Low compression piston recommendation - Dodge SRT Forum
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post #1 of 45 (permalink) Old 12-07-2012, 06:16 PM Thread Starter
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Low compression piston recommendation

hey guys im currently in the process of gathering up parts for my new big bore low compression build. I already have the rods that i want in mind (eagle due to weight) and was wondering what manufacture and vendor you guys think offers the best piston design??

I plan on running big boost with 94 and meth and more timing then i run now (28deg @25psi)

It would be nice if i could grab whole kit from a vendor.
I have emailed 3 vendors and so far no reply back and its been over a week

Thanks boys

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post #2 of 45 (permalink) Old 12-07-2012, 06:31 PM
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what fuel are you running?
i'm very happy with 8.8:1 and e85

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post #3 of 45 (permalink) Old 12-07-2012, 06:35 PM
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Quote:
Originally Posted by fixit View Post
what fuel are you running?
i'm very happy with 8.8:1 and e85
im looking to do the same piston. Just worried about winter and running 93

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post #4 of 45 (permalink) Old 12-07-2012, 06:37 PM
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You said low compression. How low are you talking?
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post #5 of 45 (permalink) Old 12-07-2012, 06:43 PM
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lots of opinions on this topic..
personally i go with the math (just a few builds under my belt )
search the build section for 8.8:1 e85 s3+ builds.. lots of happy customers

it all comes down to how much air and fuel/octane and temperature of the combustion Chambers ..

spend some time searching around
What You Need to Know About E85 Ethanol Alternative Fuel - Hot Rod Magazine

Quote:
Originally Posted by Ridin59vette View Post
im looking to do the same piston. Just worried about winter and running 93

SCH-I510 using AutoGuide.C

Build Thread:http://www.srtforums.com/forums/f451...w-123k-612933/
PCM=S0, DSP rescaled, 3bar map/tip
injectors= Siemens 80# (ebay $200)
built motor, 8.8:1 weisco, eagle-h, strap & windage
S3R DCR manifold ($500) w/evo8 turbo (ebay $150) - 20G/47# ebay ($200)
Evo 8 WGA
24x12x4 w/cast ends - CXRacing (ebay $200)
DataLogger DataQA, $25
Wideband UEGO (ebay $150)
vette rims 275/40/17
needswing v5
SouthBend S3
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post #6 of 45 (permalink) Old 12-07-2012, 07:09 PM Thread Starter
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94 octane and 100% meth. No e85 around here



AGP Twinscroll s256
+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #7 of 45 (permalink) Old 12-07-2012, 07:10 PM Thread Starter
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94 octane and 100% meth. No e85 around here.

I wanna do 7.2 to 1



AGP Twinscroll s256
+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #8 of 45 (permalink) Old 12-07-2012, 07:12 PM Thread Starter
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Quote:
Originally Posted by tunerlover3 View Post
You said low compression. How low are you talking?
7.2-1



AGP Twinscroll s256
+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #9 of 45 (permalink) Old 12-07-2012, 08:50 PM
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do you plan on running 60psi of boost ??? if your running meth and 94 i would suggest at least 9.0:1 comp what turbo r u gong to be running, manifolds, cams,ported head?
not to mention you can only add in so much timing befor you get no gains from it and at 28*is about where im at on stock comp and e85 before the built block
im currently in the processes of building a 10.0:1 comp 30+psi of boost monster that will eat e85

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TIRED OF YOUR EGO HARD DATA IS MORE IMPORTANT AND USEFUL TO OTHERS SEEKING KNOWLEDGE AND THOES WANTING TO ADVANCE THE PLATFORM
DONT GET STUCK ON PRECISION TURBOS AND BWS THEY ARE NOT THE END ALL........ OTHER GREAT OPTIONS EXIST DO SOME RESEARCH DON'T BE A SHEEP

Last edited by loroku; 12-07-2012 at 09:06 PM.
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post #10 of 45 (permalink) Old 12-07-2012, 10:37 PM Thread Starter
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30 psi
I already have the top end really built

I pretty much get knock around 24 psi



AGP Twinscroll s256
+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #11 of 45 (permalink) Old 12-07-2012, 11:05 PM
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Work on the tune more..
I've ran 27psi on 91oct and 1 m5 nozzle 50%meth/50%water on a 58mm turbo.

And any reason 7".2" vs that of 7.0 or 7.5? lol

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post #12 of 45 (permalink) Old 12-07-2012, 11:22 PM Thread Starter
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Quote:
Originally Posted by D-SRT View Post
Work on the tune more..
I've ran 27psi on 91oct and 1 m5 nozzle 50%meth/50%water on a 58mm turbo.

And any reason 7".2" vs that of 7.0 or 7.5? lol
what kind of timing were u running thou?

7.2 so it gives me room for high boost high timing.

AGP Twinscroll s256
+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #13 of 45 (permalink) Old 12-08-2012, 02:39 AM
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dude its all in the tune man i bet you have too much timing or not enough meth/water
is it knock or preignition?

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TIRED OF YOUR EGO HARD DATA IS MORE IMPORTANT AND USEFUL TO OTHERS SEEKING KNOWLEDGE AND THOES WANTING TO ADVANCE THE PLATFORM
DONT GET STUCK ON PRECISION TURBOS AND BWS THEY ARE NOT THE END ALL........ OTHER GREAT OPTIONS EXIST DO SOME RESEARCH DON'T BE A SHEEP
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post #14 of 45 (permalink) Old 12-08-2012, 11:35 AM Thread Starter
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Quote:
Originally Posted by loroku View Post
dude its all in the tune man i bet you have too much timing or not enough meth/water
is it knock or preignition?
im running an m10 nozzle spraying 80% meth... thats alot of meth.

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+1 Race head, Race ported IM
BC 2 cams
Built Motor
Meth Injection
11.4@125mph (old times,S3, stock head and cams) 26psi)
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post #15 of 45 (permalink) Old 12-08-2012, 03:29 PM
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There is no reason to go that low in compression, have a good tuner tune the car and won't have issues.

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