About 20 mins ago I just killed a Pontiac G8 GXP (verified as after race I was driving behind him and read the "GXP" on the trunk). I started in 3rd gear, w/ traction control off and sport mode on. Not sure the mods he had but it was lowered and on big, stanced, black wheels.

My car's performance mods (for those that dont know) include Magnaflow high flow cats, Magnaflow resonated "Tru X" x-pipes, K&N panel filted, qwikertz intake elbow, and of course the Mina Gallery 1.5# pulley.

I looked up the stats on the Pontiac G8 GXP. As I'm sure you all know, its actually a Holden, not a Pontiac (just like the 2004-2006 GTOs). It has (stock) a 6.2 liter LS3 Corvette engine, and makes 415hp. It does 0-60 in 4.6 seconds, and the 1/4 miles in 12.7 seconds. And I killed it lol. I had my windows down and I could hear it chirping tires on shifts so it was a manual as well. I could also hear my blower whining a sweet song of victory.

 

AHHH! Way to go underpressure! Not to sound like "Bragger know it all", but when the STR is pullied and the intake and exhaust are uncorked...Watch out Boy! That 415 chp @ 415 lb/ft trq. Pontiac G8 GXP got dusted by an est. 440+ chp @ 460+ lb/ft trq. 2003 STR. You all likely viewed the video on this forum showing the STR dusting the Chrysler 300 C Hemi (345 chp) and Holden V8 (Pontiac G8, 6L 365 chp)? In this case, the STR's 4.2L + 2 litre positive displacement blower equals the displacement of the 6.2 litre GXP. However, the STR's induction is forced fed, in the case of underpressure: stock 13 lb. boost + 1.7 lb. boost = 14.7 lb. boost. The mods considerably bring most of the power further down the rpm scale, flattens the torque curve well into the midrange, and the ECU learns and adapts to the new parameters as well. We're beginning to understand that as mods are introduced, the redlne climbs as well as later shifts are realized. Underpressure, get the Mina intake and Dynomax VT mufflers for 20 rwhp. Proud of you brother.

 

Fantastic and WTG!

Thanks for sharing the story.

 

Awesome! I really think the STR is more of a highway car than a 1/4 mile from my own drivings.

 

Thanks! This is actually my second G8 kill. The first was debadged but I'm guessing was the GXP as well (their most powerful version). That first one was lowered on staggered wheels, had an exhaust system at least, matte white paint, and I could see sway bars underneath it - the owner dropped some money on it so I'm guessing it had performance mods other than just exhaust. It put up a better fight than today GXP but still lost to the STR.

So far my kills are an SRT8 Challanger, two G8s (one confirmed a GXP), an STI, and a modded 135i that belongs to a friend (intake/exhaust/ecu). I'm really digging STR ownership

Funny thing is is that the car that made me work hardest for a kill was an obviously heavily modified early 2000s VW Jetta lol. But he caught me off gaurd with the race, and I was not in sport mode and had my TSC on. I killed him too lol. But he must have had extensive mods bc I've beat more powerful cars by larger margins...

 

That's a good kill, GXP's are pretty fast. What did you guys get up to? Would love to run my SRT8 against a STR with the same mods just to archive it. I haven't found a R yet so I still favor the SRT8 in a race, but would love to see an R in a video racing something because youtube is flooded with race vids of everything else, but STR's. Rare cars indeed and it being more of a Gentlemens car could be the reason for lack of as well.

 

I never got a chance to look at my speedometer as I was focusing on the road but it was about an 1/8 of a mile race, and I owned it the whole time.

 

Cool

 

Mike, ditto to the STR more of a highway car. This'll change with an LSD and/or gears. JC-TypeR, though not a big kill...on Youtube you can see an STR take out a 310 chp 2007 Mustang GT, LOL!

 

Though not purpose built 1/4 racers, the STR does do well in blistering acceleration. When I raced my friend's modded 135i, I had to reel him in as I spun my tires throughout the entire intersection (was on empty road so please don't shoot me lol) and he got the lead. But I learned to start not on 2nd on the J gate, but at 3rd. Yesterday's G8 GXP kill was without tire spinning. Oh I also pushed down the gas peddle in a quick manner as opposed to just "stepping on it."

 

STR might not be an ideal 0-60 car, but it's geared great for top end/highway pulls, so its 60-120 is actually pretty quick, good aero too helps a lot at those speeds,

Trap speed says it all (hp), the GXP's trap 109-110mph stock, and about 114-115mph with bolt-ons,

So your STR is no slouch that is for sure! Not bad for a luxury tank eh...

 

Yep, a quick smooth depression of the gas pedal is mucho better than just slamming it to the floor. A Quaif LSD would solve some of the launch from a dig equation. Moving most of the torque to the bottom end gives the tall 2.87 gears more bite.

 

Are STR's top speed limited? And will a tune delete the limiter and whats the top speed when done? I'm a top end guy and have had my car 175 mph plus a couple of times and 150-160 mph so many times i can't remember, but there's no governor and my tune has the top speed set from the stock 180 mph to 190 mph in which i haven't pushed that limit to see if it actually will do it, but I have ZERO doubts that it will.

 

Great kill not trying to rain on your parade but the GXP did not have a manual option only automatic transmission.

 

STR is speed limited to 155 mph. If not limited it can go 175 mph. A tune can remove the speed limiter.

 

Not saying I know for sure, but I thought I read that both an automatic and manual were available?

 

GXP most certainly had a 6 speed manual option,

STR is electronically limited to 155mph, I've heard the 175mph figure quoted as possble without the limited as well,

I don't think I've seen a single confirmed 'tune' for the STR anywhere/posted on these boards, so not sure about removing the limiter through a tune is possible either,

I think discussion regarding 'top speeds' is a moot point; it's completely impractical with these (relatively) low powered cars to even attempt to hit speeds excess of 170mph
Acceleration beyond 120mph is already reduced to a crawl imo, you need a ridiculous amount of straight road free of traffic and cops to try and top out most production cars,

Maybe I'm biased, my other car is <600rwhp, I've owned <700rwhp car geared for top end, and been in some seriously fast cars for 60-130mph blasts, such as <800rwhp ford GT, turbo vettes, etc, those get up to speed fast in a somewhat reasonable length of road,

To me, most relevant representation of a vehicles power/acceleration is 1/4 mile trap speed (mph) and it's 60-130mph time, that pretty much says it all.

 

Sounds like you had some fun this weekend. Me too!!

I went to Maryland Intl Raceway this Sunday and made some 1/4 mile runs on a very well prepped track. I can't locate my slips at the moment but here are how my runs went:

1) 13.0x @ 107 (Temp 54 F)
2) 12.9x @ 108
3) 13.0x @ 107
4) 12.9x @ 108
5) 13.0x @ 107
6) 13.1x @ 106 (Temp 62 F)

Edited: actual time slip data:
1) 13.048 @ 108.10
2) 12.962 @ 108.77
3) 13.034 @ 107.17
4) 12.946 @ 108.66
5) 13.109 @ 106.12
6) 13.157 @ 105.47

I drove on the scale and my car was 4140 lbs with me (225 lbs) in the vehicle. I was very low on gas and everything from inside the car and the trunk was removed.

As a reference, that morning a Silver 2013 Camaro SS was running 13.1x to 13.3x @ 110 to 114 mph.

 

Nice runs 1320racer. You're running the stock catalytic converters? Have you considered the addition of the Caldoofy intake tube and Mina intake?

 

Around here, stock SRT8s (Magnum, Cherokee, Challenger, 300) are all around a second slower than my STR at the 1/4 mile strip. They need quite a few mods to even get close. Hopefully once the season starts back up in a month and a half I will get a chance to line up against a few and get some more videos up!

Under Pressure, that should be a great run if they know how to drive. There's a local one for sale here that I've seen run at the track. He has full exhaust and was dyno tuned and put down 40 more WHP than I did on the same dyno (but 3 less ft lbs. of torque ) yet only managed to out trap my speed by 1 mph while running the same ET with drag slicks. I'm hoping to line up against one of these as well this upcoming season.