Compressor Maps

[Roy]

Anyone have any idea what unit that is on the x-axis / airflow.

[EnricoPalazzo]

The X axis of the graph represents airflow in pounds per minute. As a general rule, each pound of air generated represents 10hp. This is flywheel hp and not wheel hp, so don't confuse the two. When looking at this be sure to account for driveline losses when you estimate your power output.

http://www.skylinesaustralia.com/forums/sh...compressor+maps

[DoughBoy]

That's not lbs/min - it's how many the sphincter of the universes will get sucked into the comp. inlet. You really need to high-flow that turbo so you can fit 1 whole the sphincter of the universe in it at full noise.

[Sydneykid]

Kg's per sec maybe?

That ends up at ~400 bhp, does that sound right for a TD06-20G?

[DoughBoy]

It's cubed meters/second. Converted to CFM:

Edit: uploaded gif.

[Sydneykid]

Mmmm, :confused: in order for the compressor map to be usefull it has to show the weight of air over time. Otherwise the atmospheric pressure (eg; at altitude) will effect the map. As air becomes less dense, it weighs less and this is directly proportional to the power able to be produced from that amount of air. It is not the volume of air, but its weight that is important. That's why the usual (US) compressor maps are in lbs per minute.

To make that map usefull you would have to convert the volume measurement into a calculated weight, say at sea level. That would work OK, as long as that is what they used in arriving at the map in the first place. :headspin:

[Roy]

Thanks EnricoPalazzo, but if you look at the axis the units aint lbs/min, if it were this would be the crappiest flowing turbo ever...

Cubed metres per second isnt a very common unit, is it....thanks for the cfm chart.

[Roy]

Oh one mroe thing Doughboy, have a guess, is my turbine is the TD06 or the larger TD06H? No that is should make much difference when looking at the compressor side of things.

...according to that compressor map the TD06-20G can reach 18psi by around 3500rpm, but doesnt like much more then 1.3 bar. Looking around on US sites running the Mitsubishi turbos on their 4G63 etc, they are using 7cm^2, sometimes 8cm^2 exhaust housing on their 2L cars with the TD06 turbine, perhaps the 10cm^2 i have i a little too big?

[DoughBoy]

Troy, you do realise that those maps are for MHI 20G's, if there is a difference between the Trust unit and the commercial MHI unit then the charts not worth much. Trust surprisingly don't publish comp maps either, so have no idea what the "real" map for your turbo looks like.

We've still got that 8cm TD06 here anyway, you know what it was like on an SR20. But after seeing the results on my white car capped due to a too small exhaust housing I'd say keep the big one, the frustration of hitting the same max power at 14lbs vs 23lbs is not worth it!

[Roy]

Pfc arrives tomorrow so i should know by weeks end how many the sphincter of the universes i got...

If its only a the sphincter of the universe breast , then well if i cant drive a 60s muscle car, i may just use a born in the USA turbo. :slap:

[DoughBoy]

Psst I got a Turbonetics T66 b/b here with HKS manifold to suit

[Sydneykid]

Psst I got a Turbonetics T66 b/b here with HKS manifold to suit

Ooooo! :headspin: RB26 or RB25 manifold? Hi/front or low/rear? $? :wassup:

[R33vit]

Psst I got a Turbonetics T66 b/b here with HKS manifold to suit

hehe chris

can I use it for 1 nite at WSID

[DoughBoy]

HKS RB26 stainless manifold, top mount. Have been wanting to see how the Turbonetics turbos stack up vs. Jap stuff, and the T66 has such an awesome comp map.

Prolly going straight up for sale though, trying to cut back on tuning costs (I can just start to sit down now after the 3040 setup) and would rather just throw the new twin kit in the new car straight off the bat.

Price... have to wait till next week to see how much the container gets hit by customs.