I think the turbo is good for that but I'm going to have a 650 tune until I get used to it and until I replace the diff. Then I plan on 750 - 800. I'm not sure how over shooting the turbo is a failure? I don't want to buy one good for 750 then max it on my next tune when I want to up the boost.

 

I'm still not understanding how I will blow the thicker head gasket and not the original. I have head studs also but not the block. I was under the impression by lowering the static compression that you wouldn't blow the head gasket. So what you are saying is the stock head gasket is stronger than the inline 3mm?

 

It is not a matter of which is stronger. The 3mm will blow because the compression/ combustion it taking place in the head gasket rather than the much stronger block sleeve. Since the combustion is happening inside the gasket, it is MUCH easier to blow. Plus the internals are plenty strong from the factory to support 500+ hp. If you are planning to eventually go to 750-900 hp you will need to build the engine. I have heard of people making 700 on stock internals, but I'm not sure how long that'll last.

 

What are your plans for the car? Is this going to be strictly a drag srip car? Anything over 600 and you are going to blow the differential doing in gear pulls. To be able to support that much power you will need the v160 supra transmission and Ford 8.8 differential swap. Which runs about $10,000 for both.

 

You will not be in the larger turbos efficiency range. Meaning a 35r making 650 and your 67mm turbo or whatever making 650 will not be the same. Yes you would make the power with less heat on less psi but that 35r would blow your doors off being as its in the range its supposed to be. Dont get caught up in the numbers like I did when I first started. Build a car for a certain event you want to be apart of and stick to that. If you are not getting the results you want change the turbo for a larger one or smaller then.

 

You will not be in the larger turbos efficiency range. Meaning a 35r making 650 and your 67mm turbo or whatever making 650 will not be the same. Yes you would make the power with less heat on less psi but that 35r would blow your doors off being as its in the range its supposed to be. Dont get caught up in the numbers like I did when I first started. Build a car for a certain event you want to be apart of and stick to that. If you are not getting the results you want change the turbo for a larger one or smaller then.
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Alrighty this all makes a lot of sense. I never really thought about the head gasket being so thick as for combustion to "take place" at the gasket level. But now that you think about it... duh dumbass.

I know about efficiency ratings but I didn't think it would make that much of a difference if you under shot by 200 - 250 hp but if you think it does I would take your word for it, I'm no expert.

Alrighty so most likely change of plans since I am not dying to switch to the supra trans. Maybe do a 400 - 450 daily drive and have a 550 drag tune on a switch? That way I won't blow the diff just pulling and I still won't launch it hard.

So I guess in conclusion, remove the head gasket, go back to original. Stay under 550 HP and save my car from killing me or itself. And use the proper sized turbo. Thanks for the input made a lot more sense then me thinking about it myself (which I was obviously going in the wrong direction).

 

You will not be in the larger turbos efficiency range. Meaning a 35r making 650 and your 67mm turbo or whatever making 650 will not be the same. Yes you would make the power with less heat on less psi but that 35r would blow your doors off being as its in the range its supposed to be. Dont get caught up in the numbers like I did when I first started. Build a car for a certain event you want to be apart of and stick to that. If you are not getting the results you want change the turbo for a larger one or smaller then.
[/quote]

Alrighty this all makes a lot of sense. I never really thought about the head gasket being so thick as for combustion to "take place" at the gasket level. But now that you think about it... duh dumbass.

I know about efficiency ratings but I didn't think it would make that much of a difference if you under shot by 200 - 250 hp but if you think it does I would take your word for it, I'm no expert.

Alrighty so most likely change of plans since I am not dying to switch to the supra trans. Maybe do a 400 - 450 daily drive and have a 550 drag tune on a switch? That way I won't blow the diff just pulling and I still won't launch it hard.

So I guess in conclusion, remove the head gasket, go back to original. Stay under 550 HP and save my car from killing me or itself. And use the proper sized turbo. Thanks for the input made a lot more sense then me thinking about it myself (which I was obviously going in the wrong direction).
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Glad we could help! We all have to experiment and learn. My first turbo setup was a GReddy kit, I ran it for 5 months, sold it and went with a real turbo setup.