Acceleration problems above 100mph?
10-14-2004, 08:37 PM
#26
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Originally Posted by black-rx8-msbodykit
i trade my stock engine for the rx7 twin turbo engine, it was from my friends's gf 's rx7, she put a corvette engine to her rx7 so she don't need her engine and i traded her. the engine fit pretty well.
10-14-2004, 09:19 PM
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Originally Posted by black-rx8-msbodykit
I have a 20b engine on my rx8, the stock engine is 1.3 and the new one i got is 2.0 and i switch the stock rx8 engine to a rx7 twin turbo engine, it is freakign FAAAAssst. but the fuel milage is not that good 
but i got the twin turbo speed 
but i got the twin turbo speed Troll...
10-14-2004, 09:30 PM
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Originally Posted by youpey
how do you tell the dealership
ya, when driving over 100 the car seems to accelerate very slowly...fix it!!
ya, when driving over 100 the car seems to accelerate very slowly...fix it!!
10-14-2004, 09:44 PM
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therm8, thanks for posting that chart (thanks, brothervoodoo, for posting a reference). I had no idea that the auto's 3rd gear redlines at 130mph. What is the source for that chart, though? Have those numbers been confirmed in real life? If that's the case, and I'm looking to maintain good acceleration, in the future I'll stay in 3rd rather than let the transmission shift itself into 4th. I suppose that will mean a decrease in fuel efficiency, however.
I'm still concerned as to whether I might have a mechanical problem. Since I'm still under warranty, I think I'll play it safe and heed g8rboy's advice (nevermind that you're a gator fan--sorry, I'm a die-hard UGA fan ). I'm not familiar with this sort of issue, though, and would appreciate any insight you could provide.
I'm still concerned as to whether I might have a mechanical problem. Since I'm still under warranty, I think I'll play it safe and heed g8rboy's advice (nevermind that you're a gator fan--sorry, I'm a die-hard UGA fan
). I'm not familiar with this sort of issue, though, and would appreciate any insight you could provide.
Last edited by markd; 10-14-2004 at 10:03 PM.
10-14-2004, 09:56 PM
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Originally Posted by markd
...I had no idea that the auto's 3rd gear redlines at 130mph...
10-14-2004, 10:41 PM
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Originally Posted by markd
(nevermind that you're a gator fan--sorry, I'm a die-hard UGA fan ).
).
10-15-2004, 01:56 AM
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Originally Posted by G8rboy
Hey, we're all SEC friends until TWLOCP weekend :D
Last edited by markd; 10-15-2004 at 02:57 PM.
10-15-2004, 02:00 AM
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Originally Posted by brothervoodoo
Well, that data is flawed, but it seems "therm8" got to about 122 with the paddle shifters in 3rd..
10-15-2004, 10:32 PM
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Originally Posted by red_rx8_red_int
It's not just a problem with AT. My MT is slower at accelarating at high speeds. It's called drag. First gear WOT has a higher g effect than 3rd or 4th gear WOT.
10-15-2004, 10:44 PM
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Originally Posted by StewC625
One simple explanation ... 198 horsepower there...
10-16-2004, 09:45 PM
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I didn't bother reading the whole thread, but I can tell you that a 1994 Integra LS sedan can hit 132 with only 140hp so I'm sure the auto RX-8 can get up there. (Then again the Integra was a 5sp manual.)
10-16-2004, 10:08 PM
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why don't some of the engineers come out of the woodwork and figure out the drag/road friction and such and count for the gearing at that speed and figure if there should be a noticeable drop in acceleration.
10-18-2004, 01:20 PM
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Originally Posted by therm8
auto, and I just noticed your complaint was with 4th gear accel. 4th gear ratio is 0.69, 3rd is 1.00 so there would be a noticeable decrease in acceleration upon shifting to 4th
here's something that was posted a while ago, regarding gear ratios
here's something that was posted a while ago, regarding gear ratios
Last edited by markd; 10-18-2004 at 01:24 PM.
10-18-2004, 09:51 PM
#42
Originally Posted by G8rboy
Yes, drag does play a big role, but going from 100-115 in 4th gear is pretty damn quick in my 6 speed... almost too quick. It's like crack. Need more... :D
10-22-2004, 12:04 PM
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I thought I would revive this thread to give a quick update on the diagnosis the dealer gave me today of my engine problems. I've actually had 2 issues related to my engine: 1) slow acceleration, discussed above, and 2) a loud rattling noise when I punch my A/T above 5,000 rpms in any gear. The initial culprit: 87 octane fuel.
Like a number of threads have mentioned before (though it was hard to pinpoint just from reading them b/c apparently "pinging"="knocking"="rattling"=any other adjective you can think of to describe an engine sound), the lower-grade fuel negatively affects the compression ratio and screws up the combusion timing (hope I used the correct terminology). They said the loud and annoying rattling noise was from spark plug misfire, and the very slow acceleration in 4th gear (a/t's highest gear) was, therefore, a direct consequence. In other words, performance (and, I fear, engine life) have been compromised at the expense of money saved at the pump.
We still don't fully know if this is what is really happening until I go through a few cycles of 93-octane fuel, but after experiencing these problems at only 4500 miles, though my wallet will hate me from here on, I'm becoming a firm believer that only the higher-octane fuels are good for the engines in our 8's.
PS. I just realized this thread should probably be moved to the Tech Garage... :o
Like a number of threads have mentioned before (though it was hard to pinpoint just from reading them b/c apparently "pinging"="knocking"="rattling"=any other adjective you can think of to describe an engine sound), the lower-grade fuel negatively affects the compression ratio and screws up the combusion timing (hope I used the correct terminology). They said the loud and annoying rattling noise was from spark plug misfire, and the very slow acceleration in 4th gear (a/t's highest gear) was, therefore, a direct consequence. In other words, performance (and, I fear, engine life) have been compromised at the expense of money saved at the pump.
We still don't fully know if this is what is really happening until I go through a few cycles of 93-octane fuel, but after experiencing these problems at only 4500 miles, though my wallet will hate me from here on, I'm becoming a firm believer that only the higher-octane fuels are good for the engines in our 8's.
PS. I just realized this thread should probably be moved to the Tech Garage... :o
Last edited by markd; 10-22-2004 at 12:10 PM.
10-24-2004, 11:34 AM
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To go back to the speed question, speeding more than 20 MPH over the limit (25 MPH in some states) is usually considered reckless driving, which is bad, bad news for your license...
10-24-2004, 02:23 PM
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Well I have gotten my Auto RX8 up to 125mph.
It was unbelievable. Its like there is no power up at that speed anymore.
One of the many reasons I want the 6 speed.
It was unbelievable. Its like there is no power up at that speed anymore.
One of the many reasons I want the 6 speed.
10-24-2004, 02:45 PM
#47
If the auto's 4th gear is anything like the manual's 6th gear, acceleration over 100 mph will definately be slow. When going for speed, there isn't any reason to use 6th gear because of this and the limiter.
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