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post #1 of 13 (permalink) Old 12-13-2006, 01:25 PM Thread Starter
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splitport turbo kit

ive seen a few 99+ 3.8L mustangs running around with a turbo kit. typically only pushing 6-8 lbs of boost, but i was curious how it would hold up to stroked 3.8L with a splitport swap. i have 10.3.1 compression and wasn't sure if i was at a safe ratio for a turbo.

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post #2 of 13 (permalink) Old 12-13-2006, 10:45 PM
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a 10 comp would be quite high for a boosted setup. You would have problems tuning and would probally get some detonation. The ideal comp for a turbo would be between 8-9 comp. The lower the comp the more boost you can crank up depending on the durability of the engine. At low RPMs and idle the com will be at say 8 comp but under boost the comp will rise as boost rises.

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post #3 of 13 (permalink) Old 12-14-2006, 10:40 AM Thread Starter
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thanks for the clarification on that, sucks that i cant make it happen right now. mabay down the road on next rebuild i can change out the shortblock and have some real fun..

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post #4 of 13 (permalink) Old 12-14-2006, 12:07 PM
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Quote:
Originally Posted by twin turbo 281
a 10 comp would be quite high for a boosted setup. You would have problems tuning and would probally get some detonation. The ideal comp for a turbo would be between 8-9 comp. The lower the comp the more boost you can crank up depending on the durability of the engine. At low RPMs and idle the com will be at say 8 comp but under boost the comp will rise as boost rises.
8:9 is still high(you could get it lower than that), I would get it down as much as possible. If you run high compression ratio on the engine, the more higher octane would you need for it to not detonate. Even at that, sometime it will detonate.

Quote:
Originally Posted by 4.3Lcougar
thanks for the clarification on that, sucks that i cant make it happen right now. mabay down the road on next rebuild i can change out the shortblock and have some real fun..
Slap it on and do not run more than 6psi and you would be good.


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post #5 of 13 (permalink) Old 12-14-2006, 05:00 PM
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A good intercooler and a methanol injection kit will allow you to run more boost...just don't get too agressive with the timing. Lots of the mustang guys are running turbos on stock compression motors.

With 9.1:1 static compression I'm running 15 pounds on 93 octane with methanol injection set to start spraying when boost goes over 7 pounds. I could probably get away with about 25 degrees of advance, but not going any higher than 20 to stay safe.

David

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Last edited by David Neibert; 12-15-2006 at 06:26 AM.
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post #6 of 13 (permalink) Old 12-14-2006, 05:35 PM Thread Starter
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Quote:
Originally Posted by David Neibert
A good intercooler and a methanol injection kit will allow you to run more boost...just don't get too agressive with the timing. Lots of the mustang guys are running turbos on stock compression motors.

With 9.1:1 static compression I'm running 15 pounds on 93 octane with methanol injection set to starting to spray when boost goes over 7 pounds. I could probably get away with about 25 degrees of advance, but not going any higher than 20 to stay safe.

David



methanol injection um, never heard of that. also if i did everything mentioned above at 6psi being a safe boost level, what gains could be expected. and what all does it entail for installing the methanol injection????

sorry im still learning the turbo world. its really confusing, LOL

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post #7 of 13 (permalink) Old 12-14-2006, 06:05 PM
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Snow performance makes a popular methanol injection setup. You can find their kits on Summit's website. You would want the stage 1 kit for your application.

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post #8 of 13 (permalink) Old 12-15-2006, 06:28 AM
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Quote:
Originally Posted by racecougar
Snow performance makes a popular methanol injection setup. You can find their kits on Summit's website. You would want the stage 1 kit for your application.

-Rod
Yes....that's the brand I'm using on both of my cars.

David

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post #9 of 13 (permalink) Old 12-15-2006, 06:31 AM
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Quote:
Originally Posted by 4.3Lcougar
methanol injection um, never heard of that. also if i did everything mentioned above at 6psi being a safe boost level, what gains could be expected. and what all does it entail for installing the methanol injection????

sorry im still learning the turbo world. its really confusing, LOL
Suggest you spend a few days/weeks reading about turbos at this website.

http://www.turbomustangs.com/forums/

David

PS: Don't ask questions over there...just read for now.

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post #10 of 13 (permalink) Old 12-15-2006, 06:46 PM
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6psi on your engine would be fine with very conservative timing. Even then you are still looking at a 30% HP/TQ increase. My car with a less effecient Vortech supercharger at 9psi (peak) gained 54% HP and 29% more torque over my N/A engine, I'm only making 7psi boost where the 54% HP gain is seen.

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post #11 of 13 (permalink) Old 12-15-2006, 08:36 PM
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I'm using a Snows kit also, I picked up ~20hp running just straight water.
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post #12 of 13 (permalink) Old 12-15-2006, 11:44 PM Thread Starter
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Quote:
Originally Posted by Eric Z.
I'm using a Snows kit also, I picked up ~20hp running just straight water.

can a methanol kit be used without a turbo? if not how hard is the install....?? PICS?????

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post #13 of 13 (permalink) Old 12-15-2006, 11:53 PM
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Quote:
Originally Posted by 4.3Lcougar
can a methanol kit be used without a turbo? if not how hard is the install....?? PICS?????
It is generally used on vehicles with forced induction, as it cools the air charge while deterring detonation. I doubt you would see any real gain on a naturally aspirated engine at the power levels that we're talking about here.

-Rod

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