How much boost should I expect- '90 740ft

Should go WAY into the red.

Something isn't right.

Of course, you DO understand that you only get boost while accelerating under load?

No boost will occur when the car is sitting still and you rev the motor.

That sounds about right. You could hook up a calibrated pressure gauge and should see 7-8 psi at full boost. You can crank it up a bit if you want more power, but longevity will suffer some.

Not at all, if you put in premium and make it a modest increase. Remember that the 780 Bertone Turbos made more horsepower (188hp vs.

165hp) by bumping the boost and requiring premium, no internal modifications at all.

Bill

The more power a given engine produces, the faster it will wear out, end of story. I didn't say longevity will be unacceptable, but increased boost creates more horsepower which puts more wear on engine and drivetrain components, period. That said, these motors are legendary in durability, so even with modestly higher boost they will probably outlast the car.

I've run 16 psi in my 240T for years, the motor has held up so far but I've broken a transmission, clutch, u-joints, and several engine mounts.

yes

Car is new to me.

When I bought it, there was NO boost.

Searched around a bit and found that the waste gate was disconnected from actuator .

Hooked it up, viola! We have boost.

jimB

It should never go into the red, unless you've fiddled with it. Cars made past '86 don't have red anyway, just yellow and in those full boost is about halfway into the yellow. You really need to hook up a calibrated gauge to have any useful information, no need to leave it installed, just tee it in and go for a drive, then you'll have an idea of what the needle position on the factory gauge represents.

This is very accurate information but I use synthetic oil so as to off set the wear and heat as well I rarely use the full boost but its nice to know its there if you need it .Make sure all your pipe and hoses are up to the task ...

Never say "never."

Mine goes into the red.

In fact, after reading your dismissive post I went out and WATCHED it go well into the red.

Not toward the end, but about half way in.

And I wasn't really thrashing it as hard as I could.

No detonation, either.

As for having fiddled with it: upgraded turbo, some head work, and a wider exhaust.

My 740 goes into the red, too.

I spot a trend.