Re: Grand prix GTP 1999 */Ced running off 87 octane mods
Originally Posted by 19bonnie95
My friend has been running his 99 gtp off 87 octane to save money. He always ran 93 octane but he says its safe to run 87 octane if he babys it. He has custom donpipe u bend delete 3.4 inch pully intense pcm drilled 180 t-stat K+N cold air intake. Is he right is it safe to drive on 87 octane if he babys it he says max 2 lines of boost on his gauge when getting onto the freeway......
FWIW, if he TRULY doesn't ever go into boost more than like 1 or 2 bars on the stock boost "gauge" then he should probably be fine. (2 bars on that thing is only a little over 1psi) Not sure why he would do that with mods, but if thats what he is honestly doing, I don't think he would see KR with that little amount of throttle. I've never looked at an Intense PCM timing table that closely so I'm not sure what it does for part throttle timing, but that would be the main factor really.
However, even with 93 octane that car would probably get KR. Its barely modded enough for the 3.4 pulley as it is. If I were him, I would definately be running 93 octane. If he really adds it up, and actually figures his gas mileage, he probably isn't saving that much money if any. You typically will get worse mileage with lower octane fuel so it doesn't really save you any money to run it.
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!