When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Guys, before turbocharger modification I decided to see how is it running now. Its stock car with only 100cpsi kat and cup pipe instead of the muffler. In the history file i didn’t find anything about boost increase and I'm wondering why is so high above 5000 rpm.
your times are clearly below stock. i do not think that kat and final muffler bring you there. values for the 355hp/x33 model were below that values. so may be the spring was upgraded earlier.
your times are clearly below stock. i do not think that kat and final muffler bring you there. values for the 355hp/x33 model were below that values. so may be the spring was upgraded earlier.
so running oem spring 0.75 bar boost is max what turbo will reach?
are you running the stock waste gate exhaust with Catalyst ? These can restrict and cause boost creep / spikes cooler temperatures can make this worse.
are you running the stock waste gate exhaust with Catalyst ? These can restrict and cause boost creep / spikes cooler temperatures can make this worse.
Thirty year old wastegates are usually past their service life and require rebuilding (if you can get one apart without destroying it) or replacement.
Mine had a worn valve guide so it was probably opening at 1 bar for all I know. That's why it's important to have instrumentation that will indicate and record boost pressure and afr.
The 3.3's are slightly less boost than the 3.6. Factory pressure should be within spec for the 1991/2 3.3 Liter Turbo between 0.75 to 0.81 bar. It could be the gage it could be you have an updated spring it could be boost creep. How/where are you tapping into the system to read pressure?
This is the control line to the vacuum limiter, it is also connected to a switchover valve and the warm-up regulator.
The charging pressure is tapped better and more precisely on the thin hose above it, which leads directly to the wastegate.
This is the control line to the vacuum limiter, it is also connected to a switchover valve and the warm-up regulator.
The charging pressure is tapped better and more precisely on the thin hose above it, which leads directly to the wastegate.
Fritz
Good catch.
I looked at that picture and thought something's not right there. Should have walked to my garage and taken a peek at my setup as that's where I used to be tied into.
I had to move my tee the the signal line for the WUR when I installed the Innovate PBS-1 afr/boost gauge. The boost value does correlate with the mechanical gauge I used to run.
10-30-2022, 03:06 PM
Acceleration tests of my 3.3 turbo...
