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1991 Pontiac Firebird Formula - Dyno Diagnosis, TPI Style

What do you do when the strip numbers don't jibe with the hardware?

Photography by Terry McGean
TEST 1
TEST 2
RPM TQ HP TQ HP
3600 217 148    
3700 246 169    
3800 270 195    
3900 283 210    
4000 287 219    
4100 282 220    
4200 277 222 260 207
4300 266 218 262 216
4400 260 219 262 219
4500 257 220 260 223
4600 253 222 257 226
4700 250 224 253 227
4800 245 225 250 228
4900 240 224 241 226
5000 233 222 233 222
5100     223 217
TRACK ACTION
TUNE
TIME
(corrected)
60-foot
TRAP
(mph-corrected)
Bone-stock 14.51 2.20
94.3
SLP runners, headers, Cat-Back, cold-air 14.19 2.15
95.90
10-inch 3,000-stall converter 14.12 1.98
92.43
3.73:1 gears in place of 3.23:1 14.13 1.88
93.20
Nitrous plate, 150hp shot 12.95 1.79
105.01
STICKER SHOCK
DESCRIPTION PN SOURCE PRICE
Adjustable fuel-pressure regulator 1714 BBK
$59.95
Beehive valvespring kit 982 Comp Cams
$126.39
Valvespring compressor GP4930 Powerhouse
$133.39
Roller rockers, 1.6:1 ratio 1318-16 Comp Cams
$324.95
Valve seals N/A B&C Auto
$21.95
Sub total    
$666.63
Previous total    
$7,275.12
Just-as-slow total    
$7,941.75
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