zedder 1 9 9 0

I was watching American Muscle Car on the weekend and this episode was on the Buick Grand National/Regal T Type. According to this show they came out with the GNX in the final year of production (1987), it came with 275 hp. Since both these cars share a similar turbo charged 3.8, I was wondering which one is faster, the TTA or the GNX.I'm not sure what the HP rating is on the turbo trans am, But i know its damn fast.

Jason E

Well, Motor Trend rated the GNX at 300hp in the road test I have, and the TTA is known to be underrated at its factory 250hp rating.

MT ran a 14 second flat 1/4 with the GNX, and likewise with the TTA. I'd say its about a dead heat. The TTA will do 162MPH though, whereas the GNX won't come close because of aerodynamics.

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Jason E
'89 Camaro RS 2.8
Hypertech chip/K&N filters/Accel 8.8 wires,coil/RapidFires
Eclipse CD and 100x4 amp/Boston plates and 6x9s
Alpine Alarm w/ Keyless entry
IROC tailights/tinted windows

avro206

Motor Trend Sucks...but I still buy it

Car And Driver tested a TTA- 0-60=4.6
1/4= 13.4 @101mph
It also had a TH200R4 as opposed to the 700R4. When they tested a GNX 0-60=4.9
can't remenber 1/4 mile but it was hi 13s.
TTA is faster.

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88 IROC the best RS ever made!
well except for the B4C

Jason E

871LE,

Motor Trend sucks NOW...definitely. Trust me, they used to be far better. I don't doubt though that C&D got better performance numbers than MT...they always have. Why, I have no clue. And Road and Track is always way slower than both! Go figure....

I had a feeling the TTA might be faster, but I didn't wanna say that and be proved wrong. Thanks for the C&D numbers!!

92GTA

iTrader: (11)

As far as stock, I'd say they are about the same in terms or 1/4 mile times, slightly modified though, the TTA will kick it's *** all day long at the track. You can't really compare the two at higher speeds of course because the TTA is way more areodynamic

I'd rather own a TTA

Monkie

Yea motor trend does suck now. I think the best one is Chevy High Performance

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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust
8.5mm MSD Ignition wires
TB Coolant bypass

turbo497

I would go with the TTA. I've owned two grand-nationals and altough they are not gnx's they are basicly the same cars. GNX had an added rear end brace slighty larger intercooler, a ceramic finned turbo and a more efficant exaust. My GN's best time at track was 12.9 1/4 mods were pit bull chip air filter and dump tube. My transam is faster than my gn's. Still I plan to acquire a GNX someday. one thing great about these cars is they seat 5. I sold one grand national for wifes engagement ring and one went to my brothers garage... it has been stored since new 4700 miles on it. My turbo transam is a daily driver.

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3.8 turbo 20th anniversary transam #497 first owed by Clifford Williams, Bass player from rock band AC/DC

oldbird

oldbird

Hay Steve, sorry about the last one, still learnen the ropes. Anyone know the TTA #s for
Canada?

Bill,87blacksafire,bird. [This message has been edited by oldbird (edited November 24, 2000).]

[This message has been edited by oldbird (edited November 24, 2000).]

Grim Reaper

There were no TTA's "OFFICIALLY" imported into Canada by GM as far as I know. All TTAs were sold in the US only.

Of course you could buy one and swap the speedo to make it legal for import. Since it is pre-1991, you don't have to convert it to Daytime Running Lights to bring it into Canada.

Would definitely be one of a kind.

[This message has been edited by Glenn91L98GTA (edited November 25, 2000).]

20-psi

I own #609 TTA. The first weekend out racing, it went 13.55 around 101, After some mods (chip and K&N filter) and some other free mods, turned the boost up, it would always run in the 12.80 range with a best of 12.42 @111.

Most of the GNX's i've seen run around 13.70 with mods 12.70,

I know of one for sale in Northern Virginia with less than 500 miles asking $35K.

Mike 25th

I think the GNX and the TTA have to be very close, but remember, the GNX was the fastest accellerating/production car in '87. The TTA is only 2 years newer, I can't imagine much changed in the motor, especially considering GM is famous for using left over parts to build new cars.

Now the GNX was a leap ahead of the GN. So please don't compare. What is the weight of a TTA compared to a GNX? That should be the tell tale sign of which car is faster.

My $.02

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92 Z28 - 5.7 - Black/Grey Leather
Macewen White Faced Guages
SLP T-RAM, 24lb/h Injectors
Accell 52mm Throttle Body
SLP 1 3/4" Headers and Cat Back Sys.

My T-Rammed L98

88 350 tpi formula

iTrader: (9)

I have seen both or should I say all three at the track the tta was the quickest one but, only by 3 tenths then again it all depends on how they were treated being these are not factory fresh cars.

turbo497

the GNX and turbo Grandnationals Weigh in at 3100lbs without t-tops they are lighter than TTA's

merf23

Mike 25th, i remember reading about both cars when they came out (unfortunatly never did my own raod test), but the TTA had different heads than the GN...i dont recall any other differences but its been a while.