Weissach

Been searching, can't find much really detailed information on the 928GT. I know that there were less than 100 imported into the US in 1990, but how many are left?? What differences are there compared to the standard model? The engine specs are well documented, but how about brakes, transmission ratios, spring rates, cooling? How does it compare to a similar GTS?

Would like to get more specifics. They do cost more than standard S4, but cheap next to a GTS. From my search, it does look to be the ultimate 928---if you don't count the GTS. Any more information would be greatly appreciated.

GT6ixer

I asked a similar question a while back.

https://rennlist.com/forums/928-foru...-gt-vs-s4.html

Rob Edwards

Good timing, just came across a copy of Christophorus from July of '89, where they have an article on the then-new '89GT. And an article on the upcoming RDK TPMS, after that. Link to a PDF:

https://webfiles.uci.edu/redwards/pu...%204-18-17.pdf

Weissach

THANK YOU!!

docmirror

The GT has a selected crankcase, and heads. The cams are different, and the fuel and ign maps are different producing a few more HP. Revs to 6600 rather than 6200, idles a bit higher too. Brakes are same, shocks are the sport shocks, which were avail as option on S4s, a bit stiffer. Trans is 5 sp of course, and rear end ratio is 2.73 compared to the 2.20 or 2.54 of the S4, depending on year. GTs could be ordered with pretty much all the options of an S4, I think they are usually well optioned and a lot of them were pre-order cars to be filled, rather than spec delivery like the S4, but I don't know that. Cooling is the same as S4 with 5sp where there is no auto trans cooler, but the GT has a low mounted engine oil cooler. 90 and later have the air flaps to block off rad cooling air. From 90-91 got the digi-dash, airbags, and a few other gewgaws over the 89GT.

The engine doesn't have the oil consumption issue of the GTS, but it also doesn't have the fat a$$ fenders. Most GTS are autos, all GTs are 5sp. Have the same top speed, but I think the GTS has a slightly faster 0-60 time by a few tenths.

Who knows how many are left. They don't come up for sale often, and when they do, they sell pretty fast.

Chris Lockhart

And for some reason the '89 GT's seem to put down more RWHP (in basic factory form) than any other year/model of 928, GTS's included. Porsche was very conservative when they rated them at 326 CHP. :-)

jcorenman

Cams.

According to the 928OC data, there were 100 in the states in '89, 129 in '90 and 138 in '91. Not big numbers.
I'm also biased, but I think it is the ultimate 928 including the GTS, and undervalued.

Imo000

If you want a rare GT, get a Canadian spec one.

Chris Lockhart

Thanks Jim! I thought that all 3 years had the same cams, so that's good to know.

AO

All I can say is I love my '91GT. Awesome car! If you have the means, I highly suggest you get one.

928cs

They do have the same cams, which are the same as the CS (with different references, but they can be mixed).

The 1989 GT is still the best (regular) 928, at least for me.
In fact, my favorite is still the CS, but the 1989 GT is a better car for a regular use, with a regular equipment.

And it was produced only during around 6 months.

jcorenman

They did. I didn't mean that 89 GT cams were different than 90-91, but rather that GTs in general were stronger than the factory numbers-- mostly because of the different cams. Sorry for the confusion!

Chris Lockhart

Ahh ok. Yeah the GT's were all very strong, but I remember years ago someone had put together a spreadsheet with all various member's published chassis dyno results and what if any mods had been performed prior to said run, and the '89 GT seemed to reign in the stock RWHP war even over the '90 and '91 models. Not sure if that still bares true but back around 2005 it was . :-)

Imo000

My 100% stock (even had the spare tire in the car) '85 5-speed ran a 13.7 sec. in the 1.4 mile. That's faster than any stock 928 I've herd of by a lot. Logically that would make it stronger then others too.

AO

Yeah, but that's a Canadian 1/4 mile.