Larger throttle body? Info? Power gains

[tim_s]

just to add my experiences. bigger throttle body gives a little more on full throttle but really is a bit of a waste of time - you'd be hard pushed to tell the difference. i have the same +4mm one that omi has, ian (alpina357 on uk forums) uses an engineer friend of his to add a 4mm larger butterfly to the large butterfly, the body is nicely drilled and ported to flow with it. it's nice to have a recon'd unit though, it opens very smoothly etc.

SMT6 = waste of time. Didn't work well with our AFM. I also tried to use it for a MAP conversion, this was tedious and didn't work that well.

MS is very good. I'm now running an MS2 extra which is even better. I don't agree with bmwman about the gains on a standard M42, I fitted MSNS+HR on dan318is' standard M42 a few months ago, and just running an old map of mine it feels more lively, faster with better response.
When I had my 1.8 on the rollers, I managed to squeeze nearly 10hp on factory by using megasquirt, and that's not the whole story - throttle response etc was much better.
I agree on it being a pita to get the hang of, but once you know what you're doing you can come up with good maps in no time.

[ose30]

SMT6 = waste of time. Didn't work well with our AFM. I also tried to use it for a MAP conversion, this was tedious and didn't work that well.

SMT6 does not work well with MAP sensors, this is a well known problem. With MAF sensor it works much better.

[nickmpower]

just to add my experiences. bigger throttle body gives a little more on full throttle but really is a bit of a waste of time - you'd be hard pushed to tell the difference. i have the same +4mm one that omi has, ian (alpina357 on uk forums) uses an engineer friend of his to add a 4mm larger butterfly to the large butterfly, the body is nicely drilled and ported to flow with it. it's nice to have a recon'd unit though, it opens very smoothly etc.

are you interestid in selling the TB? seems like you wouldnt have a use for it

[Royalratch]

So what's the verdict here? Big bore is a waste of time?

I'm doing a re-map for my M44 and was going to throw a bigger throttle in but now I'm not so sure?

[bmwman91]

just to add my experiences. bigger throttle body gives a little more on full throttle but really is a bit of a waste of time - you'd be hard pushed to tell the difference. i have the same +4mm one that omi has, ian (alpina357 on uk forums) uses an engineer friend of his to add a 4mm larger butterfly to the large butterfly, the body is nicely drilled and ported to flow with it. it's nice to have a recon'd unit though, it opens very smoothly etc.

SMT6 = waste of time. Didn't work well with our AFM. I also tried to use it for a MAP conversion, this was tedious and didn't work that well.

MS is very good. I'm now running an MS2 extra which is even better. I don't agree with bmwman about the gains on a standard M42, I fitted MSNS+HR on dan318is' standard M42 a few months ago, and just running an old map of mine it feels more lively, faster with better response.
When I had my 1.8 on the rollers, I managed to squeeze nearly 10hp on factory by using megasquirt, and that's not the whole story - throttle response etc was much better.
I agree on it being a pita to get the hang of, but once you know what you're doing you can come up with good maps in no time.

Was the 10hp gain versus a stock chipped M42?  A Conforti chip adds almost that much power.

Now as far as all the other benefits of stand-alone and a MAF I totally agree.  The car feels better than new with the MAF on there as far as liveliness.  On a stock-internal M42, the AFM flows enough.  On a modified engine, you might want to consider ditching it.

[steinkek]

Wow im a noob and you guys have me so lost.......what is megasquirt?
MS and MS2??

[jpod999]

MS stands for MegaSquirt.  MS2 stands for MegaSquirt 2.  Megasquirt is custom tunable ECU I believe.  It's known to be cheaper than the big company names.

[tim_s]

Was the 10hp gain versus a stock chipped M42?  A Conforti chip adds almost that much power.

Now as far as all the other benefits of stand-alone and a MAF I totally agree.  The car feels better than new with the MAF on there as far as liveliness.  On a stock-internal M42, the AFM flows enough.  On a modified engine, you might want to consider ditching it.

yeah, was about 7hp at the wheels iirc, something like that, was a few years back now! and yeah i don't doubt that a chip would do pretty much the same! A good chip i'm sure would do pretty much exactly what we altered on the rollers - i suppose the difference is it's not off-the shelf and will be spot on for your actual car etc., also I use EGO control and AFR targetting, so i know it will get that optimum AFR every time.

[black318i]

So what's the verdict here? Big bore is a waste of time?

1+

I'm thinking about doing this, but I don't want to wast my money. I'm keep my AFM for smog reasons. Right now I have a DASC and exhaust. I have a unichip wired up but not installed with a good base map that needs some fine tuning.

[gearheadE30]

There was a guy over on bf.c. who had a dinan TB on his m42. Anyone heard of this?

[black318i]

I read that tread a while ago and I’ve been trying to find it. I remember he did say throttle response was better, but I can’t remember if it was installed on an m42 or m44

[gearheadE30]

It was on an m42, and he didn't even realize it was on the car until he took the intake apart to clean it or something.

[DutchM42]

I have the Alpina527 enlarged throttlebody. To be honest, I don't feel any difference. A friend of mine put one on his M43B19TU and had a superb increase in throttle-response.
I think the M42 TB already flows enough air.
I had the chip replaced, and that made a big difference. Better spend the money on a good remap.

[Royalratch]

So M42 TB's are different to M43/M44?