So i am thinking of upping the boost! (doh)
01-31-2008, 11:23 AM
#22
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Would there be a high probability of failure on an otherwise stock car with an installed Greddy TT ( ~ 375whp; by a reliable shop -Forged,PerformanceFactory) if one were to run it to 100,000 mi? Or that's unlikely to reach that mileage on a stock block? Is there still quite a high risk of the FI install?
I've read things go both ways..people have really used their car 20k+ miles and others' have had issues..
I've read things go both ways..people have really used their car 20k+ miles and others' have had issues..
01-31-2008, 11:26 AM
#23
Originally Posted by Sharif@Forged
I would only do it, if you were prepared to build the engine if something breaks. It's still unlikely that it will break at 9psi, but I like to play it safe. 
01-31-2008, 11:51 AM
#24
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I've seen quite a few stock block Zs pushing 9-10psi without problem. All eventually built the motor....none of which were blown. As long as you have a good tuner and are running a good EMS like the VPRO, I say go for it.
01-31-2008, 12:06 PM
#25
Originally Posted by Old School
I've seen quite a few stock block Zs pushing 9-10psi without problem. All eventually built the motor....none of which were blown. As long as you have a good tuner and are running a good EMS like the VPRO, I say go for it.
01-31-2008, 12:45 PM
#26
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I have been ordering parts, some of them have just taken their time getting in.
I have most of the custom stuff in already. If you are getting a new block, let me know. I need some stock parts.
I have most of the custom stuff in already. If you are getting a new block, let me know. I need some stock parts.
01-31-2008, 01:19 PM
#27
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Originally Posted by chris'smax
I knew this was going to happen . Car felt fast as **** when i picked it up and now it feels slow as ***** and i feel like i am going to fall asleep when going WOT. In order to remedy this feeling of inadequacy i am thinking of taking it to Sharif soon and getting him to up the boost. As of right now the car makes 405whp @7.5 psi on his dyno dynamics. I would like to get to about 450whp on his dyno and i think it would take about 9-9.5 psi to get there. I am planning on building the motor this summer and i do not use my car as a daily driver so i have other means of transportation. My question to you guys is do you think it is worth the risk?
Thanks
Chris
Thanks
Chris
Dyno numbers aside...........We have run 9 to 9.5 psi on all of our cars safely and have not had any issues. And we do it on 91 octabe. Ofcourse this is with a good tune and I know Sharif will give you a good tune
01-31-2008, 01:22 PM
#28
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Originally Posted by Sharif@Forged
Good point. The two stock block cars running 12-14psi we did, both were running FCON's.
So Sharif, are you saying that 9 psi would be "do-able" if i was to only run it every once and awhile?
I guess my main question is which (boost pressure or whp) is more of a concern. For example would a Z running 10psi making 380whp be more in danger of blowing a motor than a Z running 7.5 making 405whp?
I know that more pressure creates more heat which leads to a higher rate of failure.
Last edited by chris'smax; 01-31-2008 at 01:56 PM.
01-31-2008, 01:25 PM
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Originally Posted by TurboTim
Dyno numbers aside...........We have run 9 to 9.5 psi on all of our cars safely and have not had any issues. And we do it on 91 octabe. Ofcourse this is with a good tune and I know Sharif will give you a good tune
Tim, how much power are you guys making on a dynojet at these boost levels?
01-31-2008, 02:43 PM
#31
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Originally Posted by chris'smax
Tim, how much power are you guys making on a dynojet at these boost levels?
450-460WHP.Stock engine, cams, heads, plenum, etc.......but with dual 3" exhaust
02-01-2008, 05:37 AM
#33
Originally Posted by chris'smax
So Sharif, are you saying that 9 psi would be "do-able" if i was to only run it every once and awhile?
I guess my main question is which (boost pressure or whp) is more of a concern. For example would a Z running 10psi making 380whp be more in danger of blowing a motor than a Z running 7.5 making 405whp?
I know that more pressure creates more heat which leads to a higher rate of failure.
I guess my main question is which (boost pressure or whp) is more of a concern. For example would a Z running 10psi making 380whp be more in danger of blowing a motor than a Z running 7.5 making 405whp?
I know that more pressure creates more heat which leads to a higher rate of failure.
02-01-2008, 08:48 AM
#34
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Originally Posted by Sharif@Forged
Exactly. Inlet pressure is nothing compared to combustion chamber pressure. So the power number is what I look at, in gauging safety, rather than boost pressure. The way Tim's kit was generating airflow...1-2psi is going to add rouhghly 30-40whp. Lets do it.....but just use it sparingly, and keep it on low boost most of the time.
And just to add to what Sharif is saying.........I have been running my car at these boost/power levels for 35K miles.Sometimes I run it a bit higherif the need arises
The stock motor is sitting at 60k right now.
02-01-2008, 11:53 PM
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i wouldnt risk it, imo. paying 1500 bucks on top of building your motor just to add 50whp isnt worth it. build the motor, then get nutty. this is the same reason why i didnt have a ebc on my stock block setup. i would have been pissed if i blew my motor because i wanted to push the stock block envelope. 1500 bucks can buy you a nice clutch, exhaust, or lsd. ultimately its your choice.
02-03-2008, 05:28 AM
#39
Good tune or not, you will be exerting more stress on the rods (obviously a better tune will minimize this increase). You may have a "lucky" set of rods, but you're running them over spec already. You are shortening their lifespan -no way to know by how much exactly... Some people get away with tens of thousands of miles, others just hundreds at xxx whp. Metal fatigue is a stochastic process and is cumulative. In other words, it is unpredictable, and stress incurred at high boost is not reversible by turning the boost back down. A rod might let go at low boost at virtually no load if it has finally reached its cumulative limit of stress it can handle.
Sharif's recommendation to only occasionally bump up the boost when "needed" is a great way to minimize the chance of failure if you decide to go for it. Good luck.
Sharif's recommendation to only occasionally bump up the boost when "needed" is a great way to minimize the chance of failure if you decide to go for it. Good luck.
Last edited by rcdash; 02-03-2008 at 05:35 AM.
