ch1ll1
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| posted on 12/10/06 at 01:24 PM |
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throttle bodies or carbs
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]
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bimbleuk
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| posted on 12/10/06 at 02:58 PM |
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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]
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zetec7
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| posted on 12/10/06 at 05:09 PM |
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I'm doing the same thing, and after much deliberating, decided to go with 45DCOEs....
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DIY Si
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| posted on 12/10/06 at 05:11 PM |
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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]
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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nre
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| posted on 12/10/06 at 05:30 PM |
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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
Sylva Mojo Zetec on GSXR750 throttle bodies...
www.mymojo.co.uk - Facebook feed
JPSC Forum - A dedicated forum for discussion on all things relating to Jeremy Phillips designed cars
Including the Star, Leader, Striker, Phoenix, Fury, Jester, Stylus, Mojo, Riot, J15 & Vectis
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orbital
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| posted on 12/10/06 at 08:53 PM |
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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?
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Uphill Racer
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 posted on 12/10/06 at 11:01 PM |
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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..........
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greggors84
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| posted on 13/10/06 at 12:45 AM |
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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.
Chris
The Magnificent 7!
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orbital
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| posted on 13/10/06 at 07:44 AM |
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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?
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zetec
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| posted on 13/10/06 at 07:46 AM |
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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.
" I only registered to look at the pictures, now I'm stuck with this username for the rest of my life!"
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orbital
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| posted on 13/10/06 at 08:20 AM |
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This all sounds quite complicated. Have you ever had that feeling you may have bitten off more than you can chew!
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JackNco
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| posted on 13/10/06 at 02:02 PM |
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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
Some people are worried about the difference between right and wrong. I'm worried about the difference between wrong and fun.
O'Rourke, P.J. (1989), Holidays in hell. London (Picador)
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paulf
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| posted on 13/10/06 at 08:20 PM |
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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
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stevebubs
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| posted on 13/10/06 at 08:25 PM |
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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
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orbital
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| posted on 13/10/06 at 08:43 PM |
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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!
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JackNco
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| posted on 14/10/06 at 05:48 PM |
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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?
Some people are worried about the difference between right and wrong. I'm worried about the difference between wrong and fun.
O'Rourke, P.J. (1989), Holidays in hell. London (Picador)
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Peteff
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| posted on 14/10/06 at 07:28 PM |
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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?
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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DIY Si
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| posted on 14/10/06 at 08:09 PM |
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I'd suggest bke versions being easiest, partly because of there availability and price compared to others, ie Jenvey.
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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