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throttle bodies or carbs
ch1ll1 - 12/10/06 at 01:24 PM

hi all,
ok my new project is under way ,
just about to order m/s will be using a blacktop 2l zetec,
should i run throttle bodies or good old twin 45?
whats your view and why
cheers in advance

[Edited on 12/10/06 by ch1ll1]

bimbleuk - 12/10/06 at 02:58 PM

I used to have a Corolla GTi with twin 40 Dellorto carbs and I still believe that was the best sounding engine I've owned.

It did need regular tuning to keep it perfectly setup so now I would always choose TBs instead. Oh and it did seem to drink like the proverbial fish as well.

[Edited on 12/10/06 by bimbleuk]

zetec7 - 12/10/06 at 05:09 PM

I'm doing the same thing, and after much deliberating, decided to go with 45DCOEs....

DIY Si - 12/10/06 at 05:11 PM

Carbs sound better, are simpler to fix/ set up in many cases. TB's give better mpg, often better power due to near perfect fueling and can be cheaper to source.
Oh, if I could make a megasquirt set-up I'd go that route. It would also give many an excuses for going for a drive. "just popping out to set the engine up darling, back tomorrow......"

[Edited on 12/10/06 by DIY Si]

nre - 12/10/06 at 05:30 PM

I've had both on my zetec. The TBs sound very similar to twin 40s, apart from the lovely roar the TBs seem to give at the top end

mpg on TBs is 15% better at ~36mpg on a 1.8 silvertop.

Tweaking TBs is way easier. A tap or 2 on the keyboard is all that's required...

I'd never go back to carbs...

...especially given it doesn't cost all that much more to do a bike TB setup.

Neil

orbital - 12/10/06 at 08:53 PM

Hi all,

I've got a part built Mac#1 ZR over in my parents garage (the road to getting my garage ready has been a long one!). Now I'm a complete novice to all this kit car malarky (make that cars in general) and one thing I see a lot written about here and there are throttle bodies. Could someone explain what exactly throttle bodies are and how they differ from carbs?

Uphill Racer - 12/10/06 at 11:01 PM

Carbs.................?............u wanna pose or go fast?
Cant make a carb but can design n build an injection system.

http://i72.photobuhttp://www.prolong.comcket.com/albums/i187/uphill-racer/THROTTLEBODY.jpg

http://i72.photobucket.com/albums/i187/uphill-racer/INJECTION1.jpg

http://i72.photobucket.com/albums/i187/uphill-racer/INJECTION1.jpg

easy aint it..........

greggors84 - 13/10/06 at 12:45 AM

quote:
Originally posted by orbital
Hi all,

I've got a part built Mac#1 ZR over in my parents garage (the road to getting my garage ready has been a long one!). Now I'm a complete novice to all this kit car malarky (make that cars in general) and one thing I see a lot written about here and there are throttle bodies. Could someone explain what exactly throttle bodies are and how they differ from carbs?


Carbs use the air coming into the engine to suck the fuel through and mix with the air. This is controlled via floats and jets.

Throttle bodies have injectors in them, its not much more than a pipe with a throttle (normally a butterfly) to control the amount of air coming in. The ECU knows how much fuel to pump in via the injector by knowing the position of the throttle and a combination of other things.

TBs are a more precise way of doing things, carbs are more mechanical, and complex as they have more moving parts etc.

orbital - 13/10/06 at 07:44 AM

Right, so, if you have carbs everything is there ready to go, if you go TB's you need the bodies themselves and an ECU unit to control the injectors correct?

zetec - 13/10/06 at 07:46 AM

TBs the way to go. My car will start first time every time first flick of the key...no matter if it's -10 or 30 deg outside. If your running a zetec you'll need an ECU for the sparks so getting one to run the fuel is no more hassle. Something like the Emerald will also control the fuel pump, cooling fan, rev counter, shift light and data logger/diagnostics for all the engine sensors. Couldn't go back to carbs now.

orbital - 13/10/06 at 08:20 AM

This all sounds quite complicated. Have you ever had that feeling you may have bitten off more than you can chew!

JackNco - 13/10/06 at 02:02 PM

quote:
Originally posted by orbital
This all sounds quite complicated. Have you ever had that feeling you may have bitten off more than you can chew!


Im in the same boat as u mate, its bloody complicated but as i read more piece are falling in to place

Either way u need some kind of ECU

if ur on carbs u need an ignition only ECU
about 100.00 for a megajolt unit plus some bits n bobs from an old ford. www.megajolt.info if u get stuck give brent an email hes a massivly helpful guy

if u go injection alot of ppl use megaSQUIRT that a stand alone ECU that costs about 250+ to be honest aftr reading this thread im considering going injection, alot of ppl seem 2 thing is worth the extra cost.

John

paulf - 13/10/06 at 08:20 PM

It need not work out much more expensive , the carbs still need a manifold and as said an ECU for ignition etc.
Also with carbs you have little choice other than to have them set up on a rolling road which can easily cost £200 plus and involve changing jets etc.
With Injection it can be roughly tuned by setting basic settings to get the engine running and then fine tuned using dataloging and auto tune features built into the megasquirt software whilst enjoying driving the car.
I have fitted megasquirt to my car and havent had to spend any money at a rolling road to get good results.
Paul.

quote:
Originally posted by JackNco
[if u go injection alot of ppl use megaSQUIRT that a stand alone ECU that costs about 250+ to be honest aftr reading this thread im considering going injection, alot of ppl seem 2 thing is worth the extra cost.

John

stevebubs - 13/10/06 at 08:25 PM

quote:
Originally posted by nre
I've had both on my zetec. The TBs sound very similar to twin 40s, apart from the lovely roar the TBs seem to give at the top end

mpg on TBs is 15% better at ~36mpg on a 1.8 silvertop.

Tweaking TBs is way easier. A tap or 2 on the keyboard is all that's required...

I'd never go back to carbs...

...especially given it doesn't cost all that much more to do a bike TB setup.

Neil


Ditto

Stephen

orbital - 13/10/06 at 08:43 PM

Is the Megasquirt the one you have to assemble yourself from a kit?

Cheers for all the info guys, I can see me asking a lot more questions over the coming months so please bare with me!

JackNco - 14/10/06 at 05:48 PM

Ya megasquirt is the one u do from a kit. http://megasquirt.info i think

any one know the expected BHP out of a zetec 2.0 on MS and TBs?

Peteff - 14/10/06 at 07:28 PM

Which is the one that replaces the Ford Edis module and which throttle bodies are easiest to work with, any in particular or are they all pretty much the same for 1800 Zetec or similar?

DIY Si - 14/10/06 at 08:09 PM

I'd suggest bke versions being easiest, partly because of there availability and price compared to others, ie Jenvey.