Throttle bodies on the cheap??

Level 5 User Joined: 04 May 2004 Posts: 107

Please tell me if there is an obvious flaw in this idea.

Seems to me that throttle bodies are basically carbs with individual injectors in each one, and maintain 3D engine mapping via use of various sensors.

Being as Renault kindly fitted my 19 with 4 injectors and these sensors already in place and (most of the time) working normally, could I not fit a pair of twin carbs, say DCOE 45s, and blank off the fuel supply connections, maintaining the stock fuel rail/injector setup and TPS/ MAP sensor etc.

Basically treat the carbs as throttle bodies but with the injectors mounted in the head rather than in the throttle bodies themselves?

Then have a unichip fitted and remapped so everything works perfectly and my car is great.

Am I being clever or retarded?

Thanks.

Forum Moderator Joined: 16 Feb 2004 Posts: 1356

Some throttle bodies don't use injectors, although they have the 'boss' if thats the correct term to fit injectors.

Problem is each runner has its own 'TB'. You can't run the map sensor from all four TB's.

Your being half retartded and half bright, I don't fullyunderstand them.

TB's are a lot of work though. Need to source the bodies, fabricate a manifold, sort out the engine management as the stock ECU coulnd't run them. I think a few people are looking into re-designing the plenum chamber on the standard manifold

Forum Moderator Joined: 02 Mar 2004 Posts: 19978

No it won't work right and it will not work with some unichip on the back either.

It may run and you may get extra power but nowhere near what it would get if it was done properly.

As for the injectors, yes these could be used. And yes you could convert weber carbs to throttle bodies.

That would be ok.

Basically you can do it properly or half arsed, half arsed is tryign to retain MAp control etc etc, no point at all.

Properly is using a new FULLY programmable ECU.

A unichip is a piggy back chip, all it does is change the signals from the sensors and thus makes the ECU give out different instructions. These different instructions are still within the ECU's various maps.

if you need a pulse width of 80ms and the ECU only has a max of 70ms then it doesn't matter if it needs 80ms it can only get 70ms.

This is very simplified but you get the picture.

Level 5 User Joined: 04 May 2004 Posts: 107

Got ya.

So with a new management system it might work and still be a bit cheaper than buying 'proper' throttle bodies, but I guess for the hassle of getting it all to run right, it would be better spending more and getting a proper set.

cheers

Gay Rights Activist Joined: 07 Apr 2004 Posts: 1268

if u can make the bodies urself from old DCOE's then do it, u could pick up an Emerald managment system for Â£500. then it would be cheaper. + there is R/R time for mapping which wil be another couple of hundred.

or i can get my hands on some Jenvey bodies 4 u.....