92BLKL98

I'm just getting into DIY EFI. I have installed a set of SVO 24# injectors in my L98 Z28. Should I set the Injector constant at 24? I understand that Ford injectors are rated at 39 psi FP and GM uses 43.5 psi which would give me an approx. equivelant to 25.5# constant? Also, I've been running my FP at 48 psi which would push the injector rating to an even higher approx 27# I believe. And, would it be better for tuning to adjust the FP back to 43.5 psi with no vac to the regulator and set the Inj constant to 25.5?

doc

I'd keep the FP at 48psi, and set the injector constant at 25.0...
Drive the car and run scans, if the BLMs go above 128, then you should lower the injector constant on the next Eprom.. Do the opposite if the BLMs go below 128. The idea is to find an injector constant that gets most of the fuel trim cells to 128 during part throotle driving.

3.8TransAM

Ford 24# are = to GM 24#

I know this, I run them :-) Stock or very enar to stock with stock FP set the InjC to 24# and leave it alone and tune from there.

If u raised it to 48psi or more FP than u might want to revise it a little bit by say 1 or 2 like u suggested.

Later
Jeremy

92BLKL98

Hey, thanks for the info guys. I'll try the constant at 25 and with datalogging we'll see what happens. I'm using TunerproRT for most of my work but I've also been trying the demo version of Datamaster. I recently installed the Zeitronics zt-2 WBO2 with EGT. I don't have a deficit in the datalogging dept. I just need to see what suits my needs best. I'm trying to see what seems to be normal for EGT right now but the injector constant has been kind of nagging due to WB AFR info vs. BLM's not in agreement. I plan to spend a bit of time this weekend datalogging and working on my .bin. So far the car seems to run pretty good but I think even for a stock long block it has a little more in it.

JP84Z430HP

Check out this thread if you haven't already.....

https://www.thirdgen.org/techbb2/sho...hreadid=253972