hi,

I have and 2004 ap2 and im having some problem with it...

I'm slowly losing like speed on it :S... let me put it this way, first I was running in the 2 gear (till rev) 110 KMH, but now i'm running 93 KMH!

What could that be? I really could use some help guys.

Also I've scanned the car and nothing seems to be wrong :S


Mods are, Intake AEM V2,headers,exhaust,test pipe,ACT clutch, AP1 flywheel.

Thanks.

 

That doesn't make any sense, unless your ECU is lowering your redline...

 

Slipping clutch?

I didn't think AP2 transmissions could get to 110kph in 2nd gear.

 

yea by the time you hit 60mph you should be in 3rd gear on AP2.

 

93 KPH sounds exactly right. That's about 58 MPH, which is where you should have to shift from second to third.

 

I don't know where you live. But if it is summertime where you live, then it's probably due to the high temps that are causing you to lose power. It's very noticeable to me here in Texas.

There are three things that will cause you to lose power that you have no control over...high heat, high humidity, and high altitude. These conditions cause the air molecules to thin (density) resulting in a leaner fuel/air mix=less power.

Re-evaluate your situation once the outside air temps cool down to determine whether you have a legitimate problem.

 

power has abso-friggin-lutely nothing to do with rpm vs mph.

 

Wow! I wish you were correct. But ask any aviator, boat driver, or race car driver what happens to engine performance when atmospherics change. They will all tell you that acceleration and speed drops at any given RPM when any of the "3H's" go adverse on you. RPM is nice to have, but you need torque translated to HP to go faster.

 

I believe you've misunderstood the person you quoted. He's talking about a speed at a given RPM which will not change based on weather conditions. A car will be at a specific RPM in a specific gear regardless of how quickly it gets to that speed.

Example (not exact real-world number but it'll do)-- AP2 @ 4k in 6th gear will be going 75mph on a 95 degree July day. It will also be @ 4k in 6th gear going 75mph on a 9 degree January day.

 

Your example is a good one to show that the F22C will always have enough torque to produce the required horse power at 4K RPM's to produce 75MPH. The problem that the OP is concerned about is max power speed. This is where you will see significant differences based on atmospheric changes. The torque produced by the engine at 95F versus 9F is dramatic in this little engine. So the horsepower will be much lower at 8K RPM, and the car will be slower.

An AP2 example (real world) for my 04 would be with 4th gear, since I routinely use it for passing. On a 75F day I will reach 99-100MPH at 8K RPM. On a 105F day, it will reach 93MPH at 8K RPM's.

If you ever have a chance to watch Indycar qualifying, you will always see the drivers jockeying for position for optimum track conditions (cooler track temps predominently). Even though all of their cars rev to 10,300 RPM, they will produce more power and speed if it gets cooler without changing their setup.

If you ever have a chance to take a boat from Florida (sea level) to Atlanta (3000'MSL), the Florida boat that used to do 45MPH will now be lucky to do 40MPH. That's with the same gearbox, propeller and fuel in fresh water at max RPM. Less torque, less power, less speed.

If you ever have the chance to fly aircraft, you will become intimately familiar with engine performance charts.

If you ever take