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[nemesis_v6]

has anyone tryed aftermarket throttle bobies i was thinking of goning for the omax kit from demon tweeks in the not so distant future but thought i would see if its being done and what they thought about it opions welcome ps how easy is it to gas up the air con if its poss to do your self

[Kevin Wood]

What engine are you considering doing this on? Not on an Omega, presumably?

I run a Westfield with a tuned 2 litre Zetec on Jenvey throttle bodies. Jenvey make the majority of throttle bodies of this type, some are sold rebadged. I would go direct to them http://www.jenvey.co.uk/ as they are extremely helpful and can be talked into giving you a better price than other resellers. They are not cheap but are very nicely engineered.

If you want to do it on a tighter budget have a look on ebay for fuel injection throttle bodies from bikes. These are basically the same thing, will need a little more fabrication to fit them on a car engine but can be had for a fraction of the price. You're looking for something from an inline 4, i.e. GSXR600 TBs for a smaller engine, GSXR1000 TBs will feed a tuned 2l car engine no problem.

You're going to need a mappable fuel injection system to drive these as well. I would recommend either something like and Emerald http://www.emeraldm3d.com/ or, again, if you're on a tight budget and are handy with electronics a Megasquirt http://www.megasquirt.info/. I would steer clear of the Weber / Webcon systems as they can only be adjusted by one of their dealers, and the whole idea of a mappable ECU is that you can get into it and tweak it!

A wideband Lambda sensor is also a wise investment if you're going to be playing with the maps, and can save a lot of costly trips to a rolling road. Something like an Innovate would do nicely :http://www.innovatemotorsports.com/

I'm running a Megasquirt on my car, and have been for 4 or 5 years now.

Let us know a little more about what you're trying to achieve and I'll see if I can give you any further pointers.

Regarding air con, I'd say the DIY kits are a waste of money. You really need to know how much refrigerant you're putting into an air con system and the pressure isn't a reliable indicator of this. It needs to be vacuumed out and refilled with the correct quantity. Kwik Fit are cheap at £44.95 but check my comments on here. Service is variable so you need to keep an eye on them and shout if you're not happy.

Cheers,


Kevin

[nemesis_v6]

yes i was going to try this on my 3.0lt v6 omega and thanks for the tip on air con will get it sorted at end of the month by some one thanks again kevin

[JamesV6CDX]

yes i was going to try this on my 3.0lt v6 omega and thanks for the tip on air con will get it sorted at end of the month by some one thanks again kevin

This is a personal opinion, but I don't see a huge point to modifying the Omega in this way. The 3.0 has plenty of power for british roads anyway as standard

[nemesis_v6]

yes for road driving but i would like about 300bhp eventaly for drag days and show some people that family cars can be just as quick

[Kevin Wood]

Individual throttle bodies will give you the best breathing possible at high RPM. However, for low to mid rpm torque, you need a decent length of intake tract (50 cm and upwards, as a ballpark, although it depends on RPM) so, if you don't have trumpets extending way out of the bonnet you will have much poorer low to mid performance. If it's a track car and it's always at the top end of the rev range, or you've got wild cams in it and they don't work well at low rpm that may not bother you but it's not ideal for a road car. You're far better off with the factory plenum and bagpipes setup on the road IMHO.

The other issue is that it's probably not worth touching the induction system on the Omega until the exhaust system has been properly sorted, as this will be the weakest link in the chain, specifically the exhaust manifolds. My first step if I were in your boots would be to have some nice tubular exhaust manifolds made up.

I'm not trying to pee on anyone's chips here, but if I was throwing money at an Omega to make it faster, I wouldn't start with throttle bodies.

Kevin

[Admin]

Getting to 300bhp from a normally aspirated 3.0 engine will require some serious work!!

Start, as Kevin says with the exhaust manifolds. These are the biggest constriction and will free up an impressive amount of power.
There is enough airflow on the intake side for now.

Oh, and if you find somewhere that can make new tubular exhausts (that fit!) at a sensible price, please let us know!  

[Kevin Wood]

There are certainly places that make up custom exhausts for the kit car market. A couple spring to mind:

Wunoff http://freespace.virgin.net/wunoff.cpe/

Custom Chrome http://www.custom-chrome.co.uk/

I can ask around for recommendations if you like. These guys will typically take the car for a week and build an exhaust to fit it. They are not prohibitively expensive for kit cars, but I would imagine the job is a bit more involved in the cluttered engine bay of an Omega.

Kevin

[megaomega123]

I thought this thread was about strangling policemen   Re: throttle bobies

[TheBoy]

yes for road driving but i would like about 300bhp eventaly for drag days and show some people that family cars can be just as quick

Sure I've read somewhere that the engine isn't strong enough for much beyond 250bhp without work...

[Kevin Wood]

MarkDTM was saying that cooling becomes a problem on the back cylinders and the cooling circuit needs to be modified by ditching the transfer pipe from the rear of the block and connecting it to a plate that replaces the oil cooler cover. A conventional oil cooler is then used.

That was the gist of it, anyway. Quite a bit of work.

Kevin

[nemesis_v6]

Give us 12 months to sort out a far bit of cash and i will let you now how i got on in mean time watch this
space will keep a eye out for a good fabbys for the mannys but im a long way from you guys

[Admin]

Well I will watch with interest, but you will require a LOT of money to make 300bhp from the 3.0

3.2 on the other hand has a much stronger crank it seems (always a good starting point!) so may be more suitable as a project.

[nemesis_v6]

if thats true about the crank can i swoop it  over to my 3.0lt

[Kevin Wood]

I think both the bore and stroke of the 3.2 are different from the 3l so swapping the cranks is probably not viable without a load of other headaches.

With any tuning job, it's probably better to start with the biggest standard engine to minimise the amount of work you've got to do - unless you have to have a certain engine capacity or unless the bigger engine has got so much stroke it's not going to rev well, or such thin cylinder walls that it's not going to be robust.

Well, let us know how you get on  

Kevin