All the numbers...what exactly do they mean?

[Maadmike]

All these HKS 2835, T28, T88 turbos, and all the coding like : T88-34D.

Im just wondering exactly what they mean, i know that they indicate the size of the turbo, and usually the turbo housing?

But with say, a T28 is that the size of the area of the compressor housing, exhaust housing, size of the compressor wheel...u get the idea :)

Anyone who can help? cheers in advance

[GTSBoy]

Garrett make the series of turbos that go T2, T25, T28, T3, T4. The t25 and T28 are sort of halway sizes between the T2 and T3. Each increase in number is a corresponding increase in the frame size of the turbo, which is the core. If you have the core of a T2 and teh core of a T4 in each hand you will be quite out of balance coz the T4 is a lot bigger.

Hanging off the core at each end are the wheels (mounted to the shaft that goes through the bearings in the core) and the housings. It is possible to put various sized rotors and housings onto any particular sized core.

Other manufacturers have similar sequenced model number describing the basic size of the turbo. If the one sized core can carry a variety of different wheels and housings then they need some additional numbers to allow people to pick between them.

Hence another manufacturer's T88 will have some variants like the 34D that you mentioned or it might be a 34K (to make one up) that is the same size (ie about same power or airflow rating) but has wheels in it better suited to running higher boost.
It is all very complicated because no-one follows the same system, and some manufacturer's don't use a consisitent system with their own turbos anyway.

cheers

[Maadmike]

Cheers, thought it would have been something alobng those lines, was thinking it may have been thr housing sizes etc..thanx again.