Compression ratio and HOT weather
Thread Starter
Teching In
Joined: Dec 2003
Posts: 8
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From: Gilbert, AZ
Compression ratio and HOT weather Do you guys think 11:1 is too much for Arizona(we have 91 octane gas and 110F summer days are common)? I'm about to buy some AS 5.3's and I'm deciding on the compression ratio to go with. I know the LS6 runs 10.5:1 with no problems, and Jay told me he could go as low as 10.8:1 with the 5.3's. I'd like to run 11:1, just wanted to see what you guys thought. Thanks.
It will GREATLY depend on your tune how much compression you can run. Being in AZ and only using 91 octane, I would go on the safe side and run 10.8:1. The difference wouldn't even be 5 HP between that and 11:1, and it'd be worth the security. Not really worth it when you take a step back and realize it'd only be a couple more HP and more risk of detonation....JMO
josh
josh
Thread Starter
Teching In
Joined: Dec 2003
Posts: 8
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From: Gilbert, AZ
Damian
Thanks for the information Josh; this is exactly what I was looking for. As you can see from my choice of cam(TR220), I'm not looking to set any hp records, just to have a dependable daily driver with same extra teeth. Looks like the 10.8:1 is gonna be my choice. It was tuned after the cam install and will be tuned again after the heads go on. The shop is local(Xtreme Motorsports) and they understand I'm not looking to push the envelope with the tune.
4thGENRETARD
I'm in Arizona so it would be seriously dry
, thanks.
Thanks for the information Josh; this is exactly what I was looking for. As you can see from my choice of cam(TR220), I'm not looking to set any hp records, just to have a dependable daily driver with same extra teeth. Looks like the 10.8:1 is gonna be my choice. It was tuned after the cam install and will be tuned again after the heads go on. The shop is local(Xtreme Motorsports) and they understand I'm not looking to push the envelope with the tune.
4thGENRETARD
I'm in Arizona so it would be seriously dry
, thanks. I have been running 11.1:1 CR for the past year without any problems. I would run a gallon or two of 100 unleaded (in a full tank of 91) durring the summer if I was going to go out "hunting" on Bell but other than that I just ran straight 91. One guy I know is running 11.2:1 and another had 10.8:1.
AZ isn't that big of a deal 90% of the year if you have the car set up to run cool (colder T-stat, fans set lower, etc...). The only real time I had problems was August (and thats a no duhhh).
AZ isn't that big of a deal 90% of the year if you have the car set up to run cool (colder T-stat, fans set lower, etc...). The only real time I had problems was August (and thats a no duhhh).
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Thread Starter
Teching In
Joined: Dec 2003
Posts: 8
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From: Gilbert, AZ
Originally Posted by JZ'sTA
Id move.......
J/KI live in some shatty weather myself during the summer.
However we do have 93 octane at every gas station.
J/KI live in some shatty weather myself during the summer.
However we do have 93 octane at every gas station.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
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Originally Posted by blownC6
LOL, I remember one summer about 15 years ago or so, it got up to 122(no BS) that would have been the summer to move.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
) and have my fans set to come on about 170 and 180. 
TECH Fanatic
Joined: Jun 2003
Posts: 1,070
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From: Further South than Hell
Originally Posted by 2001CamaroGuy
I run straight distilled water and water wetter (no need for the "anti-freeze" out here ) and have my fans set to come on about 170 and 180.
) and have my fans set to come on about 170 and 180.
Originally Posted by 4thGENRETARD
Antifreeze is also a coolant in the Summer. you would get better results with a 50/50 mix and water wetter.
I started doing this and the car runs cooler than it did with 50/50 and water wetter
Thread Starter
Teching In
Joined: Dec 2003
Posts: 8
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From: Gilbert, AZ
Originally Posted by 2001CamaroGuy
it says right on the bottle "for better cooling in non-freezing environments, run straight water and water wetter"
I started doing this and the car runs cooler than it did with 50/50 and water wetter
I started doing this and the car runs cooler than it did with 50/50 and water wetter
Here's a link to Redline's tech data on Water Wetter, interesting reading. http://www.redlineoil.com/redlineoil/wwti.htm
TECH Junkie
Joined: Jan 2002
Posts: 3,015
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From: At the office
10.8:1 here and 91 Octane....I run a bigger cam though which helps bleed off some of the compression so I don't have to worry as much. WOT all day long when its 115 degrees and no problem
I personally wouldn't run 11:1, but if I did I'd mix a little 100+ octane gas like 2001CamaroGuy said.
I'd also recommend an EWP.
I personally wouldn't run 11:1, but if I did I'd mix a little 100+ octane gas like 2001CamaroGuy said.
I'd also recommend an EWP.
