i want to get a turbo kit for my jdm b20a but from what ive been told the motor shouldnt be takin over 7000 rpms and that turbos dont kick in till like 4000 rpms is there any way to get allitle more boost at lower rpms???

 

you sure you have a b20a? not a b20b/z? the first is a completely different engine and is not compatible with any of the other b series engines.

anyway, whoever's telling you turbo's dont kick in till 4000 rpms is full of shit. a smaller turbo can spool very quickly, but start to max out sooner. at the same time a larger turbo will take a while to spool but makes more power at higher rpms. that's why it's important to pick the right turbo size depending on your ultimate goals for the car.

a stock internal b20b/z should not be revved over 7k rpm, mostly because it doesnt make power any higher. secondly because prolonged use at those rpms will lead to failure.

 

ya its a jdm b20a for a 90 prelude i put h23 forged rods and b16 pistons with wrist pin size bore to the right size and ported and polished head and was thinking about a t28 turbo

 

There's not much aftermarket support for that engine sorry to say. So a majority of parts are Going to have to Be custom. You can try to piece together your own kit.

A t28 is a smaller Turbo. But depending On the trim and model you can get good numbers from it.

 

i found a custom turbo manifold for my b20a and the t28 turbo kit is about $700 hopefully ill be able to afford it soon

 

700 for a turbo kit, sounds a bit too cheap.

what are u going to do for fuel management? if you say "im going to use a rising rate fuel pressure regulator" then stop and dont even bother with the turbo setup. sorry to burst your bubble, but its not going to run reliably.

i dont think hondata or anyone even made any options for the older prelude motors, so you're going to find that option before you even commit to going the turbo route.

i always tell people to get their bigger injectors and engine management setup before the turbo goes in because you can tune the idle and fuel trims for the bigger injectors for the non-boost portions of the fuel trim scales.