You are likely at the limit.

 

why not get a dyno and know for sure????

 

I wil when I get a chance. But I means as far as amount of boost.I woild think the amount of boost would affectt he stressing the engine since it directly affects cylinder air volume whether it runs efficiently or not.

 

You also need to consider the mileage on the car. Some engines have failed merely because of fatigue.

 

Granted that torque is a function of boost, the bottom line is Torque is what breaks things. HOW the torque is applied also makes a big difference. Torque applied smoothly across the RPM range is a lot easier on the drive train than having it all hit at once when some turbos spool up.

 

boost doesnt mean anythiing in terms on being at a limit. boost is a function of restrictions. not directly tied into HP. If you are not making 400 whp, you are not at the limits, regardless of boost ( as long as the boost isnt heating the air so much you are knocking uncontrollably)

All these points are on a stock block with blowers. Very safe still and way more than 9 psi. 9 psi might be a good # with a turbo kit bc that usually around 400 hp. You need alot more than that with a blower to make that kinda power.

 

Cant look at the graph right now since im posting from my phone at work. So it is the actual power and torque that breaks things? I thought though that as far as rings and such the amount of boost directly affects cylinder air volume which in turn stresses the engine internals more. I will try to get my car to a Shop to tune and dyno and see from there i guess. Maybe i will need to up the boost if im not at 400

 

blah blah blah

your fine. don't listen to all this nancy boy parania. your powerlevels are 100 percent fine as long as the tune is good(get a retune asap). honestly I've seen 11, 12, up to 15psi(not to long) on stockblocks last. less tq than turbos and less stress due to constant flow of sc oppose to turbo combined with linear boost you are fine. **** I feel like this 400hp limit stuff is all shananigans. I had over 15kmiles on my build and still going strong. get a tune and call it a day.

WHEN IS THE LAST TIME YOU HAVE SEEN A MOTOR BLOW, ON A SC NOT RUNNING RETARDED BOOST. NEVER. unless it was user error or horrible tune.

 

Well remember also that you had Dave tune your car as i did too.

 

Nothing. Even Sharif said it was a good tune.

His initial complaint was that the car was running rich. On his dyno chart, the AFR touched 10.7. Nonethless, that means it was actually a safe/conservative tune. Running a little on the rich side helps stave off pre-detonation and keeps the motor a little cooler, which is a benefit. Pre-detonation is really, really bad for a motor.

If you run way too rich (e.g. an AFR below 8), it can wash the cylinder walls, but his AFRs were not that low. I think he indicated that at one point he saw it drop below 10 when he was driving, which is still in the safe zone.

 

We warranty our stock motor install and tunes at no more then ~390 RWHP based on my extensive testing. No more then 9PSI for turbo and no more then 11PSI for supercharger. So you can bump the boost a little more from your 9PSI setup. With the Procharger you're not going to make much more peak power but you will make more torque and faster application of boost. We've also installed a wastegate limited to 11psi (normally used for turbos - Tial 44MM) on the outlet of the IC and 15PSI pulleys to allow even faster application of boost but limits to the stress placed on the motor. Works GREAT! Some other upgrades are needed.

SC's don't produce the torque that Turbos produce. Torque is what bends the rods and blows motors. I haven't had ANY stock block failures (within these limits) until a customer recently damaged his head gasket after installing a T-Trim and 15PSI of boost (unregulated) after running his motor at 13PSI and 7200 redline for over 30K HARD miles.

 

a $400 wastegate seems excessive when you can just use this for less than 1/2 price
http://www.928m.com/parts/boostlimitervalve.php

 

http://members.***.net/ry.anderson/ForcedInduction.pdf

a good read with a good explanation.

basically psi and cfm flow are separate values. just bc you have high boost doesnt mean you are flowing high cfm's of air.

 

The only thing that matters, is the MASS of the airflow, which is usually measured in lb/min...not the pressure.

A good example is a tiny little turbocharger generating 20 psi of boost pressure, will flow significantly less airflow, than a much larger turbo charger at 20psi. Think JWT TT kit, vs. APS Extreme TT Kit.

So the only adage that boost is boost, is a common mistake, and 100% incorrect.

As a general rule about 400whp is my personal stock block limit for daily driving. An occasional blast above this is OK, but not as a general rule.