Yet another GMC build

[dsraven]

Hydroboost is awesome.

[6DoF]

hydroboost feels different for sure ... but it's like putting an 6-71 blower on your brake booster! having the stopping power of a rig built to drive around at 12,000gvw, but only rolling 4000, works out reeaaalll nice

[dsraven]

AND, its the same all the time unless the engine dies or you blow a hydraulic hose, then you have one boosted brake application before the manual brake feel comes back.

[OKGMC4]

I was car 454 at the track today. Wanted to see how it went with a new set of drag radials on the rear. Best time was 11.7 and I am happy about that.

[6DoF]

NICE!! hard to complain about a solid 11sec truck!

having issues anywhere, or anything you'd change to try for faster?

[OKGMC4]

Originally Posted by 6DoF

NICE!! hard to complain about a solid 11sec truck!

having issues anywhere, or anything you'd change to try for faster?

Could go with a stall converter but the radials might not hold anymore. Could also try more timing or boost with E85 but I like running pump gas and also drag radials might not hold. It would either hook or spin a half turn and go. Just about perfect. The Nittos are expensive but work. Plus, because the tech guy passed me without even looking under hood, I was later warned that if I get faster than 11.5 they will require a roll bar installed. Not sure I want that. Yet. Still would like to make it work on a road course. But I need more brakes, lower in the rear which means frame mods, and track tires. How cool would it be to go track with a bunch of Corvettes and BMWs in an ancient pickup truck?

[6DoF]

ooooo, i always forget that 11.5 is the breakover ... 11.7 is fawkin MINT!

the cornering game can be a deep hole too. moving weight, alignment adjustments, getting springs/shocks/bars tuned just right. worth it.

[Kevin_C]

Thats awsome. I live down the road from New England dragway. Hoping to run mine down the track next year.

[OKGMC4]

Originally Posted by Kevin_C

Thats awsome. I live down the road from New England dragway. Hoping to run mine down the track next year.

Can’t wait to see the time slip!

[OKGMC4]

Want to start improving handling. The truck understeers pretty badly on turn in and I think it is partially due to the rear sitting 2.5” higher than the front. I’m going to make some changes to attempt to fix it.

[OKGMC4]

I'm also going to have to raise the gas tank a bit, and cut the pretty bed floor, and probably modify the exhaust some more. The toe rods need to be relocated downward. Definitely going to go more aggressive on wheel alignment and tires. Looking to move from 275/40r18 to 295/35r18 in a stickier compound. Lots to do.

[6DoF]

my wife's base C7 always pushed bad into corners when we'd go play at the low-key autocross, turns out it just needed a rear sway bar. the base car comes with the lightest front bar and no rear bar. at the suggestion of a guy who races them and did a whole comparison study on what worked well together, we got the stiffest rear bar. made a significant change for the better.