What compression ratio for agp twins - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

_Onyx_Wolf_ · 04-01-2021, 06:57 PM

Having a 427 dart eliminator block built by tms and wanna to know what the agp twin kit guys are running for comp ratio. End whp goal is 1200, 93 octane only with possibility of meth and will mostly be a streetcar.

dreksnot · 04-01-2021, 08:01 PM

11:1
wanted the car to not be a dog on the street for daily but still be able to lay the boost into it at the races

eLeSthree · 04-01-2021, 09:41 PM

93 only, i’d probably go lower. Im at 10.3 and its got plenty of grunt off boost. I woul just talk to Dustin or one of the guys there and get their recommendation.

_Onyx_Wolf_ · 04-02-2021, 12:27 PM

Kevin at tms recommended 9 something compression ratio, just wanted to see what others were running. Any recommendations on a good sealing head gasket? 4.125 bore with arp regular sized studs 6 bolt head setup.

dreksnot · 04-02-2021, 12:29 PM

I've hear opposing arguments about choosing CR with boost. Some say go low CR so you can crank up the boost with more "margin." Others say high CR will give you more power, but you have to be conservative with the timing. Perhaps it all depends on how one wants to use the car. Either way when done correctly won't be wrong, IMO.

G8One2 · 04-02-2021, 01:39 PM

Static CR really doesnt mean much. Valve events dictate your effective (Dynamic Compression) in a more meaningful number. If you dont know what it is, its kind of a crap shoot on what CR to run. The higher the better for off boost, but too high will limit how much boosts you can run. I think 8.0:1 DCR is kind of a sweet spot for boosted applications, but thats just my opinion. It really kind of varies depending on build. Every car is different.

Rem0v3r · 04-03-2021, 09:19 AM

Just put it on E. you've got thousands into your build, dont risk it running shitty gas.

gunchamp · 04-03-2021, 12:41 PM

Im at 11:1 and will be running 10lbs on 93 to start. May switch to E depending

_Onyx_Wolf_ · 04-04-2021, 07:46 AM

Quote:

Originally Posted by Rem0v3r

Just put it on E. you've got thousands into your build, dont risk it running shitty gas.

None in my area

_Onyx_Wolf_ · 04-16-2021, 06:07 PM

Going with a 9.5:1 compression ratio and rings gapped for boost.

Badbubba · 04-16-2021, 09:08 PM

11:1 seems high to me, just saying.

ttshovel · 04-17-2021, 09:18 AM

Quote:

Originally Posted by Badbubba

11:1 seems high to me, just saying.

Thats not far off factory compression. Compression is free power. It's not 1980 anymore.

Thats just static compression, dynamic is something completely different

stevieturbo · 04-17-2021, 02:03 PM

Quote:

Originally Posted by _Onyx_Wolf_

Kevin at tms recommended 9 something compression ratio, just wanted to see what others were running. Any recommendations on a good sealing head gasket? 4.125 bore with arp regular sized studs 6 bolt head setup.

93 only, I'd definitely be into the 9's

Adding more boost is easy to make power.

When you're knock limited through fuel/too high CR....there is no fix when on pump fuel only.

And a 427 is never going to be a dog off boost.

gunchamp · 04-17-2021, 04:24 PM

Quote:

Originally Posted by ttshovel

Thats not far off factory compression. Compression is free power. It's not 1980 anymore.

Thats just static compression, dynamic is something completely different

This, its all in the tune. Its not old school anymore. Lots of cars running relatively high compression with boost

04-01-2021, 06:57 PM	#1
_Onyx_Wolf_ Onyx_Z7 <— Instagram Drives: 2013 2ss 1le Join Date: Aug 2014 Location: Delaware Posts: 634	What compression ratio for agp twins Having a 427 dart eliminator block built by tms and wanna to know what the agp twin kit guys are running for comp ratio. End whp goal is 1200, 93 octane only with possibility of meth and will mostly be a streetcar.

04-01-2021, 08:01 PM	#2
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,603 View My Garage	11:1 wanted the car to not be a dog on the street for daily but still be able to lay the boost into it at the races __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

04-01-2021, 09:41 PM	#3
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,904	93 only, i’d probably go lower. Im at 10.3 and its got plenty of grunt off boost. I woul just talk to Dustin or one of the guys there and get their recommendation. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

04-02-2021, 12:29 PM	#5
dreksnot Served USN - Atomic Chimp Drives: 13 Camaro LSX434 TT M6, 21 ZLE A10 Join Date: Jul 2012 Location: Fort Collins, CO Posts: 1,603 View My Garage	I've hear opposing arguments about choosing CR with boost. Some say go low CR so you can crank up the boost with more "margin." Others say high CR will give you more power, but you have to be conservative with the timing. Perhaps it all depends on how one wants to use the car. Either way when done correctly won't be wrong, IMO. __________________ In excess of 1,000WHP LSX434 \| AGP 65/65 TT \| BTR Equalizer Intake \| Trickflow 245cc cathedral \| BTR custom cam \| Cortex EBC \| n2mb WOT \| ID-1700x \| Brisk GR12S \| RPM Lv 7 TR6060 \| AGP's Triple 525LPH Fore Fuel \| Monster LT1-S Triple \| 4.11 DSS Proform 9", CF driveshaft, 1400hp axles \| Hurst Line Lock \| MGW Retro Short Throw w/old skool Hurst T-handle \| ADM solid subframe mounts \| Prothane Motor Mounts \| Revshift Poly Trans insert \| Moreno camber/caster plates

04-03-2021, 12:41 PM	#8
gunchamp Drives: 15 Camaro SS Join Date: Oct 2018 Location: Mountains of central PA Posts: 1,442	Im at 11:1 and will be running 10lbs on 93 to start. May switch to E depending __________________ 15 Camaro SS- GPI max top end, ESS Vortech V3 9psi, ID 1050s, ZL1 pump, JMS bap, Long tubes, Corsa extreme, Circle D pro 5C, 391 rear, DSS carbon drive shaft, poly cradle bushings, tuned by Ted Jannetty and much much more

04-02-2021, 12:27 PM	#4
_Onyx_Wolf_ Onyx_Z7 <— Instagram Drives: 2013 2ss 1le Join Date: Aug 2014 Location: Delaware Posts: 634	Kevin at tms recommended 9 something compression ratio, just wanted to see what others were running. Any recommendations on a good sealing head gasket? 4.125 bore with arp regular sized studs 6 bolt head setup.

04-02-2021, 01:39 PM	#6
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	Static CR really doesnt mean much. Valve events dictate your effective (Dynamic Compression) in a more meaningful number. If you dont know what it is, its kind of a crap shoot on what CR to run. The higher the better for off boost, but too high will limit how much boosts you can run. I think 8.0:1 DCR is kind of a sweet spot for boosted applications, but thats just my opinion. It really kind of varies depending on build. Every car is different.

04-03-2021, 09:19 AM	#7
Rem0v3r Drives: 2013 ss2 vert l99 Join Date: Apr 2017 Location: South florida Posts: 150	Just put it on E. you've got thousands into your build, dont risk it running shitty gas.

04-16-2021, 06:07 PM	#10
_Onyx_Wolf_ Onyx_Z7 <— Instagram Drives: 2013 2ss 1le Join Date: Aug 2014 Location: Delaware Posts: 634	Going with a 9.5:1 compression ratio and rings gapped for boost.

04-16-2021, 09:08 PM	#11
Badbubba GrINned & JUICEd Drives: 15STI, 10Expy, 10 2SS/RS M6, 47KB1 Join Date: Nov 2009 Location: Pittsburgh, PA Posts: 1,247	11:1 seems high to me, just saying. __________________ GPI SS3 Cam & stuff,N.O. Plate(dedicated fuel tank,progressive,fuel hose upgrade,remote opener,heater,console switches),LNC2000,CTAP,ARH 1 7/8" LTs/gutted cats/X pipe/mufflers,Jet Hot coated LTs,GPI HPT Tune,CAI, Scoop,Rx Catch Can,Gates heater hose relocation, Remote clutch & auto brake res,Metco loop,Momentum Tunnel Brace,TSW Nurb 18",555 & 05,Pfadt trailing arms & toe rods,Autometer WB,Fesler Pillar Pod,LED strips (int),Lloyds floor & trunk mats,LED DRL/front turn & license plate,DRL harness,VLEDs tail lights,Plasticoat Bowties. Ord: Oct 5, 2009 Rec: Nov 19, 2009 13.17@112.6 stock