Thread: 4BD1T Turbo Sizing and Performance Prediction.

Originally Posted by 85 county

Guys

I have attempted to post before and been poo pooed / shouted down etc.

will only talk in private because of that, i only contacted Vern because it was frustrating seeing someone lead up the garden path.

Genuine question still seeking an actual answer........

I have seen cases where turning the screw, say 1/4 turn, actually decreases power, but turning it a bit more increases power to more than the starting point.

Originally Posted by isuzurover

I have seen cases where turning the screw, say 1/4 turn, actually decreases power, but turning it a bit more increases power to more than the starting point.

What was the egt doing?

Originally Posted by Dougal

Genuine question still seeking an actual answer........

But dougal, you know every thing!!!

Originally Posted by Dougal

What was the egt doing?

No egt fitted to that one.

Will stuff around with it more tomorrow, but from what I have done,
fuel screw out 2 turns, boost up to 22psi and it is slower than when I had boost at around 15psi and fuel screw out 1.5turns, timing it from 0-100k was around 30seconds, takes off ok, not great, but ok, 4th-5th takes a fair while to get from 70-100.
I might take it for a spin and see what max speed I can get per gear on the governor.
Will also try a different boost gauge, and then try it on the other side of the intercooler.

Originally Posted by Vern

Will stuff around with it more tomorrow, but from what I have done,
fuel screw out 2 turns, boost up to 22psi and it is slower than when I had boost at around 15psi and fuel screw out 1.5turns, timing it from 0-100k was around 30seconds, takes off ok, not great, but ok, 4th-5th takes a fair while to get from 70-100.
I might take it for a spin and see what max speed I can get per gear on the governor.
Will also try a different boost gauge, and then try it on the other side of the intercooler.

That's 2.8 non turbo hilux speed.

This was me 4 years ago with a laggy boost compensator, no IC and restrictive intake piping:


Once you're done with the boost gauge on the other side of the IC, plug it into the exhaust manifold. Drive pressure will tell us a lot more.

*edit*
actually I think you should pop the wastegate arm free (zero boost) and go for a drive.

Not sure how I will plug it into the exhaust manifold without melting it
May need to invest in a digital boost gauge