Hi
I just bought my 1998 JDM vvt-i tt a few weeks ago...
The car runs creat, A blitz cat-back system and the speed limiter(japan, max 180 km) is the only thing that has been modified on this car.
When I took it to a dyno test, my boost kept falling down, first run, we took it slow up to 6 gear and at 4000 rpm the boost dropped all the way down. I only have the original boost gauge so I don`t know what preassure I have...
On the second run I took it to about 6000 rpm on all gears, but in 6 gear my boost dropped at 6000 rpm....
On the road, I don`t have these problems, just on the dyno... meassured 275 hp on the wheels an 293 ft-lbs.

when they put your car on the dyno they hook a t up to your blowoff valve vac line. they may not have had the t on correctly and it was leaking boost when the pressure got to high

no, they didn`t hook up a vakuum line. should they do that? and why?
now I`m boosting 1.2 bar on the street(BPU all done) and no problems at all. no leacks