I plan to turbo my b18a after i rebuild it. now people are telling me i need new valves, valvesprings.Because i will be revving higher. but i don’t want to increase the stock redline.Is it possible to build up a turbo engine without increasing the stock redline and still hit 300 whp?
or is it nescesary to upgrade the valvetrain when installing new camshafts?
Well you have to think about it logically…
What is the purpose of installing new cams? To get more power and a better power-band, right? How does a cam make more power? By opening your valves more. By running a bigger cam than stock, you will be putting extra stress on your valve springs and will probably run into coil-binding because of that extra stress… you’ll push the springs past their limit.
Which is why you should upgrade to a spring that matches your camshaft. Valves aren’t a total necessity, but valves that weigh less will ‘free’ up some power simply because there is less mass to move.
IMO you’d be a fool to upgrade to a camshaft that has a higher lift, or longer duration, and not upgrade to a spring that would accommodate such lift/duration properties.
i did 300whp on a stock ls turbo. whoever told you that you have to rev high to make power doesn’t know what he’s talking about.
True that… You can make that power on a stock motor. But if you’re in there upgrading stuff, then its wise not to skimp on stuff.
how many kms on your engine when you turbo’d it???
Any healthy B18a/b will make those numbers (on a good tune and decent turbo/manifolds)… Just check your compression and leakdown numbers to be sure of what condition its in.
Hell, I’ve seen stock-block/head B16s locally that are knocking over 400whp on a real good turbo setup.
:iagree:
149 000km. compression test = 185psi in all 4 cylinders.
300whp 292lbs-ft at 18psi with a GT2871R.