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Old 08-27-2013, 11:29 AM   #1
Twin2010
 
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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.
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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
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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.
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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
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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
TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF
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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....
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Old 08-27-2013, 04:38 PM   #10
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10.4:1 on 93 octane and meth
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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.
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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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