RPM really high at 55mph ? GSX 2G

GSX95AWD · Nov 27, 2012

Cruising down the highway in 5th gear, doing 55, the rpms are right at 3k. Every other car i drive the rpms are around 2400~ or so. What would cause this, or is this just average for DSM's ? :confused:

LxiMax · Nov 27, 2012

That doesn't sound right to me. I have an Auto, but in 3rd I sit at 2500rpm and O/D I'm at 2200rpm at 55mph.

gophishy10 · Nov 27, 2012

I'm about the same. I thought it was pretty high too. At 65 on the highway, I'm at about 3200k. Wish I had a 6th gear.

GSX95AWD · Nov 27, 2012

Right at 3000, i'm just building boost non stop, And its really killing me on gas just to drive down the highway at normal speeds. I'm darn clueless as to what kind of fix this would be.

95talongirl · Nov 27, 2012

That doesn't seem right to me for 5th gear. I know with mine, I'll sit at 3000-3500rpm in 5th.. but at 70-80mph.

Transmission seems ok? Any problems getting into gears? Sloppy shifter making you think you're in 5th, but maybe you are not?

Archer Fabrications · Nov 27, 2012

I get 60 mph at 2500 rpm on mine in 5th . i have a new shep stage 3 5th gear is stock though. an evo 3 5th gear will bring it down even lower.

GSX95AWD · Nov 27, 2012

95talongirl said:
That doesn't seem right to me for 5th gear. I know with mine, I'll sit at 3000-3500rpm in 5th.. but at 70-80mph.

Transmission seems ok? Any problems getting into gears? Sloppy shifter making you think you're in 5th, but maybe you are not?

No the gears shift smooth, And yes it's for sure in 5th gear because 4th gear at 55 its like 4-5k. I just replaced the clutch 200 miles ago as well.

gst noob · Nov 27, 2012

check for boos leaks. i bought a gsx with very bad boos leakage and in 5th geari couldent go any faster than 60 with rpms at 6500. fixed the boos leak and tada! :thumb:

Cdc1221 · Nov 27, 2012

Boost leakage has nothing to do with engine speed. It might limit the overall rpm your able to run. Engine speed is determined by gearing and road speed. Unless the clutch is slipping. Highly unlikely in the ops case though. Sounds like someone changed the differial out

*differential

VR4 Kev · Nov 27, 2012

96 GSX stock, I run 3000rpm @ 65, 3500rpm @ 75mph

I pull ~30-32mpg @ 65mph and 24-25mpg @ 75mph (highway trips, no/minimal boosting)

jrohner · Nov 27, 2012

gst noob said:
check for boos leaks. i bought a gsx with very bad boos leakage and in 5th geari couldent go any faster than 60 with rpms at 6500. fixed the boos leak and tada!

If you were at 6500 in 5th gear you were going 140 not 60. A boost leak can't change your gear ratio, it changes your air to fuel ratio.

foxracing4500 · Nov 27, 2012

jrohner said:
If you were at 6500 in 5th gear you were going 140 not 60. A boost leak can't change your gear ratio, it changes your air to fuel ratio.

that made me laugh, even if that was the case most of us would be screwed!

SlowChild3 · Nov 27, 2012

Could it be bad wheel bearings? Frozen caliper?

gst noob · Nov 27, 2012

Just Saturn I had to berry the Rpmstk get going. Fixed the boost leak and everything ran fine.

TSIflyer95 · Nov 27, 2012

Rpm's are controlled by gearing, and gearing alone. The gearing between all components is the only thing that can change rpm. If you have a different differential than stock, that would change it, or transmission. Or clutch slipping which you would know it is the clutch if you put it in fifth gear, stomp on the throttle, and rpms go up and you don't speed up. I don't think it's likely in this case because you would have other symptoms. But if you had a stuck caliper there would be more strain on the car. So something like this could be possible.

This seems right about I correct number to me though. I don't think you have any issues.

Jesse2012 · Nov 27, 2012

LxiMax said:
That doesn't sound right to me. I have an Auto, but in 3rd I sit at 2500rpm and O/D I'm at 2200rpm at 55mph.

Wow I want your transmission, my auto gst runs at 2800-3200k rpms going 55-65.

foxracing4500 · Nov 27, 2012

Jesse2012 said:
Wow I want your transmission, my auto gst runs at 2800-3200k rpms going 55-65.

mine does the same. havent driven my eclipse in a while but going downhill on the highway will the auto's go down to 1000 rpms or will they hold the rpm? I cant remember if it was my audi or eclipse that does this.

Bud92gsx · Nov 27, 2012

If only the dsm came with the taller 5th gear.

Also granny shifting will help,But as a 5 speed owner you should know that.

Archer Fabrications · Nov 27, 2012

Bud92gsx said:
If only the dsm came with the taller 5th gear.

Also granny shifting will help,But as a 5 speed owner you should know that.

EvoIII 5th gear FTW!!!!!! ( I wish we had a 6th though.)

SlowChild3 · Nov 27, 2012

TSIflyer95 said:
Rpm's are controlled by gearing, and gearing alone. The gearing between all components is the only thing that can change rpm. If you have a different differential than stock, that would change it, or transmission. Or clutch slipping which you would know it is the clutch if you put it in fifth gear, stomp on the throttle, and rpms go up and you don't speed up. I don't think it's likely in this case because you would have other symptoms. But if you had a stuck caliper there would be more strain on the car. So something like this could be possible.

This seems right about I correct number to me though. I don't think you have any issues.

So your saying a truck pulling 10k lb trailer at 55 mph will run the same RPMs as one without a trailer? That doesn't make sense to me. Maybe im just over thinking it. Don't mean to clutter up the post.

AngelOfPassion · Nov 27, 2012

SlowChild3 said:
So your saying a truck pulling 10k lb trailer at 55 mph will run the same RPMs as one without a trailer? That doesn't make sense to me. Maybe im just over thinking it. Don't mean to clutter up the post.

Unless the tires are spinning (loss of traction) yes. If you are going 55mph in 3rd gear it doesn't matter if you are pulling 15 trailers or not you will still be at the same RPM until you change gears...

It's just harder for the vehicle to get up into the rpm range so you have to give it more gas. That's why you use lower gears (or a bigger engine with more lower end torque) because in a lower gear you are in higher RPMs to get up to speed.

white92talontsi · Nov 27, 2012

Running the taller Evo 5th will actually hurt mpg. These cars get the best fuel mileage around 3,000 rpm.

andrew k · Nov 27, 2012

AngelOfPassion said:
Unless the tires are spinning yes. If you are going 55mph in 3rd gear it doesn't matter if you are pulling 15 trailers or not you will still be at the same RPM until you change gears...

It's just harder for the vehicle to get up into the rpm range so you have to give it more gas. That's why you use lower gears (or a bigger engine with more lower end torque) because in a lower gear you are in higher RPMs to get up to speed.

yep.. its either load vs torque. or speed vs rpm gears are non variable with a properly functioning manual transmission and clutch, unless you take the trans out and physically put different gears in it.

jrohner · Nov 27, 2012

SlowChild3 said:
So your saying a truck pulling 10k lb trailer at 55 mph will run the same RPMs as one without a trailer? That doesn't make sense to me. Maybe im just over thinking it. Don't mean to clutter up the post.

with a manual trans, the engine basically has a direct connection to the wheels, so there is no way it will change depending on load. An auto, torque converter slippage will play a roll -- more load will equal more RPM to a point (not counting lock-up).

my dreamt dsm · Nov 27, 2012

That's odd. Majority or normal 2g turbo dsm 3000k rpm should be right around 70mph.
In the honda world when b16a tranny are switch with ls tranny's rpm do change. You should see if you have the right transmission LOL

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