Al Z

Hello
I have a friend that is looking into a 87' 930. I drove the car, very nice. What kind of boost should I be seeing on the gauge, and also at what rpm. How can I check to see it is getting the correct boost. Any thing else he should check for? Thanks in advance.

Red Rocket

I have an 87 that in stock form is 0.8 bar (its not stock anymore) rpm not sure

Brent 930

Full boost will be around 4500 rpm's. If I remember correctly only when my car was stock did I get an accurate reading from the built in boost gauge (I think). The problem is the sensor is before the thottle plate. If your friend likes the car then have a mechanic check it out before he buys.

Sameer

0.8 bar at full throtle

Al Z

Would you see full boost in any gear?

Sameer

Yes in all gears.

Brent 930

I never see it in 1st but that's OK by me since I don't need it.

Dan89_930

I rarely got full boost in first. The gearing had me getting to red-line so fast that full boost was rare. The rest of the gears - absolutely.

An inexpensive (relatively) way to lower the RPM at which the turbo spools is to buy an after-market header / muffler set up. I'm sure the Rennlisters reading will chime in with their recommendations.

Dan
'89 930 3.4 (recently sold)

ZCAT3

Not to mention that the stock boost gauges are notoriously inaccurate. I have a digital boost controller in my car and it gives me very accurate readings. It will be reading around .5 - .6 bar when the stock gauage is reading 1 bar.