what revs does your 964 turbos boost kick in

Guest · Feb 13, 2005

what revs does everyones boost start kick in on their 1991-1992 964 turbo, eg to show on the boost digital gauge and what revs do you acheive maximum boost

Ian Donkin · Feb 23, 2005

Fourth gear, up hill to create plenty of load, fully open throttle from 1,000rpm - 0.1 bar registers around 1600rpm, 0.7 bar (maximum the boost gauge sender knows about) by 2,600rpm.

All starts to happen very quickly from there onwards!

Guest · Feb 23, 2005

i must have a leak then as i start registering around 2800 and full around 3.5-4k ill check it again but its definitely not at 0.7 bat at 2600 revs that must be some power

Ian Donkin · Feb 24, 2005

Remember the figures I quoted are in a high gear under load; if I repeat the exercise in 2nd gear I don't see anywhere near the same results - the revs rise so quickly that it becomes difficult to make anything meaningful of the boost levels.

A good example to prove this is that I had a leaking pipe from the turbo to intercooler that presented itself as an unwillingness to pull hard in 4th gear a little above the national speed limit and 0.4 bar pressure yet in second it would wind round to the limiter and display 0.7 bar all day.

I note from another post that you also have a Heyward and Scott exhaust - mine is absolutely stock apart from a zucz powerflow inlet tract and air filter that a PO fitted. Maybe the H&S has different characteristics.

Guest · Feb 27, 2005

ok took it for a drive today and got full 0.7 bar boost at 2900- 3000 revs in 2nd gear
i do have a haywad and scott exhaust had alook at it on the ramp todayand both manifolds have seperate pipes which join together directly at the turbo

Ian Donkin · Mar 1, 2005

You need to carry out the test in 4th gear to get any meaningful results. 1,000 rpm, full throttle, watch the boost gauge.

As I posted earlier, it don't mean a whole lot in 2nd.