M42/M44 ITB Kit Design

[MLM]

RHD is fine on stands. Stands are preferable in some respects as you need to access from underneath and above in the engine bay.

Heat wrap may give more power but also increase the risk of cracking. I have had 1 crack in use and had to filter through a few spares to find an uncracked one. Welding is possible but not easy due to constuction. I would line up a spare manifold now and maybe wrap it at your leaisure before swapping it out. That way you have a spare and the car off the road for the least time. All depends on your situation really.

[ohne lader]

Hi Lambertius!

The M42's original plenum volume is ~2 L. As you leave the intake length almost the original 350mm (if I am not mistaken), did you leave the airbox volume the same? Or does this modification needs the bigger plenum volume?

[lambertius]

RHD is fine on stands. Stands are preferable in some respects as you need to access from underneath and above in the engine bay.

Heat wrap may give more power but also increase the risk of cracking. I have had 1 crack in use and had to filter through a few spares to find an uncracked one. Welding is possible but not easy due to constuction. I would line up a spare manifold now and maybe wrap it at your leaisure before swapping it out. That way you have a spare and the car off the road for the least time. All depends on your situation really.

Yeah I've heard of the risks of cracking, though it should be pretty low in the real world. I was planning to wrap one and then just do a swap. Much easier that way, and no pressure on time or reassembly. I remember speaking to a wrecker and he was saying that the M44 headers were much better than the M42 and that he hadn't seen anyone come in to get new headers for a crack. Anyway, do what I can to squeeze out every little bit without opening the engine!

Hi Lambertius!

The M42's original plenum volume is ~2 L. As you leave the intake length almost the original 350mm (if I am not mistaken), did you leave the airbox volume the same? Or does this modification needs the bigger plenum volume?

This was a very coincidental question. I had just started analysing the different volumes of air boxes. The current air box is close to 8.0L due to restrictions with the parts Rama had available. Stuff that I read seems to suggest that 150~200% displacement boxes provide the best performance depending on RPM and intended use. Smaller airboxes improve low-end performance, larger ones open the higher end.

The current setup obviously improves performance, but I understand that like the throttle diameter, you basically want it as small as possible before the you 'choke' so I wanted to investigate smaller volumes. Going smaller should improve performance, but I also want to understand why. The simulation indicates that the smaller airbox was about 20% more efficient, but there are limitations with this kind of simulation though.

Anyway, it is enough for me to want to try it out for real, so I will be getting some parts made.

https://www.youtube.com/watch?v=Re81nyTM8Uc

https://www.youtube.com/watch?v=5B0CFqaDhcM

https://www.youtube.com/watch?v=Pieu--Byb1Q

https://www.youtube.com/watch?v=dYOxCz8qSAY

Visually it appeared that the smaller volume gives up less energy 'filling' the pulse chamber after each stroke.

One more thing I put up a new video on my YouTube Channel Yesterday https://www.youtube.com/watch?v=mJzrv2GfmiI

If you want to see a good video of the ITB kit, it will be going up on that Channel in a few months. Once I finish with the exhaust and airbox, everything that has been done will be turned into an episode on my channel! So Subscribe!

[ngampleh]

is the Rama m42/m44 flywheel for 215mm or 228mm clutch diameter?
I need flywheel with 228mm clutch diameter for my M42

thanks

[lambertius]

Rama said:

"It has 228, but m20 clutch that sits on a basically flat surface not std e36 one which sits down in a recess"

[benz-tech]

That 3.5L box looks like it might have a better chance at fitting in an E30 LHD

[Puksuttaja]

Hi,

I just yesterday discovered this ITB kit here and I had to create an account here because this is just too awesome!! I was thinking about buying the Dbilas ITB kit but now after reading from page 8-13 of this topic in one night I realised that I it is not so well engineered at all. Thank you Lambertius for doing all the research and making this kind of proper kit to be available for us all, even though I live in Finland and I reckon the company that is now making them is in Australia I need this  Some questions came to my mind when I read this topic, so here goes:

1. Will this kit fit bolt on to a Z3 with M44?
2.What happens to all the different sensors that are attached to the OEM intake manifold, for example DISA, and others?

3. Do I need to lenghten the throttlecable on LHD Z3 because the throttle linkage is a bit more far away than normal?
4. Will the MAF go on to the kit as normal?
5. Someone asked the price of this kit in Brintech facebook page and they answered 1400 dollars but didn't say was it USD or AUSD, does anyone know if this is in USD or AUSD? (I asked them on the facebook page myself but didn't get an answer yet)
6. Does the kit contain everything to be a straight bolt on kit?

Thanks in advance! 

Also I noticed that there has been a lot of conversation about exhausts. I have a 4-1 2 inch exhaust manifold and a sports catalysator (200 CPSI) in 2,5" and all the rest exhaust is 2,5" Simons catback. I know that it is a bit too large diameter but it gives a wonderful sound and even if I haven't been to the dyno, according to my ass dyno I haven't lost power in the low end so much that I would notice it. When I installed the 4-1 "Fulda steel" manifold and sports catalysator, (year after the catback installation) I think I noticed a slight improvement in midrange torque.

[lambertius]

Hi,

I just yesterday discovered this ITB kit here and I had to create an account here because this is just too awesome!! I was thinking about buying the Dbilas ITB kit but now after reading from page 8-13 of this topic in one night I realised that I it is not so well engineered at all. Thank you Lambertius for doing all the research and making this kind of proper kit to be available for us all, even though I live in Finland and I reckon the company that is now making them is in Australia I need this  Some questions came to my mind when I read this topic, so here goes:

1. Will this kit fit bolt on to a Z3 with M44?
2.What happens to all the different sensors that are attached to the OEM intake manifold, for example DISA, and others?

3. Do I need to lenghten the throttlecable on LHD Z3 because the throttle linkage is a bit more far away than normal?
4. Will the MAF go on to the kit as normal?
5. Someone asked the price of this kit in Brintech facebook page and they answered 1400 dollars but didn't say was it USD or AUSD, does anyone know if this is in USD or AUSD? (I asked them on the facebook page myself but didn't get an answer yet)
6. Does the kit contain everything to be a straight bolt on kit?

Thanks in advance! 

Also I noticed that there has been a lot of conversation about exhausts. I have a 4-1 2 inch exhaust manifold and a sports catalysator (200 CPSI) in 2,5" and all the rest exhaust is 2,5" Simons catback. I know that it is a bit too large diameter but it gives a wonderful sound and even if I haven't been to the dyno, according to my ass dyno I haven't lost power in the low end so much that I would notice it. When I installed the 4-1 "Fulda steel" manifold and sports catalysator, (year after the catback installation) I think I noticed a slight improvement in midrange torque.

Hey thanks!

I came on to update everyone on the next step in the project.

I'm heading back to Sydney in a few days, and part of the trip should involve finishing the fitment of the kit completely! I was intending to take some detailed photos of all the assembly, and show what happens to all the sensors and hoses. The kit will effectively be bolt on, but you will require at least some technical skills to install it.

1. Yes
2. Everything will be used except the DISA
3. No
4. Yes
5. The price is subject to change depending on final manufacturing costs. I believe that RHD will sell them at ~$1200USD but some costs are still pending.
6. No. There are too many variations in the cars that it will fit. It will contain almost everything, but there may be some specific changes that users will need to make for their own install. It should cover everything - but as it is not yet fully complete, I can't say for certain.

Also, if anyone wants to see what Britech actually does - https://www.youtube.com/watch?v=LT10-MJGitM - watch the video!

[Puksuttaja]

Ok, thanks. I am a automotive engineer student so I think I can figure it out even if it need a few minor modifications  I would possibly be interested in the light flywheel kit that you are planning on too 

[lambertius]

An update for all you LHD folk out there





Work is still ongoing, there will be more updates soon!

So who wants one now you've seen it fitted?   

[jrw21]

I want one!!! 

[MLM]

Did you have to compromise the runner length to make it fit? It looks shorter than the RHD version??

[M42002]

Registered here just to follow this thread. I'm putting an m42 into my 76' 2002. I'd love to add this sometime down the line.

[lambertius]

Did you have to compromise the runner length to make it fit? It looks shorter than the RHD version??

This particular kit is shorter yes, he wanted to get it under the strut bar. It is only 50mm shorter than what I ran, but you would be able to extend out a bit further with some spacers. I'm sure you can see there is still room between the brake-booster and airbox! In other words, it will definitely fit at a useable length!

I'm testing a slim kit at the dyno tomorrow, if that works out you would be able to run a little bit longer as well.

There is a lot more to report on what's coming up, but I'll keep it till I have results!

[Puksuttaja]

That looks so awesome!  I want one badly, so when can we buy these works of art?