406TA

Any of you IROC owners (5.7) ever line up with a stock (or near stock) GN?? I'm guessing that stock vs. stock the GN would beat the IROC but anything can happen on the street. I think the '86-87 GN's were very low 14's stock and obviously in the 13's without spending much.

I'd love to rewind to the 80's ('87 or so) and line up these cars (1/4 mile):

IROC 5.7
Grand National
Mustang LX 5.0 (5 speed, notchback)
Corvette
Pontiac GTA (5.7)

It would be a blast to watch!!

prOject-IrOc

i raced one when i with just a muffler and he was at my rear quarter panel the whole way. but when i took off, i went over some train tracks and the tires spun. about 10-15 seconds later my tire was flat and i let off early....we were probably doin about 65-70 mph.

Synapsis

I ran one with an upgraded downpipe or some such when I had slicks/lift bars/rear suspension of happiness set up from a dead dig. I pulled a car and a half off the line, then he blew past me when I was at 100 mph. That's ok, that's outside the 1/4 mile with my car.

Synapsis

I also ran the Mustang LX 5.0 once. From a dead dig it was perfectly even all the way to 120 mph. Neither of us gained/lost an inch. He had gears and I had suspension.

ThraxXx

We have a lady here in town with a GNX. Damn thing is stupid quick. Her husband is a car freak and drives a 1967 dart. I saw the GNX the other night. Aparently they have it running a sequential turbo at 17psi boost. They ran the car last year at the king of the hill racing and were dominating over the V8's. I so want one of these turbo V6's for my TransAm.

MNformula350

iTrader: (2)

Years ago my brother had a 87 GTA 350 TPI, he raced a 87 GN and beat him from stoplight to stoplight.
now he owns a 00 LS1 T/A just Dynoed last weekend at 450 RWHP.

prOject-IrOc

couple of vids you guys will like...

Worlds Fastest Single Turbo GN

And a TT GN Smokin the tires on the dyno!!


Oh myyyy..

TTA 1387

Stock for stock, the GN's were quicker. At least 86-87. The hardest part for a GN was launching on the 215/65/15 Eagle GT's. After spending less than $500 though, you'd be in the 12's

It only took $100 to get in the 12's with the TTA.

Its amazing how those cars respond to just a couple of mods.

Camaro68Vette63

84-85 non intercooled hot air setup GN's ran high 15's nothing a L98 shouldn't have a problem with. Than 86-87 got the intercoolers and thats a different story. Those run high 13's bone stock I think a 13.8. They will poop on a stock 350 in the 1/4. GNX could touch a 13.5. All GN's run close to 16PSI stock! I owned a slow 85 T-type and ran a 15.7 running ok. I like my Z-28 better though. Hey it was the U.S. fastest production vehicle in 87. outperforming corvettes too. But GM couldn't let a buick dominate for long

fly89gta

iTrader: (1)

What in the hell is that?

phoenix305

holy crap how do you smoke the tires on a dyno. i wonder if the dyno would have read more power if it didnt spin???

tilstad

Yeah, that GN was wild! Seemed like it almost couldn't spin those big turbos up at first though, Isn't that what sequentiel turbos are for? First get the pressure from the small one to be able to spin up the big one who really deliver the goods....?

Wonder what happens to the small turbo after it has done its job, is there some kind of relief valve or something to not make it spin to fast and burn a bearing?

For all of you wanting turbos in a thirdgen, here's a twinturbo setup for f-body's: www.bbsdesign.net

iroc22

Maybe he means the Sequential Fuel Injection?

Synapsis

Or he could mean sequential turbo like on my RX-7 engine.

fly89gta

iTrader: (1)

GN's are single turbo....


Iroc22, yeah I assume that's what he meant..I was just being an *******

Synapsis

Stock. My VW also doesn't come with an RX-7 engine. :P

I was just saying seq turbo is a real concept.

ChrisFormula355

So when are you going to race casey again because last I heard he thinks he's faster than ALL the local thirdgens except mine, hahah.

Synapsis

He don't want none. I'll even keep the bottle closed.

PETE

iTrader: (1)

I have a sequential turbo!!!!!!!

Right now it's been outta sequence for almost a year

fly89gta

iTrader: (1)

lol@Pete

25thmustang

The second car doesnt have a 3.8 in it anymore, its a V8, but thats all I know!

iroc22

haha noo not fly89gta....

fly89gta

iTrader: (1)

heeeeey now, that's abuse of power, don't make me edit your response, oh wait..wrong site, no power here..

Well, um...well....er...the Canucks blow! Go Flyers (another boring summer, they should've beat Tampa )

tpivette89

both the 87' vette and 87' GN could run the exact same 1/4 mile time and mph if properly driven. there are plenty of people running high 13s in 100% bone stock TPI Corvettes

fly89gta

iTrader: (1)

True.


Once you start modding the Vette doesn't have a chance

tpivette89

very true! a N/A car doesnt stand a chance vs a boosted car when the mods begin.

i just feel the need to correct people cause there is so much misinfgormation going around about the Corvette. for example:

A- the GN was the fastest GM production car in for 86/87 (GNX doesnt count)
B- the Corvette HAS to have the highest hp rating out of all the GM cars

both of these statements are false. i already touched upon "A" with the Vettes being able to match the GNs 1/4 mile times. and as for "B"... for 86, the GN was rated at 235hp, while the non-vert Vettes only had 230. in 87, the Vette got an extra 10hp, but so did the GN. and finally in 89, the TTA was rated at 250hp, while the Corvette had 5 less at 245

tilstad

What's the difference between a GN and a "GNX"? Is it a special model?

fly89gta

iTrader: (1)

GNX is a special edition.

had some performance upgrades. It's not THAT much faster than a GN..

I would never want to own a GNX, too rare and well, IMO they're not worth the $$

406TA

I would never want to own a GNX, too rare and well, IMO they're not worth the $$>>>

Yeah, I'd hate to own one of the most sought after musclecars of the last 35 years!

fly89gta

iTrader: (1)

Big deal.

I wouldn't pay the $$ they're going for when they're marginally faster than a regular GN. I wouldn't mind driving the **** out of a GN, modding a GN, daily driving a GN...would you do the same to a GNX? Nope.

Also, the only thing really special about the GNX is it's rarity. Yes it some performance upgrades but it's not that big of a difference compared to say a GTA and TTA comparision.

iroc22

yeah the Canucks fell flat on their face in the playoffs, at least they won the northwest division title. The Flyers should have beat Tampa easy with their physical play and skill but Tampa was too fast and Esche kinda sucked...I just hope Tampa beats Calgary, I hate Calgary...

back on topic....

GNX's definitely arent worth the money. If you're going to use it as an investment sure it's worth the money but I buy cars to drive them and a GN or T-Type is a way better deal.

tpivette89 I have been trying to dispell the myths that GM cant have cars rated higher than vette numbers for just about forever. where do people come up with these ideas?

fly89gta

iTrader: (1)

Esche had one bad game. Other than he stood on his freakin head. You can't blame that series on Esche one single bit. Plus it turns out he was playing with a torn muscle in his hip, he had surgury today

Anyway, back on topic I agree, buy a GN or Tttype and have fun. Even if I had the $$$ I wouldn't buy a GNX..like I said they're nothing special in my book.

Camaro68Vette63

I'm not talking about Gn being the fastest production car in 87 GNX was. Even if it was only .3 faster in the 1/4 it was the fastest production car in the U.S. Definitley not worth the money b/c only 500 or something were made but i do know it did beat the vette. A 1987 GNX would beat a 1987 Corvette from the factory in the 1/4 mile. Sad but true.

Camaro68Vette63

GNX has different wheels, side vents on fenders, better suspension, brakes and drivetrain, somewhat similar to the 1LE of camaros.

fly89gta

iTrader: (1)

Drivetrain was almost the same. Only difference for the engine that was major was a ceramic coated impellar in the turbo, a better intercooler and a repgrammed chip.

406TA

I think the GN was also faster than the Vette in 1986-87.

tilstad

But when you ask any non car person about what they think of a coupe with the style of the grand national, most people go: oh no, not that car, don't buy that!

It's like with my thirdgen, people go, "no, it's not a smart car!"
"What's a smart car then", I ask. "Well, a Toyota or some Maibatsu or somethin, with preferably the smallest engine." And then I ask "why?" And they go "It uses little gas, looks cheap, so it must be, and uh.... well I don't know much about cars."

"your car uses way to much gas" they go. I ask "how do you know?" and they go "well it must, it has so large engine and much horsepower" And I go " well I want much horsepower, and you don't need to floor it ALL the time" And they go" Well, if you got much horsepower, you're gonna use it!" And I go " well, I WANT to use it! With a car like a thirdgen, you have the OPTION of power when you want" "oh no, you better get a Maibatsu with a 1.0" And then I go, "but that's like a straightjacket, isn't it? forcing yourself to not get what you want?"

So to sum it up; "smart cars look like crap, because if it looks cool, it has to have a too big engine and gas consumption, and then it's not a smart car. And it should look cheap plus be a car that you just throw away when used up. And lastly, it should have a name you have a hard time spelling., then you know for sure, you're SMART like the rest of us!"

tilstad

A nice SMART car like this:

fly89gta

iTrader: (1)

What in the hell are you talking about??

SOLID LIFTER

What in the hell are you talking about??

:werd:

tamatt27

Didn't the GNX have a latteral bar that seemingly lifted up the rear end of the car to keep the tires planted??
I don't know exactly what it's called, but I remember there being something like that on the GNX that the regular GN's didn't have.

fly89gta

iTrader: (1)

I was talking drivetrain(engine and trans). There are quite a few suspension differences between the two cars.

iroc22

I think the bar was just a similar design to the F-Body torque arm.....

But you're right they did have the arm and regular GN's didnt.

tpivette89

maybe you missed what i posted above. both cars ran high 13s when driven properly. enthusiasts from both sides have confirmed this with stock examples of each car. so instead of "thinking" the GN is faster, now you "know" theyre equal
like i said before, the GNX doesnt count. a GNX was a Grand National that had non-GM parts added to it by an outsourced company (much like how the TTA was created). therefore it doesnt count. if you absolutely HAVE to include it, then the Callaway TT Vette can be added to this game also. and i think they were a bit faster than a GNX

Camaro68Vette63

Yeh but can you but a callaway TT vette from a dealer?

tpivette89

yes you could. it even had an option code you could check off (RPO B2K). back in 87, alls you had to do was check that option box at your local chevy dealer, and in a few months a TT Vette would be waiting there for you

fly89gta

iTrader: (1)

Yup

ddn69

GN's are sweet. They actually have more then 235 horse. But GM couldnt bare to have the GN rated at 275 or whatever they really were. Why.. GNs have always been a staple symbol of drag/muscle. I might actually buy a 87 national in a year or so. Im tired of buying f bodies and cutlasses.... GNs are rather expensive though. 5k-12k roughly...

As for the GNX talk. It would be nice to have one. But being a 40,000 car I wouldnt even bother to keep it in a garage anwhere near trees or a wood garage.

Nate

tilstad

Sorry guy's just needed to vent a little. ;-)

rjmcgee

Nothing like a Corvette owner defending his tupperware car.