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2nd hand Turbo's
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2nd hand Turbo's
Ok so i want a little more out of the old 2F and was thinking of bolting on a turbo. I have a mate who can set it all up cheap, but what turbo should i look for and what sort of price (looking to do it cheap) ?
----HillBilly Engineering----
Bazzle's right - nothing's cheap. Also remember that you never get something for nothing.
Like everything else in life, turbocharging involves a compromise. Unless you spend huge dollars on fancy turbine housings with variable nozzles you need to decide if you want top end power or stump pulling torque. You can't have both.
For a 4B with an offroad emphasis (that sound like you?
), I'd be going smaller housing rather than larger, and optimise everything for early boost (= lower revs.) This means you won't get as much at the top end as you could with a larger housing (which would flow more, but produce more lag.)
Stick with standard compression ratio, low boost (sub 10psi) and preferably blow-thru.
If you have an aftermarket camshaft designed for a naturally aspirated engine you may find reverting to a stock cam will give getter results (because turbos don't work well with large overlap.) Better still would be a replacement cam ground for a turbo.
A front mounted intercooler adds volume to be pressurised, which adds to lag. A water/methanol injection system would probably be better for your application, if you feel so inclined. They're not absolutely necessary.
Price wise, you might get away with $1500, I expect $2k should see a decent system.
Have fun!
Scott
Like everything else in life, turbocharging involves a compromise. Unless you spend huge dollars on fancy turbine housings with variable nozzles you need to decide if you want top end power or stump pulling torque. You can't have both.
For a 4B with an offroad emphasis (that sound like you?
), I'd be going smaller housing rather than larger, and optimise everything for early boost (= lower revs.) This means you won't get as much at the top end as you could with a larger housing (which would flow more, but produce more lag.)
Stick with standard compression ratio, low boost (sub 10psi) and preferably blow-thru.
If you have an aftermarket camshaft designed for a naturally aspirated engine you may find reverting to a stock cam will give getter results (because turbos don't work well with large overlap.) Better still would be a replacement cam ground for a turbo.
A front mounted intercooler adds volume to be pressurised, which adds to lag. A water/methanol injection system would probably be better for your application, if you feel so inclined. They're not absolutely necessary.
Price wise, you might get away with $1500, I expect $2k should see a decent system.
Have fun!
Scott
NJ SWB wrote:Bazzle's right - nothing's cheap. Also remember that you never get something for nothing.
Like everything else in life, turbocharging involves a compromise. Unless you spend huge dollars on fancy turbine housings with variable nozzles you need to decide if you want top end power or stump pulling torque[/color\]. You can't have both.
[color=red]For a 4B with an offroad emphasis (that sound like you?
Have fun!
Scott
Yep that sounds like me
Im not planning on running big boost and want it coming in just above idle.
Also wondering weather one could be pulled off an old 60's TD and adapted to suit and would it be major work.
----HillBilly Engineering----
Find a CT26 turbo from a Celica GT-4 and bolt it on. Preferably one with a steel exhaust wheel, as the ceramic ones have a tendancy of hopping off the shaft at the most inconvenient moment New steel ex. wheel and shaft is about $250 at cost, if the compressor wheel is buggered then thats another $150 at cost. Put new bearing and seal kit in it, balance it up and you will be away. No idea what the actual 2nd hand turbos cost over in Oz though?
By replacing the internals like that, you can be more confident that its going to last.
If you're trying to do this on a budget, your biggest problem will be trying to find a 2nd hand exhaust manifold....perhaps you can get someone to make one up?
Hope that helps.
Cheers
Mitch
New steel ex. wheel and shaft is about $250 at cost, if the compressor wheel is buggered then thats another $150 at cost. Put new bearing and seal kit in it, balance it up and you will be away. No idea what the actual 2nd hand turbos cost over in Oz though?
By replacing the internals like that, you can be more confident that its going to last.
If you're trying to do this on a budget, your biggest problem will be trying to find a 2nd hand exhaust manifold....perhaps you can get someone to make one up?
Hope that helps.
Cheers
Mitch
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