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smallest turbo on a 408

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Old 09-03-2008, 08:29 PM
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Originally Posted by DrTurbo
Backpressure through the roof and head lifting. All a part of running a small charger on a big engine. If you are shooting for big #'s, you will have nothing but headaches.
i gaurantee u the backpressure u would see running that small of a turbo would be no where near the pressures the motor would see on the power stroke.there are many production motor running way to small of turbos with no problems. a single t-70 is more than enough for the street with good lowend spool.
Old 09-04-2008, 05:47 PM
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Originally Posted by 67Firebird455
Shoot, what about a GT45 turbo? How much bigger (physically) is a GT45 vs a T70?
GT45 is a mid-frame unit. Much larger then a T70. Big package, but not much power....if your refering to the MP based unit.
Old 09-04-2008, 05:50 PM
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Originally Posted by topend
i gaurantee u the backpressure u would see running that small of a turbo would be no where near the pressures the motor would see on the power stroke.there are many production motor running way to small of turbos with no problems. a single t-70 is more than enough for the street with good lowend spool.
eh?? Obvious you have not put a pressure gauge on a manifold and see what a 408 through a small P-trim turbine wheel will do. Boost pressure will come in quick and drop even quicker after the comp wheel chokes. Nothing new here....some guys on this board have tried it. None of them are running T70/p-trims anymore on big cube motors.
Old 09-04-2008, 07:38 PM
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Originally Posted by JZ 97 SS 1500
eh?? Obvious you have not put a pressure gauge on a manifold and see what a 408 through a small P-trim turbine wheel will do. Boost pressure will come in quick and drop even quicker after the comp wheel chokes. Nothing new here....some guys on this board have tried it. None of them are running T70/p-trims anymore on big cube motors.
again backpressure will be no where near combustion pressures. ..Combustion pressure is what causes heads to lift not exhaust back pressure. a t-70 will work on a 408 , have very good lowend boost and make 700-800 hp at the flywheel.will it choke the motor at some point sure ,all turbos do at some point. if u install a turbo u are going to have back pressure its just part of deal.
Old 09-04-2008, 09:20 PM
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Originally Posted by topend
again backpressure will be no where near combustion pressures. ..Combustion pressure is what causes heads to lift not exhaust back pressure. a t-70 will work on a 408 , have very good lowend boost and make 700-800 hp at the flywheel.will it choke the motor at some point sure ,all turbos do at some point. if u install a turbo u are going to have back pressure its just part of deal.
Correct me if I'm wrong, but I DO believe too high of ex back pressure can cause heads to lift.
Old 09-08-2008, 11:29 AM
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Originally Posted by ninetres
Correct me if I'm wrong, but I DO believe too high of ex back pressure can cause heads to lift.
Yes they can....not sure this person has been around turbo setups plagued by excessive pressure problems.
Old 09-08-2008, 12:30 PM
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A friend has a 408ci + GT47-88, he's made 920rwhp on a load dyno with race gas.



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