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[rose5691]

Advice needed. On a Zetec silver top 2L with twin 40s I'm getting about155hp. If I swapped for 45s any idea what the increase may be on average?

Thanks,

John

[Bob Green]

40's are good for 150bhp and anything over that, 45's are the way to go.  However, given your engine output, I doubt if you will see much difference, if any to be honest.

A lot of money for very little me thinks.

Given you are not too sure of your engine output, have you been on a RR to have the 40's set up correctly?  Thats what I would do.

[rose5691]

Yes at NMS and it's 154.2. Bad case of upgradeitus and not sure where to start...cams, but then I'll nee new ignition etc...

Thoughts and sugestions welcomed,

John.

[Bob Green]

If you are to upgrade, bear in mind that it's not just a case of "bunging" things on.  It's about blending cams, cam timing, ignition mapping et al together to realise each individual components potential.

[rose5691]

When can you start  

[Bob Green]

After I have been out in my car to see if it works after fitting a crankshaft front oil seal.

 

[rose5691]

Is that a flippin' XE turbo? Let me know how it goes.

John.

[Bob Green]

No, it's a proper engine.

[rose5691]

Oh, thick me. What a monster, how many horses? Must cost a fortune in hay.  

[Bob Green]

Standard 224.

It's not hay that cost me a fortune, it's toilet paper!    

[rose5691]

alternative fuel-although you'd need to attach a magimix onto the fuel filler but should be ok      

[Blatman]

It's a proper engine with a hairdryer on the side of it...

QUOTE

Advice needed. On a Zetec silver top 2L with twin 40s I'm getting about155hp. If I swapped for 45s any idea what the increase may be on average?

The key here is choke size. You only *need* to go from 40's to 45's if you need a set of chokes that won't otherwise fit in a 40. Externally, 40's and 45's are the same dimensions and most of the parts are interchangable. But if your car produces it's best with, say, 36mm chokes, then it matters not whether the chokes are encased in a 40 or a 45. If the car *needs* 38mm chokes though, then you'll *need* a set of 45's 'cos 38mm chokes are too big for a 40...

[Bob Green]

There's a thought.    

[rose5691]

All that said, where would you start then? Cams, head mod, just give me more power-pleaaase!!    

[Bob Green]

All that said, where would you start then? Cams, head mod, just give me more power-pleaaase!!    

I would start with Cams, head mods and 3D ignition together to get the best from upgrades.

Looking at your avatar, you enjoy the track.  Is your car set up correctly in terms of steering geometery and suspension.  A sharp handling car is as good as more power.