I believe that is part of the reason Toyota uses both on an engine or 2. DI for the cooling and higher compression potential. Port injection to clean the valves and something about being better at idle or something.

 

PM me if you need help..

 

Resurrecting my dead thread.

If anyone wants to see the latest pictures of my setup, click the following link: LNF Engine Lab Setup. That gallery is about 2 months behind where I am currently at. I have all the pictures I just haven't made time to upload them yet.

 

That's some crazy stuff!

 

Yay CNG

Are you using temp & pressure sensors on the CNG rail to compensate fueling?

Also your dyno setup would never fly at an OEM or tier 1 test lab, I really hope you have shielding around the engine in case anything breaks loose (as it looks like you are in the same lab as the engine; hopefully you are out of the room). You really don't want to screw around with safety & running engine, especially running CNG where mega-knock can quickly break things apart.

Also, not sure how much CNG use you are using under boost, I'm surprised you are only running a 100 psi regulator. For reference the NGI2 are good up to 11.5 barA which is what is run on the 5.7 CNG HEMI.

 

lI understand that Subaru have an engine that uses both port and direct Injection,to tackle this very issue of carbon buildup on the back of the Intake valve. We are living in very exciting times !

 

OEM's are switching to PFI+DI for emissions and fuel economy only, you'll see it in all the majors oems (FMC, GM, Honda, VW, etc.) within the next 5 years. CAFE 2025 people!

edit: MasterAppliance, nice test setup! CNG is some pretty fun stuff. If you ever feel like you need more from a development controller, let me know

 

No more coking on the valves..

 

I think the coolest part is (for the aftermarket) is how easily you can upgrade the PFI injectors, but still get the performance benefits of DI. Best of both worlds really

 

If the lnf was rwd or awd I would see the point in adding PFI injectors to support larger turbos on e85

 

sub'd

 

Sub'ed why?


I have the ability to do this and a bunch of master tuners advised against it as there is no true need without huge power.

 

Because I'm considering whether it might make sense to use this approach in my application, and because the OP's website only has pictures right now, and I hope to see his thesis when it's done.

Why was my subscription removed?