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Can we Discuss Effective Compression,Elevation,Fuel type?

Can we Discuss Effective Compression,Elevation,Fuel type?

 
Old 12-30-2018, 06:50 AM
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Default Can we Discuss Effective Compression,Elevation,Fuel type?

Ok. So It's been a while since my last turbo charged car. While it was a paltry entry level system with moderate goals for the time (Think TurboEdit). Included are screen shots of the same build,only different compressions

I am currently researching everything for my new turbo charged project.
I am going to be using E85.
My Elevation is 1558ft. Which changes my Static Compression ratio.
Had planned on 10.1:1 which at my elevation turns into 10.03 with an Effective ratio of 19.64:1 at a moderate 15 psi




This could be the difference in 500+hp or falling short

The Other option I have is 10.8:1.
Which puts my Static (Using B16 Head in both cases) to 10.9:1
and pushes my Effective to 21.41



I know plenty of builds are running way more extreme compression than I am even in some cases as a street duty

Mine will not be a daily driver,but I would like to enjoy as often as possible when the weather is nice.

My question is how much Effective Compression is too much with my chosen choice of fuel? Or am I just being a worry wart?

all the while hoping to enjoy the car for 50-60k or more before any real work would need to be done.

Last edited by sikefcrx89; 12-30-2018 at 07:21 AM.
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Old 12-31-2018, 05:23 AM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Doing some more reading,it looks as if the marginal gain from my would be 10.03 to 10:9.1 while using e85 would take away a ton of safety margin. So ragged edge without a safety net that could potentially last,or give myself a margin of error and whatever it makes is whatever it makes..
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Old 12-31-2018, 08:26 AM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by sikefcrx89 View Post
Doing some more reading,it looks as if the marginal gain from my would be 10.03 to 10:9.1 while using e85 would take away a ton of safety margin. So ragged edge without a safety net that could potentially last,or give myself a margin of error and whatever it makes is whatever it makes..
If using E85, I would be a bit less concerned with higher compression than 93 pump.
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Old 12-31-2018, 08:33 AM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by Txdragon View Post
If using E85, I would be a bit less concerned with higher compression than 93 pump.
Being I can go from my 1558ft to a short 20 min drive away and be 2300-3200ft in elevation I am leaning more to just play the better safe than sorry card.
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Old 12-31-2018, 08:43 AM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by sikefcrx89 View Post
Being I can go from my 1558ft to a short 20 min drive away and be 2300-3200ft in elevation I am leaning more to just play the better safe than sorry card.
So punch that elevation into ZW and see what it looks like.
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Old 01-02-2019, 02:14 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by Txdragon View Post
So punch that elevation into ZW and see what it looks like.
Effective only drops the higher the altitude.

at 10.9:1 at 2300ft it goes from 21.51 at 1558ft to 21.11 and at 3200ft it drops to 20.75 from a base where my home is located at 1558ft.

I am looking for a clean comparison of Effective compression and Elevation. 3/4 of the time will be semi flat ground with a +/- of 1-200ft. So E85 with the 10.9:1 runs safely at effective compression listed? Tuning will play a real aspect,but tuners are hours away under a separate set of circumstances.

Zeal Does Not factor in Fuel Type
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Old 01-02-2019, 02:19 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

I'd be less worried about compression and more about the elevation changes itself. That's gotta play hell with A/F maps.
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Old 01-02-2019, 02:20 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

I am reading 15-16.1 Static. Maybe there are some folks here that a higher comp setup that can shed light..
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Old 01-02-2019, 02:22 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by Txdragon View Post
I'd be less worried about compression and more about the elevation changes itself. That's gotta play hell with A/F maps.
Why I am kind worry warting. Elevation change will make the car richer,so being ragged edge and planning out the drastic elevation changes could be a hindrance.
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Old 01-02-2019, 02:24 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

One of the elevation changes I will be fighting. Highest point here is 4397ft

30 Mins from my place

https://en.wikipedia.org/wiki/Shenandoah_Mountain
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Old 01-02-2019, 02:54 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by sikefcrx89 View Post
Why I am kind worry warting. Elevation change will make the car richer,so being ragged edge and planning out the drastic elevation changes could be a hindrance.
because compression lowers with elevation, I wouldn't see an issue with the 10.9:1. Because you'll be using E85, I wouldn't worry about higher compression. Because you'll be changing elevations throughout your travels in this car, your tune is the biggest concern.
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Old 01-02-2019, 04:05 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

You will be fine with that compression ratio at any altitude on a turbo engine on e85. Don't worry man, that is plenty in the safe range so I wouldn't sweat it.
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Old 01-02-2019, 04:09 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

Originally Posted by K7-1Ktrevor View Post
You will be fine with that compression ratio at any altitude on a turbo engine on e85. Don't worry man, that is plenty in the safe range so I wouldn't sweat it.
^^ Info from a tuner!
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Old 01-02-2019, 04:15 PM
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Default Re: Can we Discuss Effective Compression,Elevation,Fuel type?

I will contact a couple guys and get some more input. Not saying I wouldn't take him at face value,but this is the last Honda I ever do.
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