Low compression piston recommendation - SRT Forums

Turbolag87 · 12-07-2012, 05:16 PM

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

fixit · 12-07-2012, 05:31 PM

what fuel are you running?
i'm very happy with 8.8:1 and e85

Ridin59vette · 12-07-2012, 05:35 PM

Quote: Originally Posted by fixit

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

SCH-I510 using AutoGuide.C

tunerlover3 · 12-07-2012, 05:37 PM

You said low compression. How low are you talking?

fixit · 12-07-2012, 05:43 PM

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

im looking to do the same piston. Just worried about winter and running 93

SCH-I510 using AutoGuide.C

Turbolag87 · 12-07-2012, 06:09 PM

94 octane and 100% meth. No e85 around here

Turbolag87 · 12-07-2012, 06:10 PM

94 octane and 100% meth. No e85 around here.

I wanna do 7.2 to 1

Turbolag87 · 12-07-2012, 06:12 PM

Quote: Originally Posted by tunerlover3

You said low compression. How low are you talking?

7.2-1

loroku · 12-07-2012, 07:50 PM

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

Turbolag87 · 12-07-2012, 09:37 PM

30 psi
I already have the top end really built

I pretty much get knock around 24 psi

D-SRT · 12-07-2012, 10:05 PM

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

Turbolag87 · 12-07-2012, 10:22 PM

Quote: Originally Posted by D-SRT

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.

loroku · 12-08-2012, 01:39 AM

dude its all in the tune man i bet you have too much timing or not enough meth/water
is it knock or preignition?

Turbolag87 · 12-08-2012, 10:35 AM

Quote: Originally Posted by loroku

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.

boots · 12-08-2012, 02:29 PM

There is no reason to go that low in compression, have a good tuner tune the car and won't have issues.

12-07-2012, 05:16 PM	#1 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	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 __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-07-2012, 05:31 PM	#2 (permalink)
fixit SRTforums Member Join Date: May 2004 Member Number: 11361 Location: nj Posts: 1,488	what fuel are you running? i'm very happy with 8.8:1 and e85 __________________ 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

12-07-2012, 05:35 PM	#3 (permalink)
Ridin59vette SRTforums Member Join Date: Sep 2011 Member Number: 86347 Location: Albany Posts: 1,144	Quote: Originally Posted by fixit 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 SCH-I510 using AutoGuide.C __________________ 04 SRT-4: Under Construction 99 9-3: Daily Driver FS Thread: http://www.srtforums.com/forums/f416...5/#post9777568

12-07-2012, 05:37 PM	#4 (permalink)
tunerlover3 Fresh Meat Moderator Join Date: Dec 2009 Member Number: 76568 Location: Chicago Posts: 16,633	You said low compression. How low are you talking? __________________ Diablo CMR tuner ~Dan~ 2004 Black Neon SRT4: E85 stock turbo SOLD 310HP 436TQ 2004 Eblue Neon SRT4: E85 5558 Built motor XXXHP XXXTQ

12-07-2012, 05:43 PM	#5 (permalink)
fixit SRTforums Member Join Date: May 2004 Member Number: 11361 Location: nj Posts: 1,488	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 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

12-07-2012, 06:09 PM	#6 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	94 octane and 100% meth. No e85 around here __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-07-2012, 06:10 PM	#7 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	94 octane and 100% meth. No e85 around here. I wanna do 7.2 to 1 __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-07-2012, 06:12 PM	#8 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	Quote: Originally Posted by tunerlover3 You said low compression. How low are you talking? 7.2-1 __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-07-2012, 07:50 PM	#9 (permalink)
loroku SRTforums Member Join Date: Aug 2010 Member Number: 80621 Location: janesville wi Posts: 296	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 28is 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 __________________ Sold My Soul for a Neon pm me for all your HID retrofit needs 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 08:06 PM.

12-07-2012, 09:37 PM	#10 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	30 psi I already have the top end really built I pretty much get knock around 24 psi __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-07-2012, 10:05 PM	#11 (permalink)
D-SRT SRTforums Member Join Date: Aug 2010 Member Number: 80561 Location: monterey Posts: 709	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 __________________ Pumpking. 10.31@147. 1st SRT in TENS in CA. QUICKEST & FASTEST IN CA. Thanks to: TUNED BY MINDMELT101@DRAG-ON Tuning. - http://drag-ontuning.com/blog/ GOKEY RACING for anything fabrication related Instagram: m_santiago37

12-07-2012, 10:22 PM	#12 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	Quote: Originally Posted by D-SRT 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. __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-08-2012, 01:39 AM	#13 (permalink)
loroku SRTforums Member Join Date: Aug 2010 Member Number: 80621 Location: janesville wi Posts: 296	dude its all in the tune man i bet you have too much timing or not enough meth/water is it knock or preignition? __________________ Sold My Soul for a Neon pm me for all your HID retrofit needs *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

12-08-2012, 10:35 AM	#14 (permalink)
Turbolag87 SRTforums Member Join Date: Dec 2003 Member Number: 6491 Location: Pickering, Onta Posts: 5,591	Quote: Originally Posted by loroku 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. __________________ F&F Stage III 47lb turbo +1 Race head, Race ported IM BC 2 cams Ext WGA Meth Injection 11.4@125mph (old times, stock head and cams) 26psi

12-08-2012, 02:29 PM	#15 (permalink)
boots SRTforums Member Join Date: Aug 2008 Member Number: 67116 Location: Zanesville, OH Posts: 2,877	There is no reason to go that low in compression, have a good tuner tune the car and won't have issues. __________________ srt powered 1st gen 615hp@13psi through a DCR auto 9.87@153 first full pass

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