wow, thats pretty good reliability with the 4.5. I dont think my car will see 12,000 more miles on it for another quite some time..i put maybe 2,000 miles on it a year.

 

I am taking my powerdyne 4.5 off this weekend or next. I am selling the car so.. It is on my 96 formula 6 speed and I will say that it is faster than my old 94z28 that trapped the 1/4 @ 110 mph. The kit has been on for 5000 miles. Give me a call and maybe we can work something out. It also has the fmu.
Brandon
810-691-9025

 

Yes, I love my powerdyne.
It's totally quiet and with the 9 lb pulley it makes
tons of torque below 5000 rpm.
I hardly ever rev over 5200 rpm.
Started with the 6 lb pulley and FMU and tuning,
but went with the 9 lb because the boost guage only read 4.5 with the 6 and 6 with the 9.
What are other powerdyne guys with boost guages showing?
I hammered my car for 3 years before the S/C but now I don't push it nearly as hard and have 10,000+ S/C miles
on my stock over 100,000 mile well maintained engine.
My car still puts a big smile on my face everytime I drive it and let it go just a bit.
One thing with verts though.
We had to relocate an secondary abs valve which was on the frame rail right where the blower head is located. The abs valve wound up where most guys CAI goes.
It was an extra days work and took about a week to do the whole thing including relocating fuel lines for the longtubes, but well worth it.

 

sent PM

 

Very nice! and your using madz28 tune/FMU..and so far no problems with even a 9# pulley.

I've also heard that the powerdynes aren't putting out the supposed boost numbers that the pulley is allegedly rated at...

are you sure that the 6# pulley wasnt actually a 4.5..while the 9# wasnt actaully a 6? just seems very coincidental that your getting the exact readings of specific pulleys.

 

I got the 9 lb pulley directly from powerdyne.
It's 2.70". The 6 lb is 2.93" and the 4.5 is 3.12"

 

This place also has a 2.62" pulley among all their other stuff which would theoretically be 12 psi with the powerdyne on a 350 cu inch at 5800+ rpm if the internal belt didn't go.
It would probably show 8 or maybe 9 psi on my car,
But I'm not gonna put that one on. I'm not gonna get greedy and take a bigger risk of blowing my engine.
The powedyne belt has an rpm limit and the smaller the pulley the sooner one will reach it.
I put the extra powerdyne universal bypass valve on mine to make sure by belt didn't get any undesigned for backwards stress if I closed the throttle under high boost.
I'll bet that's the major reason for internal belt failure
If you hardly ever rev past 5000 rpm and have a 383 or 396 the 2.62 " would probably be ok and show 5 or 6 psi vs 8 or 9 on the 350.

http://www.aspracing.com/frame.htm

 

Interesting. I think the max I would ever go on the powerdyne is 6 psi. I've heard way too many problems from people running them higher. Not too mention blowing my engine, tranny, and whatever else. As long as i hit my approximate 400 rwhp with a mild heads/cam/blower setup, ill be .

When you say the belt gets backwards stress under high boost if you let off the throttle...does that mean the belt would sort of snap back and cause it to break or slip under major decceleration? is that common amongst blowers in general? I've never heard of that.

 

Well if you have 6 psi and suddenly close the throttle without a bypass valve, that boost acts as a force the blower has to push against for a moment, causing the belt
to first freewheel then get pushed instead of pulling.
Kind of like the way forces act on a rear end when you let off the throttle and coast except the gears are steel and the internal belt is kevlar, I believe.
Enough of these back and forth forces will cause the belt
to weaken and then the cogs to start breaking off.

 

The cam he is talking of is the cc305 very common off the shelf blower cam.

 

Thanks for that info.I didn't know that mine WAS a blower cam. I just thought it was just a regular cam. So that is not a bad cam for my setup?

 

It's not specifically a blower cam but alot of blower guys use it as one.

 

Got it. Thanks

 

I actually have that cam in my car now, in anticipation of the powerdyne sitting in my closet for the last 2 years. Ive been going back and forth on this situation with myself since I bought it,.....of whether or not to put it on my stock bottom engine. Ive got stock heads right now, that cc305 114LSA cam, LT's, 58MM TB, no cats, 2500 stall, 1.5 RR's, hooker catback. I was quite amazed at what the cam alone does without the blower. Im going to switch to 1.6 rockers soon, but im building a forged 355 with the goals of about 450 RWHP on some LE2 heads with the powerdyne and current cam, or maybe slightly larger. I have the 4.5 psi kit, but i have a 6psi pulley, and a 7 in. crank pulley, which by my calculations should make 7.5 psi, but more than likely ill only see about 5 psi I would guess. Then to top it off I will most likely throw a 100 shot on after the engine is broken in well. I plan on running an intercooler with the 355, but Ive been telling myself not to put the 6# setup on the current engine because I have a bad feeling Ill grenade it the way I beat on my toys. Id like to hear some more powerdyne builds and numbers myself guys, so keep this thread going! There must be a few more guys using powerdynes, lets hear your glory stories (and horror stories).

 

Had a Powerdyne 4.5psi kit installed with a bigger K/N. Motor was all stock except for Hooker shorty headers and a cutout. Dynoed 340rwhp/372rqtq. I believe the HP peak was at 5250 rpm, then it dropped off. Motor temp was at 210* on the dyno. Upgraded to the 6lb pulley and started getting alot of smoke out of the oil filler shortly thereafter.

Rebuilt the motor and said bye bye to the blower.

Had the blower on the car for maybe 2500 miles. Car had 78k on it when I bolted it on.