How much boost?

[Monomer]

Can a w124 602 take?



It's pegging at 14.5psi now, with the alda adjustment 1 turn from stock. Thats 14.5psi going 85MPH with 3000RPM.

[Brian Carlton]

It can certainly "take" 14.5 psi.

Whether that much boost is actually doing anything is the real question. I've found that anything above 12 psi on the 617 is basically useless. I can't be sure if this is true on the 602, but, I would suspect that it might be.

[Monomer]

Originally Posted by Brian Carlton

It can certainly "take" 14.5 psi.

Whether that much boost is actually doing anything is the real question. I've found that anything above 12 psi on the 617 is basically useless. I can't be sure if this is true on the 602, but, I would suspect that it might be.

It's not spooling until 2800rpm, really.

anything under that it gets around 2psi of boost.

[Brian Carlton]

Originally Posted by Monomer

It's not spooling until 2800rpm, really.

anything under that it gets around 2psi of boost.

Well, that might be typical of the 602.

I'm referring to the max. boost of 14.5 where the wastegate opens. That figure seems to be more than required, but, it won't hurt anything.

[Monomer]

Originally Posted by Brian Carlton

Well, that might be typical of the 602.

I'm referring to the max. boost of 14.5 where the wastegate opens. That figure seems to be more than required, but, it won't hurt anything.

That's what I needed to know.


Thanks, Brian.

[Mitch H]

The older ones shut off the ALDA if boost hit about 1.1 to 1.2 BAR, that might give you a clue. I don't know if the overboost protection kicks in at the same place on a 90-93 or not.

[babymog]

I might be reading this wrong, but if you're running 14.5psi boost to maintain 85mph on level ground you've got a problem. You should only see max. boost of 10.5psi under full-acceleration above around 3000rpm and 85mph should be less than 1/2 throttle to maintain.

Originally Posted by Monomer

Can a w124 602 take?



It's pegging at 14.5psi now, with the alda adjustment 1 turn from stock. Thats 14.5psi going 85MPH with 3000RPM.

[Monomer]

Originally Posted by babymog

I might be reading this wrong, but if you're running 14.5psi boost to maintain 85mph on level ground you've got a problem. You should only see max. boost of 10.5psi under full-acceleration above around 3000rpm and 85mph should be less than 1/2 throttle to maintain.

That's near flooring it, it's peak was 14.5


it may have been uphill, I forget. My father was reading the boost gauge to me - as it's not mounted yet.