compression vs boost
11-22-2006, 07:22 PM
#26
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Re: (JDogg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg »</TD></TR><TR><TD CLASS="quote">this is easy
lower compression = inefficient I ran 8:1 back in my f1 days.... !
higher compression= 93 more TQ and less timing!
higher compression + Methanol = Mad boost
</TD></TR></TABLE>
Fixed.
lower compression = inefficient I ran 8:1 back in my f1 days.... !
higher compression= 93 more TQ and less timing!
higher compression + Methanol = Mad boost
</TD></TR></TABLE>Fixed.
11-22-2006, 07:29 PM
#27
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Re: (MidShipCivic)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic »</TD></TR><TR><TD CLASS="quote">
Fixed.
</TD></TR></TABLE>
not really... noone runs high compression unless they arent making **** for power. dont believe everything you read/people tell you..
low compression does not mean less power, i did a 2liter b16 that is close to 8:1 compression, stock b16 head and cams, made 350hp on 8psi.. which is actually pretty typical of a good setup.
Fixed.
</TD></TR></TABLE>
not really... noone runs high compression unless they arent making **** for power. dont believe everything you read/people tell you..
low compression does not mean less power, i did a 2liter b16 that is close to 8:1 compression, stock b16 head and cams, made 350hp on 8psi.. which is actually pretty typical of a good setup.
11-22-2006, 07:47 PM
#28
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Re: (JDogg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg »</TD></TR><TR><TD CLASS="quote">not really... noone runs high compression unless they arent making **** for power. dont believe everything you read/people tell you..
low compression does not mean less power, i did a 2liter b16 that is close to 8:1 compression, stock b16 head and cams, made 350hp on 8psi.. which is actually pretty typical of a good setup. </TD></TR></TABLE>
It was a joke.
I've read / been told? Pls.
I do it.
Low compression sucks imo.
Stroke/Displacement/Compression combined is the Midship way.
Even my 4G63 was 9.5:1 with 100mm crank when I was done with the motor.
low compression does not mean less power, i did a 2liter b16 that is close to 8:1 compression, stock b16 head and cams, made 350hp on 8psi.. which is actually pretty typical of a good setup. </TD></TR></TABLE>
It was a joke.
I've read / been told? Pls.
I do it.
Low compression sucks imo.
Stroke/Displacement/Compression combined is the Midship way.
Even my 4G63 was 9.5:1 with 100mm crank when I was done with the motor.
11-22-2006, 08:01 PM
#30
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Re: (vaporboy12)
now your talking detenation is my middle name!<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vaporboy12 »</TD></TR><TR><TD CLASS="quote">10:1 compression 45-50psi of boost FTW </TD></TR></TABLE>
But back to reality speaking of 10:1 I'm doing that on my project V8 240. Gasoline is a crappy fuel but tuning and tuner is God in this type of world.
11-22-2006, 08:49 PM
#32
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Re: (vaporboy12)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MidShipCivic »</TD></TR><TR><TD CLASS="quote"> now your talking detenation is my middle name!
But back to reality speaking of 10:1 I'm doing that on my project V8 240. Gasoline is a crappy fuel but tuning and tuner is God in this type of world.
</TD></TR></TABLE>
Ignorance is bliss. Tuners aren't magicians. If the engine detonates because you have 12:1 compression and 30psi on 91 octane there's not a damn thing you can do about it. If the setup is wrong, there's nothing the tuner can do to make it right, you can only make the best of a situation.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....
But back to reality speaking of 10:1 I'm doing that on my project V8 240. Gasoline is a crappy fuel but tuning and tuner is God in this type of world.
</TD></TR></TABLE>
Ignorance is bliss. Tuners aren't magicians. If the engine detonates because you have 12:1 compression and 30psi on 91 octane there's not a damn thing you can do about it. If the setup is wrong, there's nothing the tuner can do to make it right, you can only make the best of a situation.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....
11-22-2006, 09:18 PM
#33
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Re: (tony1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 »</TD></TR><TR><TD CLASS="quote">Ignorance is bliss. Tuners aren't magicians. If the engine detonates because you have 12:1 compression and 30psi on 91 octane there's not a damn thing you can do about it. If the setup is wrong, there's nothing the tuner can do to make it right, you can only make the best of a situation.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Ignorance... its your comprehension.
If an engine detonates you found the limit. Use a better fuel.
'' Gasoline is a crappy fuel but tuning and tuner is God in this type of world.''
No way in hell does this mean tuner can make anything happen. Tuner doesnt just mean EMS tuner the person who built the engine should know the limit of how high they can go.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Ignorance... its your comprehension.
If an engine detonates you found the limit. Use a better fuel.
'' Gasoline is a crappy fuel but tuning and tuner is God in this type of world.''
No way in hell does this mean tuner can make anything happen. Tuner doesnt just mean EMS tuner the person who built the engine should know the limit of how high they can go.
11-22-2006, 10:25 PM
#34
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Re: (MidShipCivic)
when the fuel is not a problem design the piston/chamber to make the most efficent combustion... at that point compression dosnt matter all that much
11-23-2006, 02:58 AM
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Re: (tony1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 »</TD></TR><TR><TD CLASS="quote">As for my opinion, pump gas turbo motor, >9:1. </TD></TR></TABLE>
Do you mean less than 9:1?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 »</TD></TR><TR><TD CLASS="quote">For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Curious, why did you choose 9:1 and not higher with C16? Did you find it made more power with less compression and more boost, even on C16?
Do you mean less than 9:1?
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 »</TD></TR><TR><TD CLASS="quote">For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Curious, why did you choose 9:1 and not higher with C16? Did you find it made more power with less compression and more boost, even on C16?
11-23-2006, 06:09 AM
#36
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Re: (LeGeND4LiFe)
yes, less than 9:1.
I chose 9:1 on my race car. The car has gone 161mph in the 1/4, 2nd fastest in it's class in the world. I built this motor about 5 years ago, and it's still running. I'd say something in the combination is working pretty good.
I chose 9:1 on my race car. The car has gone 161mph in the 1/4, 2nd fastest in it's class in the world. I built this motor about 5 years ago, and it's still running. I'd say something in the combination is working pretty good.
11-23-2006, 07:13 AM
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Re: (tony1)
I don't know why people think there is a one size fits all specific answer. The answer is simple, you want the highest compression possible which still leaves a margin of error as far as gasoline limitations are concerned. Meaning if you are building a race car and can run c16 at best, runnning 13:1 compression would be a terrible combination because you will reach the knock limit before your desired power level. If someone was building a nice little street car with a goal of 350whp, it would be retarded to run 7's or 8's compression when you can easily run 10's, make more torque, and still be very safe.
11-23-2006, 07:35 AM
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Way back in the day the turbo Porsches ran as low as 6.5:1. They made of 700Hp for 24hours at a stretch, at WOT. It was aircooled though.
If you are building a engine you are driving everday, back and forth to work, I prefer to run a little more compression to make off boost driving a little more efficent. You can run 9.5 without any issues and still run 20+ of boost on a street engine setup. The GT2 runs 9.4:1 and can make sustained top end high speed runs without concerns for durability. Many of our engines would melt down. Not all but many of them.
Design the engine for your situation.
If you are building a engine you are driving everday, back and forth to work, I prefer to run a little more compression to make off boost driving a little more efficent. You can run 9.5 without any issues and still run 20+ of boost on a street engine setup. The GT2 runs 9.4:1 and can make sustained top end high speed runs without concerns for durability. Many of our engines would melt down. Not all but many of them.
Design the engine for your situation.
11-23-2006, 07:49 AM
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Re: (tony1)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 »</TD></TR><TR><TD CLASS="quote">
Ignorance is bliss. Tuners aren't magicians. If the engine detonates because you have 12:1 compression and 30psi on 91 octane there's not a damn thing you can do about it. If the setup is wrong, there's nothing the tuner can do to make it right, you can only make the best of a situation.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Couldnt have said it better. My personal motor ended up at 9.5:1. Has alot (10,000) of hard miles on it and is still running to this day. I have tuned turbo motors from 8.8:1 - 12.5:1. Maybe it was the setups but I liked the around 9:1 cars the most
Ignorance is bliss. Tuners aren't magicians. If the engine detonates because you have 12:1 compression and 30psi on 91 octane there's not a damn thing you can do about it. If the setup is wrong, there's nothing the tuner can do to make it right, you can only make the best of a situation.
As for my opinion, pump gas turbo motor, >9:1. You have to look at how much boost you can make with the given turbo setup, look at the fuel you're running, and then choose your compression last. An 8:1 motor that can run 30psi on pump gas doesn't do you any good if your turbo will only make 15psi. For what it's worth, i run 9ish:1 compression and C16....</TD></TR></TABLE>
Couldnt have said it better. My personal motor ended up at 9.5:1. Has alot (10,000) of hard miles on it and is still running to this day. I have tuned turbo motors from 8.8:1 - 12.5:1. Maybe it was the setups but I liked the around 9:1 cars the most
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