Limitations?
Thread Starter
Heel & Toe
Joined: Jun 2006
Posts: 18
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Limitations?
I currently have a P1SC pushing 7 psi. with L.G. longtubes on a stock bottom end. Would anyone consider purchasing a cam and or heads combination, or would it be too much for the bottom end? Thanks for all replies. By the way, its a C5 vert.
Instructor
Joined: Jan 2004
Posts: 228
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From: Seven Valleys Pennsylvania
IMHO, I'd be a little concerned goin over 7psi on a stock bottom end. I just had a forged 346 installed due to the No. 7 ring land cracking
I had a conservative tune in the car since it was my daily driver but things can still go wrong. I beleived that I was safe from harm at that level...I did put over 25,000 miles on that setup, and I do not drive conservatively at all
, but I am also very mindful of detonation, etc. and don't know exactly why it happened, but it did. Of course it did provide me with a pretty damn good reason to get a forged bottom end, cam, springs and so on, so there was a bright side
I am sure some have gone much further on stock bottom ends, but again I would caution you based only on my experience. Good luck with whatever you decide
I had a conservative tune in the car since it was my daily driver but things can still go wrong. I beleived that I was safe from harm at that level...I did put over 25,000 miles on that setup, and I do not drive conservatively at all , but I am also very mindful of detonation, etc. and don't know exactly why it happened, but it did. Of course it did provide me with a pretty damn good reason to get a forged bottom end, cam, springs and so on, so there was a bright side I am sure some have gone much further on stock bottom ends, but again I would caution you based only on my experience. Good luck with whatever you decide
Le Mans Master
Joined: Jun 2004
Posts: 7,157
Likes: 154
From: The Arid Sunny Desert
Originally Posted by shanetr99
I currently have a P1SC pushing 7 psi. with L.G. longtubes on a stock bottom end. Would anyone consider purchasing a cam and or heads combination, or would it be too much for the bottom end? Thanks for all replies. By the way, its a C5 vert.
What kind of power are you putting down? The reason that I ask is that I have a heads/cam 346, with a stock bottom end, making close to 400 RWHP and I just placed my order for a Procharger. After speaking with my tuner we concluded that it is wise to go with a 5 psi setup and conservative tune. I don't think that it would be wise to go higher than 500 RWHP, especially with my 3.90 gears & 3200 stall A4, which keeps the rev's up as it is. I have already upgraded springs and rockers so the top end should be O.K. But then again, you never know.
Thread Starter
Heel & Toe
Joined: Jun 2006
Posts: 18
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The dyno read 442 rwhp 475 torque. The reason for the low h.p. is from only taking it to 5500 r.p.m. Dont ask me why he stopped there. Anyway I'm guessing my true rwhp is around 490. Can I ask you how many r.p.m. you are running at 65 m.p.h.? Are you happy with your gear ratio and how much difference did you see in quarter mile times? Thanks.
Instructor
Joined: Jan 2004
Posts: 228
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From: Seven Valleys Pennsylvania
Originally Posted by shanetr99
So you would not advise installing a cam or heads?
Le Mans Master
Joined: Jun 2004
Posts: 7,157
Likes: 154
From: The Arid Sunny Desert
Originally Posted by shanetr99
The dyno read 442 rwhp 475 torque. The reason for the low h.p. is from only taking it to 5500 r.p.m. Dont ask me why he stopped there. Anyway I'm guessing my true rwhp is around 490. Can I ask you how many r.p.m. you are running at 65 m.p.h.? Are you happy with your gear ratio and how much difference did you see in quarter mile times? Thanks.
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Le Mans Master
Joined: Jun 2004
Posts: 7,157
Likes: 154
From: The Arid Sunny Desert
Originally Posted by goinpostol
IMHO, I'd be a little concerned goin over 7psi on a stock bottom end. I just had a forged 346 installed due to the No. 7 ring land cracking I had a conservative tune in the car since it was my daily driver but things can still go wrong. I beleived that I was safe from harm at that level...I did put over 25,000 miles on that setup, and I do not drive conservatively at all , but I am also very mindful of detonation, etc. and don't know exactly why it happened, but it did. Of course it did provide me with a pretty damn good reason to get a forged bottom end, cam, springs and so on, so there was a bright side I am sure some have gone much further on stock bottom ends, but again I would caution you based only on my experience. Good luck with whatever you decide
I had a conservative tune in the car since it was my daily driver but things can still go wrong. I beleived that I was safe from harm at that level...I did put over 25,000 miles on that setup, and I do not drive conservatively at all , but I am also very mindful of detonation, etc. and don't know exactly why it happened, but it did. Of course it did provide me with a pretty damn good reason to get a forged bottom end, cam, springs and so on, so there was a bright side I am sure some have gone much further on stock bottom ends, but again I would caution you based only on my experience. Good luck with whatever you decideHow much does a forged 346 run these days?
Pro
Joined: Aug 2004
Posts: 596
Likes: 0
From: PA
Originally Posted by mdhmi
I'd pulley it down. 7psi isn't enough.
After a couple years running 10-12 psi then pop in a forged short.
After a couple years running 10-12 psi then pop in a forged short.
shanetr99,
I've done alot of reading on Fi for the Vettes over the years, and asked alot of questions, and done alot of research. Be careful with going with much more boost that what you are running now, unless you don't mind keeping in the back of your mind that a new motor might be just right aroung the corner.
Do your research, and talk to the reputable tuners to get the honest low-down on what they would recommend on what boost is considered safe.