Author Topic: ITB's for the M42 (Read 14153 times)

M42Technik · « **on:** March 13, 2006, 02:03:53 AM »

Maybe Tim_S can help us out with where to find one? Give us all you got on that beautiful piece of work in that engine bay you have going...

bmwman91 · « **Reply #1 on:** March 13, 2006, 02:56:56 AM »

Most folks use the TB's from Suzuki GSXR 1000's, maybe 750's. Some have used S14 ones (heavily modified to fit). It has been done on a few M20's (dare I mention that bastard motor here?!). I have seen a couple M42's with the custom job. http://www.gttechnic.com has a kit for the M42. They do GT2/GT3 M42 powered cars...they also carburete the M42's. Anyway, that's the deal.

Sidenote, http://prof.e30tuner.com/ has some designs of mine for custom intake setups. There are renders on the little menu to the left of the site.

tim_s · « **Reply #2 on:** March 13, 2006, 04:34:20 AM »

Bmwman91 has missed a few things, so will clarify:

s14 throttle bodies work terribly in the m42 as the bore spacing is all out so you have to plug up the exisiting injector holes and make a pita manifold for the injectors. if you don't do this the injectors will fire into the side of the inlet ports. to get it all nicely port matched to an m42 head is difficult too due to difference in size of ports + bore spacing. even when done its such a compromise that its probably not the way to go.

motorbike throttles are a better idea. have similar problems to the above due to bore spacing etc, they're also generally a bit insubstantial. the gsxr bodies are also all one piece, one's that have separate tbs that you can assemble are probably better cos then you can build a custom throttle bar etc and get them to mate to the m42 head better.
the dia. is often a bit small too, probably good for a standard car as will give nice throttle control, would have thought they have their limitations when you get modifying.

the gttechnic throttle bodies look nicely done, they would be great for track use, but they are useless for road use though.
Besides this, they will also require alpha-n fuelling as they are without an intake plenum. quite a good price at about $1100 without air horns, $1300 with.

think you'd be mad to use the gttechnic kit on a road car, when the dbilas setup (or mb the BMPDesign - never seen one) has to be the best option. I'm quite a fan of the dbilas kit for its ease of installation - it is truly bolt on, and looks pretty cool. but in comparison to my setup, there are such big sacrifices made in order for it to fit with all the stock stuff (AFM, airbox etc). If they had accepted that it won't fit with the stock airbox and AFM location, they could have designed the intake plenum and air horns to be much more effective.

mine are different again to all of these btw fellas!

for ref here's some pics of some various ITBs on M42s:
dbilas with alloy catch tank and soime other goodies (still on AFM though):

a decent setup on an s42 rep, not sure what this is:

my setup

i should get some better photos of it all mated together, a bit short of time at the mo though.
HTH
tim

bmwman91 · « **Reply #3 on:** March 13, 2006, 01:11:07 PM »

So which TB's did you use? It looks like a pretty mean setup. And the dual injector bungs...are you looking at going FI and injecting water/alcohol, or are you just going to do some sort of sequential fueling? Very neat!

nickmpower · « **Reply #4 on:** March 13, 2006, 01:52:59 PM »

they look like euro s50? I'd love to do this but i dont want to get into all the engine manegment stuff

post all the details!!!

bmwman91 · « **Reply #5 on:** March 13, 2006, 03:19:04 PM »

Oh yeah NM. I recall him saying they were Euro S50 ones in another thread. Oops!

tim_s · « **Reply #6 on:** March 13, 2006, 03:35:45 PM »

lol yup! its not two rows of injectors mr bmwman, it has a vacuum rail too. dunno what you want to know about them really, were ok to fit, need a lot of modification to get them to fit as i'm sure you can imagine. think thats the appeal of the s14 bodies - they're easier to fit as they're 4 pot bodies to start with, you can just bolt them on using an adaptor plate and off you go, this is obviously not the case with these.
the work pays off though. now that its done, the setup is really good. the inlet path is perfect, really factory. if anyone's interested in doing some, like i've offered previously, i cna sort out parts and the modifications etc.
reckon i can build some up ready to go for �400 excluding the plenum.
I'd also be keen to have some CF intake plenums made up. mainly cos im not into doing more fibreglassing!

M42Technik · « **Reply #7 on:** March 13, 2006, 04:00:26 PM »

Don't tempt me with your ITB's! I need to save up some money right away if you're really going to start making them...

tim_s · « **Reply #8 on:** March 14, 2006, 12:35:43 PM »

Yes, I probably will make a few as have a few requests from people. Would like to get a few people together so that I can get some CF intake plenums made up for me really. making up the tbs is ok seeing i have mine as a template etc.

2002maniac · « **Reply #9 on:** March 14, 2006, 03:05:47 PM »

Here is the ITB setup I fabbed up for my M10 powered 2002. A similar setup could be made just as easily (wasnt easy though) for an M42. I used 38mm GSXR600 throttlebodies which will support PLENTY of power.

I am going to re-do the velocity stacks because I could get enough flare. I will be making billets.

tim_s · « **Reply #10 on:** March 14, 2006, 03:13:28 PM »

they're cool! be nice with some flared trumpets on there! those trumpets are pretty long. is that the m10 original manifold you've used?
what you doing for fuelling?
and whats the m10 they're going onto?!
nice work!
you in the uk too? u/n seems familiar?

2002maniac · « **Reply #11 on:** March 14, 2006, 03:32:46 PM »

Quote from: tim_s

they're cool! be nice with some flared trumpets on there! those trumpets are pretty long. is that the m10 original manifold you've used?
what you doing for fuelling?
and whats the m10 they're going onto?!
nice work!
you in the uk too? u/n seems familiar?

Yes, I used the manifold from a e30 318i (m10) as a base for my manifold so I could use the injector ports. I'll be using megasquirt to handle the injection, but that wont be for a while as the car is still in pieces. The motor was built when I got the car but the PO told me that it has 10.5:1 CR a schrick 304 or motorsport 300 cam and alot of port work. It had 45 webers on it when I got it.

I'm in the states.

bmwman91 · « **Reply #12 on:** March 14, 2006, 03:37:52 PM »

Very nice! I am quite impressed.

!RocknE30! · « **Reply #13 on:** March 18, 2006, 10:04:10 PM »

Those are all sex

Febi Guibo · « **Reply #14 on:** March 18, 2006, 10:49:06 PM »

W-O-W ...I'll be right over...!

Author Topic: ITB's for the M42 (Read 14153 times)

!RocknE30!