What turbo set-up for a stock block 331? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 11 Old 10-28-2007, 09:13 PM Thread Starter
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What turbo set-up for a stock block 331?

I am having a 331 built as we speak and am considering a turbo or two for it. I have an S-Trim on my current 1991 302 and like it but I am looking for more forced induction power down low and in the middle. The heads for the new motor are used, race ported Trick Flow High Ports. The previous owner made 996hp on a 347 with a Pro Charger F-2 so I know the heads are healthy. I also have a Holley SysteMax II intake, bla, bla, bla...the usual bolt-ons. My S-Trim currently has a 2-3/4" pully and makes close to 16#s of boost at 6,500 rpm. Would a big turbo or two smaller ones make more power throughout the rev range or would I be wasting my time and money? Supposedly the S-Trim will support upwards of 680hp, supposedly. Should I go turbo? If so, where should I look to purchase a kit from?

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post #2 of 11 Old 10-29-2007, 12:06 AM
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Is this std block ? Then the the power levels are well high enough to split it...
A single T04z,Gt40, T70 or twin T3's, some T3/4 hybrids is more than enough to crack open a std block.. Which btw according to Ford and well documented on T.M.com how much power they are capable of before ... bang!!! That's around 500 fwhp..


1991 XR8 Australian Falcon TFS induction
2014 Falcon GTE Supercharged Coyote

85 Lb inj Custom cam ,P 2000 Haltech ecu...4x's 2 coil wasted spark ignition.Twin SC 61-2s with Dart block, 330/4340 Crank, Oliver rods,7.9/ comp c C.P pistons.. 482 rwkw/ 646 rwhp..A.P 4 pot brakes...TKO
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post #3 of 11 Old 10-29-2007, 09:26 AM
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Having BTDT with a stock block 331, I would just use an SC because the blocks just are not all that forgiving. Have you actual ran this 331 or is it just built? The added cubes will help out a good bit for power down low.

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post #4 of 11 Old 10-29-2007, 10:32 AM Thread Starter
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The block is being machined today and yes, it is stock. Do turbos really make that much more power than a super charger?
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post #5 of 11 Old 10-29-2007, 10:40 AM
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They make a good bit more of torque but you could get a 680hp turbo just like you could get a 680hp SC. Also the power obvious comes on and stays on very differently between the two. Of course 680hp is usually a lot more power than a stock block will last at, yes I know some make it work but look at all the countless more examples of the failures out there. How much power do you want to make that your budget and the rest of the car can really support? I have had my fair share of SC combos and they are a decent cost effective way to make power up to a certain point and that point is still above the breaking point of a stock block.

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post #6 of 11 Old 10-29-2007, 12:59 PM
 
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the turbo is a little easier on the motor because it does not put pressure on the front of the crank like a blower. the blower will make more than enough power to break the block. i would suggest you not to spend money on a turbo and use the money towards a sportsman block or better like the boss block. then you could put a t-76 on it and go wild.
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post #7 of 11 Old 10-29-2007, 01:09 PM
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Of course upgrading the block and doing a turbo is the wisest thing to do. But that comes back to my question of how much power does he want to make that his budget and the rest of the car can really support? More power means more supporting hardware which means more money. If one can not afford the better block at time of engine build then perhaps the fuel system, the tranny, the rear end, and so on is also out of their budget to take advantage of what the turbo route will easily give.

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post #8 of 11 Old 10-29-2007, 07:24 PM
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Go Sportsman Dart not Ford Sportsman....
Turbo's are far easier on block and rotating assembly as there power doesn't hit as hard. There is some pressure on piston on exhaust stroke, where most stretch & damage can happen...
Up to 450 h.p with std block..
650 to 700 351 block...
The roller 5.0 is the weakest of all 5.0 blocks...

1991 XR8 Australian Falcon TFS induction
2014 Falcon GTE Supercharged Coyote

85 Lb inj Custom cam ,P 2000 Haltech ecu...4x's 2 coil wasted spark ignition.Twin SC 61-2s with Dart block, 330/4340 Crank, Oliver rods,7.9/ comp c C.P pistons.. 482 rwkw/ 646 rwhp..A.P 4 pot brakes...TKO
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post #9 of 11 Old 10-29-2007, 09:42 PM
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zooban atleast go find a pre 75 302 block. They are alot stronger than the late model blocks. I got mine for $100.

306, TFS heads, Victor EFI, XE282, Tremec, 10" tires, and NX nozzle
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post #10 of 11 Old 10-29-2007, 10:00 PM
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If the block was not being worked on already I would say stay with the 302. The money spent on 331 could buy a good block. The stock parts are no weaker then the block it self.

Sence you have started just stay with the blower. Save the money for a good block, I wish I would have done that way the first time.


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post #11 of 11 Old 10-30-2007, 09:13 PM Thread Starter
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Thanks guys, I am searching for a block now. If luck serves me well I will find a used Dart or similar. Eventually I gotta try a turbo!
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