Any one running throttle bodies on an exocet

[davetherave]

Hi all was thinking do throttle bodies make much difference to the performance of a 1.6 thanks

[Stewart]

A team mate has almost finished his NA build with throttle bodies.
He's aiming for 300hp from the 1.8

[davetherave]

That is a lot of power from the 1.8 do you no what other work he has had done to get it to the bhp

[dietcoke]

hopes & dreams.

[gwnwar]

Big hopes and dreams.. like pipe dreams..

[freshp5]

Been thinking about it

[gbob]

I met a guy at Doune hillclimb last week who's ITB'd 1.8 was kicking out 239bhp.
He had another £8.5k of supporting mods to get that though.

165-175bhp should be possible with a few supporting mods though.

[jwagner]

Sept 23, 2016 11:30:18 GMT gbob said:

165-175bhp should be possible with a few supporting mods though.

We're making 170hp+ at the crank with some head work, the usual bolt-ons, and a megasquirt with a good tune, so I would tend to agree with you.

300HP would be really pushing it with a Honda K20.  I don't think it's a goal even worth trying for with a Miata 1.8.

[johnp]

You know me - as technically proficient as a reed warbler - but if this can be achieved with a 1.6 why can't 300bhp come from a 1.8?

[jwagner]

Sept 23, 2016 18:17:26 GMT johnp said:

You know me - as technically proficient as a reed warbler - but if this can be achieved with a 1.6 why can't 300bhp come from a 1.8?

Independent throttle bodies, which I assumed is what the OP was referring to, are almost always used in normally aspirated cars.  300HP out of a turbo'd motor, like the one in the video, isn't that difficult if the motor is built to handle the power without self destructing.  300HP from a normally aspirated 1.8 would require serious mechanical magic, to the point that it would just be cheaper to start with something made to put out that much power.  It's not too difficult to get 175-180bhp from a normally aspirated engine with the right parts, getting above 200hp it's easier and cheaper to throw a turbo on it.

[davetherave]

thanks all so what ITB would you go for

[davetherave]

thanks all so what ITB would you go for

[gwnwar]

You can get them for $800.00 and up.. Then starts the tuning..

[jwagner]

I'd hit miata.net for more info on ITBs. There's at least a couple of threads there and probably some folks that have experience with them.

[kiwicanfly]

Sept 23, 2016 19:20:36 GMT jwagner said:

 300HP from a normally aspirated 1.8 would require serious mechanical magic, to the point that it would just be cheaper to start with something made to put out that much power.  It's not too difficult to get 175-180bhp from a normally aspirated engine with the right parts, getting above 200hp it's easier and cheaper to throw a turbo on it.

Whilst I don't know whether 300 is possible with a Mazda engine I have been reading a book where it was described how 223 was achieved from a NA Zetec 2.0. This was back in 2003.

The head was ported and polished, twin throttle bodis were added, the header inlet port length optomised, revs upped to 8500, head skimmed, new cams, bigger valves, bigger injectors, exhaust optomised plus other work.

This was of great interest to me as, within our club events, the addition of forced induction sees your engine capacity multiplied by 1.7 thus classing a 2.0l engine as a 3.4l and competing with everything above 3. 0l.

Thus whilst it might be cheaper and easier to add a turbo or supercharger I am starting to look at going down the NA route instead.

In addition to the class at club events it is also a very interesting challange!

Simply adding a set of ITB's would indeed improve things but more work can add lots more, as well as cost of coarse!

However 300 from a similar power base engine does sound rather optomistic.