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Author
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Topic: CR for a boost 4.6
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98 ROUSH
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Member # 10309
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posted
 
 
[ November 29, 2012, 04:16 PM: Message edited by: 98 ROUSH ]
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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Boss 327
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Member # 9143
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posted
What fuel?
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"You'll never truly understand building engines until you can make power N/A. FI overshadows an engines defficiency." Al Papito
Posts: 1789 | From: East Bay | Registered: May 2009
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98 ROUSH
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Member # 10309
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posted
91 pump gas
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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Boss 327
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Member # 9143
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posted
9.0:1
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"You'll never truly understand building engines until you can make power N/A. FI overshadows an engines defficiency." Al Papito
Posts: 1789 | From: East Bay | Registered: May 2009
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racsirx
CAFords OG
Member # 1710
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posted
I like higher compression with lower boost.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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98 ROUSH
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Member # 10309
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posted
I talked to 2 well-known tuners and they both said 8.5:1 cr which I feel it to low for a vortech. I know with a twin screw 8.5:1 cr is perfect CR with that high of boost while MMR said 9.5:1 cr would be good with a built motor. I'm confuse which to go with.
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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racsirx
CAFords OG
Member # 1710
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posted
Well, the higher boost you run, the hotter inlet air temps will be, unless you use meth injection, air to air intercooler, air to water intercooler or NOS to help bring it down, that's why I say run higher compression and low boost. It's all about octane and timing curve to make it work.
[ November 28, 2012, 11:16 AM: Message edited by: racsirx ]
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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FRC_Kid
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Member # 8940
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posted
My cousin (sonic96gt) had this same dilema... He got his rotating assembly from MMR and I believe they decided on a 9-something CR. He has a centrifugal blower as well. Contact him for the entire rundown. My memory is sketch since I'm a pushrod guy.
PM me if you need contact info.
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Pretend Racecar Driver- C5 FRC
Ford, GM, & Dodge is what I'm all about
Posts: 2578 | From: All over the Peninsula | Registered: Feb 2009
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by racsirx:
Well, the higher boost you run, the hotter inlet air temps will be, unless you use meth injection, air to air intercooler, air to water intercooler or NOS to help bring it down, that's why I say run higher compression and low boost. It's all about octane and timing curve to make it work.
Yeah i see what you are saying and i would go this route if we had 93 octane on pump but we have crappy 91 and i dont feel like spending $6.00 a gallon for better fuel everytime i take it for a ride.
Thanks for your input racsirx ![[patriot]](graemlins/patriot.gif)
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by cali95gt:
My cousin (sonic96gt) had this same dilema... He got his rotating assembly from MMR and I believe they decided on a 9-something CR. He has a centrifugal blower as well. Contact him for the entire rundown. My memory is sketch since I'm a pushrod guy.
PM me if you need contact info.
PM sent
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
I've decided to go with a 9.3:1 cr. Any thought on that guys
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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racsirx
CAFords OG
Member # 1710
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posted
Well I dont know 4.6s but this is how I look at it, it all depends on what HP you are trying to make and the limits of your power adder. It would help if you gave more info on your build. I like not too max out my power adder to make my goal, and if the blower setup doesn't make good power on the low end then I would like a high compression motor.
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88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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Boss 327
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Member # 9143
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posted
Ever thought about running E85?
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"You'll never truly understand building engines until you can make power N/A. FI overshadows an engines defficiency." Al Papito
Posts: 1789 | From: East Bay | Registered: May 2009
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98 ROUSH
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Member # 10309
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posted
[ November 29, 2012, 04:17 PM: Message edited by: 98 ROUSH ]
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by Boss 327:
Ever thought about running E85?
91octane for street use and a 100 octane tune for track use
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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SwEeT03Gt
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Member # 10283
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posted
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by Boss 327:
Ever thought about running E85?
91octane for street use and a 100 octane tune for track use
i would look into the e85, my boy all motor built N/A is at 388rwhp/385rwtq on the corn n this is on a 2V
thats on a stock pi intake he just swapped to a typhoon one iirc
you should also pm vortek01gt
[ November 28, 2012, 08:31 PM: Message edited by: SwEeT 03 Gt ]
Posts: 4484 | From: -NicKlE n DiMe- | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by SwEeT 03 Gt:
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by Boss 327:
Ever thought about running E85?
91octane for street use and a 100 octane tune for track use
i would look into the e85, my boy all motor built N/A is at 388rwhp/385rwtq on the corn n this is on a 2V
thats on a stock pi intake he just swapped to a typhoon one iirc
you should also pm vortek01gt
Yeah don't really want to go with e85 but it is an option.
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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NEIGHT
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Member # 8741
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posted
Damn 15-17psi!? You aint playin!
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-Savage Habits-
1992 Summer Edition
1986 Hatch- catfish killer
1964 Impala hard top
Posts: 18548 | From: EA$T $IDE REDWOOD CITY | Registered: Nov 2008
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by NEIGHT:
Damn 15-17psi!? You aint playin!
LoL!
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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SwEeT03Gt
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Member # 10283
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posted
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by SwEeT 03 Gt:
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by Boss 327:
Ever thought about running E85?
91octane for street use and a 100 octane tune for track use
i would look into the e85, my boy all motor built N/A is at 388rwhp/385rwtq on the corn n this is on a 2V
thats on a stock pi intake he just swapped to a typhoon one iirc
you should also pm vortek01gt
Yeah don't really want to go with e85 but it is an option.
its cheaper than regular gas, and rated close to 100 octane and runs way cleaner then gas only down fall is theirs only 2 gas stations in the east bay that has it lol on W. Ast
Posts: 4484 | From: -NicKlE n DiMe- | Registered: Sep 2010
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98 ROUSH
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Member # 10309
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posted
quote:
Originally posted by SwEeT 03 Gt:
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by SwEeT 03 Gt:
quote:
Originally posted by 98 ROUSH:
quote:
Originally posted by Boss 327:
Ever thought about running E85?
91octane for street use and a 100 octane tune for track use
i would look into the e85, my boy all motor built N/A is at 388rwhp/385rwtq on the corn n this is on a 2V
thats on a stock pi intake he just swapped to a typhoon one iirc
you should also pm vortek01gt
Yeah don't really want to go with e85 but it is an option.
its cheaper than regular gas, and rated close to 100 octane and runs way cleaner then gas only down fall is theirs only 2 gas stations in the east bay that has it lol on W. Ast
Ima stay with pump gas just incase I take a long trip and not dealing with if that e85 station closes down
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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racsirx
CAFords OG
Member # 1710
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posted
Crazy thing is boost varies with every setup, the more efficient your motor is, the less boost you will see, for example my built 331 with 6lbs of boost made 566rwhp, that same blower and pulley setup on a stock motor would have made 10lbs of boost. I didn't think you need that much boost to make 500hp at the motor, but if you really want to make a lot boost, I wouldnt get a S-trim, I would look at a Si-trim or T-trim.
--------------------
88 Saleen #564
88 GT 331 NOVI2000
88 Coupe TURBO 9.75@142
95 Cobra R #75-SOLD
06 F250
13 BMW AH3
17 GT350 #5556
GOD'S NOT DEAD
Posts: 20750 | From: Concord & Pittsburg, CA | Registered: Aug 2002
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98 ROUSH
¯
Member # 10309
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posted
quote:
Originally posted by racsirx:
Crazy thing is boost varies with every setup, the more efficient your motor is, the less boost you will see, for example my built 331 with 6lbs of boost made 566rwhp, that same blower and pulley setup on a stock motor would have made 10lbs of boost. I didn't think you need that much boost to make 500hp at the motor, but if you really want to make a lot boost, I wouldnt get a S-trim, I would look at a Si-trim or T-trim.
Yeah i was leaning towards the T trim. 500whp is what im shooting for but if it makes more ill be real happy.
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Built 2v
Stroked, Cammed and Blown
Advanced Auto Built & Kurgan Tuned
Posts: 4678 | From: North Hayward, Cali | Registered: Sep 2010
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Y2K 281
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Member # 10132
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posted
I've run 9.0:1 compression with 17psi through a vortech Si trim for 3 years on 91. No problems whatsoever and the air to air intercooler keeps it within 15 degrees above ambient all day long. Vortech converted to blow through with A/A are incredibly reliable and efficient setups for street cars.
You definitely don't need that much boost to make 500hp on just the motor. If you want to make that much to the rear wheels then you'll need 15+ depending on the head/cam combo. Still wish I went with bigger cams but too late now :-/.
[ November 29, 2012, 10:15 PM: Message edited by: Y2K 281 ]
Posts: 326 | Registered: Jul 2010
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vortek01gt
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Member # 10149
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posted
If you are planning to run 15-16 psi i would stay around 9.0-9.5 cr. My last setup was like a 9.8cr stroker with 12-13psi and made 550hp to the tires on 91. imo there arent enough gas stations with e85 for it to be use for a street driven car. Just get a pump tune and race gas tune. Good luck with the build!
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2001 GT s-trim h/c t56 AED tuned
456hp 415ftlb 10psi-street
478hp 427ftlb 12psi-race
11.26@121mph 1.57 60ft-street
10.81@126mph 1.56 60ft-race
Posts: 622 | From: martinez CA | Registered: Jul 2010
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