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Analyze Data and Increase Boost

7:29
21:36
101.5K views

At 7:29 in

Turbo LS '95 Chevy: Grandpa's Former Daily Driver Turns Into Drag Truck! (Test Hits with a Dragy)

What happens here

The driver uses a laptop and a Dragy device (a GPS-based performance meter) to analyze the data from the recent low-boost run. The Dragy recorded a 60-foot time of 1.79 seconds. This confirms the truck's baseline performance. The team decides to increase the boost by 'pinning' the 3-port MAC valve, which effectively bypasses the wastegate's control system and directs maximum available exhaust gas to the turbocharger, aiming for higher boost levels (estimated around 17-18 PSI) for the next run.

Goal: Review performance data and prepare for higher boost testing.

Tools and materials

  • 3-Port MAC Valve — Controlling boost pressure (to be 'pinned' for max boost)
  • Dragy GPS Performance Meter Dragy — Measuring 0-60 mph, 1/8 mile, and 1/4 mile times and speeds
  • Laptop Dell — Viewing engine tuning data and Dragy results

What they say

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like my estimation and draggy and lots of experience running the truck it's pretty much really close so what are you gonna put in it now um basically i'm just gonna go straight to double so i'm gonna just pin the three-port mac at whatever it makes so like probably high teens 17 18 you see do it whatever it makes it makes if it dies he dies so you laugh but i literally said that about five times in my last race because i drew a really really fast guy at the snow prep and i had no clue what i was going to do to beat him other than go as fast as i could so like i swapped some things around and i basically turned my freeport mac valve into a check valve so the wastegate has a top and bottom port while i pulled the bottom port so there was nothing to helping the gate open and then i plumbed the top port directly to the dome so all the boost was going through the dome nothing was helping it open and it made like 30 pounds on the trans brake so like i moved about that far my map sensor was pinned it was maxed out it's pretty much a hundred percent through all the places that's a throttle position an rpm graph and that's duty cycle to the mac valve so it's 100 basically everywhere 100 percent it give it one hundred hundred it's about to start raining we gotta get this rip in we're gonna hold up in the rain i'm gonna leave the rest of the rain we gotta descend and turn in the rain

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