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Old 04-18-2013, 12:38 AM   #1
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Opinion & Help!!

My homie has a 91 gt fox..he just rebuild the bottom end with forged internals,heads,intake,radiator..he wants to turbo it.but he doesnt know if he should do single or twin..he wants from around 500hp minimum to 700hp..cuz i thought he can but a single set up and a big turbo and run it maybe around 25-30 psi maybe..depending what he wants but i asked a performance mechanic and he started talking about balancing the engine with the power..something like that.so i just want to get a lil more info and opinions on this..thanks..ill appreciate it..
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Old 04-18-2013, 05:36 PM   #2
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Stock block should never push over 500hp and that with a main girdle reinforcement.
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Old 04-18-2013, 05:42 PM   #3
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+1 with a stock block 500 flywheel horsepower is pushing it , if anything a 6-8psi supercharger with a tune tune!!

Or DSS has aluminum blocks for $2,000-$3,000
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Old 04-23-2013, 02:28 PM   #4
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He just rebuild his bottom end..his block is ready for and power adder but doesnt know if he should go with one big turbo or two small turbos...
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Old 04-23-2013, 02:31 PM   #5
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Well on a stock block I would go low psi 6-8 supercharger with a safe tune
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Old 04-23-2013, 02:39 PM   #6
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Quote:
Originally Posted by WhiteCobra94 View Post
Well on a stock block I would go low psi 6-8 supercharger with a safe tune
Ohhhh the block..ok my bad.. so it would be safe for him to change the main block to be on the safe side.
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Old 04-23-2013, 02:43 PM   #7
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Originally Posted by 89 Foxloco View Post

Ohhhh the block..ok my bad.. so it would be safe for him to change the main block to be on the safe side.
Yes DSS , dart, boss they all have good aluminum blocks for 750+ HP and up
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Old 04-23-2013, 11:01 PM   #8
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DART is the only block he should go with. And he just wasted however many $thousands he put into the motor putting a forged rotating assembly into a block that can't handle anymore power than the stock rotating assembly could.

He is limited to 450-500 rwhp max.

25-30 psi will grenade that motor into a million pieces on the very first hard pull he does. Honestly, and I'm not trying to be harsh, your friend needs to do some research and learn a thing or two before he goes any further. Block capability, fuel systems, how a properly selected single turbo is just as good on a 5.0 or better than twins, other supporting mods to make a 500hp car streetable and safe etc...
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Old 04-25-2013, 12:41 AM   #9
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DART is the only block he should go with. And he just wasted however many $thousands he put into the motor putting a forged rotating assembly into a block that can't handle anymore power than the stock rotating assembly could.

He is limited to 450-500 rwhp max.

25-30 psi will grenade that motor into a million pieces on the very first hard pull he does. Honestly, and I'm not trying to be harsh, your friend needs to do some research and learn a thing or two before he goes any further. Block capability, fuel systems, how a properly selected single turbo is just as good on a 5.0 or better than twins, other supporting mods to make a 500hp car streetable and safe etc...
Thank you..i appreciate that info..ill have a talk with him about it..i dont think he would mind spending 3k on his project..thats new to me too..am not going to lie,i thought that just by building the bottom end u could make more than 500.. i remember people saying limit of 500 was for stock internals.but ill read more on that..thanks..
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Old 04-25-2013, 08:36 AM   #10
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The stock internals on a 5.0 are stronger than the block, the 4.6L is the one where you can just replace the internals and go.
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