpm when you slow cruising in traffic
So i had to fit two 63mm resonator boxes in the middle. The performance has drastically Improved and with the DCT transmission you get a nice burble/fart sound between gear change "similar " to the gti's

 

[Snip3r]

So 76mm it is. Scrap the 85mm and 100mm.
I would rather run that on my N54 coming from car that ran 11.93s and klapped the F80 M3 on the same dayraise:raise:raise:

Yuben, did you fit the DP? Im booking in my car for Monday and i hope 100mm is the right choice for the N55 :YesNo:

 

[Yuben]

if Kamal is doing it I'm sure it will be the right spec.

I didn't do the Downpipes yet:YesNo:

 

[Snip3r]

Fitted a TMSS 101mm DP, the car sounds insane the cold start I'm sure my neighbors hate me now, I'm so happy right now, I need to dyno it


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[Eon]

Fitted a TMSS 101mm DP, the car sounds insane the cold start I'm sure my neighbors hate me now, I'm so happy right now, I need to dyno it


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Great stuff man! I have the same setup - N55 w/100mm DP, except that mine is a 135i. I put mine on the dyno last weekend and got 230kW and 456Nm so the DP definitely helped with the torque!

 

[Yuben]

Fitted a TMSS 101mm DP, the car sounds insane the cold start I'm sure my neighbors hate me now, I'm so happy right now, I need to dyno it


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:clapper: