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Top end speed run.


 
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timk225
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Post: #1   PostPosted: Sun Apr 28, 2013 9:46 am    Post subject: Top end speed run. Reply with quote

I took my 5 SXT ATX out for a top end speed run yesterday. It's all stock except for a 1st gen DOHC style muffler (Walker Quietflow 3), and the airbox resonator is removed, and a K&N filter in the stock airbox.

On a long flat piece of road, I made it up to 109 before having to get on the brakes, as some idiot was in my lane. But going from 100-109 took a good 1/4 mile. This thing has no top end at all! I wanted a 50 hp nitrous shot badly for that speed run.

It was running about 4300 rpm in top gear at 109, so it should have been in the power range, according to what I read on stock motors.

I have a Pacesetter header and new Magnaflow 2-1/2" cat to install next weekend, I hope it does better in a top end run after that.

A friend with a 3 SXT 5 speed said he had no problem hitting the 120 mph cutoff.
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occasional demons
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2001 Dodge Neon ES

Post: #2   PostPosted: Sun Apr 28, 2013 10:44 am    Post subject: Re: Top end speed run. Reply with quote

timk225 wrote:


On a long flat piece of road, I made it up to 109 before having to get on the brakes, as some idiot was in my lane.



Most likely what the other person was thinking too.
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JeffM
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2004 Dodge SRT-4

Post: #3   PostPosted: Sun Apr 28, 2013 1:10 pm    Post subject: Reply with quote

Just wondering, why are you shooting for the top end? The non-R/T PCM is limited to 118mph, and you'll have trouble hitting that even on a downhill. Improving a 9mph range that high up sounds a little silly and any mods to improve that would only hurt your low end.
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timk225
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Post: #4   PostPosted: Sun Apr 28, 2013 7:42 pm    Post subject: Reply with quote

Well I'm not going to build the car for top end only, I was just disappointed that it had so much trouble with top end acceleration. It was good to 80, ok to 90, and then it took a while to get to 100 and even longer to 109.

My 1989 2.5 Turbo 5 speed Spirit ES easily hit its 120 mph speed limiter and would have gone over 130 with no problem when it was intercooled and on 12 psi boost.
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occasional demons
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Post: #5   PostPosted: Sun Apr 28, 2013 8:02 pm    Post subject: Reply with quote

Not really an apples to apples comparison there.

The 2.5 more than likely had a ton more torque, and no oil pump in the trans consuming power.

An MTX is going to get up to speed faster on that alone. That extra parasitic loss on an engine, that is at the end of it's power band, fighting wind resistance, is going to take a hit with something that even consumes as little as 5 hp.

Now on a vehicle that is an absolute brick, it may not matter, because the drag will kill either, before it gets to that point. Given both engines are equal.
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Moved: Mon Apr 29, 2013 4:51 am by Danteneon
From General 2nd Gen Discussion to Naturally Aspirated
akirony
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2003 Dodge Neon SXT

Post: #6   PostPosted: Mon Apr 29, 2013 5:18 pm    Post subject: Re: Top end speed run. Reply with quote

occasional demons wrote:
timk225 wrote:


On a long flat piece of road, I made it up to 109 before having to get on the brakes, as some idiot was in my lane.



Most likely what the other person was thinking too.

laughing3
But seriously what are you expecting from an ATX economy car? Of course theres no top end Quotes WHY because gas saving city car. Its only a 4spd too isnt it? 4spd+132hp+sxt pcm=slow car. Not trying to slam you or anything but these are basics you should know if you wanna go fast.
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INVUJerry
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Post: #7   PostPosted: Wed May 15, 2013 2:03 am    Post subject: Reply with quote

My 5 speed 05 sxt could get to the cutoff reasonably well. That ATX is a parasite to any power. And why are you worried about going 100+?
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timk225
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Post: #8   PostPosted: Thu May 16, 2013 7:49 pm    Post subject: Reply with quote

I don't plan to go over 100 mph every day, but it is a benchmark to measure modifications and improvements by.

0-75 multiple times a day is common for me.
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