Thread: Boost pressure

If you wind the spring seat down(starwheel) further towards the bottom of the well, it will allow the max fuel to arrive at a lower boost, therefore earlier. I have heard of 20Psi with the wastegate disconnected as possible.


JC

[QUOTE=justinc;782328]If you wind the spring seat down(starwheel) further towards the bottom of the well, it will allow the max fuel to arrive at a lower boost, therefore earlier. I have heard of 20Psi with the wastegate disconnected as possible.


Shortly after purchase I adjusted the star wheel and moved the diaphragm/taper fuel control position to up the performance and I also altered the maximum boost pressure. Made real difference to performance with no affect on fuel econmy. My question comes from the fact that I had no way of knowing what the boost pressure is when the diaphragm is pushed onto its stop. The fact that it performs without smoking and retains its economy I dont think Im far away but I was just curious. I would add that disconecting waste gate is not a good idea. Anyway thanks for your response.
Regards Ray

[QUOTE=Silverone;782524]

Originally Posted by justinc

If you wind the spring seat down(starwheel) further towards the bottom of the well, it will allow the max fuel to arrive at a lower boost, therefore earlier. I have heard of 20Psi with the wastegate disconnected as possible.


Shortly after purchase I adjusted the star wheel and moved the diaphragm/taper fuel control position to up the performance and I also altered the maximum boost pressure. Made real difference to performance with no affect on fuel econmy. My question comes from the fact that I had no way of knowing what the boost pressure is when the diaphragm is pushed onto its stop. The fact that it performs without smoking and retains its economy I dont think Im far away but I was just curious. I would add that disconecting waste gate is not a good idea. Anyway thanks for your response.
Regards Ray

Thats why I set these up with a boost gauge and Pyrometer. NO Tdi adjustments of that magnitude should be done without these tools. I have disconnected the wastegate on my Isuzu, because max boost on any diesel engine is mostly fuel dependent, therefore less fuel = less boost, and if you set the system up with or without a wastegate using a pyro and boost gauge, keeping its output to reasonable levels, then it won't do any damage.

As for the Tdi,I wouldn't bother disconnecting a wastegate on a Tdi unless you want to extract more than 18PSI from one, as the rod won't adjust any further 've found. (This engine is running 19psi, a bigger IC and exhaust, stock turbo and gets to 650deg upstream up hills)

JC

[QUOTE=justinc;782930]

Originally Posted by Silverone

Thats why I set these up with a boost gauge and Pyrometer. NO Tdi adjustments of that magnitude should be done without these tools. I have disconnected the wastegate on my Isuzu, because max boost on any diesel engine is mostly fuel dependent, therefore less fuel = less boost, and if you set the system up with or without a wastegate using a pyro and boost gauge, keeping its output to reasonable levels, then it won't do any damage.

As for the Tdi,I wouldn't bother disconnecting a wastegate on a Tdi unless you want to extract more than 18PSI from one, as the rod won't adjust any further 've found. (This engine is running 19psi, a bigger IC and exhaust, stock turbo and gets to 650deg upstream up hills)

JC

I have boost and pyrometer on board. Have adjusted my boost to 18psi, mine can go far higher than that on rod adjustment, also I bring the initial boost in at lower revs. My question was brought about by the feeling that the maximum fuel from the boost side of the system was coming in before maximum pressure was reached. I was just curious, I may have figured out a way to establish if Im right or wrong.
Regards Ray

[QUOTE=Silverone;783126]

Originally Posted by justinc

I have boost and pyrometer on board. Have adjusted my boost to 18psi, mine can go far higher than that on rod adjustment, also I bring the initial boost in at lower revs. My question was brought about by the feeling that the maximum fuel from the boost side of the system was coming in before maximum pressure was reached. I was just curious, I may have figured out a way to establish if Im right or wrong.
Regards Ray

Ahh, Can you give me a call at work? 0408 995 635 I would like to chat about this..

JC