MyE28.com

This is an entirely new pattern. Not yet machined but almost ready for action.

Todd

Nice!

Awesome.

Something I'm curious about though:

How different are these manifolds as compared to the old LHD type? Aside from the logo now being on the "bottom" of course. Can we see a side-by-side comparison?

The flanges that mount to the head are inverted. The centers of the two fastening holes and the port don't lay on a common line nor are the fastening holes equidistant from the center of the port.
Simply flipping the RHD maniflod over results in a major offset of the ports. The main body of the manifold is essentially the same as the RHD model but with a larger WG mounting flange.

how is the flow in those manifolds ? must be quite much back pressure (with a relative small turbine)

raceaddic wrote:how is the flow in those manifolds ? must be quite much back pressure (with a relative small turbine)

The manifolds flow pretty good for street/track cars.
back pressure? what psi were you thinking of running ist not ment for 25-30psi if that is what you are looking for,you might want to use a tube style.

The TDC kit is mabe mainly for a bolt on big power upgrade with further improvment possabilitys.
sorry for the spelling.

raceaddic wrote:how is the flow in those manifolds ? must be quite much back pressure (with a relative small turbine)

T4 flange. Size the turbine and housing as large as you desire.

The flow of the manifolds is as optimized as a log can be. The runners are smooth with soft radius into the log. The log increases in size as the numbers of runners increase.

Does it flow as well as a well designed equal length tubular manifold? Of course not, nor is it designed to. What people never mention is that a great flowing equal length tubular manifold adds so much volume and decresed pressure that the turbo takes considerably longer to spool. In addition the boost is harder to control. Big volume tubualr manifolds require huge wastegates.

Each has it's merits. Building a car with a goal of greater than 500rwhp than a equal length tubular manifold is probably the best choice. IMHO it needs to be a tuned equal length manifold. A non equal length manifold probably adds no value over a log style cast manifold.

Building a daily driver street car? Go with a cast log manifold. A quality casting will likely last longer than the car and certainly the Owner's attention span.

Todd

T_C_D wrote:
Building a daily driver street car? Go with a cast log manifold. A quality casting will likely last longer than the car and certainly the Owner's attention span.

Todd

This is oh so true. Well put. Most people sell the car before a log manifold wears out.

As a point, I believe the manifold that Todd makes is superior in design to the Dinan manifold. Thats one reason his cars make more power at the same boost with lower octane fuel than my car.

RussC
Looking to have a TCD manifold on my E34 next year.

Plus, a cast iron manifold won't be as loud as a tubular manifold or radiate as much heat into the engine compartment.

While I believe the TCD manifold is superior to the Dinan M30 manifold I think it’s almost identical in flow characteristics to the Dinan M88/S38 manifold.

M635CSi wrote: While I believe the TCD manifold is superior to the Dinan M30 manifold I think it’s almost identical in flow characteristics to the Dinan M88/S38 manifold.

Does it have a tapered log?

M635CSi wrote:Plus, a cast iron manifold won't be as loud as a tubular manifold or radiate as much heat into the engine compartment.

While I believe the TCD manifold is superior to the Dinan M30 manifold I think it’s almost identical in flow characteristics to the Dinan M88/S38 manifold.

I haven't seen a S38 Dinan manifold? Is it different than the M30?

RussC

T_C_D wrote:

M635CSi wrote: While I believe the TCD manifold is superior to the Dinan M30 manifold I think it’s almost identical in flow characteristics to the Dinan M88/S38 manifold.

Does it have a tapered log?

Yes...

russc wrote:

M635CSi wrote:Plus, a cast iron manifold won't be as loud as a tubular manifold or radiate as much heat into the engine compartment.

While I believe the TCD manifold is superior to the Dinan M30 manifold I think it’s almost identical in flow characteristics to the Dinan M88/S38 manifold.

I haven't seen a S38 Dinan manifold? Is it different than the M30?

RussC

Yes, much different. The Dinan S38 manifold is very similar to the Dinan M88 manifold. I was surprised when I saw how different the M30 one was.

They used the Porsche 944 turbo air filter housing.

RussC

So how well will these fit under a LHD (ameeeerican).. 6 series?

What 6 series came with an m20?

doh! the whole time I thought it was for the m30!!

booker wrote:What 6 series came with an m20?

None.

M635CSi wrote:

booker wrote:What 6 series came with an m20?

None.

Really?

booker wrote:

M635CSi wrote:

booker wrote:What 6 series came with an m20?

None.

Really?

Smallest engine as I recall was the m30 based 628CSi, or the 633CSi in the US.