Super Street Network

 |   |   |  Buick Grand National - Turbo Tuning - Project Black Jack
Subscribe to the Free
Newsletter

Buick Grand National - Turbo Tuning - Project Black Jack

Evan Griffey
Apr 1, 2004
Turp_0404_01z+buick_grand_national+black_jack+front Photo 1/1   |   Buick Grand National - Turbo Tuning - Project Black Jack

In last month's issue, we installed a California Performance Transmission-built 200-4R in Project Grand National. The genesis for this move was fixing a boost problem from a previous installment. When we upgraded to our Turbonetics Cheetah III, the turbo's adjustable integral wastegate wasn't properly set up, resulting in less-than-ideal boost control and less-than-expected peak boost. Lou Czarnota fixed the wastegate actuator and it was during numerous 14-psi tests that the tranny situation surfaced.

With boost gremlins under control and a fresh transmission, we sped off to the dyno to better gauge where the Buick stood. It was more eager to run, and under the gun the boost needle moved quickly to 1.0 bar, not the wavering 7-10-7 psi we saw in the past. The results are clear on the dyno chart.

Compared to our previous run, the 3.8-liter Turbo 6 produces a much healthier graph. The powerband is more consistent throughout the pull, and the air/fuel ratio starts at 12.0:1 at 4000 rpm and ends at 12.5:1 at the end of the pass at 5800 rpm. Peak power is up 18 whp and mid-range power experienced a whopping 65-plus jump. It's all good in the hood...or is that under the hood?

Sources

Turbonetics
Simi Valley, CA 93065
805-581-0333
http://www.turboneticsinc.com
California Performance Transmission
Huntington Beach, CA 92649
800-278-2277
www.cpttransmission.com
Lou's Auto Service
Lake Forest, CA 92630
By Evan Griffey
271 Articles

BROWSE CARS BY MARKET

MORE HOW TO

500 horsepower. It's a number that whoever made your car never thought it ought to have.
Aaron BonkJan 31, 2017
Audi B8 A4/S4 coilover kit and VW MK4/5 Golf/Jetta airbags are now available from Raceland
Bob HernandezJan 25, 2017
Engine and chassis bolt-on bits for the undeserved Scion iM
Sam DuJan 24, 2017
The 944S2 is capable of making solid power but to keep making it reliably it's important that maintenance is up to date.
Rory JurneckaJan 18, 2017
You not plowing into the back of that Chrysler starts with your brake pedal and ends with its pads, but that's not the whole story.
Aaron BonkJan 16, 2017
Sponsored Links

SEARCH ARTICLES BY MAKE/MODEL

Search
CLOSE X
BUYER'S GUIDE
SEE THE ALL NEW
NEWS, REVIEWS & SPECS
TO TOP