As you know I'm still trying to figure out this blower setup.
Boost gauge arrived and shows 5psi at 5500rpm.
I'm told I would probably get close to 8psi if I could get to 6000 RPM.
I don't have the pressure gauge yet so I can't check the pressure.
I changed the fuel filter. What a royal pain in the ***!!
Someone should shoot that engineer.

Anyway, I'm questioning myself as to how it was before the blower.
Here is the question: when the car gets to 5500 to 5700 RPM it quits.
It acts like a rev limiter. Can it go to 6000 normally without falling on it's face? This is what I'm questioning. I believe it could but I'm not sure anymore.

I pulled just a couple plugs and the insulator is white.
Shows lean condition.
New plugs AC 41-602 gapped at 0.35.
I have the fmu full clockwise and also tried it one turn counterclockwise.
Same thing!
I guess I have to wait until I get the pressure gauge to see if I'm locking up the injectors but if it is,which means rich,why are the plugs white??
Later
Herb

 

You're not going to get 3 psi more between 5500 and 6000 let alone 5850 which is where your rev limiter kicks in. It's not necessary to turn it to 6000 to see 8 psi.

You're probably suffering from belt slip issues. Are any of your accessories covered in melted rubber from the belt? Or do you see black dust on the pulleys?

Make sure your belt is tight. You shouldn't be able to twist it more than 90 degrees with 2 fingers.

 

VV90,
So, what your saying is the 93 LT1 does have a rev limiter at 5850 RPM?
So when my car flatens out at that RPM that's what the factory had intended? It's not that I don't believe it. It's just that I don't remember that. Maybe I was shifting at 5600 RPM. Who Knows!
If that's the case, then it must be a slipage issue.
It's pouring out right now or I would go check the belt.
The only thing I noticed was two lines about double the thickness of a pencil mark on the bolt bracket next to the belt. one at each edge of the belt.
Do you have the belt and pulleys that came with the blower?
What PSI do you get?
Later
Herb

 

Maybe I answered your question too quickly. To be honest I'm not entirely sure. Here's what I'm 80% sure of: Your exact factory "redline" is 5850 I think, but the rev limiter is supposed to kick in at 6000. Hopefully someone else will give an exact answer. From what I've heard (Don't hold me to this, there's a lot of hearsay BS on this forum sometimes) is that due to the fact that the tach is so inacurrate, that sometimes you can over rev the motor because the tach will "lag" in effect, and not kick in the rev limiter in time. That might be why you see such high RPM's. I have an MSD6 BTM with a 6000 rev chip in it so I don't have to worry about that anyway. I recommend you get one yourself for the timing retard capability

That would be belt slippage. The belt is essentially melting and flinging it all over. You probably have more of those where you CAN'T see them.

I would never see anything over 6 psi and I had melted rubber over all of my accessories and my belt was TIGHT! I used the ATI belt and pullies for a while, but I recently just got a custom 8 rib belt, bracket, and tensioner setup that's giving me a consistant 8-9psi.

If your motor is "falling on it's face" at high RPM's and your sure you're not hitting your rev limiter, it could be a combination of both belt AND clutch slippage like I was seeing. Now that I'm seeing a consistant 8 psi my clutch slippage is very noticeable.

 

The LT1's rev limit is right at about 5800 ( 5780 as i recall) rpms. I noticed on my tach that it is almost pegged to 6000 compared to what my autotap actualy monitors the revs at...

What I have done is LT1 edit, removed the factory rev limiter to like 6200, and let the MSD limit it it at 6000...

I agree you should be getting your 8 psi way before the 5500 mark... I actually creep up above 8 at times.... Although I do not like going past 6000 rpms... you could try a test by adding a little belt grip make a run and see if it improves... that would be a tell tale test...

I'm running a 7 rib belt setup. If you are running 6 ribs then it is somewhat difficullt to get to 8 unless you really have the belt nice and tight... I think they (vortech) count on the belt slip to keep from pushing too much boost too the average no knowing person ... IMO

hope this helps...

Mo