The past couple of months have shown progress with tuning of the Shuenk IS38+ turbocharger.
Recent concerns on my part about the fuel rail pressure not meeting the requested levels prompted considering options to resolve this deviation.
Lowering boost pressure or upgrading the high pressure fuel pump (HPFP) were the two options being considered.
I went with upgrading the HPFP to be able to try and maximize the performance from the turbocharger. I chose the HPA fuel pump upgrade that would allow for a direct swap with the stock HPFP.
After installing the fuel pump, the fuel rail pressure results are what I was hoping for.
Results?
I received the pump 2 days ago. I need to get it installed and have a tune update sent before I’ll have results to post.
I have this pump. I would love to see what Jeff has to say about it.
Any result for this pump considering this and autotech
Not yet. The first pump HPA sent was not operating properly so it was returned. I have received the fixed pump back but have not yet installed it.
What was not working so others can know what to look for? Thanks.
Normally the HPFP will prime the line pressure before you try and start the engine, that way it starts right away. That wasn’t happening, I’d press the start button and for 4-5 seconds the engine would turn over before starting.
In operation when I did a WOT pull I was getting less fuel rail pressure than from the stock pump.
HI Jeff. do you go with HPA HPFP in order to push more the is38+ or this change is a must with turbo upgrade? Thanks
I intend to try a push the IS38+ a bit and I felt I should have some headroom on the fuel pressure in order to do that. I would have been able to be tuned around 26-27 psi without the HPFP upgrade.
Is your new hpa, working good now?
Yes, no problems with the pump since receiving it back from HPA.