another wastegate ????

[1 locomotive]

I have a 92 ctd witha 14 cm wastegated set for 22psi

I would like to get more boost I would like to change the compresser

to a stage 2 60mm ?? my ? if the wastgate opens at 22psi how or will a different h1c compressor change boost if the gate pops open at 22?

allso is boost the same as psi ??







92 ctd bosh 190 , pump tweaked a little ? looking to get my egt down when I pull a trailer , also bomb it somemore !!!!

thanks guys

 

[bgilbert]

With enough fuel you can blow right on past 22psi even with the wastegate open. You can have 70psi of boost with the little gate wide open :-laf . With the upgraded wheel or compressor housing you'll gain a cooler denser amount of air- boost. 22psi with stock turbo is not the same as 22psi with hybrid or bigger turbo. Yes boost = pressure/psi.



Have you ever checked for leaks in the intercooler and the rest of the intake/charge air system? You could be losing boost causing for higher egt's. The little turbo is doing its part, but that charge air might not efficiently make it to the intake.

 

[BushWakr - RIP]

The smaller (traditional) sized wasgegate diaphrams are a bit small... they suffer from what is called "boost creep". This is basically the initial opening of the wastegate and the progressive opening as the boost climbs, essentially dumping more and more boost as you climb in RPM and boost value. This means that you never really have the overall boost you need at any particular point to burn your fuel charge..... the larger diaphrams like the Banks "big head" are a better design. They hold until you are right on the money were you've set it... . so for example the smaller ones will start to open at your preset 22psi and continue to creep open until you reach a certain point... usually, say, 30-32psi. . then they're wide open.

(I think I explained that right... )

What happens is when you have a well fueled engine the boost climbs so fast that the overall boost exceeds the WG's ability to dump pressure and you end up with more boost than you've tried set as a max... the larger units do not have this problem, or certainly less of it.



Ok, if I got this bass ackwards someone will fix it for us ... right guys. .



Next, the H1 model compressor's don't usually have a relief groove cut in them and so they can be open to 'barking' the turbo as well as turbo flutter... not all guys have this problem but it does happen. The better choice is a true HX35 as your base unit for tweaking/modding.

The common pinwheels used in the HX models are the 58mm wheel and the 60mm wheel. The larger one is a tad slower to spool due to its size and slightly larger mass. In addition the larger mass also means you are approaching the limits for the shaft to withstand 'turbo stall' and still keep the shaft intact.

As an example, the HX40's use the same shaft as the HX35's... yet the '35's can take a whole wack of abuse and still keep on running... mine is a perfect example of that durability... .

The HX40's however really don't want to be spun over 40psi or so... after that, you can expect to suffer possible failure if you over boost them AND run them hot... .

JMO.....





pb...