is all i can say...I redid a lot of vacuum lines on my car over the past few weeks and actually now have my wastegate signal plumbed directly from the compressor housing on the turbo; this revealed a serious problem; my wastegate spring has gotten really saggy... it went from 6psi, to 4psi when i redid all the vacuum lines; and then to 2-3psi when i plumbed the wg signal; the spring was SUPPOSED to be a .4 bar
it was a serious letdown driving the car around when its only a little faster than stock; the car would open the wastegate at half throttle and it'd get loud as HELL
Today I installed a boost controller.... and now i'm running 8psi in 1st, 9psi in 2nd and 10psi in 3rd with no knock... i've got ignition dialed back 2 degrees from base timing
WOW; the car is EVIL EVIL now; and right around 7psi which i've never hit before it makes a really loud whistling spool sound; and at 10psi its making a turbine scream; its awsome
i scared the **** out of someone today when they were turning and i went by lol
whats weird though is after redoing all the vacuum lines and stuff; my blow off valve isnt NEARLY as loud as it used to be... very odd i think... it still blows off; its just quieter... no compressor surge or anything like that
DaveGS4
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Jan 23, 2026
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Cool 
its as loose as it can get; the Turbo XS Type-H uses washers to tighten the spring inside (its a piston-based valve)
ran a 350z convertible tonight from a 2nd gear rollon... had 4-5 cars on him through 3rd...
ran a 350z convertible tonight from a 2nd gear rollon... had 4-5 cars on him through 3rd...
Lexus Test Driver
bean correct me if i'm wrong but aren't you suppose to tighten it instead of loosen?
Racer
When I go to a clublexus meet, someone with an SC300 turbo is going to give me a ride, period.
Lexus Champion
Quote:
Originally posted by SC400-V8
When I go to a clublexus meet, someone with an SC300 turbo is going to give me a ride, period.
I know Gazi in Queens has a turbo 300. I'm in line tooOriginally posted by SC400-V8
When I go to a clublexus meet, someone with an SC300 turbo is going to give me a ride, period.
Lexus Test Driver
Awesome. My turbo SC3 is also alive and coming home soon... its been gone for almost 4 months now... its all worth it though, its been in the shop throughout the winter. Coming out just in time for some nicer weather.
Kevin
Kevin
Lexus Champion
Ah...everybody's getting their NA-T's on the road for spring and mine is down for more work again 
.
Bean...glad to hear it's running well.
.Bean...glad to hear it's running well.
Lexus Fanatic
Quote:
Originally posted by SC400-V8
When I go to a clublexus meet, someone with an SC300 turbo is going to give me a ride, period.
There's nothing else like it! Originally posted by SC400-V8
When I go to a clublexus meet, someone with an SC300 turbo is going to give me a ride, period.
Lexus Fanatic
Quote:
Originally posted by Lex Luthor
Ah...everybody's getting their NA-T's on the road for spring and mine is down for more work again .
Bean...glad to hear it's running well.
LL, what happened?Originally posted by Lex Luthor
Ah...everybody's getting their NA-T's on the road for spring and mine is down for more work again
.Bean...glad to hear it's running well.
Quote:
Originally posted by lexcoupe
Awesome. My turbo SC3 is also alive and coming home soon... its been gone for almost 4 months now... its all worth it though, its been in the shop throughout the winter. Coming out just in time for some nicer weather.
Kevin
Check the forcast... we have snow coming our way.Originally posted by lexcoupe
Awesome. My turbo SC3 is also alive and coming home soon... its been gone for almost 4 months now... its all worth it though, its been in the shop throughout the winter. Coming out just in time for some nicer weather.
Kevin
Chris