1986 Buick Grand National
No longer mine but I couldn't be happier how my Godson is taking it to the next level.
Due to the ongoing (and messy) work in my shop I recently sold my GN to my godson.
Here's Sean at the Buick - Ford Shootout 17 Oct, 2009
This is the license plate frame I had on both my Buick GN and my Pontiac Turbo Trans Am
This is what I've done to my car by porting the stock turbo, adding the larger intercooler neck and a few other airflow improving mods. In my opinion, there were a lot of built in restrictions in these cars as they came from the factory and it's been a interesting to me to find these bottlenecks and remove them.
Sometimes I would do something that seemed as though it would make a bit of improvement only to find out at the dragstrip that it didn't help at all. After not too many of these disappointments I realized that if something were improved upstream, a corresponding improvement would need to be made downstream on the engine. A friend calls this "Chasing the cork." An added benefit is that the horsepower increase hasn't placed the extra burden on the engine that pumping more air in with a larger turbo would do. In over 200 1/4 mile passes, I have never had a head gasket failure or any kind of motor damage.
Reading the list of parts below may be misleading to some extent unless it's kept in mind that some of the parts were installed with future upgrades in mind. They're not all necessary to get a Turbo Buick into the low 12s. If your plans are to improve the performance of a Turbo Regal, I'd like to first congratulate you on your choice of cars and hope that the experience returns as much fun for you as it has for me.
Best 60ft: 1.62
Best 1/8: 7.62
Best 1/8 mph: 90.54
Best 1/4: 11.98
Best 1/4 mph: 113.46
Altitude Corrected 1/4 Mile - 11.80 @ 115. 24
Rear Wheel Horsepower - 430
Flywheel HP - 538
Awards and/or Trophies received
55 Show awards (1 best of show)
Injectors: #36lb (Blue Tops)
Converter: Transcrafters Orange Stripe
Chips by Red Armstrong
Or Sometimes I made my own using a Pocket Programmer
Intercooler: Modified Neck Stock
Engine internals: The only modification to the engine was installation of 100# valve springs
Gauges: Digital EGT w / hold, GNX dash, Caspers knock detector, Trans Temp gage.
Exhaust: Hooker 2.5" Duals
Boost control: Adj. Stock
Special Notes: Car has all options except digital dash,
rear def. & block heater.
Postons Ceramic Coated Headers Installed Nov, 99
Motor freshened by Tracy Hooper.
Upgraded Parts include Edelbrock 204-214 cam, ported heads with O/S Manley SD valves.
Miscellaneous under hood parts powder coated or polished.
16X8 Enkei GNX style rims
Goodyear Eagle HR 225-65X16 front & 235-60X16 rear.
Rims polished by www.ohppolishing.com
Performance Update, 9-8-2008
1st Pass: 11.81 @ 113 - 1.69 60 ft
4th Pass: 11.80 @ 114 - 1.66 60 ft
11.72 @ 115.48
Altitude corrected 11.53 @ 116.91
Stock Turbo - Home ported heads
EB 204-214 cam - V4 Intercooler - THDP
NEW WHEELS !!!!
Budnik Wheels / Modern Reproduction GN Wheel.
This was the first set in 18".
Fronts are 18x9 with 4.5 bs. Tire size 245-40
Rear Size is 18x10 with 4.75 bs. Tire size 285-40
You can order them polished or do what Sean did and get the centers and holes powder coated.
The car will be lowered in the near future which should really set these wheels
Thanks for visiting!