mnorton
Member
After a great deal of reading about all three of these topics and their interdependencies, I still need some clarification on a few points.
1. Why is a lower IQ number actually increasing the amount of fuel? My understanding is that the mg/str measurement is milligrams of fuel for every one stroke of the pump. In my mind, fewer mg of fuel is exactly that – less fuel for the same stroke.
2. Can adjusting the QA via the hammer mod allow small injectors to act like big injectors and visa versa? In other words, hammer the pump to greatly increase fuel delivery to my stock .170 nozzles until it’s hazy vs. hammer the pump to greatly reduce fuel delivery to my new .216 nozzles to reduce the smoke until it’s hazy. Having read about the “Evry mod” can I assume that there is much more to come with stock injectors? Maybe the crux of what I’m getting at is part of the magic (from a fuel perspective) within a Stage 1 tune on a stock engine?
3. Follow up to question 2, it is my understanding that larger nozzles can deliver “X” amount of fuel more quickly (earlier) than smaller injectors (takes a longer period of time to deliver the same “X” amount of fuel). I believe this helps to reduce exhaust gas temperature (EGT’s) because the fuel is burned sooner at the end of the compression stroke/beginning of the power stroke vs. later on in the power stroke. Am I correct in my thinking?
4. Is the IQ range within the VCDS software always the same (2.2 to 9.0) regardless of the position of the QA? For example, I’m at 3.9 with my stock nozzles. I install .216 nozzles and my IQ drops to 1.8 Will the VCDS actually show 1.8 or will it show 2.2 and only allow a change to say 3.0 at which time I will need to do the hammer mod to allow for an increased IQ which translates into less fuel for my larger nozzles?
5. How does the IQ range effect the output at wide open throttle (WOT)? Are the two independent of each other (less fuel at idle doesn’t mean less fuel at WOT – WOT fuel deliver is adjusted somewhere else) or is it a linear relationship (more fuel at idle = more fuel at WOT)? Is the answer to this question the same for QA?
Forgive me if these questions seem “newbie-ish”. I appreciate any insight that the community can provide.
Thank you.
1. Why is a lower IQ number actually increasing the amount of fuel? My understanding is that the mg/str measurement is milligrams of fuel for every one stroke of the pump. In my mind, fewer mg of fuel is exactly that – less fuel for the same stroke.
2. Can adjusting the QA via the hammer mod allow small injectors to act like big injectors and visa versa? In other words, hammer the pump to greatly increase fuel delivery to my stock .170 nozzles until it’s hazy vs. hammer the pump to greatly reduce fuel delivery to my new .216 nozzles to reduce the smoke until it’s hazy. Having read about the “Evry mod” can I assume that there is much more to come with stock injectors? Maybe the crux of what I’m getting at is part of the magic (from a fuel perspective) within a Stage 1 tune on a stock engine?
3. Follow up to question 2, it is my understanding that larger nozzles can deliver “X” amount of fuel more quickly (earlier) than smaller injectors (takes a longer period of time to deliver the same “X” amount of fuel). I believe this helps to reduce exhaust gas temperature (EGT’s) because the fuel is burned sooner at the end of the compression stroke/beginning of the power stroke vs. later on in the power stroke. Am I correct in my thinking?
4. Is the IQ range within the VCDS software always the same (2.2 to 9.0) regardless of the position of the QA? For example, I’m at 3.9 with my stock nozzles. I install .216 nozzles and my IQ drops to 1.8 Will the VCDS actually show 1.8 or will it show 2.2 and only allow a change to say 3.0 at which time I will need to do the hammer mod to allow for an increased IQ which translates into less fuel for my larger nozzles?
5. How does the IQ range effect the output at wide open throttle (WOT)? Are the two independent of each other (less fuel at idle doesn’t mean less fuel at WOT – WOT fuel deliver is adjusted somewhere else) or is it a linear relationship (more fuel at idle = more fuel at WOT)? Is the answer to this question the same for QA?
Forgive me if these questions seem “newbie-ish”. I appreciate any insight that the community can provide.
Thank you.