Author Topic: E30 M3 Tb (Read 6132 times)

Froos · « **on:** January 17, 2007, 04:31:42 AM »

Can they be used/modified or adapted to "tune" the M42 engine?? I can buy a pair (used) for about 400$.

Gunni · « **Reply #1 on:** January 17, 2007, 04:41:32 AM »

you should rather look into motorbike throttle bodies for about $50-90 on ebay,

Froos · « **Reply #2 on:** January 17, 2007, 04:53:09 AM »

Could do that, but that would involve a whole lot of sourcing and making parts. I like the idea of sticking to BMW parts, and m parts are welcome in my engine bay. But that is just my personal opinion.

Froos · « **Reply #3 on:** January 17, 2007, 04:56:05 AM »

here it is

asubimmer · « **Reply #4 on:** January 17, 2007, 07:31:01 AM »

IIRC there is a m42er that is using the s14 TB's but they had to make an adaper plate. But I could be wrong

I second the motorcycle ITB's though.

Froos · « **Reply #5 on:** January 17, 2007, 08:32:38 AM »

Ok thats 2, why would you guys preffer that setup? You will be searching for needles, float bowls levels and jets etc, no more injectors so what about ign timing? Disconnecting the wireloom....... plus you need to make adapters as well? I base this on the carbs I use on my bikes, but maybe I missing something and there is an ellement Im missing?

dino245 · « **Reply #6 on:** January 17, 2007, 08:59:17 AM »

Not carburators, Fuel injection throttle bodies from bikes such as the Hayabusa or zx12r. These throttle bodies are 4 indavidual throttle bodies that can be seperated and made to fit any engine. The E30 m3 engine is to wide and the bore spacing is of my 9mm per cyl. The bore spacing of the M42 is 91mm and not 100mm like the M10,S14,M30,M88,S38

It is very common for Honda tuners to use Motocycle Throttle bodies.

Gunni · « **Reply #7 on:** January 17, 2007, 09:21:36 AM »

Using the motorbike fuel rail, injector bosses and maybe even the injectors,
S14 throttle bodies aint going to fit without modifications,
the motorbike ones could be made to fit on the lower intake section of the M42 intake system

Alpine003 · « **Reply #8 on:** January 17, 2007, 09:52:59 AM »

I'm currently in the process of modifying an M10 motor(for my tii) w/ motorcycle tb's. If you plan on going custom efi, you don't have to worry about swapping in a compatible TPS. As for the injectors, a lot of modern sports bikes actually have better injectors with multiple jets for better atomization.

I know the Honda 900 injectors were rated around 240cc/min which is more than enough for any NA application below 180hp. Just take note on which ones you have and adapt accordingly(peak/hold or saturated)

Febi Guibo · « **Reply #9 on:** January 17, 2007, 10:46:06 AM »

if you can start a thread on this.... greatly appreciated!

Quote from: Alpine003;17709

I'm currently in the process of modifying an M10 motor(for my tii) w/ motorcycle tb's. If you plan on going custom efi, you don't have to worry about swapping in a compatible TPS. As for the injectors, a lot of modern sports bikes actually have better injectors with multiple jets for better atomization.

I know the Honda 900 injectors were rated around 240cc/min which is more than enough for any NA application below 180hp. Just take note on which ones you have and adapt accordingly(peak/hold or saturated)

Froos · « **Reply #10 on:** January 23, 2007, 04:29:16 AM »

Quote from: asubimmer;17699

IIRC there is a m42er that is using the s14 TB's but they had to make an adaper plate. But I could be wrong I second the motorcycle ITB's though.

I've seen pictures of this setup too, can you remember where or on which forums the pics were? I bought it anyway, if it absolutely wont fit ill sell it again, never lose money on M parts anyway. I have the tools(friend) to make an cast alu adapter so im willing to give it a go.

Alpine003 · « **Reply #11 on:** January 23, 2007, 09:05:58 AM »

Quote from: Febi Guibo;17718

if you can start a thread on this.... greatly appreciated!

There's really no thread to start at this point since the project is in it's beginning stages. But if you would like to see some pics of my ITB mated to my M10, then I suppose I can take some pics.

Froos · « **Reply #12 on:** January 25, 2007, 04:15:04 AM »

How much electronic hassle would be involved using TB of either a motorbike or m3? Is it just remapping the blackbox and using a different MAF? Or do you change to a fully custom wireharnass?
Gtrs F

Alpine003 · « **Reply #13 on:** January 25, 2007, 10:16:50 AM »

Quote from: Froos;18157

How much electronic hassle would be involved using TB of either a motorbike or m3? Is it just remapping the blackbox and using a different MAF? Or do you change to a fully custom wireharnass?
Gtrs F

It's a lot harder than that. Assuming you have a standalone ecu, you'll have to ditch the MAF and go with either tuning off Map values or the Alpha values off the TPS position. IMO, unless this is a track car or you have lots of time and patience to tune a map across all various part throttle driving conditions/loads, the returns are simply not worth the hassle.

StreetSpec_iS · « **Reply #14 on:** January 28, 2007, 07:18:16 PM »

i saw s14 throttles fitted to an m42 once. they had to make an adapter plate and also had to cut a chunk out of the plenum to clear the brake booster.

good luck if you go through with it.