cruising rpm's? [Archive] - GrandAmGT.com Forum

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logicalgt1
02-16-2004, 09:10 AM
I just bought a 2002 GAGT and I feel like it's not going into overdrive. I had a 99 GAGT and I swear it ran at lower rpm's when crusing at about 60-65. I think the 99 was faster too. The new one is running about 2000-2100 rpm's at 60-65. Is this what you guys are running at those speeds?

juanvan
02-16-2004, 09:31 AM
@ 60 ~ 2000
@ 70 ~ 2500
@ 85 ~ 3500
@ 90 ~ 3800

guyl
02-16-2004, 09:41 AM
I have a 99 GASE V6

and I swear I get

62.5 mph 1700
73.5 mph 2000

and so forth........

logicalgt1
02-16-2004, 09:42 AM
Thanks! I was banging my head all weekend trying to figure some stuff out with my new car. I guess the rpm's are normal. One thing kinda funny was that I was sure the car had gotten a lot slower this past week so I cleaned the throttle body and checked the air filter etc... Then I'm driving down the road and I started thinking maybe my throttle isn't opening all the way. Well it wasn't opening all the way and what the problem was.... My car mat. I put this car mat in my car for winter slush and it was blocking my accerlator from hitting the floor. I took out the car mat and I was like hang on! So the moral of this story is check your car mat's to see if their blocking your accelerator.

Gt00
02-16-2004, 10:06 AM
Sometimes the linkage can be out of adjustment as well . You can check with the engine off by having someone floor it , and checking to see if the TB is opening fully . You may have to adjust it to open all the way . I've seen some 5.0 mustangs that were not opening fully from the factory .

logicalgt1
02-16-2004, 10:07 AM
I posted before I saw your response guyl. That's what my 99 cruised at too. Now I'm wondering though if it's a difference in the years or it's the gearing ratio's or something. One thing I noticed is that you have a SE and I think the gear ratio's are different though. I reset my PCM to see if would change the shifting points but I didn't see any difference.

guyl
02-16-2004, 10:11 AM
Yes the gear Ratio is a little different, but I think its only the final gear ratio that is different.

Guyl

logicalgt1
02-16-2004, 10:16 AM
GT00, I will check the linkage that's a good point. Do you know if the linkage also controls the trans to go into overdrive or is it done by the computer?

GCarr99GT
02-16-2004, 10:40 AM
65mph - 1900RPM with 99GT

Kruzininla
02-16-2004, 01:26 PM
'00 GAGT. 68mph @ 2000 rpm according to my tach and speedometer.

safemode
02-16-2004, 01:36 PM
rpm to speed depends on air temp, fuel. etc. basically it depends on the hp output of your particular engine at the wheel. Lower tire pressure will require more power from the car to go the same speed as a car with proper pressure. For that matter, tread to road surface also plays a small part. The rest is the general state of the engine and drivetrain. So everyone is going to get slightly different rpm values for certain speeds. Not sure what the point of everyone chiming in with their speed and rpm value is going to be for the thread originator.

Basically suffice it to say that at 60-65 you should be getting really close if not at 2000rpm when in overdrive. There is a very simple test to figure this out once and for all. Just drive the car in 3rd gear instead of Drive, see what the rpm is at when you're at that speed. Compare to when in drive at cruise control on. Overdrive should kick in a few seconds after cruise control takes effect. Thread done.

logicalgt1
02-16-2004, 02:20 PM
Safemode, that's the kinda answer I was looking for. Will do tonight!

Blackrider
02-17-2004, 08:34 AM
Set the Cruse on a flat road with no wind wait a few seconds ad it will tell you your crusing RPM, Mine is just a hair under 2000 when doing 60.

GTspeed
02-17-2004, 09:32 AM
99 GT

at 70 its at about 2100 to 2200 rpm

rocketfast123
02-17-2004, 10:32 AM
for FYI my 2.4 is at 2500 at 80

Blackrider
02-17-2004, 11:04 AM
Also remeber that overall drivewheel size is a factor to.

IAmCanadian
02-20-2004, 06:10 AM
97 GASE 15in tires
@50 - 1400rpm.
@60 - 1500rpm.

RAPTOR
02-20-2004, 07:37 PM
My 99 GT at 100mph is three grand

grandam-wpg
02-21-2004, 12:30 AM
2300RPM at 120KPH which is around 80MPH

EDIT: Actually it was at 2300rpm at 80MPH which was around 120 KPH or so.