70mm or 76mm - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 14 Old 04-20-2011, 04:34 PM Thread Starter
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70mm or 76mm

I've got a bone stock (Like I just removed the Air Silencer and it still has stock mufflers stock!) 91 GT. I've also got a B&G kit with a PT76GTHS .96A/R turbo. I don't have the funds to build everything I need for the bigger motor I have planned, but I want to turbo the car to learn and tune with the AEM. Should I buy a cheap used MP70 or the likes or put on the 76 and let it be a turd? I had a stock 86 coupe with a 70mm and it was a blast. Wouldn't mind doing something like that while I save up for the 331

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post #2 of 14 Old 04-20-2011, 05:55 PM
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a 70mm can make enough power to split your block, my logic if your on a budget would be pick up the Masterpower 70mm. I just put one on my coupe to learn this whole turbo thing and so far I'm very happy with it

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post #3 of 14 Old 04-20-2011, 06:08 PM
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Originally Posted by blackn2ocoupe View Post
a 70mm can make enough power to split your block, my logic if your on a budget would be pick up the Masterpower 70mm. I just put one on my coupe to learn this whole turbo thing and so far I'm very happy with it
Do not even go with the master power, all you are doing is paying for the warranty. Save the money stick with the On3 70mm and put that money somewhere else.
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post #4 of 14 Old 04-20-2011, 11:12 PM Thread Starter
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I've actually considered this turbo, it's cheap. I'm a little worried as I don't know anything about them. Has anyone used one.
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post #5 of 14 Old 04-21-2011, 12:23 PM
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im thinking about the On3 76 with .68AR
but I havnt seen many people run them yet

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post #6 of 14 Old 04-21-2011, 12:41 PM
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Quote:
Originally Posted by blackn2ocoupe View Post
a 70mm can make enough power to split your block, my logic if your on a budget would be pick up the Masterpower 70mm. I just put one on my coupe to learn this whole turbo thing and so far I'm very happy with it
Not really sure why people say this all the time. I mean a block can split on a mild hci combo.

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post #7 of 14 Old 04-21-2011, 02:45 PM
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I would run the turbo you have, at most buy a smaller exh housing for it. Run like 6-8psi and enjoy it.

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post #8 of 14 Old 04-22-2011, 06:39 AM
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Small boost, small turbo. Big boost, big turbo. No need to run a 76mm if your not going to push the boost past 15-18psi.

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Running street tires at the track is like wiping your ass with a turd.
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post #9 of 14 Old 04-22-2011, 09:29 AM
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By the time you buy the exhaust housing you will be a good portion of the way to an mpt70. Grab a deal on a used one and sell it again when you are ready. The car will work better with a smaller turbo. Something even smaller then the 70 could probably work if you comb the message boards for stuff for sale.

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post #10 of 14 Old 04-22-2011, 10:39 AM
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Small boost, small turbo. Big boost, big turbo. No need to run a 76mm if your not going to push the boost past 15-18psi.
I have never ran 15-18psi, should I sell my 76? I plan to eventually though haha.

Boost is just a #, 12psi on my car may be 20psi on yours.

I would keep the 76 since you already have it, I like to do things simple though. I went 9's on a MPT70, so either turbo has the potential to make great power. Also for the record their is almost no spool diff from my MPT70 to my 76, both .96


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post #11 of 14 Old 04-22-2011, 01:51 PM
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Boost is just a #, 12psi on my car may be 20psi on yours.
If your running a 230cc head, on 400ci 8000rpm monster yes, it probably would be.

Most of us however are in the 300-350ci displacement range with similar flow characteristics. 2-3psi range difference normally.

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post #12 of 14 Old 04-22-2011, 03:13 PM
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My point is boost is only backpressure, I see you missed that completely. I wasn't ACTUALLY compairing my combo to anyones.
On my car (many varibles, to many to compair) it took 10psi on a MPT70 to run a 9 sec pass. I just dont agree with the blanket statement is all.

"No need to run a 76mm if your not going to push the boost past 15-18psi"

That makes no sense to me as boost is just a #. Cars can be very fast and make great power on mild boost regaurdless of the turbo size. Heck a 76 on this car would be great on low boost with plenty of room to upgrade! Or end up like me, buy the MPT70...outgrow it and then get a 76gts again haha.

That's all I was getting at.

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post #13 of 14 Old 05-02-2011, 04:00 PM
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Look at a compressor map and try to get a general consumption chart of your vehicle. Compare and be sure to account for efficiency of your setup. Good luck.
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post #14 of 14 Old 05-02-2011, 04:26 PM
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Quote:
Originally Posted by 4Jenna View Post
My point is boost is only backpressure, I see you missed that completely. I wasn't ACTUALLY compairing my combo to anyones.
On my car (many varibles, to many to compair) it took 10psi on a MPT70 to run a 9 sec pass. I just dont agree with the blanket statement is all.

"No need to run a 3.4 whipple if your not going to push the boost past 15-18psi"

That makes no sense to me as boost is just a #. Cars can be very fast and make great power on mild boost regaurdless of the turbo size. Heck a 76 on this car would be great on low boost with plenty of room to upgrade! Or end up like me, buy the MPT70...outgrow it and then get a 76gts again haha.

That's all I was getting at.
There i fixed it...
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