theman4444

I searched and couldn't find this simple answer.

My question is what does your boost pressure read when at idle and at anything below 2000 rpm (meaning somewhat low idle). Is it at 0 mmHg or is it at -20 mmHg?

88t2romad

https://www.rx7club.com/search.php?searchid=1267207


you searched???

theman4444

Also, how easily does your turbo spin using your hand?

Wizz

Very easy.

88t2romad

very easy, right now i got one with a comp housing off, if i give it a spin, itll turn for about 1.5 seconds. Having problems??? Checked for shaft play?

theman4444

hmm well I thought I checked for ease of turnablility and shaft play and I thought I was good but I was thinking about it and I guess I need to check it more thoroughly.

When you spin your turbo does it take a little bit of pressure from your finger tips before it gives and spins or does it move from the slightest touch?

NZConvertible

The guage is calibrated in tens of mmHg, so "-20" is actually -200mmHg. It also doesn't have a full scale. Idle is between -350 and -450mmHg and cruising is around -250mmHg, so you won't see the gauge move off the bottom of the scale unless you're accelerating.

cds00bsmg

iTrader: (1)

it takes some pressure to move it, but spins relatively easy, its not going to move if you blow on it like a pin-wheel. If it makes some awful grinding sound, or has makes any friction type sounds, then thats not good, but its probably normal considering if the car has higher mileage, and etc. Check for foward-to-backward shaft movement, and up-and-down shaft movement. There should be little up and down to none, and little front and back to none. If there is excessive movement either way, and if there is a lot of friction type noise, look in to getting a rebuild, or upgrade, etc.

Whizbang

hmm. at 750 my idle is about -14 on my autometer. then over that its gets up to (well down) to -25 range while cruising.

theman4444

Thank you NZConvertible and cds00bsmg you guys answered my questions.

Oh and I believe my turbo is in exelent condition now. It only has 90,000 on it anyway.