Bootstrapping off Supercharged111's comments....
A couple other things to consider if you haven't:
- Change the Power Enrichment delay to 1s (I'm not sure what happens if it's set to 0, you can try that on your own)
- Change the PE enable thresholds to enable PE based on MAP and not, as from the factory, throttle position. Enabling PE at or around 6-8" of vacuum (6" of vacuum corresponds to MAP of 80, 8" of vacuum --> MAP of 73... at least at lower altitudes) works pretty well, and follows the old practice of enabling "power mode" on a carburetor at those vacuum levels.
- Play with disabling the EGR (I've seen this make a notable improvement in driveability on my own 1995 S10 Blazer VIN W)
Looks like our rigs are similar. I also hydroboosted my brakes. 1998 k1500 with the Vortec 5.7. Nothing crazy. Spider injector upgrade, electric fans, stock ECM. Adjusting the shift points, removing abuse mode and reducing torque management is a huge game changer. I don't go into OD until 58mph. I have no issue passing anyone. Removing Abuse mode and TQ management will make that easier. You hit the gas and your truck actually goes! Keep in mind, if you drive your truck hard (burnouts and stomping on it constantly driving it like you stole it) and you have a stock 4l60e, if you remove abuse mode and all of torque management, you are going to shorten the life of your transmission.
Abuse Mode: kill it entirely. It's stupid. It pulls timing for a certain time when you floor the thing and it perceives it's being abused.
Brake Torque Management: get rid of it. It kills torque all the time even when you're locked up in OD.
Torque reduction: keep it. It only pulls timing on upshifts.
There's a lot more to do in the tune than that, but I wanted to clarify these items as few actually understand what they do.
Bootstrapping off Supercharged111's comments....
A couple other things to consider if you haven't:
- Change the Power Enrichment delay to 1s (I'm not sure what happens if it's set to 0, you can try that on your own)
- Change the PE enable thresholds to enable PE based on MAP and not, as from the factory, throttle position. Enabling PE at or around 6-8" of vacuum (6" of vacuum corresponds to MAP of 80, 8" of vacuum --> MAP of 73... at least at lower altitudes) works pretty well, and follows the old practice of enabling "power mode" on a carburetor at those vacuum levels.
- Play with disabling the EGR (I've seen this make a notable improvement in driveability on my own 1995 S10 Blazer VIN W)
I'm gonna guess this is why my stock 97 hoe feels so damn anemic compared to my old 4.3 blazer. Guess I need to do the 411 swap and get me an HPTuners setup.