So I can't be too sure if this has been happening for awhile now or not, but I definitely seem to have noticed it more recently.

Just a couple quick notes also:
- It's a 2010 GSR, roughly 56000 km on it
- It is winter; however the temperature hasn't been too low lately (-15 to 0 deg C)
- I have a COBB turbo back, a drop-in filter element, and COBB intercooler hard-piping kit
- I am currently running the stage 2 91 oct map on the AP for the winter (normally run the 93 in summer)

When I am cruising just above 2500 rpm in 5th, I can slightly load it up with just a bit of throttle, and when I let off just enough to maintain the current speed, i get this really strange stutter. It feels almost like what would happen if you could quickly flutter the throttle.

It only seems to happen in 5th, and only when the loading is changed ever so slightly around that RPM range. Also, this could be all in my head, but it feels like it may be gradually getting worse.

Any ideas about this issue would be greatly appreciated! Thanks in advance guys!

 

Sounds to me like the compressor bypass valve (aka diverter valve or "blow-off" valve) is opening. Most people learn to avoid little lifts so it doesn't happen. Others replace the valve with one that requires more vacuum to open.

Other possibility is the solenoid on the line to the wastegate.

 

Downshift. Stepping on the gas in 5th gear at 2600rpm is very dangerous.

 

Why would that be dangerous?

 

Go punch ur X in 5th gear at 2k rpms and see how long that motor lasts

 

High load in low speed is best way to bend rods.

 

I'm glad you guys got a chance to teach people to avoid WOT at low RPMs, but that has zilch to do with this thread. This is about light throttle and gentle lifts from part throttle.

 

Which can also be solved by simply downshifting. There is no reason to be cruising at 2500rpm. If you have to press the gas for any reason to avoid a collision there will simply be no power available and you won't be going anywhere.

 

Argh.

Can you really think of no reason to cruise at 2500 RPM in 5th, instead of 3600 in 4th? None?

 

Enlighten me. 2500rpm = no power, bad gas mileage. I get the best gas mileage cruising around 3800rpm in 5th gear. The only benefit is maybe a little less noise? But I didn't buy an evo and modify the exhaust because I wanted a quiet car.

 

It's normal. Like others said, I learned to avoid lifting the throttle while in 5th gear and low rpms.

 

 

Speak for yourself. The non-interstates around me, I end up around that powerband. Do I punch it even though I very realistically could? No. But am I going to say there's NO reason? No. You do have power there, and please enlighten us as to how you get great mileage at 3800 rpm in fifth, which should be around 75 mph. Best mileage on a stock turbo/stock injectors evo x ended up being around 3200 rpm for me, between 60-65 mph in fifth.

 

I understand using low RPM to save on gas. The lower the better. But I also know not to punch it but downshift if I need to move quickly.

 

Wow so lets say there is a 40 mile speed limit, from what its been said here it would be murder to be in 5th at around 2300rpm give or take a couple???? Wow people need to learn how to drive
I guess its better to be in 4th or better yet be in 3rd cocked and loaded you never know when you need to let the "rice" out and "avoid a collision"