331 10.8:1 and turbo? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 20 Old 09-22-2012, 04:00 PM Thread Starter
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331 10.8:1 and turbo?

Thinking of buying a nicely built Foxbody. Right now its running a 10.8.1 compression 331 putting out 385 rwhp. I'd like to add some boost. Not sure yet what cc heads they are or any other details. Would it be safe to add a 6-8 psi turbo assumung it gets a good tune?


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post #2 of 20 Old 09-22-2012, 04:02 PM
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Probably on race gas

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post #3 of 20 Old 09-22-2012, 05:02 PM
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I'd say it would be safe at 6-7psi on 93 with conservative timing, much more and i'd run e85 or race gas.

Would probably make north of 500hp like that as well

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post #4 of 20 Old 09-22-2012, 05:48 PM Thread Starter
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Well if i jump on this a good tune will definitely be in order

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post #5 of 20 Old 09-22-2012, 07:22 PM
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Go e85...

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post #6 of 20 Old 09-22-2012, 08:44 PM
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e85 for sure if its available near you
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post #7 of 20 Old 09-22-2012, 10:50 PM
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The cam plays a large roll. My buddy runs 11:1 and 22psi on 91 octane and a snow stage 2. Makes about 880rwhp

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post #8 of 20 Old 09-22-2012, 11:53 PM Thread Starter
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no E85 near me, will have to stick with 93 and maybe water /meth

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post #9 of 20 Old 09-23-2012, 10:40 AM
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is it a stock block or an upgraded block......I don't see the compression ratio as an issue, the new 5.0 mustangs are 11:1 compression and there are plenty of guys running 6-10 pounds of boost on superchargers and turbos without issue. I would definitely run meth since you don't have E85 and keep the boost to 6-8 pounds, should put you around 500 to the tire and into the 10's
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post #10 of 20 Old 09-23-2012, 12:29 PM
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Quote:
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is it a stock block or an upgraded block......I don't see the compression ratio as an issue, the new 5.0 mustangs are 11:1 compression and there are plenty of guys running 6-10 pounds of boost on superchargers and turbos without issue. I would definitely run meth since you don't have E85 and keep the boost to 6-8 pounds, should put you around 500 to the tire and into the 10's


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post #11 of 20 Old 09-24-2012, 12:51 PM
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I ran a B-trim Vortech on similar compression and at 12lbs of boost. It was a torquey monster to say the least. I had to take out a lot of timing and was dumping a fair amount if fuel. This was back before dyno tunes and custom programming of the ecu. It can be done, just not if you get greedy with boost. If it is a stock block then I'd not waste my time doing it even though will admit my combo was with a stock block.


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post #12 of 20 Old 09-25-2012, 10:40 PM
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No E85 around? Damn shame, would be perfect for this.

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post #13 of 20 Old 09-25-2012, 10:42 PM Thread Starter
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might need to buy a copper still and make my own meth, er i mean ethanol

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post #14 of 20 Old 09-29-2012, 11:19 AM
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I'd stay away from adding boost to a 10.8:1 pushrod motor. If you choose to ignore that, pull plenty of timing and be very conservative on the tune. Also, you'll need an intercooler and meth or E85 to get away with it.
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post #15 of 20 Old 09-29-2012, 11:32 AM
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If I was able to do it with a Vorturd and no After/inter cooler then I see no reason why if someone is cautious with a turbo that they could not do it with just an intercooler. I do not see that meth and/or E85 being requirements to do it. But the key point here is you have to be cautious/conservative with your tune and boost levels.

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post #16 of 20 Old 09-29-2012, 01:31 PM
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Lots of guys run that c/r and higher on lots of boost, they make big power also. My next motor will likely be in that range, its all about what you wanna do with your car.

Good fuel and tune up is a must though imop. For a lil street car and low boost I would rather have a low c/r motor.

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post #17 of 20 Old 09-29-2012, 01:47 PM
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Lots of guys run that c/r and higher on lots of boost, they make big power also. My next motor will likely be in that range, its all about what you wanna do with your car.

Good fuel and tune up is a must though imop. For a lil street car and low boost I would rather have a low c/r motor.
Yeah, 12-15 years ago when I was having a local race engine shop build my old 347 for a turbo setup the owner of the shop wanted to do I think it was 10.5:1 compression. But me being the young know it all insisted no it should be 8:1. He even pointed out how he did a number of turbo engines for a race team and they all were the compression range he was recommended and how they all worked out great. I ultimate still went with what I wanted but in hindsight I really should have not been so know it all and listened to the expert.

Having how that old vorturd setup with the 10.5:1 compression while it was fun to some extent it really made a completely unusable amount of low end torque. For a street car I do not think it was the best of setups. But back then I wanted more power and the motor was already in my car and I got a great deal on a used vorturd.

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post #18 of 20 Old 09-29-2012, 04:22 PM
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Just finished adding a turbo to my 408 which is 10.2:1. Other than injectors and air meter only other changes to the motor was the cam. If you get a custom cam for it im sure it wouldn't b a problem. I had the same concerns but after researching it there are plenty of people doing it. Im hoping to b able to run 8lbs on pump gas. I'm getting it tuned in a few weeks and I'll post up the results.

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post #19 of 20 Old 10-12-2012, 04:35 PM
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I wouldn't chance it...I'd run dual nozzle washer fluid. E85 has saved my arse several times.


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post #20 of 20 Old 10-12-2012, 05:28 PM
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My setup is 10 to 1 with 9-10lbs out of a vortech. So far I have blown one head gasket at the track. I am thinking it was BC I didn't run race fuel that one time but on the streets I have never had a problem with 93 pump gas. Normally I run race fuel at the track but that one time I got cheap and said screw it. I just bought a used snow stage 2 kit and some mls head gaskets for extra insurance. I can only speak from my own experience but I think it can be done no problem with the right tune. If you do decide to do it make sure you have enough fuel and know your a/f.

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