MPT 66mm or 70mm? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 04-06-2009, 02:51 PM Thread Starter
 
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MPT 66mm or 70mm?

Which would be the better choice for a street car, H/C/I full bolt on car that wants to make mid 500whp on race gas and be a street/strip car. 66mm or 70mm w/ .68 A/R?

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post #2 of 11 Old 04-06-2009, 03:19 PM
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70mm at least

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post #3 of 11 Old 04-07-2009, 11:59 AM
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I've got the 66 and Brian from B&G told me it was good to 600rwhp... it'll spool about 400rpm sooner than the 70mm. Either would probably be fine.

'91LX Vert- Stock Shortblock, Stock Cam, Cobra Intake, Edelbrock Performer 1.9's, 42#er's, PMAS 3", AOD, 3.27 gears, B&G 70mm Single, 3500lbs w/ me
Best 1/8- [email protected] with a 1.64 60'
Best 1/4- [email protected] with a 1.66 60'
Funniest 1/4- [email protected] LOL
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post #4 of 11 Old 04-08-2009, 08:14 AM
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Quote:
Originally Posted by Doug Hatton1 View Post
I've got the 66 and Brian from B&G told me it was good to 600rwhp... it'll spool about 400rpm sooner than the 70mm. Either would probably be fine.
Brian told me about the same thing, he said it was good to 500rwhp or so.. I chose to go with the 70

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post #5 of 11 Old 04-08-2009, 08:44 AM
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+1 for T70

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post #6 of 11 Old 04-08-2009, 09:41 AM
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My 66 already made 480rwhp through stock heads and a stock aod! I hope 500rwhp isn't really the limit... although I see no plans for 'stock block splitting power' any time soon.

'91LX Vert- Stock Shortblock, Stock Cam, Cobra Intake, Edelbrock Performer 1.9's, 42#er's, PMAS 3", AOD, 3.27 gears, B&G 70mm Single, 3500lbs w/ me
Best 1/8- [email protected] with a 1.64 60'
Best 1/4- [email protected] with a 1.66 60'
Funniest 1/4- [email protected] LOL
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post #7 of 11 Old 04-09-2009, 10:32 AM
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My 66 already made 480rwhp through stock heads and a stock aod! I hope 500rwhp isn't really the limit... although I see no plans for 'stock block splitting power' any time soon.
How much boost? Intake? Cam?

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post #8 of 11 Old 04-09-2009, 02:11 PM
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The kit has the .7 bar wastegate spring. That's about 10#'s but I see about 12#'s through the exhaust. It made 421rwhp through the exhaust. I uncapped the cutout and we made the 480rwhp run. Honestly, we think it crept up since we were seeing 12 instead of 10 on the capped run. My guess is that it was close to 15#'s. We were fixated on the afr's instead of the boost and didn't see how high it climbed. The afr rose to 11.8 from 11.3 on the capped runs. Stock cam, stock rockers, cobra intake.

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Originally Posted by Speedy911 View Post
How much boost? Intake? Cam?

'91LX Vert- Stock Shortblock, Stock Cam, Cobra Intake, Edelbrock Performer 1.9's, 42#er's, PMAS 3", AOD, 3.27 gears, B&G 70mm Single, 3500lbs w/ me
Best 1/8- [email protected] with a 1.64 60'
Best 1/4- [email protected] with a 1.66 60'
Funniest 1/4- [email protected] LOL
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post #9 of 11 Old 04-09-2009, 02:39 PM
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Originally Posted by Doug Hatton1 View Post
The kit has the .7 bar wastegate spring. That's about 10#'s but I see about 12#'s through the exhaust. It made 421rwhp through the exhaust. I uncapped the cutout and we made the 480rwhp run. Honestly, we think it crept up since we were seeing 12 instead of 10 on the capped run. My guess is that it was close to 15#'s. We were fixated on the afr's instead of the boost and didn't see how high it climbed. The afr rose to 11.8 from 11.3 on the capped runs. Stock cam, stock rockers, cobra intake.
what is your exhaust setup?

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post #10 of 11 Old 04-09-2009, 04:34 PM
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3-1/2" DP to a flowmaster 3-1/2 to (2) 2-1/2 Y, (2) Summit racing superturbo mufflers with turndowns... I think it was mostly the creep that made it make so much more power! Definitely wasn't expecting to see those numbers when we walked over to the graph!


'91LX Vert- Stock Shortblock, Stock Cam, Cobra Intake, Edelbrock Performer 1.9's, 42#er's, PMAS 3", AOD, 3.27 gears, B&G 70mm Single, 3500lbs w/ me
Best 1/8- [email protected] with a 1.64 60'
Best 1/4- [email protected] with a 1.66 60'
Funniest 1/4- [email protected] LOL
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post #11 of 11 Old 04-09-2009, 07:04 PM
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70mm and lol at race gas for 500whp.
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