Switching from S480 to Twin 76/68s - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 07-04-2016, 05:38 PM Thread Starter
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Switching from S480 to Twin 76/68s

Does anybody have any feed back good or bad about switching from a single s480 to running twin 76/68 with .81 housings, i am currently running 19# of boost but it takes a while to spool with a 96mm exhaust wheel, this is my streetcar running a 8.2 based motor with 11 to 1 compression and solid roller cam, AFR 205s and a blow through carb. car runs great right now but just looking to come out of the hole a little better. car weighs 3650 with me in it if that matters, trans is AOD-E with 4200 stall.

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post #2 of 7 Old 07-04-2016, 06:08 PM
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I would try a single precision 76/75 single this should make of power and easy to spool imo.

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post #3 of 7 Old 07-04-2016, 06:27 PM Thread Starter
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Been there done that, was way to small, even with the billet wheel. but thanks for the input.
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post #4 of 7 Old 07-04-2016, 06:43 PM
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Been there done that, was way to small, even with the billet wheel. but thanks for the input.
I have twin 76-75 mm turbos on my 363 ci turbo 400 and it made over 1300 whp with 19.5 lbs.
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post #5 of 7 Old 07-04-2016, 07:11 PM Thread Starter
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I have twin 76-75 mm turbos on my 363 ci turbo 400 and it made over 1300 whp with 19.5 lbs.
How quickly do they spool/ I am running a 363 also so was thinking a 68mm exhaust wheel would work great. my 76/75 would start building boost at 2200 rpm and had full boost on the convertor even using foot brake.
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post #6 of 7 Old 07-04-2016, 08:12 PM
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They spool up very quick. I just have to change the valvebody in my tranny. My gear set is to low to get a good hit. I'm not positive on my ar I will check and let you know they are pecision billet wheels. I will let you know for sure.
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post #7 of 7 Old 07-07-2016, 02:49 PM
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I'm going from a single 76 mm to twin 66 mm on my 331 over winter. I would think as long as your exhaust housings are sized correctly, you would spool way quicker, plus have crazy power potential.

.81 for a 363 probably...I'm running .68 on my 331, but I'm shifting at 6500 with a hydraulic cam.

93 Notch 347 twin 66s TH400...8.54 @ 162 Radials

91 Notch 410W Novi 2000 5 speed...10.99 @ 136
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