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How long should I let the turbo cool after driving the car? I try and take it easy the last mile or so of my drive, and I let the car idle for about a minute before I shut it down. I don't want to cook the bearings. I've heard of problems w/ aftermarket alarms and turbo timers.
After running it hard 2 min cool down.

If you drive down the road not hard, don't worry about it too much.

If you are that concerned about it get a temp gauge and put it in the turbo mani.
 

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After running it hard 2 min cool down.

If you drive down the road not hard, don't worry about it too much.

If you are that concerned about it get a temp gauge and put it in the turbo mani.
My friend had a 89 Ford Probe Turbo, and he ran the hell out of it and never let it cool down...and guess what happened? turbo blew...dont know if it was the turbo or being a probe haha
 

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u'll have to forgive me as I am still a rookie in the turbo world but what does it mean that a turbo can be both oil and water cooled as in the Garrett T3's (.60 comp, .53 turbine found on the 85-89 300zxtt ? Does it mean that the turbo can be either water OR oil cooled? Or, does it mean that it has to be both oil and water?
 

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u'll have to forgive me as I am still a rookie in the turbo world but what does it mean that a turbo can be both oil and water cooled as in the Garrett T3's (.60 comp, .53 turbine found on the 85-89 300zxtt ? Does it mean that the turbo can be either water OR oil cooled? Or, does it mean that it has to be both oil and water?
It is water and oil cooled. It will have ainlet and outlet for both water and oil. You MUST use the oil feed/and return. You do not HAVE to use the water side but it is suggested.
 

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Question here...anyone know how to calculate the flowrate of air that you motor should theoretically need for XXX amount of power? I'm asking to be able to select the proper turbo with a compressor map.

thanks!


The bottom line: There’s no longer any reason to consider turbo sizing black magic. With a few compressor maps, a pencil and a calculator, there’s just no excuse for hooking up that oversized, boost-lagging, beast of a turbo and feeling good about it. Despite what they say, size does matter.

How to plot points on a compressor map:

Calculate airflow for the X axis: measured in lb/min, airflow = (HP target) x (air/fuel ratio) x (BSFC/60) where BSFC is lbs fuel / (hp x hr) If you don’t have access to BSFC data, you can plug in an estimated value between .50-.60.

Calculate volumetric efficiency = (actual CFM / theoretical CFM) x 100 where theoretical CFM = (RPM x CID) / 3456 and actual CFM = 90%, a good average number if you don’t have access to measuring this. Multiply by .0610237 to convert cubic centimeter displacement into cubic inches.

Calculate manifold absolute pressure: map = [(airflow) x (639.6) x (460 + intake temperature)] / (VE) x (RPM/2) x (CID) Upwards of 100 degrees F is a good estimate for intercooled intake temps if you don’t have access to measuring this. Plan on adding about 1psi to take into account pressure drops related to the intake and/or intercooler.

Calculate pressure ratio for the Y axis = (14.7 + map) / 14.7 If you’re at sea level, 14.7psi will work. As elevation varies, this figure will need to be adjusted.

Note: Don’t worry about the constants like 3456, 60 or 639.6, they’re simply there to tidy things up and convert units.

VE = volumetric efficiency
BSFC = brake specific fuel consumption
HP = projected flywheel horsepower
CFM = cubic feet per minute
CID = cubic inch displacement

Other useful calculations:

Trim = (minor/major)squared x 100

Trim describes the relationship the minor diameter and major diameter of a compressor or turbine wheel shares with each another. The inducer, or minor end when referring to compressor wheels, is where the air enters. Air exits through the exducer portion.


This is a part of it ,you need to reed the book maximum boost by corky bell.OR get the book forced induction by A.graham Bell. ;)
 

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which is the best turbo for d15b vtec ? any suggest maybe..
just with stock internal engine part

T3, T3/T4 , TD05H, or maybe any nissan turbo like 16v
ball bearing is priority
 

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Whats the life of a turbo? Routine maintenance? Oil problems? Un-avoidable shaft-play or can you avoid it?
depends on the size boost and brand of turbo

chinese turbos on a soft boost id u get lucky with a good one 2yrs or so. im going on 1

there are garrets off 200k mile volvos that are still fine with no shaftplay etc.

depends on how hard u r pushing the snail really if u are pushing it past its limits it will not last long, use it in its specified range and u will have better luck
 

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I had an idea for an addition to this sticky I have been curious and didnt see anything in here already. How about the different types of exhaust manifolds and there pros and cons and affects on boosting? ie. log, hf, top mount, cast, tubular, etc.
 
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