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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 > N55 owners, we have a surprise for you.... :)



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      09-15-2010, 06:42 PM   #45
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Quote:
Originally Posted by klipseracer View Post
You don't want to do that. Upgrade the turbo to a (big) single and then that may become necessary. I had dual 3" catless midpipes and downpipes(the only set ever made) and I can tell ya that a single 4" exhaust would be excessive for the N55 which has virtually no heavy mods available.
At the moment we have a few things in the works...Vanguard Exhaust will be going on by the end of the month or so and hopefully soon it will be on the way to Helix for some R&D work for a new intercooler....


Then try to find out a way to spray some meth into it
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      09-15-2010, 06:54 PM   #46
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Quote:
Originally Posted by Matt@Camber-Toe View Post
At the moment we have a few things in the works...Vanguard Exhaust will be going on by the end of the month or so and hopefully soon it will be on the way to Helix for some R&D work for a new intercooler....


Then try to find out a way to spray some meth into it
Lets see who pushes for development the hardest :P
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      09-15-2010, 06:58 PM   #47
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I hope HPF works on something great like the M3 kit
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      09-15-2010, 08:32 PM   #48
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Quote:
Originally Posted by maxnix View Post
How do you get an inspection sticker?
I guess his state doesn't require the sniff test and uses OBD in which O2 modifiers can be used as long as the OBD readiness codes are ready!
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      09-15-2010, 09:08 PM   #49
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Quote:
Originally Posted by maxnix View Post
How do you get an inspection sticker?
Quote:
Originally Posted by cn555ic View Post
I guess his state doesn't require the sniff test and uses OBD in which O2 modifiers can be used as long as the OBD readiness codes are ready!
It goes per county. Some county's enforce it, others dont. The place I go turns your car on, puts the hazards on, walks around. Takes it around the block, bam. Instant sticker :woot:
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      09-15-2010, 09:14 PM   #50
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No one's worried about significant turbo lag with such a big pipe and deletion of BMW's "Twin Charge" pipes?
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      09-15-2010, 10:02 PM   #51
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Quote:
Originally Posted by aus View Post
No one's worried about significant turbo lag with such a big pipe and deletion of BMW's "Twin Charge" pipes?
what do you mean by twin charge pipes? This pipe is identical to the stock downpipe...go search the N55 teardown thread. I put pictures up of what the stock downpipe looks like.

If anything these will decrease spool time...which in this car should be a godsend. In a stock car I never feel the turbo kick in...too smooth for my liking.
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      09-15-2010, 10:11 PM   #52
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Quote:
Originally Posted by Matt@Camber-Toe View Post
what do you mean by twin charge pipes? This pipe is identical to the stock downpipe...go search the N55 teardown thread. I put pictures up of what the stock downpipe looks like.

If anything these will decrease spool time...which in this car should be a godsend. In a stock car I never feel the turbo kick in...too smooth for my liking.
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      09-15-2010, 10:40 PM   #53
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This is very nice and I cant wait for this to come out because I will most likely be purchasing one. However IMO a 4" DP on this turbo may be to big. Bigger is not always better. Yes the object is to have less backpressure and get the exhaust out as fast as possible. A 3" pipe would be plenty sufficient for the stock turbo(even for an upgraded one) to do this. I have a feeling that the 4" DP will actually sacrifice spool time and not help it spool quicker.


For example. Im heavy into modding late model mustangs. Ive built a few single turbo 4.6s that make in excess of 800rwhp. The setup consists of usually a single 76mm or 78mm turbo and a 3" downpipe. When we switched to a 4" DP, it took the turbo about 300-500rpm longer to spool. We did pick up power, but spool time did sacrifice. Now doing this on a much smaller turbo, I dont know how it will react. I hope Im wrong, but its just something to think about or maybe even test if you have the time to do such a comparison.

Dave
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      09-16-2010, 12:08 AM   #54
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Quote:
Originally Posted by Juiced46 View Post
This is very nice and I cant wait for this to come out because I will most likely be purchasing one. However IMO a 4" DP on this turbo may be to big. Bigger is not always better. Yes the object is to have less backpressure and get the exhaust out as fast as possible. A 3" pipe would be plenty sufficient for the stock turbo(even for an upgraded one) to do this. I have a feeling that the 4" DP will actually sacrifice spool time and not help it spool quicker.


For example. Im heavy into modding late model mustangs. Ive built a few single turbo 4.6s that make in excess of 800rwhp. The setup consists of usually a single 76mm or 78mm turbo and a 3" downpipe. When we switched to a 4" DP, it took the turbo about 300-500rpm longer to spool. We did pick up power, but spool time did sacrifice. Now doing this on a much smaller turbo, I dont know how it will react. I hope Im wrong, but its just something to think about or maybe even test if you have the time to do such a comparison.

Dave

If you read up a few posts, you will realize that twin 3" downpipes actually have more area on an N54 than one 4" pipe for an N55. So these are actually smaller overall than before...and the entire engine is breathing through one exhaust pipe now instead of 2 before.
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      09-16-2010, 12:10 AM   #55
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Lets see, first on the market...made by AR...

OK - $999 (intro price)!
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      09-16-2010, 12:47 AM   #56
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evaluate sound + performance gain first then $$$!
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      09-16-2010, 08:48 AM   #57
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Quote:
Originally Posted by Matt@Camber-Toe View Post
what do you mean by twin charge pipes? This pipe is identical to the stock downpipe...go search the N55 teardown thread. I put pictures up of what the stock downpipe looks like.

If anything these will decrease spool time...which in this car should be a godsend. In a stock car I never feel the turbo kick in...too smooth for my liking.
Get the jb3 stage 1 and that problem will be looonggg gone
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      09-16-2010, 09:09 AM   #58
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3.5" HFC DP ---> 3.5" true-single DP-back exhaust = W.I.N. for the N55.
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      09-16-2010, 09:57 AM   #59
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Turbo Upgrade Next...
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      09-16-2010, 10:13 AM   #60
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Quote:
Originally Posted by Matt@Camber-Toe View Post
If you read up a few posts, you will realize that twin 3" downpipes actually have more area on an N54 than one 4" pipe for an N55.
This is not a correct comparison. The combined airflow of the 2 turbos in the N54 is higher than the flow of the single turbo from the N55, as demonstrated by the fact that the N55 turbo cannot hold much extra boost to redline as opposed to the twin turbos in the N54 which can hold plenty of boost to redline (see the Vishnu wastegate duty cycle remarks).
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      09-16-2010, 10:48 AM   #61
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Ill have some cell phone pics up in a few minutes, then I will be boxing this bad boy up and sending it to Matt.

We are working on sourcing a high flow catalytic converter right now

Also, once Matt verifies fitment, downpipes will be available for purchase. And the price will be significantly less than $999, even though fabricating these is as labor intensive as a set of N54 downpipes...
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      09-16-2010, 11:10 AM   #62
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Sorry for the cell phone pics!
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      09-16-2010, 11:12 AM   #63
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Sold!!! Hopefully it won't throw any codes.

Last edited by Iceberg4; 09-16-2010 at 11:18 AM.
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      09-16-2010, 11:36 AM   #64
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Quote:
Originally Posted by Juiced46 View Post
This is very nice and I cant wait for this to come out because I will most likely be purchasing one. However IMO a 4" DP on this turbo may be to big. Bigger is not always better. Yes the object is to have less backpressure and get the exhaust out as fast as possible. A 3" pipe would be plenty sufficient for the stock turbo(even for an upgraded one) to do this. I have a feeling that the 4" DP will actually sacrifice spool time and not help it spool quicker.


For example. Im heavy into modding late model mustangs. Ive built a few single turbo 4.6s that make in excess of 800rwhp. The setup consists of usually a single 76mm or 78mm turbo and a 3" downpipe. When we switched to a 4" DP, it took the turbo about 300-500rpm longer to spool. We did pick up power, but spool time did sacrifice. Now doing this on a much smaller turbo, I dont know how it will react. I hope Im wrong, but its just something to think about or maybe even test if you have the time to do such a comparison.

Dave
There's a simple explanation for your experience on turbo Fords.

76/78mm is right at 3". Putting on a 4" exhaust will add an expansion loss as the exhaust flow slows down as it transitions from 3" to 4". That loss is much bigger than the extra flow area of the 4" for spooling.

This downpipe looks like it will also expand a bit after the turbo flange. A 3" might be better for spool, but like you said, you picked up power on your Fords with the 4".

Now someone get this thing on a N55 and start tuning. I want to see how the turbo does at high RPM where Shiv was reporting difficulty holding boost (no more than 12-13 psig I think).

On my old STI a better DP was key to letting the turbo spool higher and produce higher boost at high rpm. I'm guessing the N55 will be the same...
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      09-16-2010, 11:44 AM   #65
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Looks great Andrew, good to see progress for the new platform.

Quote:
Originally Posted by MteK View Post
Lets see, first on the market...made by AR...

OK - $999 (intro price)!
Obligatory genius speculating on price and dumping excessively high numbers.
Seems like every product introduction thread has to have one these days.

-Walter
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      09-16-2010, 11:46 AM   #66
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Sorry for the cell phone pics!
will this require removing periodically to clean with steel wool?
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