boosted 427 lsx compression ratio build - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

on3wego · 08-21-2014, 05:06 PM

Looking to see what others are doing with there compression ratios. And there forced induction setups. I'v read on forums and other sites.. I do know it will vary on setup and use of the car.

So question is.. higher compression and lower boost of higher boost and lower compression? ?

Reason I ask this is bc I'v read like 10.1- 10.8 and less boost is more responsive and more torque. Better for the street.. yes it shortens window for tuning.. but running 91 and torco..for jow.. and will be doing e85. Very soon.. also read the response of the turbos is more responsive. Great for street

And the higher boost and lower compression.. 9.1-9.5... can do more boost and makes more peak power.

If I have this wrong please lmk.. I don't see the problem with running little higher compression and lower boost to make the same power. Running a lsx. Especially on e85.. or am I missing somthing here??

If yal can post yals reasons and builds. Lmk.. learning process.. and wondering if my setup should be changed to higher compression

Also note.. this is not a drag car. Will be daily driven and roll raced. Idc about peak hp.. I want a good strong pull. And little lag as possible.

Thanks guys

sprayedv · 08-21-2014, 05:41 PM

Lower compression more boost if you have E85 or VP available.

If you're going to use torco...lol... just boost single digits.

H-E · 08-21-2014, 06:06 PM

Cr is king, this isn't the 80s..With e85 you could easily run 11 to 1 for most builds.

Unreal · 08-21-2014, 06:23 PM

I would do 10.4-10.5 if it was me. Plenty of room for pump gas tuning while not being lazy.

10aSSee D · 08-21-2014, 07:01 PM

Andy kept mine at 9.5:1 because I will always be on pump gas. I'm sure we could have got away with more compression but I left it up to him.

BullF-16 · 08-21-2014, 07:41 PM

Quote:

Originally Posted by sprayedv

Lower compression more boost if you have E85 or VP available.

If you're going to use torco...lol... just boost single digits.

LOL Torco has treated me pretty damn well. We dont all have access to E85 which is more inconsistent than blending torco imo.

I elected to go middle of the road at 9.5 CR and boost up to 25psi and it worked well. I also run 93 blended with Torco for 96 octane. Also dual meth nozzles. My tuner liked the setup and it did and has done very well so far.

SuperchargedStealth · 08-21-2014, 09:10 PM

I'm at 9.6:1. At 100% boost, I run 23lbs. of boost, but that's with race gas blend. When I'm running just off the wastegate, I'm at 14lbs. of boost with pump gas. All this with a centrifugal blower. With lower boost, it makes it more streetable. It doesn't pull as hard, but it still has power behind it.

2ss-booya · 08-21-2014, 09:34 PM

Quote:

Originally Posted by on3wego

Looking to see what others are doing with there compression ratios. And there forced induction setups. I'v read on forums and other sites.. I do know it will vary on setup and use of the car.

So question is.. higher compression and lower boost of higher boost and lower compression? ?

Reason I ask this is bc I'v read like 10.1- 10.8 and less boost is more responsive and more torque. Better for the street.. yes it shortens window for tuning.. but running 91 and torco..for jow.. and will be doing e85. Very soon.. also read the response of the turbos is more responsive. Great for street

And the higher boost and lower compression.. 9.1-9.5... can do more boost and makes more peak power.

If I have this wrong please lmk.. I don't see the problem with running little higher compression and lower boost to make the same power. Running a lsx. Especially on e85.. or am I missing somthing here??

If yal can post yals reasons and builds. Lmk.. learning process.. and wondering if my setup should be changed to higher compression

Also note.. this is not a drag car. Will be daily driven and roll raced. Idc about peak hp.. I want a good strong pull. And little lag as possible.

Thanks guys

lol Oh really? You don't care about peak hp?

on3wego · 08-21-2014, 11:20 PM

Quote:

Originally Posted by 2ss-booya

lol Oh really? You don't care about peak hp?

Not as much as I do the power curve. Yes don't get me wrong. Love to be in the 4 digits. But if it is more responsive and pulls hard at a lower rpm and pulls all way through shift point. Will be perfect.

Like stated this is street car. Not drag car.

My key points. Responsiveness. Little to no boost lag. And good over all power. Pulls hard.

on3wego · 08-22-2014, 12:25 AM

Is there that much difference in low vs high compression on boost applications? ?

SuperchargedStealth · 08-22-2014, 12:34 AM

Low compression can offer a wider variety of boost ranges. Whereas hIgh compression, you're limited to what you can have. So if or example you have low boost on a high compression build, you can only do so much and vice versa with low compression and high boost.

on3wego · 08-22-2014, 12:45 AM

That makes sense just looking for real world experience to talk to. And what would be best for me.

SuperchargedStealth · 08-22-2014, 12:54 AM

Standard turbo setups. and centri blowers, will typically have lag up to about 2500, so from idle and up, it'll feel like stock.There are turbos that keep from getting lag, but they are more pricey. So the only blowers that will give you that instant response is a Maggie, Whipple, Edelbrock....anything top mouted. Streetability, is all depend on your right foot.

sprayedv · 08-22-2014, 01:21 AM

10:2 comp running 28lbs on twins 6766s on e85 or c16.

08-21-2014, 05:06 PM	#1
on3wego Drives: 2014 zl1 triple black Join Date: May 2014 Location: Oklahoma Posts: 439	boosted 427 lsx compression ratio build Looking to see what others are doing with there compression ratios. And there forced induction setups. I'v read on forums and other sites.. I do know it will vary on setup and use of the car. So question is.. higher compression and lower boost of higher boost and lower compression? ? Reason I ask this is bc I'v read like 10.1- 10.8 and less boost is more responsive and more torque. Better for the street.. yes it shortens window for tuning.. but running 91 and torco..for jow.. and will be doing e85. Very soon.. also read the response of the turbos is more responsive. Great for street And the higher boost and lower compression.. 9.1-9.5... can do more boost and makes more peak power. If I have this wrong please lmk.. I don't see the problem with running little higher compression and lower boost to make the same power. Running a lsx. Especially on e85.. or am I missing somthing here?? If yal can post yals reasons and builds. Lmk.. learning process.. and wondering if my setup should be changed to higher compression Also note.. this is not a drag car. Will be daily driven and roll raced. Idc about peak hp.. I want a good strong pull. And little lag as possible. Thanks guys __________________ Mods to be updated soon

08-21-2014, 05:41 PM	#2
sprayedv Drives: 2012 CTS-V, 2010 Camaro SS Join Date: Sep 2013 Location: Infront of you Posts: 281	Lower compression more boost if you have E85 or VP available. If you're going to use torco...lol... just boost single digits. __________________ 2012 CTS-V: Cosmetic Chute.

08-21-2014, 06:23 PM	#4
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	I would do 10.4-10.5 if it was me. Plenty of room for pump gas tuning while not being lazy. __________________ Nick Corvette Z06 -1200ish rwhp

08-21-2014, 07:01 PM	#5
10aSSee D Drives: Silver 2010 SS Camaro Join Date: Jul 2009 Location: TN Posts: 2,562	Andy kept mine at 9.5:1 because I will always be on pump gas. I'm sure we could have got away with more compression but I left it up to him. __________________ MODS: ADM built 417, 2.9L Whipple with 3.250 pulley, ADM ported and polished LSA heads,ADM stage3 cam,ADM LSA belt drive system,ADM CAI race scoop, ADM dual fuel pumps, ID 850's, BMR full suspension, Gforce 9 inch kit with 3.5 inch driveshaft, Street Slayer twin carbon clutch, Lingenfelter oil seperator. Tuned by built by ADM Performance, 763rwhp,705rwtq

08-21-2014, 09:10 PM	#7
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	I'm at 9.6:1. At 100% boost, I run 23lbs. of boost, but that's with race gas blend. When I'm running just off the wastegate, I'm at 14lbs. of boost with pump gas. All this with a centrifugal blower. With lower boost, it makes it more streetable. It doesn't pull as hard, but it still has power behind it. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

08-21-2014, 06:06 PM	#3
H-E Account Suspended Drives: 2010 zr1 Camaro 2011 vert Join Date: Apr 2013 Location: everywhere Posts: 1,121	Cr is king, this isn't the 80s..With e85 you could easily run 11 to 1 for most builds.

08-22-2014, 12:25 AM	#10
on3wego Drives: 2014 zl1 triple black Join Date: May 2014 Location: Oklahoma Posts: 439	Is there that much difference in low vs high compression on boost applications? ? __________________ Mods to be updated soon

08-22-2014, 12:34 AM	#11
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	Low compression can offer a wider variety of boost ranges. Whereas hIgh compression, you're limited to what you can have. So if or example you have low boost on a high compression build, you can only do so much and vice versa with low compression and high boost. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

08-22-2014, 12:45 AM	#12
on3wego Drives: 2014 zl1 triple black Join Date: May 2014 Location: Oklahoma Posts: 439	That makes sense just looking for real world experience to talk to. And what would be best for me. __________________ Mods to be updated soon

08-22-2014, 12:54 AM	#13
SuperchargedStealth Drives: '11 Camaro Supercharged Convertible Join Date: May 2014 Location: NJ Posts: 481	Standard turbo setups. and centri blowers, will typically have lag up to about 2500, so from idle and up, it'll feel like stock.There are turbos that keep from getting lag, but they are more pricey. So the only blowers that will give you that instant response is a Maggie, Whipple, Edelbrock....anything top mouted. Streetability, is all depend on your right foot. __________________ 2011 Triple Black SS convertible, LSX 427, PRC 260cc heads, Callies Ultra Billet Rods, Wiseco -20 cc piston, Callies Dragon Slayer crank, Strange Dana 60 rear w/3.73 gear ratio and driveshaft, Pfadt coilovers, Pfadt sway bars, Pfadt trailing arms, Pfadt tie rods, Pfadt subframe bushings, Vortech YSi with wastegate and twin BOV, Haltech ECU, Mantic 9000 Twin Clutch, ALKY control meth system with dual nozzle, Squash twin fuel pumps, ACS T3 ports, VIS Terminator Hood, Seibon ZL style lip.

08-22-2014, 01:21 AM	#14
sprayedv Drives: 2012 CTS-V, 2010 Camaro SS Join Date: Sep 2013 Location: Infront of you Posts: 281	10:2 comp running 28lbs on twins 6766s on e85 or c16. __________________ 2012 CTS-V: Cosmetic Chute.