This is topic Anyone with high compression and blower? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 1993 GT (Member # 3104) on :
 
I have a 306 with 10:5:1 compression currently has a 150 shot of NOS. I f I dont sell the car I want to switch to an S-trim but I've heard this compression is not blower friendly. If I do run an S-trim can I get away with at least 10lbs of boost?
 

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Posted by Cobra5.0JEEP (Member # 1482) on :
 
i think we have the same compression, and we're running 13lbs with stage 2 heads and stage 2 intake and blower cams without the stage 2 heads and intake it would be 20lbs. We're running 110 leaded race gas and it doesn't get near detonation. Infact our engine is too big for the blower. The blower doesn't push enough air for the engine.

[ August 15, 2004, 07:39 PM: Message edited by: Cobra5.0JEEP ]
 

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Posted by 1993 GT (Member # 3104) on :
 
I want to run it on 91 octane of course I would get a custom tuned chip for the car. Do oyu think I can run the stock blower pully and 91 octane?
 

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Posted by 2stangs69-91 (Member # 1951) on :
 
I am running around 9.8 331 with flat tops. with a S trim the only reason I didn't go lower compression was because I am using a water/meth injection under boost.
 

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Posted by 92 LX NOTCH DSS306 AFR185 (Member # 1684) on :
 
Im runnin 9.7 with sc trim runnin 91 octane,soon to add the meth inj.
 

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Posted by 9lbpony (Member # 3510) on :
 
My brother's LS1 ran 12psi with 10.5:1 compression with aluminum heads. It can be done but you'll be pulling a LOT of timing. Alternately you can put some of that timing back on street gas with water/alky injection. It works wonders.

prior to the water/alky it ran peak timing of around 14^. Afterwards it was running 23^ and making a lot more power.
 

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Posted by GTMustangAlisa (Member # 2378) on :
 
I have a 4.6 stroked to a 5.0 with flat tops pushing anywhere from 10.5:1 - 11:1 compression. I want to run nitrous. Does anyone know how well this will work? assembly is all forged. Probe pistons.
 

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Posted by AJBlackGT (Member # 3936) on :
 
Nitrous loves compression, while it is not good if you want to run a healthy amount of boost.
 

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Posted by 67stang (Member # 549) on :
 
the key is octane and A/F ration.

i have a 10.5:1 331, carbed. With a S-trim at 6psi it made 515 rwhp/468lb.ft. yesterday on the dyno.

I use a 3:1 blend of 110 octane and 91 octane.

more here:
http://www.fordmuscle.com/archives/2004/07/supercharger/index.shtml
 

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Posted by FasterDamnit (Member # 442) on :
 

quote:

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Originally posted by 67stang:
I have a 10.5:1 331, carbed. With a S-trim at 6psi it made 515 rwhp/468lb.ft. yesterday on the dyno.

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Posted by 67stang (Member # 549) on :
 
the key is octane and A/F ration.

i have a 10.5:1 331, carbed. With a S-trim at 6psi it made 515 rwhp/468lb.ft. yesterday on the dyno.

I use a 3:1 blend of 110 octane and 91 octane.

more here:
http://www.fordmuscle.com/archives/2004/07/supercharger/index.shtml
 

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Posted by BCINGUU (Member # 2397) on :
 
While it is true that you want lower compression if you're running boost, I have 10.5:1 compression on my all forged motor and am running 12 pounds of boost from my SQ trim. I use water/alcohol injection to raise the octane and it works ok, but I can only run 18 degrees of timing with this setup. Still, that makes over 500 rwhp. http://93cobra.freeservers.com
 

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Posted by 2stangs69-91 (Member # 1951) on :
 
BCINGU you are missing alot of timming you should be able to run alot more. What is your alch/meth mix? I would go to a bigger nozzle and adjust your mix I have talked to The owner of the snow boost cooler and he runs a 70/30 mix of Meth to water on his road track car.

67stang when you going to have that beast to the track?

[ August 20, 2004, 01:57 PM: Message edited by: 2stangs69-91 ]
 

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Posted by BCINGUU (Member # 2397) on :
 
I'm running 60% alcohol, 40% water with a McMaster-Carr brass spray mister at 15gph, the largest one they have.

But, I had rust in my fuel cell that I use as a water/alky tank, and it was clogging the filter, so flow was probably restricted. I replaced the tank and haven't gone out to re-tune it.

You're probably right that I can get a lot more timeing if I can get more water/alky in there.
 

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Posted by 67stang (Member # 549) on :
 

quote:

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Originally posted by 2stangs69-91:

67stang when you going to have that beast to the track?

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