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Old 08-27-2013, 11:29 AM   #1
Drives: 2010 twin turbo ss
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What compression ratio is everyone running on built boosted motors?

Built for pump gas
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Old 08-27-2013, 11:48 AM   #2

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After i am done with my build. i will be right around 9.7:1 CR.

Yes the more you lower CR, the safer you are running more boost. But that also has the reverse affect that the car looses power when not in boost. So race application you can go lower, but being a street car that i most likely will DD. Its good to have slightly higher compression.

When i am done i will be running around 14-16psi on the street and 18-20psi @ the track. Should be fun to say the least.
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Old 08-27-2013, 12:15 PM   #3

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9:1 here, but my motor is purpose built for racing, not a street driver at all.
I Ain't About That Stock Life.

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Old 08-27-2013, 12:28 PM   #4
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Im at about 9.4:1 with -23cc Wiseco coated blower pistons. At least the CR i calculated to to be with 70cc chambers. I run Torco Accelerator blended with 93 octane for an in tank octane of about 95-96 octane plus the meth during summer. Car was tuned with meth turned off.

Im only 14psi now on my little D1SC but am about to pull the trigger on twin PTE6766 turbos running up the boost to 18 or so and a little over 1000rwhp.

Just a street car that was built to run down ZO6s and ZR1s on the road course a couple times a year
HKE LSX427(Mast blk lbl 305 6bolt LS7heads, PatG231/246 blower cam, RWHP/TQ: 1281/1133 SNL Performance Custom Twin PT6766 BB turbos 4 to 25psi selectable on the Boost Leash controller, Squash dual 400LPH/ID2000s, ALKY 4 gal meth, Autometer AFR/Bst/oilpres/oiltemp/fuelpress gauges, Pedders Justice road crs pkg: All HD bushes, supercar 12kg coil overs, supercar ZL1 sways, camber plates all setup by JusticePete! :Gforce 9" 35spline S-Trac, 1500hp Outlaw axles, 3.5"alum DS, Monster Triple disc; 4xForgeline 19x10.5 4xBridgestone 305/30R19 RE-11, CTS-v calipers/rotors/Cobalt friction XR1/3 pads
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Old 08-27-2013, 01:05 PM   #5

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9.7:1 but if I could go back I would do 10:1.
Corvette Z06 -1200ish rwhp
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Old 08-27-2013, 03:33 PM   #6
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How much boost are you going to run? What octane fuel? Using meth?
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Old 08-27-2013, 03:56 PM   #7
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9:1 only at 12lb of boost will go for 18lb soon
Best @ 586/525 =10.41 @ 133
AS OF 12/13/14>633 RWHP =10.22@135
AS OF 1/31/15 @ 633 RWHP=10.16@135
AS OF 1/29/16 @ 633 RWHP=10.10@136
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Old 08-27-2013, 04:09 PM   #8

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10.2:1 If I recall...

93 octane and meth, 22#
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Old 08-27-2013, 04:26 PM   #9
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9.7:1 for pump gas at 12 lbs on the street with 97 octane... With 429 CI, this is good for right at 900 RWHP

Racing we bump the boost to 25 lbs and run C16 race fuel... in the tank and to mix with the nitrous...With the 429 CI, this makes for a hell of a lot more power....
If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley

Horsepower is how fast you hit the wall.
Torque is how far you take the wall with you.

If everything seems under control, you're just not going fast enough. Mario Andretti

If you can turn, you ain't going fast enough...
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Old 08-27-2013, 04:38 PM   #10
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10.4:1 on 93 octane and meth
2010 Camaro 2SS/RS IOM - 1,023 RWHP 813RWTQ (Paxton Record Holder: 9.82@139)
Built and Tuned by Heintz Racing
Go: DSS 9", RPM Level X 4L65E, Carlyle Racing 15" Conversion, ECS Vortech YSI-B, Squash Fuel, ID1700, Gall Racing 427 C.I LSX, Mast 285CC Heads, HR Custom Cam

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Old 08-27-2013, 04:55 PM   #11
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10.1:1 ... Which was recommended by Dustin Whipple to get the best efficiency out of the blower.
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Old 08-27-2013, 06:34 PM   #12
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I will be at 9.5:1 per Andy at ADM running around 13-15psi.

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
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Old 08-27-2013, 06:36 PM   #13
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Between 9.8-10.2 is the best place to be.

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Old 08-27-2013, 06:54 PM   #14
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10/7 on my build waiting on heads to get done with the porting
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