About My Grand Prix:
This is my 1999 Grand Prix GT. This car is pretty basic for a GT, it has tan leather, and a CD player with 7 band equilizer, and it has digital dual zone climate control. Other than that this car is pretty basic and doesn't have many options. It has the lightest stock wheels for Grand Prixs, 16" torque stars. I purchased this car in February of 2006. It was listed on the Grand Prix forums for sale, and the guy just needed to pay off what he owed on it. He was asking $2450 for it, and then actually dropped his price down to $2000. This car had 202k miles on it and has some minor body damage, but I was just looking for a reliable car that I could work on easily and didn't car much about appearance, so I thought it was a good deal. The transmission had been rebuilt at 178k miles so I knew that was strong. It already had some minor mods, it had a K&N air filter, and no catalytic convertor/u-bend/or resonator in the exhaust. It also had some dual exhaust tips as well, they just weren't installed. Plus it has tinted taillights that were done wrong but with a little work I think I can make them look good. I figured I could use the car as a budget "go fast" project and as a daily driver because I didn't really have anything that fit as a daily driver.
Keep in mind this has the naturally aspirated 3.8L engine, not the Supercharged one that the GTP's have.
Performance Specs:
The best 1/4 mile time I have achieved in this car is a 14.639 @ 92.78. I was expecting the car to run a 14.8 at best, and was only shooting to break into the 14's, and only because I already knew it runs abnormally good for the mods. But Norwalk was pretty sticky so it suprisingly pulled off a 14.6. For the mods that is a very good time. At that time all it had was the mods it had when I bought it, plus the alternator pulley and thermostat. I also ran it with the seats removed, but that is only ~70lbs. so it doesn't make a HUGE difference. With less than $200 in mods its running equal to stock GTP's!
UPDATE!
Since I installed my Cam and supercharger I have taken the car to the dragstrip again. I was running ET streets on the front with 20psi, on pump gas, with only track prep being removed headlight, spare/jack, and removed rear & passenger seat. I still have yet to do any tuning to the car as well. I pulled off a best of a 13.2241 @ 102.07 w/1.9012 60'. This was done with a 3.4" Supercharger pulley and 20.5 degrees of timing. With just a harder launch it would be capable of 12's, and with some tuning and race gas I am confident I could get it down to 12.7-12.8's easily.
NEW UPDATE! 12/20/06
Since my last trip to the strip I installed my ZZP Stage 2 Intercooler and the Pacesetters Headers and dropped down to a 2.9" Supercharger pulley from the 3.4" I was running before. Once again, with no tuning done yet, I took the car to the strip again. This time was on my regular street tires, full interior, and pump gas. I removed my headlight and spare/jack. I lowered the front tires to 22psi. With this setup the car pulled off a best of 12.665 @ 110.44 w/2.01 60', this was on a 2.9" pulley w/20.5 degrees of timing. I know that with some bigger injectors, a tune, and race gas, I could drop to a 2.6"-2.7" pulley with 22-23 degrees of timing and make much more power. That combined with some slicks and a decent launch and there is no reason IMO why this car shouldn't dip into the 11's.
3/2/07
I have been getting the car ready for the '07 race season lately. I plan on taking it to MGM (Michigan Grudge Match), which is put on by MIGPC and held at Mid Michigan Motorplex, and I also plan on making some runs at IDD (Intense Drag Day) as well at Norwalk (summit motorsports park). New for this season since my 12.66 pass is a 2.8 pulley on pump gas, 23 degrees timing, 1.7 intake rockers, .052 head gaskets & .010 mill (9.75:1 compression instead of 9.4:1), ported heads, and ported throttle body. The car will also be getting a bit more weight reduction then it usually does, and I plan on running M/T ET Street Slicks (not the et street radials) as well and some race gas if I can find some. Should make for an interesting season with hopefully some good results!
5/10/07
I ran the car at MGM on 4/21 with my new setup. I had a few problems. I had to replace some wheel studs the day before and took off my rear brake rotor and didn't put my ebrake on properly so I was unable to do burnouts at the track when I got there. Because of this I was not able to get the traction I was hoping for. I also found out after my first pass that at some point before this my mini-afc quit working so the car had basically no tune on it at all and was running extremely rich. I also didn't pay a whole lot of attention to my scans and didn't realize that with my air intake temps as high as they were I was not running as much timing as I would've liked. I was hoping for 23-25 degrees of timing and it was only at ~20 degrees max all day. I ended up tuning it out a little bit and dropping to a 2.6 pulley on the M/T ET streets. I was able to squeeze a 12.442 @ 111.45 w/1.85 60' out of it by the end of the day. I also realized later when looking at my logs that I wasn't even going full throttle until ~35mph, with just some harder driving it should be capable of much better! While its not as quick as I was hoping for its pretty respectable IMO. I am going to try to tune the car in a bit better and fix some of the issues I was having with it and take it to a test and tune at Norwalk. My goal is 11's at 115mph by the end of the year.
Update 6/10/07
I dynoed the car at my school. The car was untuned, on pump gas, with a 2.7 pulley and low timing. On a dynojet it pulled 319.9whp/363.7wtq. For a baseline number that is not too bad IMO, when the car was N/A with the same setup it ran 14.63 on it made 178whp/227wtq so its a bit of improvement. I plan on dynoing the car again with a good tune and I'm hoping for somewhere up around 350whp/400wtq. With a 2.55 pulley and a good amount of timing with race gas the car should easily make that kind of power. Hopefully we will find out soon.
Update 8/12/08
I dynoed the car once again, this time on a Mustang Dyno. With a slightly different setup than last year (XPZ cam instead of XP w/1.7 rockers, and electric wp), and a good tune, the car managed 347.1whp/417wtq. This was still done on pump gas, and still with a 2.7" pulley. Air fuel ratio averaged 12.1 for the pull, so the tune is pretty much dialed in.
