I'm not seeing any belt dust anywhere. All the intake componants are stock. I'm not sure what the problem is. Also, the fuel pressure isn't going up above about 43psi.

A little info about the engine and SC:
L98 bored .030 over with TRW forged pistons 9:1 compression, and SVO 24# injectors
PISC with intercooler.
I've installed Boost, Fuel Pressure, and an Air/Fuel ratio gauges.

Thanks in advance for any help!

 

Sounds like you might have popped off a hose partially, the belt is slipping, or the air flter is restricted.

Or are you just sitting in the driveway revving it up?

If your not getting any boost pressure, then the FMU will not raise the fuel pressure above the stock setting (no vacuum)

later
larry

 

When you say "popped of a hose partially", I assume you're talking about the ones for the intercooler. I'll check the hoses when I get home. As far as when I'm watching for boost, I was watching my gauges as I was getting onto the highway. (I was trying to get onto the highway really quick. ) I know that the amount of fuel pressure depends on the boost, but I figured it would go up a little more than it did, even with only 3psi of boost.

 

Well, I tightened up a few hose clamps and tightened the belt as far as the tensioner would go, (only about half and inch more), and I got 6psi last night. There's still no belt dust. I'm still lacking about 3psi. How can I pick this up?

BTW, thanks for the ideas maniacc! :hail:

 

You could always go with a smaller pulley. The smaller the pulley the higher the boost. On the other hand if you go too high you will damage the engine and possibly the blower. Call the manufacturer and ask them how many lbs of boost you can safely run with the blower, your engine, and the compression of the engine. Then ask what size pulley you will need to accomplish this. You will obviously need a shorter belt.

 

Yeah, but the pully that's on there now is rated for 9psi.

 

You could be getting some bracket flex allowing the belt to slip, if it's a new belt, give it some time to break-in, then it may start gripping alittle better,

As for the fuel pressure, do you still have the little restriction orifice in the vacuum line going to the FMU? that restriction delays the boost from getting to the FMU. i removed mine, the fuel pressure seems to rise quicker.

Do yourself a favor, and go and invest in some quality turbo clamps from your local heavy truck dealer/partstore. I spent close to $100 for all my clamps. But i should never have to worry about a boost leak.

Did ATI provide you with a bracket that attaches to the main bracket and to the back of the alternator? i'm not sure if this is included in the P1sc kits.

 

I took out that little restriction oriface you're talking about a couple of days after I installed the SC.

ATI didn't provide that bracket you're talking about that attaches to the main bracket and to the back of the alternator.

 

here's a pic of the bracket i was refering too...



as you can see i still don't have mine installed yet. this bracket was a after thought.

later
larry

 

That bracket looks like it would help a lot. Thanks for the pic. I may have to talk to ATI about getting one of those.

 

another thing you may want to look at is your knock meter and how bad it may be retatrding your timing, if it is hearing a lot of knock from poor fuel your timing may be so retarded that it is not firing to its full potential as well.

TC

 

If you still have problems with slipping belts, you could always try Goodyear Gatorback belts - They are V-belts, but but with a ribbed pattern across them that makes them less likely to slip.

Worked much better than the Gates belt included in the kit - at least for me....

 

Is there any way to find that out without investing a bunch of money in a laptop and harness?

 

Question...

Is this the first time youve run this blower on this engine or engine combination?

Do you have ported heads, headers, exhaust, cam, intake work (i.e. runners, ported plenum, etc.)?

If you answered yes to ANY or ALL of those questions then it might not be a blower problem. The better your setup flows air, the less boost you will see at a given blower speed. Unfortunately, the blower companies dont explain this to the consumer. They rate the PSI based on STOCK engines. Call ATI and tell them whats going on. Im willing to bet that they will sell you another pulley and THEN you MAY see the boost you expected to see.

Hope this helps...

 

Yes, this is the first time I've run this blower on this engine or engine combination.

No, I don't have ported heads, headers, exhaust, cam, intake work (i.e. runners, ported plenum, etc.)

 

check out your boost gauge. I am forever repairing over tightened boost gauge fittings. it only take a couple of inch pounds to crush the ferule like it is supposed to be on to the teflon line, and really cranking on it nets you a partially closed off line (sometimes fully closed off). also check out this post: https://www.thirdgen.org/techbb2/sho...485#post641485

 

KS91, I'm only getting just over 6lb of boost @ 5200rpms. This according to the 2 dyno runs (printouts) completed after installation. Willie (moderator), brought the same point up to me on a previous post, about less air restriction since it's not a completely stock 350. I've only done minor modifications (check sig) but I agree it was enough to make a diiference in the boost levels being lower. I emailed ATI with the results that I have and am awaiting a response and a recommendation on pulley size. I currently have the 8 rib 4.25" pulley. I'm leaning toward getting the 12 rib 3.70" pulley setup with my logic being to shoot for 12lbs but probably only get just over 10lbs of boost.