.68 or 1.0 a/r with my combo?? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 16 Old 06-13-2011, 04:55 PM Thread Starter
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.68 or 1.0 a/r with my combo??

Hey guys gunna purchase a on3 turbo here soon but still not sure which exhaust a/r to choose. .68 vs 1.0

stock block 347
rhs 215 heads
systemax intake
custom FTI cam

dont plan on spinnin past 5500 to keep power levels down. I want the .68 for faster spooling but will this choke up the engine @ around 5500? Trying to keep power under 500whp


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post #2 of 16 Old 06-13-2011, 07:15 PM
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.68 works well on 306, 1.0 will be good on 347, 3 1/2" down pipe, you should be full boost around 4k,

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post #3 of 16 Old 06-13-2011, 08:01 PM Thread Starter
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.68 works well on 306, 1.0 will be good on 347, 3 1/2" down pipe, you should be full boost around 4k,
my downpipe is only a 3" and I dont have plans to change it anytime soon.

4k seems like it will be turning on later than I want. I dont wanna spin past 5500 so that wont be much time in boost. Would the .68 be restricting only being spun to 5500??

Will be keeping boost in the 6psi range

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post #4 of 16 Old 06-13-2011, 08:23 PM
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They should offer a .81 or .96 ... not sure which is best for you but Im pretty sure its safe to say the .68 is too small and the 1.0 is on the big side..

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post #5 of 16 Old 06-13-2011, 08:29 PM Thread Starter
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the on3 70mm turbo's on ebay come in a .68 or 1.0

the 76mm come in a .68 or .89 i think

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post #6 of 16 Old 06-13-2011, 08:47 PM
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You will be fine with the .68 housing. I get full boost just over 3k. I have the basic H/C/I setup as well. Granted I spin mine to 6k and make over 500 but you will be just fine it wont choke the motor

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post #7 of 16 Old 06-13-2011, 09:59 PM
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post #8 of 16 Old 06-14-2011, 02:05 PM Thread Starter
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1.0
Would you mind telling me when you made full boost with your mpt70? You had the larger .96 didnt you?

thanks for all your advice/opinions

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post #9 of 16 Old 06-14-2011, 02:38 PM
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28XX, it always logged full boost before 2900rpm

This was on a 331, MPT70 .96

Glad to help man!

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post #10 of 16 Old 06-14-2011, 03:06 PM Thread Starter
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I called on3 to order the t70 with 1.0 a/r and they had 70mm with .86 so thats is what I went with! This was the last part i needed for my kit. I will be starting my build thread soon!


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post #11 of 16 Old 06-14-2011, 04:37 PM
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Good deal man, can't wait to see the thread!!!

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post #12 of 16 Old 06-14-2011, 04:49 PM Thread Starter
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Good deal man, can't wait to see the thread!!!

-Chris
Hopefully it comes out 1/2 as nice as yours!! haha

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post #13 of 16 Old 06-14-2011, 04:58 PM
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HAHA thanks man I appr the kudos!

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post #14 of 16 Old 06-14-2011, 10:37 PM
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Didnt notice you had a 347, I just saw the stock block lol. Yeah you need a bigger housing then a .68

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post #15 of 16 Old 06-15-2011, 11:46 AM Thread Starter
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Didnt notice you had a 347, I just saw the stock block lol. Yeah you need a bigger housing then a .68
thankfully they had the .86 turbo. I think that it will be juuuuuust right.

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post #16 of 16 Old 06-15-2011, 02:51 PM
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The nice thing is if you ever want to change the spool characteristics you can just swap the hotside on the turbo to a .96 or 1.00

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