From twin 45's to Throttle bodies

[RemaL]

OK been thinking I would like to do this int he future. take my Tiger Supercat from running Cards to throttle bodies. What would the benefits be? thinking better MGP and power?

Where to start. been a very long time since I have done any major mods to the Tiger.

I would rather go with proper car throttle bodies than bike ones

Any suggestions where to start looking

and cheers

[Paul.B]

Looking at the photo in your profile I'm guessing you have a Zetec engine? If so Weber do a full Kit c/w TB's, ECU. Loom etc for the Zetec. It is not cheap but a full plug and play setup. If you can entertain the thought of Bike TB's then talk to Chester Sports Cars. They do kits and I think some of their stuff runs Megasquirt which is fully mapped and mappable. The Weber kit is locked and needs an approved dealer to unlock.

[greengreenwood7]

i had 45's on my old Tiger, swapped to jenveys...i doubt that there was a power increase, dont know as it was a fresh engine....but what was apparent was the smoothness of the delivery and mpg...
i normally get 27-29 with a heavily tweaked engine and a lead right foot....pals with similar injection are getting 30-34mpg.

personally i'd steer clear of the webcon stuff unless you're ok with the mapping being restricted....upside is a map out of the box, downside is the hassle of getting a remap - if say you change the exhaust or any other engine component ( tuning )at a later stage.

[RemaL]

yea Zetec sorry i forgot to mention. Some interesting replays and thanks. Re the bike engine TB's, I would rather go for proper car TB's as I know a few who have had issues with bike TB's and also carbs.

I have my dyno set up at Tipton St John. recommended and one reason I want TB's is how they can be set up so much better than carbs. My tiger fuel gauge just drops at Mway speeds. 120-140 out of a tank max.

I'm going to also start a thread as I would also like to get a alloy tank for the tiger to increase the fuel capacity. Think is there does not seem to be many people local to me (Bristol) that i know does this?

Plan for the winter was, take the rear body work off and spray it up. Get and fit larger tank and put TB's on. Sell the Twin 45's.

Re the TB's, I seen I thinnk Omex system, they have a tapered TB kit and regular for the blacktop. is this just the angle of the TB's

[JamesHayward]

The Omex system is the one to go for. Worth every penny.

[RemaL]

Do you have it? Had my basic Omex ECu for almost 10 years and never a single issue

[jeffw]

http://omextechnology.co.uk/Omex%20Zetec%20Focus%2...

[one eyed mick]

MODIFICATIONS RULE1 more power =more fuel = less economy unless you drive like a saint you cannot have both ! end of

[RemaL]

one eyed mick said:

MODIFICATIONS RULE1 more power =more fuel = less economy unless you drive like a saint you cannot have both ! end of

more than aware of that, why I said I wanted a bigger fuel tank. not for the search of power & Speed, The fireblade is for that. But for a longer range when touring in the Tiger

[HolbaySS]

Had a friend do the swap from 45's to TB's on his Vauxhall engined Caterham.
Tipton did the work which came out at a reasonable £3k (ish)
Going to try Tipton to set up my Zetec 45's soon - hope they are as good as recommended!

[Paul.B]

one eyed mick said:

MODIFICATIONS RULE1 more power =more fuel = less economy unless you drive like a saint you cannot have both ! end of

So! Friction, rotating mass, breathing, exhaust flow, timing, mixture control, valve duration/lift etc, etc have nothing to do with 'More Power' then? Just more fuel?

Or to put it another way - because my twin 45's only give me 20mpg but TB's will give 25mpg then the 45's must give more power?

[JamesHayward]

RemaL said:

Do you have it? Had my basic Omex ECu for almost 10 years and never a single issue

I have it for the MX5 and yea not had a single issue. Granted I've not had it long but It's done 5000 miles and 6 trackdays and it's not missed a beat. Starts every time and idles beauftifully at 1,000rpm

[Stubby Pete]

JamesHayward said:

The Omex system is the one to go for. Worth every penny.

jeffw said:

http://omextechnology.co.uk/Omex%20Zetec%20Focus%2...

If you already run an Omex 600 series ecu, order the Jenvey throttle bodies from them and they might throw in a basic map for you to download. That will save you C£300 rolling road road time!

[PaulKemp]

Fuel injection is a more efficient way of delivering power therefore uses less fuel than thirsty Webers
Also smooths out fuel delivery where the webers would dump fuel
Result smoother delivery of power and better mpg
Throttle bodies are just tubes with butterfly valves in in
Roller throttles are considered the best as the have no restriction at WOT but need the pedal feeding in
Bike bodies at fine and can be used on a cut down Zetec inlet to great effect

[CorseChris]

Having done this to a xflow, it doesn't give any more peak power assuming the carbs are set up correctly, but it will give much better driveability throughout the rev range and likely a decent improvement in mpg. The area under the torque curve will be a whole lot bigger which makes if go a whole lot quicker too. It should also be totally fuss free once set up properly. I would advise that you budget for a decent RR session as well. A base map for a similar spec engine will get you going, but you really can't rely on it unless absolutely every aspect of the source map engine is identical to yours.

Our xflow used to have a huge hole until you hit about 2k5 rpm. After fitting injection, it pulled from 1k all the way to the rev limiter.

We now run the same ECU and tbs on a 2l silvertop Zetec engine. Apart from the GSXR tbs, decent exhaust and the Emerald, it's stock and makes a gnats under 170bhp with 152 torques.

Go for it, I doubt you'll be disappointed.

[RemaL]

well i've started save and going to keep a eye out and see what system I will go for