No boost at the line

[TurboMonte 2]

1) If you would list your "build" in signature (or at least all in one place) of your car in question, it would certainly help ALL trying to help you,,,

2) You went way-too-far with this problem w/ using only an in-dash boost gauge (notoriously innacurate),,,

3) Also hope your 5500 rpm reference is NOT with in-dash gauge,,,

4) You're way off-base with regard to too-high a vacuum preventing quickness into boost--you can neither effectively control it nor would it have your anticipated impact,,,

5) A front-mount IC will normally affect/ slow your spool-up rate once you've launched--but not significantly beforehand,,,

6) Boost/ RPM/ Stall are related to engine HP/ TQ generated,,,

7) Your problem(s) is(are) not really related to rear wheel cyl size or 2X long rear shoes,,,

8) Basically, your converter is too loose/ sloppy for your "build"--& is even possibly "out-of-whack/ defective"...

 

[GNRick]

1) If you would list your "build" in signature (or at least all in one place) of your car in question, it would certainly help ALL trying to help you,,,

2) You went way-too-far with this problem w/ using only an in-dash boost gauge (notoriously innacurate),,,

3) Also hope your 5500 rpm reference is NOT with in-dash gauge,,,

4) You're way off-base with regard to too-high a vacuum preventing quickness into boost--you can neither effectively control it nor would it have your anticipated impact,,,

5) A front-mount IC will normally affect/ slow your spool-up rate once you've launched--but not significantly beforehand,,,

6) Boost/ RPM/ Stall are related to engine HP/ TQ generated,,,

7) Your problem(s) is(are) not really related to rear wheel cyl size or 2X long rear shoes,,,

8) Basically, your converter is too loose/ sloppy for your "build"--& is even possibly "out-of-whack/ defective"...

Some people say the converter stalls too high, some say it doesn't. Refer to post 36 where I posted a link to the transmission section on this board. Also, the transmission builder said he doesn't think the converter is at fault. I used two different boost gauges, both read the same. As for the build up on the car, I have 009 injectors, alky injection, 6157e turbo, powermaster brakes, chip by Turbotweek, 3" downpipe and some sort of racing catilytic converter, ATR dual exhaust with whatever mufflers ATR used in the mid 90's, LT-1 MAF/translator, Walbro hotwired. Best 1/8th mile was 7.8 seconds, best 60 foot before I started having this boost issue was 1.67 seconds.

 

[GNRick]

I pressure tested my ATR front mount intercooler today. Found several air leaks in the core and also where the blow off valve attaches. Looks like I need a new intercooler.

 

[GNRick]

I figured it out today. Pre-turbo exhaust leak. I didn't tighten the nuts on the studs from the header to the turbo. On street tires, I can hold more than 10lbs of boost without the car moving. Rear tires spin, but car does not move. I let off at 10 lbs boost, but I know I can hold more. I would like to thank everyone for their suggestions. :smile:

 

[TurboMonte 2]

Congratulations on your find...It's hard to imagine loosing that much exhaust/boost without hearing anything amiss...

 

[GNRick]

Congratulations on your find...It's hard to imagine loosing that much exhaust/boost without hearing anything amiss...

We even took turns standing next to the motor with the hood up while the other one power braked it. Also put Sea Foam down the intake, no smoke under the turbo. The way everything is bolted in place (turbo bolted down, header bolted to head) made it easy to miss those nuts on the studs. Nothing appeared to be lose, no funny sounds. ATR exhaust is kind of loud anyway.