NA or Turbo

[Brian.]

240sxguy said:

Sounds like fancy talk for slow.

This.

Also, if you do decide to turbo it, don't do twin turbo, that's way to much work for no gain. Just do an single.

[Jeff]

Brian said:

This.

Also, if you do decide to turbo it, don't do twin turbo, that's way to much work for no gain. Just do an single.

There is gains for that extra work.

[Earl]

Twin turbo is not a good idea. However, a compound turbo setup has many gains and advantages=)

[Brian.]

Twin turboing a BMW M20 or even a 2jz, is kinda pointless, unless you go compound. But for a reliable dailyable car, I would not go twin. Just single it and call it a day.

[Jeff]

A compund turbo set up is using 2 turbos

[Earl]

Jeff said:

A compund turbo set up is using 2 turbos

But they are used in sequence. It isn't a twin turbo setup.

A twin turbo setup on a 2jz for example would have three exhaust ports feeding one turbo, and then three feeding another.

On a compound turbo setup, they're used in sequence. You use a smaller turbo that spools fast to feed the large turbo to eliminate boost lag as much as possible=D

[Brian.]

but with an M20, there really isn't any turbo lag, unless you go with a HX40+ or the likes.

[Jeff]

Earl said:

But they are used in sequence. It isn't a twin turbo setup.

A twin turbo setup on a 2jz for example would have three exhaust ports feeding one turbo, and then three feeding another.

On a compound turbo setup, they're used in sequence. You use a smaller turbo that spools fast to feed the large turbo to eliminate boost lag as much as possible=D

Very good point my sir

[The Full Banana]

one of each is ideal, IMO.

[tsweers89]

Brian said:

but with an M20, there really isn't any turbo lag, unless you go with a HX40+ or the likes.

Just because you have a hx35 does not mean your not going to have lag. It depends on your tune and also the exhaust housing. If he had something like a 1.07 or even a .94 I bet there would be lag and wouldn't see boost till around 3.2k. Also looking at the compressor map for that it isnt in the efficiency range until around 19-22psi which would mean he probably need a built lower end. Also hx35 is a was outdated turbo technology wise. A t3 garret or borg warner would be leaps and bounds better especially for what he plans on using the vehicle for.