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I don't know the ins and outs of of turbo selection (only read a lot of the Graham Bell stuff), but the graph/map you see could really be called the "choose your best compromise" - increase each factor (bigger turbo for higher revving engine) and you will have some downsides (bigger turbo results in more lag).

There's much more to it of course but that's what people going for the "ultimate" all the time forget, the boring sounding "best compromise" is normally faster 99% of the time while the "ultimate" is faster 1% of the time.

Same goes for brakes, fit 380mm rotors and 8-pots to a Rover Mini and you WILL win pub top-trumps with your mates....but try and built a competitive car round it!!!!!

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well said, some people forget about the big picture sometimes when sellecting parts and building cars. I mean i've built some nice 600bhp mr2's in the past, very fast but you get them on the road and its just spinning up all the time and a well built 350bhp will leave it for dead.

Tim

TB Developments

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well said, some people forget about the big picture sometimes when sellecting parts and building cars. I mean i've built some nice 600bhp mr2's in the past, very fast but you get them on the road and its just spinning up all the time and a well built 350bhp will leave it for dead.

Tim

TB Developments

Reminds me of the Cossie YB-T lads, found that up to a fairly fixed power limit the car got faster round a track (up to about about 380bhp from memory) but beyond that it just gets more and more undrivable (peaky) and the lap time gains were minimal...esp given the drop in reliability as the engines became more highly strung.

As ever there are always exeptions, but there was a lot of talk about it a few years ago.

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yeah we found the same with the 3sgte in the mr2. 500bhp is about the absolute limit on the road, 400bhp makes a nice going road car and i can built that prietty reliably.

Drag racing is another story though, were at 955bhp with that, can't drive that on the road at all, spins in 5th frm just flooring the accelorator at 100mph lol, but drag its capable of 9's

sorry for going off topic but i take it you had some cossie background, thats where i cut my teeth building engines :rolleyes: built my first one at 14 ;)

Tim

TB Developments

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yeah we found the same with the 3sgte in the mr2. 500bhp is about the absolute limit on the road, 400bhp makes a nice going road car and i can built that prietty reliably.

Drag racing is another story though, were at 955bhp with that, can't drive that on the road at all, spins in 5th frm just flooring the accelorator at 100mph lol, but drag its capable of 9's

sorry for going off topic but i take it you had some cossie background, thats where i cut my teeth building engines ;) built my first one at 14 :D

Tim

TB Developments

Not personally, they just got talked about a lot as I've got a Mk1 Escort "project". While we're off topic my mate has a 240bhp n/a YB in his Mk1 on Jenveys, but he's selling the engine to make was for a 2.4 YB headed 300bhp beastie, Holbay/Warrior (or "Diamond-something") alloy block. :rolleyes:

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