M20 Big Bore Throttle Bodies.

[DCColegrove]

Very true, ITB's are a bit extravagant.

D'bilas are nice but what I'm talking about are single units...6 45mm plates in an integral body using air bleeds to sync the idle.

If I reproduce them I'll tweak the design to work with 1.3 and include ICV function... New Motronic software would also be included.

[rs4pro3]

Like Nando said ITB's are not worth it, It took me 6 years to get a set running great on my car. Yes the power is amazing, and so is the throttle response, but it's for a pure high rpm breathing engine(I run it around 4k plus all the time). If I had to do it over again I would of purchased a setup from Dbilis and saved my self the headaches, but I just don't see them being anywhere worth while on a stock engine without major mods and some sort of programmable fuel injection. I think your best bet is doing Big bore throttle bodies, and maybe a high performance intake setup with a MAF conversion, M30 AFM, larger injectors, custom silicon intake boot etc....

[DCColegrove]

any discount for a bare but cleaned manifold? I want to do mine body color. :p

I'm still thinking on whether or not I'll do it at all (I hate porting...It's braindead work).

but if you want to try one out I might be inclined to work with you.

[nando]

oh yeah, $300 for a new TB sounds better. can you make one with a reversed throttle shaft for the E36 TPS? ;)

any discount for a bare but cleaned manifold? I want to do mine body color. :p

[DCColegrove]

there's another guy who does BBTB's for a little less, he's put a lot of work into them (proper venturi, etc), but I don't know how much he replaces. I assume for $300 you pretty much rebuild it.. I also have a core to use for that, but I don't know about spending $300 on it.

These would be completely new units.

I used to make them when e30 was king... I made some changes to the design in '95 (had a beter flow benches by then) and stoped producing them in 97.


and about the manifolds: Yes they are matched and I paint them... I'm not a big fan of powdercoat.

[e30s52]

depends on what day but yes i got some money lol

[DCColegrove]

make a big bore for us 24v guys

Hmmm... Got any money? (large TBs are still out there for you guys you don't need me for that)

[nando]

ported manifold for $200 sounds like a good deal. I have one sitting under the house for a core - are they port matched to the OEM gasket? Bead blasted? I actually want to paint mine a specific color so I don't care about powdercoating.

there's another guy who does BBTB's for a little less, he's put a lot of work into them (proper venturi, etc), but I don't know how much he replaces. I assume for $300 you pretty much rebuild it.. I also have a core to use for that, but I don't know about spending $300 on it. I think I'd rather put $300 towards exaust..

ITBs - unless you're building a race motor that screams to 7500rpm, not worth it IMO. Tuning is more difficult and you need a wild cam/high CR to take advantage of it. Maybe somebody will bite but good luck with this crowd. :(

so yeah - I like the idea of a ported manifold for $200. :)

[DCColegrove]

What kind of gains/improments did the TB and manifold produce (together or separately)?

Jon

A well done manifold will get you about 3 to 5 HP (plus smother transitions and better efficiency due to more even cylinder charging)

The only real advantage to big bore is top end response the curve flatens latter (like around 7 grand).

[Jon325i]

What kind of gains/improments did the TB and manifold produce (together or separately)?

Jon

[e30s52]

make a big bore for us 24v guys

[DCColegrove]

If...

I decided to produce these again how many would be interested in them at about $300 a pop.


And If...


I started Porting M20 Manifolds again how many would be interested at about $200 (PS they work way better than the Mud Honed bullshit).

Also If...

I were to produce 45mm ITB setups at about $2500 a kit would any one at all pony up for them?