Well I've gone 130+/- in my GP STE. It was at 5900rpm in 3rd gear (3.33:1 final drive, 1:1 3rd gear ratio, 225/60/16 tires if anyone wants to figure out how fast I was really going). I decided it was time to let off because my redline is 5500 and I didn't feel like letting it shift into OD just to completely ruin the 4th gear clutch. I know of someone who supposedly went 155mph in a car just like mine...he said it was well into 4th gear. The car felt very stable...but my dome lights mysteriously came on...I was confused.
Been in the SSEi to 115mph +/-, and I've ridden in the GTP at 125 NUMEROUS times...went 120 in it today...only took like 14 seconds to get there.
I would say around 160mph would be the limit in a stock geared SSEi. If you lengthen 3rd gear or shorten 4th I would imagine, assuming you have the mods to make enough power, that someone could do 170...but not with stock power levels.
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!