Strip Testing - Turbo Buick Basics, Part 9

Strip testing the safe street tune (18 psi of boost) from Part 8 and new suspension/traction aids

Dan Foley Feb 14, 2012 0 Comment(s)
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If you have been following our "Turbo Buick Basics" series then you know that, like any project, we've had our challenges. But at long last it is starting to come around. While still on low boost (18psi) the time had come to strip test our buddy Tim Cairone's Grand National. Tim was delighted that the GN had never ran so well or felt so powerful. Yet all this power meant that we'd need some way to contain it. Enter a set of components from G Body Parts and UMI Performance. While thrashing to get the test done before Atco Raceway closed for the winter, G Body managed to get us a set of air bags shipped out that would allow us to dial-in the rear with some preload and add some bite. Meanwhile UMI Performance's Lift Bar Set-Up was on the way for part two of the strip test, which would improve the suspension geometry and eliminate any lower control arm flex or deflection. And since we also had a set of 27x10.5-inch slicks lying around, we decided to throw them into the mix in our quest for better traction. Follow along to see what happened.

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Dyno And Dragstrip Results

Mods

HP

TQ

60-FT

E.T.

MPH

Stock, 13 psi 208 @ 4000 256 @3000 2.10 14.25 95.53
Chip, 17 psi 210 @ 4000 320 @ 3000
Valvesprings, fuel pump, hotwire 238 @ 4100 358 @ 3000
42-lb Injectors, chip, 19psi 240 @ 4000 405 @ 3000 2.10 13.63 100.55
High-flow exhaust 276 @ 4000 440 @ 3000
58mm turbo, 20psi 303 @ 4500 440 @ 3500 2.31 13.50 104.68
3-in. downpipe, boost controller 303 @ 4500 450 @ 3000
ADPP, ported throttle body 325 @ 4500 446 @ 3000 (Trans Failure)
Rebuilt trans, 2800 stall converter 289 @ 4500 465 @ 3100 1.65 12.28 108.11
Roller cam, ported heads, headers, 17psi 339 @ 4000 465 @ 3800
62 turbo, hi-flow intercooler ends, 20psi 372 @ 4800 515 @ 3500 1.97 12.28 112.34
Chip, port turbo, w/g puck, tune, 18psi 365 @ 4700 554 @ 3400
Air bags, lower control arms 365 @ 4700 554 @ 3400 1.55 11.41 117.94

Since we had a set of 27x10.5-inch slicks lying around, we figured we'd give them a shot and see if we could hit a 1.50 short-time with a larger footprint. Unfortunately the taller tire appeared to kill some of the gear and slowed down the turbo spool-up, anchoring it to a 1.71 short-time and a best of 11.70 at 117mph. Perhaps a looser converter might have been a better match to the taller tire. We plan to make a few more changes over the winter and crank up the boost come spring time, so stay tuned.

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