Help with Boost On 347 w/10.5-1 Compression - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 12 Old 07-23-2009, 01:43 AM Thread Starter
 
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Help with Boost On 347 w/10.5-1 Compression

Hey there Guys! I Have the 95 with a Brand new 347 stroker, running 10.5-1 compression, I want to get this Boost Brothers turbo kit and slap it on her, Mabey get a few more ponies outa the old girl! So Do you think running 5-7 PSI on that engine would be a Bad idea... Im slowly learning here.. and this Forced Induction is a whold new ballgame!
Thanks for the help guys!

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post #2 of 12 Old 07-23-2009, 05:54 AM
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Originally Posted by rjw347sn95 View Post
Hey there Guys! I Have the 95 with a Brand new 347 stroker, running 10.5-1 compression, I want to get this Boost Brothers turbo kit and slap it on her, Mabey get a few more ponies outa the old girl! So Do you think running 5-7 PSI on that engine would be a Bad idea... Im slowly learning here.. and this Forced Induction is a whold new ballgame!
Thanks for the help guys!
I ran 8 psi for a long time on a 306 w/ 10.4:1 and pump gas
I did end up lunching 3 pistons though.

I would sell the motor and put a stocker in their and then turbo it


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post #3 of 12 Old 07-23-2009, 10:49 AM
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Put a meth kit on it and run the SOB.

My friends 11:1 347 with 8 psi, 93 pump gas and meth ran a 9.5 @ 142 all day long.
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post #4 of 12 Old 07-23-2009, 11:09 AM
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Put a meth kit on it and run the SOB.

My friends 11:1 347 with 8 psi, 93 pump gas and meth ran a 9.5 @ 142 all day long.
I'm almost done building a 347 with 10.4:1 compression and this is exactly what I plan on doing(blower not turbo). People will tell you its better to run lower compression with boost, and its true, it will give you a larger margin of error in your tune and allow you to run more boost safely. But by no means is it impossible to have a decent amount of compression while running boost. You can make more power on less boost with higher compression, you just need to watch your tune a bit closer. You can run a water/meth kit to spray only while in boost, and it will raise your octane level while lowering the air intake temps.

Idealy for turbo/supercharged apps, you'd want to lower compression and raise boost. Allowing you to make more power and keep the tune safe. But it can be done with your compression ratio.
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post #5 of 12 Old 07-23-2009, 01:06 PM
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As long as you tuner knows what he's doing you should be fine running boost on top of 10.5 compression.... its all in the tune.

Nothing but slow chebby's right now.....
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post #6 of 12 Old 07-23-2009, 04:16 PM
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As long as you tuner knows what he's doing you should be fine running boost on top of 10.5 compression.... its all in the tune.
My last Mustang was 10.25:1 compression running 10 psi non-intercooled S-trim on pump gas with meth. it's all in the tune.
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post #7 of 12 Old 07-23-2009, 04:39 PM
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im running 8.5:1. BUT there are great upsides to higher, for get the tune. guys have that mastered. especially with a huge intercooler/and meth.


from where i sit. fuel is the big issue for turbo. BSFC's worse than .55 are common. you run a higher CR and sequeeze a LOT more out of the available fuel you wont join me and others who have to throw a freakin ton at it.

the other side of it is: if i upgrade the fuel theres a much higher limit for boost, and it will make up for the lower compression at some point.

96 mustang GT-93 teksid 4v forged: ported heads, kellogg crank, billet i-beams, CP forged pistons, 9.4:1, BIG turbo, 4x28x12 fmic, big boost.

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post #8 of 12 Old 07-23-2009, 04:40 PM
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its just a turn of the boost controller away.

96 mustang GT-93 teksid 4v forged: ported heads, kellogg crank, billet i-beams, CP forged pistons, 9.4:1, BIG turbo, 4x28x12 fmic, big boost.

2011 GT 300A, 3.73, M6, spoiler delete, brembos
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post #9 of 12 Old 07-23-2009, 05:46 PM
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im running 8.5:1. BUT there are great upsides to higher, for get the tune. guys have that mastered. especially with a huge intercooler/and meth.
That is mearly a BAND AID for people that cant tune or do a less than spectacular job at it.

Take it to a tuner that knows his stuff, let him take his time to dial it in and drive the car for a long time.

Nothing but slow chebby's right now.....
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post #10 of 12 Old 07-24-2009, 08:00 PM
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Originally Posted by OrangeSVT03 View Post
That is mearly a BAND AID for people that cant tune or do a less than spectacular job at it.

Take it to a tuner that knows his stuff, let him take his time to dial it in and drive the car for a long time.
u lookin for an argument from me? you restated what i said, but did it implying you know something i dont.

i chose 8.5 for me. im not looking for every VE. instead i let boost do the job. its not a cop-out. ot a band -aid, go look for someone else to start crap with. the horsepower limit i set for myself can be exceeded easily with another 4 lbs.

i also detune it and run regular unleaded and get 31mpg. not going to do THAT with 10.5:1


96 mustang GT-93 teksid 4v forged: ported heads, kellogg crank, billet i-beams, CP forged pistons, 9.4:1, BIG turbo, 4x28x12 fmic, big boost.

2011 GT 300A, 3.73, M6, spoiler delete, brembos

Last edited by assasinator; 07-24-2009 at 08:03 PM.
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post #11 of 12 Old 07-24-2009, 09:30 PM
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im running just over 8 lbs with a 347 at somewhere between 10.5-11.0-1 compression. No matter what I did with timing and fuel i would get some pinging. I put a meth kit on it and havent had a problem since.

When I had procharger I could get away without the meth because of the linear boost curve, now with the boost slamming on theres no way to get around using meth.

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post #12 of 12 Old 07-25-2009, 02:41 PM
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Originally Posted by stangjumper View Post
Put a meth kit on it and run the SOB.

My friends 11:1 347 with 8 psi, 93 pump gas and meth ran a 9.5 @ 142 all day long.
+1, the higher the compression the motor the higher the octane needed to keep it safe. nothing wrong with running high compression with boost as long as you do it right

TWIN TURBO!! Because bottles are for babies and superchargers blow
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