Turbo differences

[Tsia]

Just a quick one really. I see people fitting GT3076/3071/etc turbos to their cars and just wondered about the differences. I'm not sure if they're a big, slow spooling turbo or a small, fast spooling etc? This isn't just about the two I named, but a few of the other 'common' turbos aswell.

[Peter Gidden]

Spend some time working through Garrett's TurboTech. It's very informative.

http://www.turbobygarrett.com/turbobyga ... tech_basic

Then look at Garrett's numbering system:

http://www.turbobygarrett.com/turbobyga ... menclature

[T.F.S.]

I thought my 3071 spools faster than stock...it seems to have more torque available at all rpm's than the stock turbo from what I have seen when looking at others dyno graphs.

[StevieL]

My GT2860RS spools silly fast! Not very top end powerful but great for quick acceleration and apparently good for about 360fwhp?

[jasongtr]

+1

my gt28rs (ko racing kit) spools very fast with the blitz boost controller gain set properly now - still bored of the mr2 already though

[Tsia]

Spend some time working through Garrett's TurboTech. It's very informative.

http://www.turbobygarrett.com/turbobyga ... tech_basic

Then look at Garrett's numbering system:

http://www.turbobygarrett.com/turbobyga ... menclature

I'll take a read, thanks!

Might I ask though, how a turbo can put out the same pressure, yet give more power than a stock turbo?

[Steve-O 2007]

More efficient, larger intake, faster spool up with different exhaust side setup, intake side setup, amount of fins, smoother running etc etc

Plus usually they run external wastegates which I find hold the boost alot more steady than internal... My CT26 would overboost from 0.95 bar up to 1.3+ bar reducing performance due hot air. Fitted a Greddy TD05 with Tial wastegate and I could hold boost solid at any level.

Thats what Im going with anyway

[Magic Beans]

The key difference is the amount of air they can shift at a given pressure, compared to a smaller turbo. The larger the turbo the higher the amount of air it can feed the engine. More air plus more fuel equals more power.

Plus there's better efficiency etc

[T.F.S.]

Might I ask though, how a turbo can put out the same pressure, yet give more power than a stock turbo?

Different amount of flow...same pressure.

[bobhatton]

Just a quick one really. I see people fitting GT3076/3071/etc turbos to their cars and just wondered about the differences. I'm not sure if they're a big, slow spooling turbo or a small, fast spooling etc? This isn't just about the two I named, but a few of the other 'common' turbos aswell.

Pressure, lets say 1 bar boost is only half of the information that is needed to tell you the total weigh of air being delivered to the engine. What is missing is the temperature of that air.
So just saying I run 1 bar of boost gives no information of how much power that will give because if the air is hot it will have less weigh and will make less power than a more efficient turbo that does not heat the air so much.

You need to look and the compressor maps to find the most efficient comp wheel to work with your engine design

[kingsley]

Sorry for resurrecting an old thread but it seemed better than starting a near duplicate.

Those of you with GT2860 turbos, how early do they actually spool compared to a stock rev 3's turbo?

My rev 3 with stock turbo gives me positive boost from just over 1000rpm and ramps up nice and smoothly and by 3000rpm I'm getting about 1 bar. I love the progressive way it spools, makes it very useable on the road.

I'm also wondering whether the GTX2863R would be a good option.

Ideally I'd like something that spools exactly like the stock turbo but has a bit more max power potential. I don't really want something that spools much earlier, but I wouldn't want it to spool much later either, as I find the stock turbo's spool just right. Surely that must be possible with a modern ball bearing turbo.

I may have to change my turbo soon so it would be good to know the options.

Cheers,
Kingsley.