G35 Sedan V35 2003-06 Discussion about the 1st Generation V35 G35 Sedan

Why is my car so slow?

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  #31  
Old 01-11-2009 | 11:56 PM
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From: Puerto Rico
Originally Posted by canucklehead
get your car tuned/or diagnostic check. something must be wrong to see 15+ consistently, unless you had a bad run. ~1600' is not enough altitude to run that slow.

lots of good suggestions in the other replies, but to gain .5-.7 seconds you need some serious improvements, or determine what is wrong with your ride.

just for reference, i ran my car once at the 1/4 mile track nearby (~500') on a hot summer night and saw 14.3 @ 98+, with a 2.1 60'. i'm essentially stock.
My car doesn't currently have a check engine light on and it runs beautifully so either the engine is simply tired or maybe a cat is clogged up? LOL... I have testpipes I haven't installed yet.

I would get a tune but they seem awefully expensive for these cars...
 
  #32  
Old 01-12-2009 | 12:02 AM
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Originally Posted by GT-ER
I shifted to 4th but at the end of the track holding it or shifting would probably have barely done a difference. My launch is the what would make a world of a difference....If I could only get it to launch well.
actually it does make a difference... hold 3rd the whole way - you'll need to shift near redline each gear to make it through in 3rd... if you still have 3.3 FD you'll be fine... if you have your rev limiter bumped it will be easier.
 
  #33  
Old 01-12-2009 | 12:34 AM
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I heard that if you put your car in neutral, press the brake down, rev the motor past 5k, then put the car back in drive and don't let the brake up. Then when you powerbrake it tricks the computer and the car will launch harder. Let me clarify something though I'm not saying to neutral drop your car. Hold break-rev past 5k-holding brake after the revs come down-put into drive-powerbrake to launch...
 
  #34  
Old 01-12-2009 | 12:38 AM
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Originally Posted by darren03
I heard that if you put your car in neutral, press the brake down, rev the motor past 5k, then put the car back in drive and don't let the brake up. Then when you powerbrake it tricks the computer and the car will launch harder. Let me clarify something though I'm not saying to neutral drop your car. Hold break-rev past 5k-holding brake after the revs come down-put into drive-powerbrake to launch...
that pre-loads the trq converter... there is nothing (trust me) that has tricked the ECU into not cutting throttle when brake and accelerator is applied... but it's coming
 
  #35  
Old 01-12-2009 | 12:41 AM
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I saw that somewhere but I couldn't remember what it did.
 
  #36  
Old 01-12-2009 | 02:11 AM
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Originally Posted by GT-ER
I shifted to 4th but at the end of the track holding it or shifting would probably have barely done a difference. My launch is the what would make a world of a difference....If I could only get it to launch well.
It makes about .2 seconds difference and 2mph in trap. Believe me, I've tried it.
 
  #37  
Old 01-12-2009 | 02:14 AM
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Originally Posted by darren03
I heard that if you put your car in neutral, press the brake down, rev the motor past 5k, then put the car back in drive and don't let the brake up. Then when you powerbrake it tricks the computer and the car will launch harder. Let me clarify something though I'm not saying to neutral drop your car. Hold break-rev past 5k-holding brake after the revs come down-put into drive-powerbrake to launch...
Yes, it allows you to build a little more launch rpm. Unlike OCG35, my 03 G does far better in the 60 foot when I stall the TC for about 1 second. Launching off idle nets high 2.2 to lower 2.3s and it's bog city. A flash stall of the TC results in mid 2.1s to low low 2.2s. It's the difference between running a 14.3-14.4 and running a 14.6-14.7 in my car.
 
  #38  
Old 01-12-2009 | 05:23 PM
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^^^ interestingly, I'm exact opposite - off idle best 60' is high 2.1+... brake trq is usually 2.2-2.3

One thing is for sure (and wont vary) – once UpRev fixes the throttle cut, we will all have the ability to launch better = better 60’
 
  #39  
Old 01-12-2009 | 05:53 PM
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all have good points.

few things i want to add is that DA 1100 auto G should easilty be in 14s and trap atleast 95 mph.
Clean you airfilter/maf sensor/throttle body.
Do a fuel treatment and run with 101 octane for one tank to clean crap off.
Make sure have 91+ octane gas in it.
No one should be in the car when u are running.

Back in a day I was running 14.9 with my stock G with over 4000 DA in palmdale, CA.
 
  #40  
Old 01-12-2009 | 07:16 PM
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OP - FYI:

I ran a calculation to correct my 1/4 mile time and speed for my 1937' DA. for your reference, the corrected numbers were: 14.0 @ 100.2mph. The track times were 14.3X @ 98mph (465', 77F air, 30Hg, 64 dew). this may help you get a baseline of where your car should be performing.

you can find a good calculator at:

http://www.dragtimes.com/da-density-...calculator.php

this is what their calculator estimated your FLYWHEEL h/p at:

1/4 mile time:15s

Trap Speed:92mph

Weight of vehicle
with driver (pounds):3600 (i used my vehicle/driver weight in lieu of yours)

Horsepower @ flywheel = 214.81 HP (uncorrected numbers used)

...so something is not right...
 

Last edited by canucklehead; 01-12-2009 at 08:32 PM.
  #41  
Old 01-12-2009 | 07:52 PM
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I'm going to clean the maf and run a fuel system cleaner. Plus I have the test pipes waiting to get installed. After that I'll go at it again. If the gains aren't somewhat large then screw it....I'm going turbo...LOL.
 
  #42  
Old 01-12-2009 | 08:05 PM
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Check your plugs if they are original. I know plats can go 100K, but most cars i've yanked the plugs out at around 75K show some sort of wear. I wouldn't say it's your prob, but with 87K miles, it might be time if they are OEM original
 
  #43  
Old 01-12-2009 | 08:25 PM
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From: OC - So Cal
Originally Posted by canucklehead
OP - FYI:

I ran a calculation to correct my 1/4 mile time and speed for my 1937' DA. for your reference, the corrected numbers were: 14.0 @ 100.2mph. The track times were 14.3X @ 98mph (465', 77F air, 30Hg, 64 dew). this may help you get a baseline of where your car should be performing.

you can find a good calculator at:

http://www.dragtimes.com/da-density-...calculator.php

this is what their calculator estimated your FLYWHEEL h/p at:

1/4 mile time:15s

Trap Speed:92mph

Weight of vehicle
with driver (pounds):3600 (i used my vehicle/driver weight in lieu of yours)

Horsepower @ flywheel = 214.81 HP

...so something is not right...
Nice! I love that calculater - thanks for sharing!!!

My best corrected says: 13.697 @ 103.608 MPH
 
  #44  
Old 01-13-2009 | 12:05 AM
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Originally Posted by Mustang5L5
Check your plugs if they are original. I know plats can go 100K, but most cars i've yanked the plugs out at around 75K show some sort of wear. I wouldn't say it's your prob, but with 87K miles, it might be time if they are OEM original
I replaced the plugs when I did the tune up.

I'll have to go again and give it another whirl. Thanks guys.
 
  #45  
Old 01-13-2009 | 12:07 AM
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You have a fat chick in the car?
 


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