Turbine Housing A/R Ratios Explained!

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What is the "A/R" of the turbocharger hot side?
What does that mean & Why is it measured that way?
What type or size of A/R does a gasoline vehicle need?
Does it need to be larger to support the higher RPM exhaust flow?
Do Diesels need a smaller A/R for quickly spooling the turbo while towing?
Do Diesels need a larger A/R for high HP applications a racing?

If you have asked any of these questions, we are here to help clarify any confusion on the subject!

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Jason is like this was the wrong day to smoke on lunch 🤣

ChastonPierce

I just installed the gtp38r kc center cartridge with .84 on my superduty 7.3 zf6. Perfect combo.

floydgould

I greatly appreciate the info. Really good analogy it makes sense finally

apeykid

For a daily/street 0.6-1 AR is where you want it. Just make sure you have an electronic boost controller and external wastegate to prevent back pressure.

Malficion

Do you have a video describing the difference between twin scroll, and open?

LimaTangoZulu

I just went from a stock obs tp38 with a wicked wheel and a 1.0 housing to a kc turbo stage 1 63/70 .84. I already noticed more boost on the same tune and it comes on faster. I also noticed a very large egt drop with the stage 1. I can now pull a hill at about 1100° vs 1300°

whitefpowerstroke

Match the turbo for the engine max HP area . Max HP 450 @ 4, 800 get a turbo that have best flow around that RPM . Working together united state has great benefits

stephenhans

"we don't recommend 1.15, they're laggy and slow" 😅😅 and I'm here rocking a 1.22 on my Honda.. 🙈

Dankro

A/R ratio for an S15 / SR20DET with stock internals ?
Turbo just died and looking at upgrading to a G25 - 550 but dont know if i should replace the manifold for the 0.72 v band inlet or keep the existing manifold and get hte G25 550 with the T25 inlet and 0.49 A/R.

MrGrrraham

Switch blade design is best of both worlds.... Only if there was one for the 7.3

jasonmorris

looking to get a s363 but what should i purchase 68/.83 or 74/.91 ?

daytonangeladviento

Could u let me know what would be best for a FORD FALCON Barra Engine 2003 to 2014 not above 2016 there FG models and they are short barra engines... the earlier ones are Long barra engines.. which i have a 2004 model... i wanted to make around 500HP Just wanted to know what would be best for lots of power and very fast boost... which Turbo to choose i was leaning around a medium sized one... but there is a lack of info out there on whats good and not lol...

cop

hi im looking for advise i have a BMW e46 with the engine M52B28TU and im looking for a turbo ist will be my dayly car so the target is 350-400HP with 0.7-1.0 bar engine is stock and i know its good till 450hp in the future i may upgrade the engine to 500-600hp but now im asking for advice whitch turbo with what A/R is better 0.63 or 0.82 for 2.8 Liter i like to spool from 3000-3500 RPM im looking for a garett now thank you

moiseiboianov

FFD recommended i go with the 1.0 when i was setting up my 96 FSuperduty dump with 63/73 tiger and their 180/30's. Its pretty much still useless down low where i need it even with full fuel system and adrenaline setup. I knew i should have went tighter for what i was doing. Any suggestions?

BruceMyersLBZ

I have a vw touran 2006 1.9 diesel. The factory turbine spec makes the turbo to boost at low rpm from 1k rpm to 3k rpm and the 4k and 5k rpm doesn't feel like it's having a big boost. So I wanna switch to a turbo that covers the rpm from 1k to 5k.
Any suggestions?

BigBeastStep