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Old 04-19-2009, 09:18 AM   #1
b0nd18t
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Default STi on the drag strip not reaching potential? - help

I took my sti to the local 1/4 mile drag strip and wasnt getting the numbers I expected. I'm no stranger to drag racing. Ill post my full slip later when i get home but my best was 12.9s @ 104mph. I got 104mph when i was stage 1. My 60' was 1.7x on that run as well. I tried to log some parameters but it was my first time logging with AP and i messed it up. I shifted very quickly and pretty close to 7000rpm and finished out in 4th gear with room. I expected to get around 12.5s @ 108mph. 75 degrees out. Any input ?
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Old 04-19-2009, 09:35 AM   #2
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you have a VF43, correct? shift at about 6k 2-4, reving to 7k with that little turbo just kills your times

GL
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Old 04-19-2009, 09:37 AM   #3
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yes VF43 stock turbo. Yeah i figured the only thing that could be wrong was shifting too late because I was nailing everything else pretty good. I wouldnt think its a mechanical issue either since i was just protuned a few weeks ago and an issue would have been reveiled there. Here is my dyno plot, should i shift even a tad sooner than 6000rpm like 5900?


Last edited by b0nd18t; 04-19-2009 at 10:45 AM.
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Old 04-19-2009, 08:20 PM   #4
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Quote:
Originally Posted by b0nd18t View Post
yes VF43 stock turbo. Yeah i figured the only thing that could be wrong was shifting too late because I was nailing everything else pretty good. I wouldnt think its a mechanical issue either since i was just protuned a few weeks ago and an issue would have been reveiled there. Here is my dyno plot, should i shift even a tad sooner than 6000rpm like 5900?

Post a slip so we can see if and where you went wrong.
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Old 04-19-2009, 08:51 PM   #5
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Post a slip so we can see if and where you went wrong.
seconded, a slip will tell us more info.
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Old 04-19-2009, 09:11 PM   #6
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On another note, how does this dyno read in comparison to a dyno-jet? I believe close, right? Even with intermediate driving your power should be good enough for 110-111.

You already know you shifted late, but that wouldnt hurt you this much. For future track days, shift at 6300. That alone should be good for another .1-.15. and another 1mph.
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Old 04-19-2009, 10:24 PM   #7
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1.728 60'
5.3096 330'
8.2626 1/8 ET
81.92 1/8 mph
10.8355 1000 ET
12.98 1/4 ET
104.77 1/4 mph
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Old 04-19-2009, 10:28 PM   #8
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Quote:
Originally Posted by b0nd18t View Post
1.728 60'
5.3096 330'
8.2626 1/8 ET
81.92 1/8 mph
10.8355 1000 ET
12.98 1/4 ET
104.77 1/4 mph
Either you're shifting very slow or those dyno numbers are highly inflated.... the power just doesn't seem to be there...
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Old 04-19-2009, 10:31 PM   #9
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ive seen similar modded 07 sti's get low 12s and 110mph, tuned at the same place as me. I shifted quick, my power drops off at 5900rpm and i shifted at 7000rpm, not sure how much that would compensate for.
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Old 04-19-2009, 10:34 PM   #10
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Quote:
Originally Posted by b0nd18t View Post
1.728 60'
5.3096 330'
8.2626 1/8 ET
81.92 1/8 mph
10.8355 1000 ET
12.98 1/4 ET
104.77 1/4 mph
Wow dude?!?! On pump to the 1/8th i trap 9 mph more than you

In all honesty with everything considered here, you drove the car very well. Its not you, but it is definitely the car man. Get it checked out ASAP.

12.9 @ 104 is the sole indication of very good driving here BTW.
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Old 04-19-2009, 10:42 PM   #11
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i sent Hill (tuner) an email to see what he thinks happened. Depending on his opinion i might find a stretch of road i can do some logs on.
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Old 04-19-2009, 10:47 PM   #12
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320hp does not get you much anymore. I think something is definatly wrong there. I went 12.6 @ 107 with only 296/323
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Old 04-19-2009, 10:48 PM   #13
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In comparison I ran the 1/8th with a OTS Stage 2 map on my 02 wrx 8.459@82 mph....

I'm willing to be your getting some sort of knock feedback 2-4th gear...

-Jerod
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Old 04-19-2009, 10:55 PM   #14
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Originally Posted by Dirtyhobo010 View Post
320hp does not get you much anymore. I think something is definatly wrong there. I went 12.6 @ 107 with only 296/323
Eh, that dyno is just inflated... My #'s are exactly like his sometimes lower and higher speeds, and i only put down 262/286



hopefully this problem gets resolved....
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Old 04-19-2009, 10:55 PM   #15
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Quote:
Originally Posted by JSarv View Post
In comparison I ran the 1/8th with a OTS Stage 2 map on my 02 wrx 8.459@82 mph....

I'm willing to be your getting some sort of knock feedback 2-4th gear...

-Jerod
holy crap it has to be pulling timing to be in the same boat as ots stg2 wrx. what would cause knock? i dont think there is a mechanical issue im trying to pin it on how i drove it.

Forget my whp/wtq #'s, i KNOW guys with similar mods tuned on the SAME dyno are much quicker as posted on nasioc.
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Old 04-19-2009, 10:57 PM   #16
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Quote:
Originally Posted by JSarv View Post
In comparison I ran the 1/8th with a OTS Stage 2 map on my 02 wrx 8.459@82 mph....

I'm willing to be your getting some sort of knock feedback 2-4th gear...

-Jerod
absolutely, something is going on here.

Jerod, hope your getting some sleep bud
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Old 04-19-2009, 11:06 PM   #17
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Quote:
Originally Posted by STi Mikey View Post
absolutely, something is going on here.

Jerod, hope your getting some sleep bud
To the OP - hitting cells in your tune that were not tuned on the dyno (timing cells) pretty easy to do - best way to tune for dragstrip is log the run and tune from there if you use open source... I had to do some work on mine but other than that it was pretty much an ots map...

My run was Launch Control and 1000's of runs down that same track in my beater 1.5l 85hp civic!

Mikey - hes sleeping on my chest and puking all over me right now... Going to head to bed soon I hope!
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Old 04-20-2009, 01:39 AM   #18
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Were you heatsoaked to hell? You could put some ice on your intercooler and things. There are lots of variables at the track
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Old 04-20-2009, 02:20 AM   #19
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if you post a log from 2000rpm-redline, logging at least RPM, I can create a dyno plot that is pretty accurate. I think you did a pretty decent job at the track, but I suspect your overall power is not what the dyno shows and that is the main cause of the lower MPH.
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Old 04-20-2009, 02:29 AM   #20
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Originally Posted by wrxsti.l View Post
if you post a log from 2000rpm-redline, logging at least RPM, I can create a dyno plot that is pretty accurate. I think you did a pretty decent job at the track, but I suspect your overall power is not what the dyno shows and that is the main cause of the lower MPH.
Or his car could just not have been running right that day or something went wrong like bad tank of gas pulling timing or something. He ran a 104 trap with a stage 1 map. That is pretty good, so something was either wrong with the day he went to the track or the tune was bad. Not knocking the tuner, just stating that something was wrong.

Last edited by k04sti; 04-20-2009 at 03:08 AM.
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Old 04-20-2009, 02:51 AM   #21
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Or nothing was wrong and he ran a great time for the power he had
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Old 04-20-2009, 03:08 AM   #22
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Or nothing was wrong and he ran a great time for the power he had
Well if he ran a 104 at stage 1 and the same trap with a tbe protuned, I believe there is a problem. Maybe the problem is your reading skills.
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Old 04-20-2009, 03:16 AM   #23
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Quote:
Originally Posted by k04sti View Post
Maybe the problem is your reading skills.
Wouldn't be the first time I misread something

How much power did he make at stage 1? Is that the lower power line in his dyno? Something weird with that graph - but anyhoo.

Maybe he had a leak somewhere and was not making full boost and power?
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Old 04-20-2009, 03:26 AM   #24
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Originally Posted by wrxsti.l View Post
Wouldn't be the first time I misread something

How much power did he make at stage 1? Is that the lower power line in his dyno? Something weird with that graph - but anyhoo.

Maybe he had a leak somewhere and was not making full boost and power?
Yea, something was not right, because if he trapped the same as stage 1 then I don't know. Bad tank of gas can definitely do the trick. Heatsoaked to hell or something.
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Old 04-20-2009, 07:30 AM   #25
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To be honest, you really can't compare times with people on nasioc. So many factors play into your times, it's hard to say where you're car should be.

I've found most people on here that I have talked to about their times leave out a few important factors such as the fuel they were running and what temporary weight reduction/mods were done to the car.

Not to mention, I may have missed where you put your mods in this post...
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