MyE28.com

Log style vs tubular ( I think that is the correct term)

Heard a turbo mechanic tell me that he doesnt prefer the log type manifold for high boost applications...he said that they are prone to bottleneck...

Man is very humble but prefered the 6 in 1 approach saying that this give you the option of not having to upgrade the manifold if ya wanna turn the boost up lets say past 20psi...

I actually know someone that uses Patrick Philpots welder and is making a manifold now for his e28....and he uses the 6 in 1 design as well..and that was a monster putting out 600+(Big Red)

Wondering the truth behind that....

Also had a question on water to air intercooler setups....

How do you take the heat out of the water?

[QUOTE="rundatrack"]Also had a question on water to air intercooler setups....

How do you take the heat out of the water?[/QUOTE]

The water has a pump and is pumped through a small heat exchanger, just like your car does with a radiator. The heat exchanger usually sits up front and keeps the water near ambient tempertures.

if someone would like to host, i can post a picture of the heat exchangers on my car and give you and idea of how they work. also, i know a few cars running log manifolds for up to about 650 rwhp. after that, one car i specifically know upgraded to a boostlogic manifold and they builer liked it so much he had someone design a similar manifold and will market them next year i think. if you look at the swedes and alot of high hp cars around the world (supras, m3's) alot run tubular manifolds because they flow better. the guy who built and tested the boostlogic manifold redyno'd the car after just the addition of the manifold and a motor rebild and made another 30 rwhp (?). do a search on bimmerforums and you can find mroe about that particular subject.

Ultimately a tubular manifold "can" allow for higher power output but, at what cost. A properly designed log type manifold will support huge power also.
You see a lot of people using tubular manifolds not because they are superior in performance but because they are "one offs". You'd have a very expensive manifold if you had a pattern made, cast and machined a single unit for your homemade turbo system. Also, cast manifolds tend to have longer lifespans than tubular ones.
If you're building a job specific (race application) manifold then a tuned, equal length header type manifold is the way to go. For a monster of a daily driver with greater durability, go with a good cast manifold.
A good tubular manifold will have minimal performance above a good cast, log manifold but will cost a good bit more.


[Edit by Sweeney on [TIME]1127385179[/TIME]]

Equal length tubular manifolds flow better. That is a given. I recently read a review of a bone stock EVO that was modified with a turbular equal length manifold and it made 3.5% more power. You can draw your own conclusion if you think they are worth the additional expense.
Todd

for the power i am making and plan to make, the log manifold's price and durability work for me. also, anyone wanna host those pics for me?

www.imagecave.com

free hosting, provides you the links - no bs.

[QUOTE="gol10dr1[/I also, anyone wanna host those pics for me?[/QUOTE]
For those who need a temporary host server, and have some basic knowledge about transferring files using ftp, you can use the info below:

server IP: 193.231.235.1
user: mye28
password: bimmer
Load the image file in the home directory (no need for cd)
For example, if you upload a file call "mypicture.jpg", it will be accessible under the following URL:
http://193.231.235.1/mye28/mypicture.jpg

Conditions:
- Please regard this service as a short-term host solution, available ONLY for mye28.com community. Any file suspected that it is used for other purpose will be deleted immediately.
- The total available space is about 5 GB.
- Do not upload important files, that need to be available for months and years from now on. Use it only for hosting files that are relevant now + a couple o weeks from now on.
- This service may be ended at any time, without warning.

i like my ceramic coated log style manifold a lot =]