2002 6spd HS Headers Dyno
07-19-2006, 02:32 PM
#1
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Join Date: Dec 2001
Posts: 170
2002 6spd HS Headers Dyno
I am not sure how to post any graphs of my runs. Honestly, I am not really good at manipulating the graphs with this dynojet viewer anyway. My car has HS Headers and the stock airbox/filter with 3/4" holes drilled in the filter holder, similar to a setup seen on irish's cardomain page.
I am not really happy with my runs. The temperature was about 87 or 88 so that may have had a slightly negative effect. I was only able to manage about 224-225hp and 231tq. The car was pretty consistent on its three runs. Unfortunately, I didn't ever run a baseline on the car before the headers/GAB so I don't know if I should be okay with these results or not. This was all done on a 248x (up to 1800hp) at Haywood Custom Speed in Raleigh, NC.
I think I may need to do something about my a/f b/c it dipped a little below 12 near 6k and seems to be slightly rich. Maybe in relation to this, my car stalled after cranking it before the final dyno run, my car does that sometimes on hot starts after driving hard since the headers but the guy at the shop didn't think it was too big of a deal, but he also looked at the dip in my graph at 3.9k and said that must be where the wastegate was opening so idk (mustang guy, no offense). That dip on my lines does seem more extreme than others so idk if I have some problem with my intake opening right or not.
If someone can help me display my information I have the runfiles available. Thanks.
I am not really happy with my runs. The temperature was about 87 or 88 so that may have had a slightly negative effect. I was only able to manage about 224-225hp and 231tq. The car was pretty consistent on its three runs. Unfortunately, I didn't ever run a baseline on the car before the headers/GAB so I don't know if I should be okay with these results or not. This was all done on a 248x (up to 1800hp) at Haywood Custom Speed in Raleigh, NC.
I think I may need to do something about my a/f b/c it dipped a little below 12 near 6k and seems to be slightly rich. Maybe in relation to this, my car stalled after cranking it before the final dyno run, my car does that sometimes on hot starts after driving hard since the headers but the guy at the shop didn't think it was too big of a deal, but he also looked at the dip in my graph at 3.9k and said that must be where the wastegate was opening so idk (mustang guy, no offense). That dip on my lines does seem more extreme than others so idk if I have some problem with my intake opening right or not.
If someone can help me display my information I have the runfiles available. Thanks.
07-19-2006, 05:28 PM
#3
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Join Date: Dec 2001
Posts: 170
I know my post was a little long so you probably didn't get to the last line but yeah I do have the runfiles. The Max HP came at around 5700 rpms. Max TQ was about the same at 3600 and then 4800 as well. There is a huge drop in TQ at 3900 RPMs (about 30 ft-lbs from what it was at 3600). CF was 1.01SAE. I can email runfiles to somebody if they would like to help post graphs or decipher results.
07-19-2006, 05:47 PM
#4
Email runfiles to puppetmazta@yahoo.com, if you please. I'll post the graphs for you.
07-19-2006, 06:12 PM
#8
At first glance, the numbers are low compared to others with similar set-ups, but those were all done at different times and in different conditions with different mods so its hard to compare really.
It is rich pretty much all the way across, so maybe some AF tuning to lean it out a bit will net a bit more power. I think people have had the most success with the AF flat at around 13 to 13.5.
It is rich pretty much all the way across, so maybe some AF tuning to lean it out a bit will net a bit more power. I think people have had the most success with the AF flat at around 13 to 13.5.
07-19-2006, 06:15 PM
#9
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Do you think the numbers are still low considering I am still stock from the cat back and my intake is just holes in the filter holder with a stock filter? I was thinking they were a little even considering all that.
Edit: Also, do you think the dip in tq and hp at the switchover is normal? And do you think that my AF is rich enough to where my gains would be enough to make buying and wiring and tuning an AFC worthwhile? Would changing the intake affect AF, b/c I have since went with a berk midpipe and some cheap OBX filter.
Edit: Also, do you think the dip in tq and hp at the switchover is normal? And do you think that my AF is rich enough to where my gains would be enough to make buying and wiring and tuning an AFC worthwhile? Would changing the intake affect AF, b/c I have since went with a berk midpipe and some cheap OBX filter.
07-19-2006, 06:24 PM
#11
Originally Posted by dlee275
Also, do you think the dip in tq and hp at the switchover is normal? And do you think that my AF is rich enough to where my gains would be enough to make buying and wiring and tuning an AFC worthwhile? Would changing the intake affect AF, b/c I have since went with a berk midpipe and some cheap OBX filter.
Yes, you could benefit from an AFC....
And yes the intake set-up does affect A/F... for me it did...
07-19-2006, 06:26 PM
#12
Originally Posted by dlee275
Do you think the numbers are still low considering I am still stock from the cat back and my intake is just holes in the filter holder with a stock filter? I was thinking they were a little even considering all that.
Edit: Also, do you think the dip in tq and hp at the switchover is normal? And do you think that my AF is rich enough to where my gains would be enough to make buying and wiring and tuning an AFC worthwhile? Would changing the intake affect AF, b/c I have since went with a berk midpipe and some cheap
OBX filter.
Edit: Also, do you think the dip in tq and hp at the switchover is normal? And do you think that my AF is rich enough to where my gains would be enough to make buying and wiring and tuning an AFC worthwhile? Would changing the intake affect AF, b/c I have since went with a berk midpipe and some cheap
OBX filter.
The dip is normal at the VIAS switchover. And yes, AF is rich enough to warranty some sort of AF adjustment. Wiring a SAFC-II or VAFC-II is easier than you think. You will need more dyno time getting it tuned though, unless you can street tune with a wideband of some sort.
07-19-2006, 06:36 PM
#15
Against my better judgement, I'm going to post a comparison graph of your best run with Jimmycapp's best run. Bear in mind he did his in completely different conditions as well. His thread is here:
http://forums.maxima.org/showthread.php?t=433516
Once again, it is a crude comparison, just for some reference.
Interestingly enough, his AF is very close to yours.
http://forums.maxima.org/showthread.php?t=433516
Once again, it is a crude comparison, just for some reference.
Interestingly enough, his AF is very close to yours.
07-19-2006, 06:39 PM
#16
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Join Date: Dec 2001
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Damn...is there a way you can look at his environment while testing? Also, do you think since I now have a midpipe/generic filter that it would be worth me going back for another few runs? Now that I think about it, since his A/F is so close to mine does that mean that I really wouldn't benefit much from having the hybrid like he was running with?
07-19-2006, 06:49 PM
#17
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Nevermind about the conditions...I found them in the runfile in the link you provided. He was at about 80 and his humidity was a lot higher than mine too. Like you said though, different dynos and many other factors...but the shape of the curves are remarkably similar, AF and the HP and TQ all.
Also, his A/F is actually slightly more rich than mine, despite the intake. So in his case it didn't seem to help his A/F.
Also, his A/F is actually slightly more rich than mine, despite the intake. So in his case it didn't seem to help his A/F.
07-25-2006, 07:03 PM
#19
Originally Posted by Bruceman
Should definately see a difference in cooler weather
He'd proabably see better Uncorrected #'s in cooler weather, but not SAE..
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