jimbona2
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| posted on 28/3/08 at 04:00 PM |
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how tricky is this fuel return to setup and is this the only difference? unfortunately i just bolted the fuel pump in, i assume the wrong one for TBs
as I got the fuel pump from the original bloke that sold me the build.
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stevebubs
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| posted on 28/3/08 at 05:37 PM |
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quote:
Originally posted by big_wasa
So what happened to the mondeo efi ?
Ditto - if you're looking for cheapest option, then the standard mondeo system will get you up and running and through SVA...
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Paul TigerB6
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| posted on 28/3/08 at 05:46 PM |
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quote:
Originally posted by jimbona2
how tricky is this fuel return to setup and is this the only difference? unfortunately i just bolted the fuel pump in, i assume the wrong one for TBs
as I got the fuel pump from the original bloke that sold me the build.
If you run a swirl pot in the engine bay you need the standard pump to feed it so you are fine with it.
Just not 100% sure whether you need to run the top outlet as a return to the main tank in which case its just a second copper fuel line running down
the tunnel and then figuring out a way to return the fuel into the tank, or as a breather. It seems to depend on the injection fuel pump you are going
to use.
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jimbona2
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| posted on 30/3/08 at 05:52 PM |
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hi guys,
i always hear this Megasquirt brand being mentioned, can I ask why? is it the best performer, easiest to install, cheapest??
cheers
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Schrodinger
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| posted on 30/3/08 at 08:20 PM |
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quote:
Originally posted by jimbona2
hi guys,
i always hear this Megasquirt brand being mentioned, can I ask why? is it the best performer, easiest to install, cheapest??
cheers
Cheapest after market as you buy the bits and solder it together yourself.
As regards the swirl pot the top outlet could be used as a breather on a low presure carb system but not with f.i. high pressure as the pressure from
the hp pump will just spew fuel everywhere at low engine speeds surely
[Edited on 30/3/08 by Schrodinger]
Keith
Aviemore
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mark chandler
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| posted on 4/4/08 at 08:31 PM |
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"As regards the swirl pot the top outlet could be used as a breather on a low presure carb system but not with f.i. high pressure as the
pressure from the hp pump will just spew fuel everywhere at low engine speeds surely"
Not so, the EFI pump sources and returns its fuel to the swirl pot, as the volumn of fuel is a constant , the swirl pot just becomes a very small fuel
tank.
A carb type pressure pump keeps this tank topped up, no return required.
There is no high pressure in the swirl pot, this just exists between the pump and the injection rail, as you drive fuel is consumed by the engine, if
you had a perfectly sealed system you would not even need the low pressure pump, its purpose is really to prime the system.
Regards Mark
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MikeRJ
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| posted on 4/4/08 at 10:26 PM |
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quote:
Originally posted by mark chandler
There is no high pressure in the swirl pot, this just exists between the pump and the injection rail, as you drive fuel is consumed by the engine, if
you had a perfectly sealed system you would not even need the low pressure pump, its purpose is really to prime the system.
Right, and this is one reason a return from the swirl pot to the tank is a good idea. without this return, if the swirl pot is empty the low pressure
pump won't be able to fill the swirl pot as there is nowhere for the air to go (it will very slowly come out of the injectors when the engine is
spun over but it could take a very long time to bleed it all out this way).
The other is that by cycling the fuel between tank and swirl pot it doesn't get a chance to heat up like it would if it's just being
pumped between the fuel rail and the swirl pot mounted in a hot engine bay.
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jimbona2
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| posted on 7/4/08 at 09:41 AM |
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ok, got a better idea what it all means now, carbs are cheaper but need more maintenance, whereas bike carbs are more expensive but easy to live with,
and they can provide more performance by changing the settings through a computer. so in effect, the answer to can bike carbs offer more performance
is YES they can.
my only remaining question is what do I need to get a throttle body setup?
i know, that you get/ need the following parts for the carb root but I have no idea what I need for the TBs.
Carb root
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2 x twin 45 carbs,
Inlet manifold,
TPS,
Throttle linkage,
ECU,
Wiring Loom,
Trumpets,
Air filters
Throttle Bodies
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Throttle bodies (Yamaha R1 or Kawasaki)
ecu
high pressure pump
dont know what else ? 
anyone know what you need for TBs?
[Edited on 7/4/08 by jimbona2]
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MikeRJ
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| posted on 7/4/08 at 10:47 AM |
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quote:
Originally posted by jimbona2
ok, got a better idea what it all means now, carbs are cheaper but need more maintenance, whereas bike carbs are more expensive but easy to live with,
and they can provide more performance by changing the settings through a computer.
Not quite, bike carbs are basically the same as any other carbs, but you get one per cylinder and they have quite high flow capabilities.
Tuning them is by changing/modifying jets as it is on most other carbs.
For an ECU controlled fuel injection you need throttle bodies which is just a throttle in a housing with space of a fuel injection. Much, much
simpler than a carb, and fueling can be adjusted by hooking your computer up to the ECU. However installing and getting started with the set-up is
rasther more complex than using carbs.
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jimbona2
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| posted on 7/4/08 at 03:17 PM |
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hi,
just had a word with Chester sport cars and they only supply the TB kit with the webcon alpha setting which does not come with any software so it
cannot be changed??
so part a) of my question is where can I buy the package I want and b) if you cannot configure the settings yourself to squeeze every last bhp out
then can TBs really offer much more performance?
thanks again
[Edited on 7/4/08 by jimbona2]
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Paul TigerB6
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| posted on 7/4/08 at 04:15 PM |
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Chester Sportscars dont have a supplier for the MegaSquirt as they do for the MegaJolt so have no choice there.
Not sure who the best supplier is for this but plenty of people on here have one so i'm sure you will soon have a recommended supplier and be
able to get a map from someone. These guys do them assembled anyway
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jimbona2
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| posted on 7/4/08 at 04:25 PM |
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thanks for this. scholar engines do the pack for £2k ouuchhh.. but i still want it! 
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MikeRJ
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| posted on 7/4/08 at 04:49 PM |
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quote:
Originally posted by jimbona2
b) if you cannot configure the settings yourself to squeeze every last bhp out then can TBs really offer much more performance?
The problem with this is that unless you happen to own a rolling road then you won't be able to squeeze out every last bit of performance.
However, I personally wouldn't buy any aftermarket ECU that didn't come with the appropriate software.
If you want a reasonably priced commerical system with some of the best support in the business then get an
Emerald ECU.
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Paul TigerB6
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| posted on 7/4/08 at 06:44 PM |
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Cheapest way to do it Jim is to buy a MegaSquirt kit and solder it up yourself (i built a simpler megajolt easy enough)
Do a search on here for suppliers (here's one to start with right here )
You will then need a set of throttle bodies from a suitable bike such as the GSXR1000 or similar - i'm sure others more knowledgable will advise
suitable sizes but maybe
these??)
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