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Old 08-27-2013, 12:29 PM   #1
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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, 12:48 PM   #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, 01:15 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, 01:28 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, 02:05 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, 04:33 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, 04:56 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
Best so far @ 633/544 =10.36 @ 132
AS OF 12/13/14>633 RWHP =10.22@135
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Old 08-27-2013, 05:09 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, 05:26 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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If you can turn, you ain't going fast enough...
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Old 08-27-2013, 05:38 PM   #10
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10.4:1 on 93 octane and meth
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Old 08-27-2013, 05:55 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, 07:34 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, 07:36 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, 07:54 PM   #14
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10/7 on my build waiting on heads to get done with the porting
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Old 08-27-2013, 08:22 PM   #15
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o man, am i gonna be the winner here?

10.7:1

E85+meth
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Old 08-28-2013, 02:11 PM   #16
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10.3 - 15psi - pump gas (93+)
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Old 08-28-2013, 03:49 PM   #17
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9.9 to 1 here. 12 lbs on pump gas
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Old 08-28-2013, 06:16 PM   #18
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Quote:
Originally Posted by realcanuk View Post
9.9 to 1 here. 12 lbs on pump gas
Man that's a lot of torque!!
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Old 08-28-2013, 11:03 PM   #19
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9.7:1 on 91, 11lbs through twins.
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Old 08-28-2013, 11:08 PM   #20
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10.6:1 on 16 lbs peak on meth and pump gas
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Old 08-29-2013, 01:19 AM   #21
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10.1:1
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Old 08-29-2013, 01:36 AM   #22
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It was recommended that I go with a 10:1 minimum with meth for a street/track car. Motors not built yet but it's next on the list.
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Old 08-29-2013, 02:51 AM   #23
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10.0:1 running 91 octane with 9.5 psi, 95 octane 10.5psi & 98 octane 12.5psi, 3 pulleys for all occasions.
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Old 08-29-2013, 08:57 AM   #24
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I'm going to run a 9:3 compression but I'm going to be in the higher hp numbers so I will be relying on boost for most of the power.
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Old 08-29-2013, 12:11 PM   #25
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11-1 for me and I run a Maggie....With our record holding GTO street car were at 10.4-1 runs 8.70s at 4000lbs... It uses a F1R at 24lbs and runs 93 0n the street...The old school guys like low cr,back when we used carbs it was a must but with todays pcm and fuel injection and a good tuner CR is your friend...That's my opion and its worked great for us,im actually nugeing at Farrad to up the CR on there record holding 5th gen ...
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