Injection Timing

[OhioRiverCigarette]

I am trying to learn what the programmers and chips do. I have two questions.

First Question:

I have learned a little about injection timing. When is the fuel injected by stock programming?

Do the performance programming inject fuel on the upstroke to allow fuel to combust earlier? Is this like running advanced ignition timing in a gaser?

Would early fuel ignition increase cylinder pressures? What is the limit to how early?

Second Queston:

Do performance programers/chips increase fuel flow through longer "open" durations? If so what is the maximum fuel= horse power a chip could give? Some seem to claim 140 HP from a chip with only performance exhuast and air filter. Is 140 horsepower realistic? If so how safe is it?

[binder man]

I cans answer one positively and that is, is 140 realistic and the answer is no. With stock injectors I think about 80 over is realistic or 300-315...do you have a auto or manual?

[OhioRiverCigarette]

I have any auto. I was told the stock trans would hold to ~400HP.

[binder man]

I wouldn't push it. there have been many people toast it with a chip....Especially non custom tuned ones such as edge, and TS

[TurboSevenThree]

Originally Posted by OhioRiverCigarette

I have any auto. I was told the stock trans would hold to ~400HP.

I wouldn't wanna try running that for long unless I had money in the bank to replace it. And for your questions I don't know durations but you need to keep in mind to figure out the answers that our injectors are oil pressure driven. So something like an Edge bumps up the oil pressure through the pcm to increase power. (SAME AS THE RESISTOR MOD, only difference is you get to monitor a bunch of extra crap and get smooth idle.)