Dude, I'm running out of ideas.

Have you tried pulling the vacuum line to the bypass? Make that sucker stay closed or block it off altogether and do a WOT pass. I've had one hang open before and it limited boost to like 7 psi.

You've tested all the intake passages and not found anything. Have you tested the intake for leaks. Maybe you have a cracked intake? Are all the injectors properly seated?

 

Could it possibly be your boost gauge? The way you said that it was getting to 7lbs and staying there. Just throwing it out there.

 

I hope I can do that tomorrow


I forget what rpm to be honest, its early tho. It goes there and stays flat, from 1st gear, to the top of 3rd (th400)

I have double o-ringed the injectors, because that was the only thing I could do to seal up 2 of them that kept giving me problems. Even then, the leak was miniscule. I have put 15lbs on the intake, and not or felt even a peep from it

I have pondered that. But the car feels like ****. And I have posted my track times and trap speed. The car just truly doesnt make the power it should. Maxed out d1, 390ci, and a return style fuel system with dual pumps to feed the beast. It just doesnt cut it.

I bought a leak down tester today. But may just do a compression test 1st. I've never done a leak down and honestly have a few questions before I start it

 

Sounds like you have tried just about every thing on the blower end, I would get the compression test and leak down done to rule out that as a possibility. Hope you get it figured out. What are your Q's on the leak down test ?

Also do you run a catch can on your engine ?

 

itd be nice to see a boost curve from a data log to see where and when its leveling out.

 

At this stage, it's one of two general things, 1, the blower isn't moving enough air to make more than 11psi of boost, 2, something in your system is bleeding off boost.

Also, I don't think you're overspinning your blower either. (7.65" / 3.4)*4.10*6800rpm equals 62730 blower rpm, which is only 730 rpm over the rated 62,000 limit. 62,000 blower rpm would occur at 6720 rpm, so you're only overspinning it if you are consistently going over that engine rpm.

Is there anyone around you could swap over the blower to another one to test it? Hell, if you were close, I'd let you try mine since it's just sitting in a box in my garage right now. That way it'll at least eliminate the blower as the potential source of the issues.

 

Well, I was wondering of the pistons have to be at tdc for it to be done accurately. Only way I know to do that is pull the front cover off, or stick something down the spark plug hole, which I dont really want to do. I dont have any help, so holding something there and turning the motor over by hand is a pita. Seems like if its at bdc and I fill with air, it will take longer for the air to leak out, thus giving a false reading compared to a piston that is at tdc. I was thinking maybe pull the pushrods and do the test that way? And just leave pistons alone where they sit?

I have -10 lines off both valve covers running to a vented can

Thats good to hear. I had it in my head that 6200 engine rpm was where the limit was on the blower. I dont know of any d1 cars around that I could try their blower on my car.

Bout to hop outside and pull spark plugs I guess

 

You want the pistons at tdc. It is a pain in the *** by your self but this helped me...
Find TDC on #1 cylinder, you test the #1 hole and #6 at this time. Roll the engine over 90* and then #8 and #5 will be at TDC, check those 2 holes. Roll the engine over 90* this time #7 and #4 are TDC, check those. Roll another 90* and #2 and #3 are TDC.

Does your catch can have more **** in it than normal ?

 

I was afraid you were gonna say that lol. Can looks normal. I'll get them to tdc. I am scared to see the results of this. But if they check out ok then i am even more confused. I am not ruling out belt slip, but damn i ran that belt a long time, when it came off it looked as good as the day i put it on, other than it being stretched pretty good, and it had tons of abuse on it. This is just a pita to do for it to not be the issue. I am just out of ideas

 

Have you changed the belt with no change in boost ?

 

yes sir. Had to order a leak down tester. The one I bought wouldnt go over 20 psi, even though it said it went to 100. I'll post results when I can do the test

 

Did it do 10.70's@127 with a 1.60 60ft with 11 lbs of boost or with 16 lbs ? If it was with 11 lbs, what did it do at 16 lbs.?