boost problems

[threedogs]

had nothing but boost problems ever since I had my alternator changed on my 5/04 series 3 T/D 3 ltr auto. error showed crank position sensor U/S. Replaced but boost all over the shop, fitted Dawes,blocked EGR even replaced Maf this morning. No difference. Then looked at how alternator is removed, noticed the air pipe/hose going into turbo is loose. tried to tighten but those wire style clamps are rubbish. will replace clamp and see how it goes.

[mudski]

So what are you trying to tell us? The clamps are shite? If you fitted the Dawes and needle valve and it made no difference you must have fitted it incorrectly. Thats what they are used for...
Check all your hoses for leaks. And the IC too.

[threedogs]

pretty sure dawes is fitted correctly, boost only goes to 14psi now not 25+ like before. thinking it must be leaking, last truck was a 350 chev powered troopy 75s, don't like these computer trucks at all. the dawes is fitted with the tee inbetween that round job near turbo and air meter the other end tees into the boost guage line. no needle valve fitted

[mudski]

Yeah sounds like its right.

[threedogs]

buying one of those 1" wide hose clamps, not saying it will fix it but one less thing to check, truck still seems to choof along ok. Sits at 10psi at 2000rpm and temps are around 315 deg c.

[mudski]

buying one of those 1" wide hose clamps, not saying it will fix it but one less thing to check, truck still seems to choof along ok. Sits at 10psi at 2000rpm and temps are around 315 deg c.

Where in Melbourne are you. I used to work for a mob who import Silicone hose (the real stuff for trucks) and the real deal hose clamps that NEVER come undone under pressure. They are in Oakleigh. The clamps are a bit pricey but they are worth the coin.
My max psi is 16, and my EGTs haven't gone over 350c with a boot full. Gutting the cat was the best thing ever.

[threedogs]

my truck has straight through cat, 3" exh. DP chip on 6, temps get up with the boot in up to 500 deg C . cruising temps are down. 315 not sure if you can replace this hose but will have another look. my local bearing shop in Airport west sell gates clamps. hopefully it's sucking air from loose hose or something simple. also doing fuel run at the moment. it's a 3lt auto 04 once boost is controlled better I'll stretch spring in Dawes to get psi up a bit more.

[mudski]

O.k. Gates was one of the products I used to wholesale. Get the constant torque clamps, or if you can find them the t-bolt type clamps but the ones with the spring on the bolt section. So when you tighten up the nut it compress' the spring down so it will never come loose.
See this link for the Constant torque clamps :
http://www.spareco.com.au/CLAMPS/AUT...-CLAMPS/pl.php
See this link for the spring loaded t-bolt clamps :
http://www.spareco.com.au/CLAMPS/AUT...-CLAMPS/pl.php

Hope this helps.

Actually you kind of reminded me that I need to get better clamps for my truck too.

[threedogs]

Thanks Mudski, emailed them for pricing. exactely what I was looking for, factory clamps are useless as they cut the hose when you tighten them. hopefully fit them today and see how the boost goes. Will also replace that piece of hose with some silicon hose if I can at the same time.

[threedogs]

fitted the Gates hose clamp, no difference only now under hard throttle it stops till you lift your foot. looks like I have an error. bugger. selling a Hilux single cab camper to finance turning the turbo from vacuum to pressure. Costs around $700. I;ll persist trying different things but think its a lost cause. I HATE COMPUTERS WITH A PASSION.