ceebmoj
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| posted on 7/1/14 at 10:58 PM |
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Dutatec injectors on throttle bodys
I have been looking at a number of throttle body setups for the Duratec. and they seem to that seam to have the TBs drilled to take injectors as well
as the direct to head injectors in the Duratec. So where is the best location for the injectors in the head or out by the TB? or do people run 2 sets
of 4 injectors?
http://www.raceline.co.uk/products/part_section.asp?SectionID=13&CategoryID=1
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edthedrummer
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| posted on 7/1/14 at 11:04 PM |
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the standard duratec has the injectors in the head, aftermarket throttle body set ups usually mount the injectors in the throttle bodies and come with
blanking plugs for the head mounted injector ports.
I would guess that the injectors mounted in the throttle bodies are the way foward, considering most throttle body kits, designed to release more
power, have them mounted there. Look at SBDevelopments very own Taper throttle kits for example, which has had countless hours and money spent
developing it, the fuel rail mounts underneath, near the actual butterfly.
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peter030371
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| posted on 8/1/14 at 08:50 AM |
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I had the same question recently.
Omex have told me that they find injectors in the TB more 'reliable' than head mounted. I am off to Autosport tomorrow to see them and
getting more details on this is one of my questions to ask 
This is also an interesting read linky
The angle and position of the injectors on my GSXR TB looks very similar to the SBD setup so I am going to try and get as close to this as I can
Info sheet
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MikeRJ
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| posted on 8/1/14 at 06:44 PM |
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In general you want the injector as close to the valve as possible for the best emissions performance, and as far away as possible for best power.
This is why the injectors are mounted outside the throttle body, spraying into the ends of the trumpets on high performance applications (e.g. some
modern superbikes, formula 1 engines etc.).
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Mr C
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| posted on 8/1/14 at 07:10 PM |
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I've also been looking for TB's for a Duratec, so am particulary interested in this discussion. I understand that longer trumpets also
increase power particulary torque. For installation reasons (space) I'm favouring the DTH bodies from raceline, be interested to see what you go
for.
Girl walks into a bar and asks for a double entendre, so the barman gave her one
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edthedrummer
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| posted on 8/1/14 at 07:18 PM |
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A downside to mounting the injectors further away from the valves is the time taken to re-establish the mixture upon application of the throttle,
presuming deceleration fuel is turned off. Whilst this takes only a moment, it can provide a small noticeable hesitation when you get back on the gas.
It's fairly simple to get around this however, by only cutting fuel for a small section of the rpm whilst off throttle, and re instating it
before you actually accelerate. All this is map work though.
Also, on a side note... If the injectors aren't in the head, and are at the end of the throttles, don't use a fuel cut as a limiter... You
will hit the limiter, the injectors will turn off, but the fuel mixture remaining inside your throttle bodies will still enter the chamber as normal
and the revs will still rise, perhaps only, but back in the day, when fuel injection trickery was new to Motorsport, there was a fair few blown
engines on the start line at one event...
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edthedrummer
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| posted on 8/1/14 at 10:05 PM |
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quote:
Originally posted by Mr C
I've also been looking for TB's for a Duratec, so am particulary interested in this discussion. I understand that longer trumpets also
increase power particulary torque. For installation reasons (space) I'm favouring the DTH bodies from raceline, be interested to see what you go
for.
Longer trumpets don't really increase power. Its a bit of a grey statement to be honest, and there is quite a lot of misunderstanding.
Both the inlet and exhaust length can be tuned to the engine, by shortening the inlet tract, the power curve is lifted upwards generally, but at the
sacrifice of torque lower down. The opposite is true for lengthening the inlet, a long inlet tends to bring the power curve down at the top end,
promoting a bit more torque lower down the rev range.
Ed.
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ceebmoj
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| posted on 8/1/14 at 10:22 PM |
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Thanks for all the information guys does any body know how much the SBD throttle body kit for the duratec is? I suspect I cant afford it by a long
shot but would be interested to know.
[Edited on 8/1/14 by ceebmoj]
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edthedrummer
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| posted on 8/1/14 at 10:25 PM |
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I think the taper throttle bodies themselves are £1300 ish for just the inlet, if you want the loom, injectors, ecu and inlet kit then its about £3k.
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Mr C
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| posted on 9/1/14 at 03:21 AM |
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Advanced Automotive do a Jenvey/Omex kit for just under £2k, (straight not tapered) I'll probably go for the raceline bodies, emerald ecu from
retroford and wiring loom from emerald themselves, works out a tad cheaper and the loom is literally plug and play. Not sure about an airbox as
I'm doing a mid engined install and access/room is tight.
Girl walks into a bar and asks for a double entendre, so the barman gave her one
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