trialsman
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| posted on 10/12/09 at 02:44 AM |
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Bike carbs vs throttle bodies
You guys are the experts on using bike carbs/TB's on our cars. I have a Suzuki Swift GTi 1300cc motor that I want to put in my locost. I plan to
have Megasquirt and EDIS to run it. I would like to use GSXR 600 carbs/TB's. Which would be better to use? Which is cheaper? I will not have
access to a rolling road to test it so all tests will be on the open road. Thanks, Russ
[Edited on 10/12/09 by trialsman]
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will121
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| posted on 10/12/09 at 07:26 AM |
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does the swift GTi have separate ignition spark control from the injection? if so the carbs would be a easier cheaper route and easier in my opinion
to set up, if ignition/injection from a single ECU then throttle bodies and megasquirt alternative, but needs some reading and knowledge, which i feel
i havent got so im going the emerald ECU route but with RR costs will end up being about a £1000, where as my carb set up (on a CVH) was about
£150.
as edit do you need to comply with any specific emmision regulations??
[Edited on 10/12/09 by will121]
[Edited on 10/12/09 by will121]
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matt_gsxr
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| posted on 10/12/09 at 09:48 AM |
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I have a gsxr1100 in my car. It was equipped with carbs, and now is has megasquirt driving gsxr600 tbi's.
The benefits are that you can tune it without having to buy loads of bits (i.e. needle kit from dynojet is £100 and might not work!). Also old carbs
will need a complete rebuild (15 year old fuel seals in a fiberglass car = recipe for disaster), and MOT and IVA is tough.
The whole world runs EFI for a good reason!
In terms of cost:
TBI's £70
MS kit £150
Modified fuel rail £50
LC-1 (for AFR) £150
You can delete LC-1 and add rolling road instead, but that isn't the ethos of this group and can get expensive.
Going EFI is a bit more complex, but its worth the effort in my opinion. If you have loads of experience with bike carbs and a big box of spares,
then I am sure you can get the same performance from carbs (if not the economy and cold start flexibility).
Just opinions though,
Matt
Edited to say, hadn't appreciated you were in the US, all the bits will be cheaper than the UK!
[Edited on 10/12/09 by matt_gsxr]
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deezee
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| posted on 10/12/09 at 12:31 PM |
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I think carbs is a bit more locost and more for the builders out there.
You could buy a set of £30 ZX6R carbs and use the adjustable needles, maybe drill it out for the grand sum of £1 for a drill. Then pop on a megajolt
for £80. Carbs don't require a swirl pot or a fuel return on the tank either, making it more simple.
Throttle bodies are great for high end tuning a keeping emissions down. If your not in a competition or bothered about emissions, I'd go with
carbs.
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mad4x4
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| posted on 10/12/09 at 01:17 PM |
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So for TB's is there any the same spacing as GSXR750 Carbs?
Scot's do it better in Kilts.
MK INDY's Don't Self Centre Regardless of MK Setting !
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trialsman
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| posted on 10/12/09 at 01:24 PM |
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Emissions are not a major problem here but I am concerned about the environment. I have not seen Magajolt in the States. M/S seems like it has the
most support. I like the idea about using carbs with no return fuel line and I have lived with motorcycle carbs for over 45 years. Electronics scare
me. I understand the advantages of using EFI of the TB's but lack the experience that you young guys have with it. Decisions, decisions,
decisions....... Tks, Russ
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