This has been bothering me for a while. I wanted to figure out what to upgrade to beat the 115 limit. I don't mean by disabling the VSS and destroying the engine. The engine only goes to 115 because it hits its redline in rpms at that speed. I wanted to figure out how to lower the rpms at the same speed so it will go faster than 115. I dont know if I have to upgrade the crankshaft, camshaft, or simply put bigger gears in the trans or what trans would swap in without any modifications for the 3.4l?

 

could have it tuned. what trans you have.

 

If the engine is hitting the red line (RPM limit) at 115 MPH, either the gages are reading wrong, or the transmission is either slipping or failing to shift to top gear, or some one substituted rear end gears. In stock condition these car came with a speed limiter set to around 115 MPH, and if you want the car to go faster, the PCM will have to be reprogrammed to delete the speed limiter, or to change the speed limiter setting. Do not change the rev limiter setting unless the engine has been modified for higher RPM, unless you want the thrill of breaking the engine. Keep in mind that if you intend to cruise at 115 MPH, the tires will have to be upgraded to tolerate the higher speed without blowing out. Then again, a stock 3.4 does not have the power to push the car much faster than what you are getting.

 

Its the stock trans for the 3.4l 4 speed auto camaro. a 460E or something? I forget off the top of my head.
And yea, I knew about the tires, I was getting new ones to handle the speed. I have done some modifications to my camaro and it can easily hit 115 and seems like it would keep going just fine. But the speed limiter kicks in. I noticed that Im around 5500 rpms at 155mph. If I just take out the speed limiter, than Ill just cook and blow the engine at that high of rpms. So I didnt know if I needed bigger gears in the trans so the rpms arent so high at the speed or if it was an engine modification I need to perform.

 

You can forget about getting different transmission gears, but you can change the final drive gears in the rear end. Deleting the speed limiter is not going to harm the engine as the Rev limiter will prevent the engine from over revving. I suggest you first check the tach and the speedo and make sure they are indicating correctly.

 

Wow this thread is confusing, first you say you RPMs are red lining then you say your hitting your speed limit limiter. Your first post would indicate there is something wrong with your car. You should not be at 5500 RPMs at 115 MPH. (I am making some assumption about your car) Later you say at 155 MPH you should be going 5500 RPMS. But your worried about blowing you motor.
The way it should work with a stock car. At 115-121 MPH you should hit you speed limiter and at that point you should around 4K RPMs.
To go faster step one would be to eliminate the Speed limiter by tune. I will assume you did the math and you are worried about over reving your motor. Don’t worry you do not have enough HP to push your car 155 MPH (you will not get to 5500 RPMS). These car are great for aerodynamics but IMO your going to need at least 230 RWHP to break 150. Once you hit about 130 the amount of HP need to push the car faster rises very quickly the jump from 120-130 MPH may only take 20HP then the jump from 130-140 may require 35 more HP then the jump for 140-150 HP may require another 60 HP. My guess would be the 3.4 would make it to about 132-135 MPH but a 200 HP 3800 might only be 4-6 MPH more. Without the HP gearing is not going to help you.

 

Alright, Im getting a new gauge cluster so Ill see if that was the problem. It was saying 5500rpms at 115mph for some reason. Ill let you know what happens when I get the new cluster.

 

What makes you think that your gauge cluster is faulty?

Do you have a GPS unit? If you do, you can use it to see if your speedometer is reading correctly.

I wouldn't worry about the tach too much. The rev limiter will protect your engine from the occasional high rpm run. If you are concerned about the tach reading right, you can get a cheap tach from eBay that you only need access to one plug wire to use. It will help you determine if the tach is reading accurately.

Now, if you are sending it to the red line on a regular basis, then not even the rev limiter will prevent a catastrophic failure for long.

 

If your motor is having a "lack of power" at higher RPM the PCM would pick up on the strain and down shift to 3rd gear. That would put at the 5500 RPMs.

 

115 sounds like the speed limiter on the v6 cars. The rev limiter is around 6200-6500. I've bounced off it a few times by accident. 5500 and 115 mph sounds like a 3rd gear speed limit. The 3.4l cars don't have the power to push any faster going into od. Even the 3.8 have hard times.