Boost Pressure drop off ?

overspent · 13th April 2006, 11:46 PM

Boost tail off at 4,000rpm

Can anyone help me?

I get a drop in boost pressure once I get to 4000rpm it climbs fine till I get to this point then from 1.25 it drops to approx 1.1 and from 1.5 it drops to 1.3. There is no significant drop when the EVC5 is switched off.

I am running stage 3 hybrids and it has been suggested that the actuators may be at fault ? ? ? ? However if this is the case where can I get some new ones, Toyota only sell them with new turbos (no go on that one) and have had no success from any other sources.

Your thoughts please guys.

Martin F · 14th April 2006, 09:52 AM

Does the boost then climb again once it has dropped off?

Usually these sorts of thingsare, as you say, related to slow actuation but most of the time that is due to a split hose or sometimes one that has come off.

How is your EVC actuator plumbed in?

Cuthbert · 14th April 2006, 08:19 PM

I may possibly have a spare set of actuators if you need them.

13th April 2006, 11:46 PM	#1
overspent Older but no brighter Jap Spec RZ - Manual (TT) Join Date: Feb 2004 Location: Reading, Berks Posts: 83	Boost Pressure drop off ? Boost tail off at 4,000rpm Can anyone help me? I get a drop in boost pressure once I get to 4000rpm it climbs fine till I get to this point then from 1.25 it drops to approx 1.1 and from 1.5 it drops to 1.3. There is no significant drop when the EVC5 is switched off. I am running stage 3 hybrids and it has been suggested that the actuators may be at fault ? ? ? ? However if this is the case where can I get some new ones, Toyota only sell them with new turbos (no go on that one) and have had no success from any other sources. Your thoughts please guys. __________________ '96 Gunmetal TT6 Facelift '97 Jaguar 3.2 Sport 455bhp 420lbft @ 1.45 bar at HyperSR Dyno Dynamics

14th April 2006, 09:52 AM	#2
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Does the boost then climb again once it has dropped off? Usually these sorts of thingsare, as you say, related to slow actuation but most of the time that is due to a split hose or sometimes one that has come off. How is your EVC actuator plumbed in? __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

14th April 2006, 08:19 PM	#3
Cuthbert Old Timer UK Spec - Auto Join Date: Sep 2004 Location: dorset Posts: 1,880	I may possibly have a spare set of actuators if you need them. __________________ Cuth. "Beer is proof that God loves us & wants us to be happy" - Benjamin Franklin "Badger beer is the best" - God

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