Arch-Angel

I've just seen a Garrett T04b15

http://cgi.ebay.com.au/ws/eBay...tores

I've never heard this turbo before, and i'm having trouble finding info.
Can anyone tell me if this would be suitable for use on a H23a FI setup?
And does anyone know if it s a ball bearing turbo??

any help is appreciated!

Lucky_Smurf

How much power do you want to make? It's only a 47mm wheel. Pretty small really. The t04 is nice for flowing more exhaust up top but this thing isn't really gonna make a whole lot of power. It says 350 right there. If thats what you want then go for it.

Arch-Angel

ahh, i see. Thanks for the info, I'm still in the learning stage.
so what size wheel should i be looking at? i am eventually hoping to make around 350-400whp.
Do you know of any sites that might have info on what the difference in A/R and trims do? Cause I'd really like to learn...

Lucky_Smurf

Bottom line with A/R is the following. Larger number, .82 for example, will spool slower but make more top end power. Small numbers, .48, spool faster not as much top end. Here is something from Garretts site.

A/R
A/R describes a geometric property of all compressor and turbine housings. Increasing compressor A/R optimizes the performance for low boost applications. Changing turbine A/R has many effects. By going to a larger turbine A/R, the turbo comes up on boost at a higher engine speed, the flow capacity of the turbine is increased and less flow is wastegated, there is less engine backpressure, and engine volumetric efficiency is increased resulting in more overall power.

So you want to make 350-400 whp huh. I'd go with a t3/t4 57 trim .63 A/R that should net you somewhere around there depending on motor and have a pretty quick spool as well.

I'm always here to help a fellow Aussie out.

Arch-Angel

ok, thats good advice, but since I have your attention, how about a couple more questions?!?
What does a difference in 'trim' size make? And what is the difference between a t3/04E and a t3/04B????

Thanks for your help mate, its greatly appreciated!

Lucky_Smurf

Trim is typically the size of the wheel. Larger the number the bigger the wheel the more air your gonna flow. The following is some good info on trim

Trim
Trim is an area ratio used to describe both turbine and compressor wheels. Trim is calculated using the inducer and exducer diameters. As trim is increased, the wheel can support more air/gas flow. Use these formulas when calculating trim:

trim (compressor) = (inducer diameter)^2/(exducer diameter)^2 x 100

trim (turbine) = (exducer diameter)^2/(inducer diameter)^2 x 100

That help?

Oh the t04b vs t04e are sizes of the exhaust housing. Once again the higher in the alphabet the letter the larger the houseing. The also go up to t04r and t04s.