So, I am having throttle/tuning issue's with the Edelbrock E-Force supercharger that i installed on my 2004 Cadillac CTS-V, with the stock LS6. Here's what I have so far:
- Converted from 78mm Throttle body to 90mm throttle body using the Caspers harness
- Removed the MAF and installed a 2 BAR SD tune
- Set the correct injector data (Deka sort height, 60lbs)
Total Mods:
- 2300 TVS supercharger with 3.25" pulley (good to 10 PSI)
- Kooks long tube headers (1 7/8") with tuning pipes at the moment.
- DW 300 fuel pump
- stock LS6 cam with .625" valve springs and hardened push rods
The two main problems that I have is that the engine seems to buck pretty bad right at 1500 - 2000 RPM's (feels almost like a dead miss although I know there isn't a miss), and the throttle seems to be really slow to react, somewhat of a delayed reaction. I am wondering if the 90mm throttle body may be opening too much too fast in comparison to the 78mm that it replaced. It almost feels like the throttle and the boost actuator which is vacuum sourced may be pushing/pulling each other, if that makes sense. I played around with a few things, raising the Stoich to 14.4221 seemed to help marginally at first, although this was short lived.
Not really sure if this is a tuning issue or a throttle issue as most of my issues thusfar have been with the throttle (P0068, etc). I ended up turning off the P0068 DTC until I can get the VE dialed in, then go back and reset it.
Anyhow, after the 2000 RPM mark it clears right up and is fine. Its just a low rpm (lugging) issue.
Appreciate any assistance!