throttle body question

[grum-glanza]

This one is more for lads running over 300bhp what size aftermarket throttle body should you use or is it just the bigger the better?

[maddox710]

Not necessarily the standard inlet mani and throttle body is good for 300bhp

[grum-glanza]

ya but im kinda looking for 400bhp

[RobSR]

^ Whats your current spec?

[AdamB]

65mm

Edited February 23, 2014 by AdamB

[grum-glanza]

adamb that's perfect I was planning on using a 70mm one

[RobSR]

What have you already done tho? Inlet mani/tb is one of the last thing that needs to be changed on a starlet. Have you done everything else thats going to give you better gains first?

[mattyD]

In running a 65mm one

[Jamie_VF22]

Im running a 70mm one

Edited February 23, 2014 by Jamie_VF22

[AdamB]

adamb that's perfect I was planning on using a 70mm one

The larger you go the less bottom end power you get due to gas velocity, but obviously you have to make a compromise if your going for power. 70mm is good for 500bhp so you can sacrifice a bit of diameter if need be.

[grum-glanza]

Rob sr:

The car is running a fully forged 5e with a gtx 2863r turbo and a full standalone megasquirt ecu and I have a wepr intake manifold

Edited February 25, 2014 by grum-glanza

[RobSR]

Ah cool, not a lousy spec then. Any headwork atal?

[grum-glanza]

not really as far as I know there is a three angle cut on the valves does headwork make much of a difference?

[AdamB]

not really as far as I know there is a three angle cut on the valves does headwork make much of a difference?

Depends what headwork your after and how deep your pockets are lol. Most of the time pissing about with the cylinder head makes it worse than what the stock item was.

[RobSR]

The head is where all the power is made. But like adam said, if its not done properly you can make things worse.