12#'s Too Much?

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 20, 2006

#1

• Jun 20, 2006

• #1

Right now I'm pushing 7-7.5 #'s boost and was wodering if 12#'s would be too much. Reason asking is because I have the 4.75 crank pulley KB sent me to get 8 #'s and I have my stock cobra crank pulley that will make 12#. My current meter is pegged and I was going this weekend to get a new SCT Big Mouth and re-tune and was itching for a smidge more HP. Would this be too much on my stock bottom end? Right now I'm making 465 to the wheels and won't be happy until I'm half way to 1k HP Thanks!

 

bigcat

start with the upper hole, and if more traction is

May 1, 2005

3,015

1

79

7200 feet

Jun 20, 2006

#2

• Jun 20, 2006

• #2

its just a matter of time before the bottom end goes. do you want to rebuild now or later??

i would see what #s you get with the mods planned without the added boost.

 

S/CBlack95GT

New Member

Apr 6, 2003

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Tampa Palms, FL

Jun 20, 2006

#3

• Jun 20, 2006

• #3

You are already putting too much on the bottom end technically. If you dont run the car that hard I would go for it. I wish I had initially increased mine to 14 psi just for bragging rights and more mid range power.

 

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 21, 2006

#4

• Jun 21, 2006

• #4

The only times it gets run hard are at the dyno and every now and then i get on it just to feel the power
(try to hear the whine )

 

95strokerPSU

Member

Jul 29, 2004

986

1

19

Sacramento from Philly

Jun 21, 2006

#5

• Jun 21, 2006

• #5

If it's not your daily driver and you can afford to fix if it does break, then by all means crank it up some.

 

Methodical

15 Year Member

Dec 1, 2003

1,192

11

59

Clinton, MD

Jun 21, 2006

#6

• Jun 21, 2006

• #6

95strokerPSU said:

If it's not your daily driver and you can afford to fix if it does break, then by all means crank it up some.

Click to expand...

That is the key. If you can afford to fix if it breaks and you can afford to be without the car.

 

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 21, 2006

#7

• Jun 21, 2006

• #7

It is not my DD. In fact I Rarley drive it at all. Cept to go to shows and what not. Would low mileage be an issue? This car has always been a garage queen!

 

mytight95

Active Member

Apr 11, 2003

2,605

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46

Dothan,Al

Jun 21, 2006

#8

• Jun 21, 2006

• #8

would help, better bearings etc., less stress has been placed onthe rods etc. over their lifespan as well......


jason

 

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 21, 2006

#9

• Jun 21, 2006

• #9

Since the last tune of 465hp I have: changed to a romac balancer, Msd billet distributor (stator going out), tighter belt (belt slip on the dyno), 4.81 crank pulley (was 4.75), new motor oil, transmission fluid, gear oil, tightning of exhaust (slight leak) and buying the SCT Big mouth meter. Do you think with these small mods (along with the tune) will gain the extra 35 HP I need for the 500 mark? If not I may have to chance and slap the 5.85 crank pulley on.

 

G

Green 94 5.0

Founding Member

Mar 25, 2002

2,601

12

79

Ft. Lauderdale, FL

Jun 22, 2006

#10

• Jun 22, 2006

• #10

it is very possible. i would try before you go with more boost.

 

bigcat

start with the upper hole, and if more traction is

May 1, 2005

3,015

1

79

7200 feet

Jun 22, 2006

#11

• Jun 22, 2006

• #11

might as well try to see before you add more boost, IMO.

 

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 22, 2006

#12

• Jun 22, 2006

• #12

I'll let you guys know when I get back this weekend! 12#'s or not I'm gonna have 500 hp! Hopefully the block will last, if not I will have a better one replacing it.

 

BlackVert

15 Year Member

Oct 3, 2003

5,589

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98

Bethesda, MD

Jun 22, 2006

#13

• Jun 22, 2006

• #13

95strokerPSU said:

If it's not your daily driver and you can afford to fix if it does break, then by all means crank it up some.

Click to expand...

mine is my daily driver

 

KBCobra95

New Member

Aug 28, 2005

356

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North Carolina

Jun 22, 2006

#14

• Jun 22, 2006

• #14

How much boost are you running?

 

BlackVert

15 Year Member

Oct 3, 2003

5,589

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Bethesda, MD

Jun 22, 2006

#15

• Jun 22, 2006

• #15

KBCobra95 said:

How much boost are you running?

Click to expand...

i have the 8# pulley on, but i don't know how much boost it actually makes.

OT: did you see my other question to you in my spark plugs thread about datalogging your intake air charge? it may not be an issue though for you since it sounds like you don't drive it much. i have intake air temps of 230+ after driving for a while. that is when i ping. that is also why i started my other thread about coated headers

 

KBCobra95

New Member

Aug 28, 2005

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North Carolina

Jun 22, 2006

#16

• Jun 22, 2006

• #16

No I didn't see your other thread until you pointed it out. So i'll post here. No I don;t have a way to datalog my intake temps. I can drive for 2 hours staright and have no pinging probs. My car has a straight 11.5 A/F ratio (custom tune) so I guess he made sure i wouldn;t have any of those probs. he just told me not to make too many freeway blasts, cause that is what heats up the air so much?