"Prototype" Super Phat Shaft 62!!!

[JStieger]

Has my parts people called you with your test results?

No calls yet! I wasn't figuring on anything until early next week.

 

[JStieger]

TST dynos in general?

This was asked of me on DTR, but I thought it was interesting to share. It's about virtually all the TST graphs I've seen on here that have that funky "dip" around 2000 rpm or so. Anyone have any thoughts on that? TST programming or rail pressure trying to keep up? Dyno type (Mustang versus Dynojet)? Because I definitely do not feel that dip when driving - it's just pure slam you back in the seat! Here's the question followed by my response:

Originally Posted by realsquash

So the rail went way high, eh? No pressure box? Was it high the whole time or just at a certain RPM? What's up with the dip at 2000 rpm? It's present in all the graphs.



Thanks for posting that data, very interesting!



Andy

Andy-



Very good eyes you got! Correct - no pressure box. I have a theory that with big injectors the ECM would up the fuel pressure due to shorter duration to output the same amount of fuel as a stock type injector under similar circumstances. This in effect is the same thing has advancing the injection timing. When I ran a MP-8 stacked with his TST you could hear his happening under normal conditions so I didn't want to have things happening too aggressively with 2 aggressive boxes! I felt that this would make the power really peaky too.



The rail pressure looked to spike on the gauge in the 2000-2500 rpm range and then it is all downhill from there.



As far as that 2000 rpm blip I have noticed that in practically every TST dyno posted. Some are not at 2000 rpm and could be at 2100 rpm. I guess that depends on the truck. Weird ju-ju going on!