Hey Guys,

Is there a formula when changing injectors to follow so that I may just edit the constant, rather than doing that along with tons of ve changes - or ?

I.e, I'm running some SV0 24lbs injectors right now and I'm at like 90% DC under boost with like 65psi of fuel pressure, so naturally i'm thinking of going with 30s or 36 pounders..

Right now my inj constant is set to 24.0 and I tuned VE to match everywhere (I hate having like 24lbs injectors, and the constant be like 22.6 or something like that).

So .. What do you think?

 

I went from 24lb SVOs to 30lb SVOs and didn't have to do hardly any VE changes. I'm not sure if this is universal or not. But, I didn't have to do many ... yes, there were some small adjustments, but it was pretty plug and play. So, for me SVO-to-SVO was pretty easy.

I actually saw what you saw ... 90% or so on the 24lb SVOs. After the swap it jumped down to 77% on the 30lb SVOs (with a 33lb constant). Current configuration gives me 82% DCs.

Tim

 

Cool. So your constatn is 33 with the 30's. What was the constant with the 24s ? 27?

I think I can go faster with a little more fuel..

-- Joe

 

Joe,

Honestly, I don't think you are going to go any faster with the 30's. Your 24's still have plenty of room left on them. The ONLY reason I upgraded from 24's is because ....

I had 22lb in my motor
My injector DCs were Crazy high
I upgraded to 24lb SVOs expecting to see very low DCs
I checked the DCs and they were 90%+
I had those injectors in my car for literally 1.5hrs.
I took them out and exchanged them for 30s
I did this ONLY because my original goal was to get very low DCs
The 24's would have worked fine. I was just determined to get very low DCs.

I think I used a 26lb constant with the 24's.

Tim

 

I don't have a wide band o2, or any dyno time so I have absolutely no idea how my car is WOT under full boost. All I know is, its at like 90% dc.

I need some dyno time ..

-- Joe

 

Exactly - you need some WB dyno time. Don't replace the injectors unless you are SURE that you need to replace them. Get proof for each mod that you "need" to do.

Tim