<font face="Verdana, Arial" size="2">Originally posted by Ludakris_SH: I'm having trouble uploading to photopoint right now. I'll post it as soon as I can.</font>
if you want to email it to me (schwett@431.org) i'll post it elsewhere for you. photopoint stinx.
Here's the pic, I'll let Ludakris fill in the data. n/m it's in the email...
"The first run was after not resetting for a long time. Most people of the 50
I saw lost 1-5 HP for the second run. The last one. I set the V-AFC to 4600
from 4800 factory. And put -3 on the fuel from 4500 up. Thanks by the way."
Is that a SS car? If not are you running any mods? It seems that most people pull those #'s stock and with a VAFC I'd think you'd see some higher numbers.
<font face="Verdana, Arial" size="2">Originally posted by Joon525: A 1 hp difference and a 1 ft-lb difference?
I was expecting a greater difference.</font>
If anyone actually LOOKS at the graph (JOON! =P) you can see big differences in the runs. Don't just look at the numbers, look at the graph itself. Torque just before VTEC and everything in the pre-vtec torque range. That's a fairly noticeable difference. But after VTEC the variations are very slight.
<font face="Verdana, Arial" size="2">Originally posted by TimeRacer: If anyone actually LOOKS at the graph (JOON! =P) you can see big differences in the runs. Don't just look at the numbers, look at the graph itself. Torque just before VTEC and everything in the pre-vtec torque range. That's a fairly noticeable difference. But after VTEC the variations are very slight. </font>
So it smooths it out......peak still hasn't changed much.....I know what you're saying TimeRacer and I noticed that before as well. (NOT a flame) Don't get me wrong though.....smoothing it out ain't bad. I was just expecting something TOTALLY different.
<font face="Verdana, Arial" size="2">Originally posted by THATPRELUDEGUY: Is that a SS car? If not are you running any mods? It seems that most people pull those #'s stock and with a VAFC I'd think you'd see some higher numbers. </font>
I'm not understanding... How does that graph show that OBDII is detrimental?
Those are some nice gains in the midrange with the VAFC tuning, but isn't 4600rpm a little low? ~5200RPM is stock...
Also, JMCN, those are some NICE numbers for a bone-stock '97 SH
I will be doing some baseline runs on my bone-stock 2000 Base within the next 2 weeks hopefully... then I'll put all my mods on, and I'll do some more runs... Hee hee
Ok, first off the numbers are low because I had the 18" chrome rims on. I have Racing sport akimoto intake, DC CC header, Random technology cat, greddy PE exhaust, and Jun Ultra light flywheel. I have been driving for 5-6K miles before this run so the ECU has had time to do it's thing. The first time I went to the dyno it was with the intake and some custom crap Dynomax muffler. This new dyno shows that I have gained 17 foot lbs of torque at 3500 rpms and I had the factory wheels on my first dyno. This must say a lot for the flywheel since the other mods are for top end at the loss of low end. 20 gained at 4k and 7 at 4.5K. Now for the rest. Of the 50 dyno runs I watched. Most people lost 2-3 Hp on the second run I gained 1 (this is at peak). This shows an increase of 3-4 HP. Not much but how much did the mods help in the first place? Also @ no point does the second run fall below the first. Now to point out the part of the V-AFC. It is not tuned and the factory VTEC is not at 5200. If you believe that then you must only have the factory tach. This was a free dyno run and I just took my third one as a chance to lean it a little to see what would happen. I even put everything right back to 4800 and zero. They didn't have a Air/Fuel meter. I will get to the dyno soon, but not until I get my cam gears on. As for 4600 being to low. The dyno does not lie. I did gain power, so know it was not to soon.
<font face="Verdana, Arial" size="2">Originally posted by Ludakris_SH: ...the factory VTEC is not at 5200. If you believe that then you must only have the factory tach... </font>
I could have sworn that I saw other dyno results where there is a strong power surge @ 5200rpm, indicating an engage of VTEC. Correct me if I'm wrong.
<font face="Verdana, Arial" size="2">Originally posted by Ludakris_SH:
This shows an increase of 3-4 HP. Not much but how much did the mods help in the first place? [/b]</font>
Ok, so your first run is before you reset the ECU correct, then your second run is after, then your 3rd run you adjusted your vtec engagement point. How long after you were driving did the first run take place? And how long after the car was sitting did the second and third runs take place?
<font face="Verdana, Arial" size="2">Originally posted by Link: I could have sworn that I saw other dyno results where there is a strong power surge @ 5200rpm, indicating an engage of VTEC. Correct me if I'm wrong.
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its 4800rpms when flooring it through the whole gear..from a cruise and not flooring it to floor at like 90mph it might kick in at 5200rpms.
The car was setting in the show all day. Then I pulled it over to the dyno and let it warm up. So the second pull might have shown more gain if the car was heated up with a good hard drive first, but it still showed improvement. The time to each run is posted right on the dyno sheat. It took about a min to reset the ECU and clear the way.
I know this is going to come across bad but you might want to rethink your mods. I know you said you had some heavy 18's on the car but those numebrs are STOCK numbers. I'd be willing to bet more then a few people here have surpassed those numbers in their stock form. I don't know what your proof is that OBDII is affecting your performance but something is. If you switched to stock rims/tires and used a CAI instead of that under the hood you should be able to hit mid to high 170's if not 180.
yes I know the intake doesn't help it hurts, but it looks good at shows. I had better numbers on factory wheels with the intake and a custom 2.25" pipe and dynomax muffler. The wheels hurt it real bad. Also every dyno is a little different. Also unlike some others I make my pulls in 4th so the guy who did the 3rd gear pulls will show better numbers. As for checking my mods over. Don't worry about me. I'm starting to be sorry I showed everyone this dyno. I guess you can pic at if you want. I am in the process of ordering a custom Turbo kit. So if you have better stock numbers in a 3rd gear pull. Give me some time and bring it on. Also this is done in Florida and the ocean was about a football feild away. Humidity is a big power killer. I don't now how well the corrected numbers come out.
<font face="Verdana, Arial" size="2">Originally posted by Ludakris_SH: yes I know the intake doesn't help it hurts, but it looks good at shows. I had better numbers on factory wheels with the intake and a custom 2.25" pipe and dynomax muffler. The wheels hurt it real bad. Also every dyno is a little different. Also unlike some others I make my pulls in 4th so the guy who did the 3rd gear pulls will show better numbers. As for checking my mods over. Don't worry about me. I'm starting to be sorry I showed everyone this dyno. I guess you can pic at if you want. I am in the process of ordering a custom Turbo kit. So if you have better stock numbers in a 3rd gear pull. Give me some time and bring it on. Also this is done in Florida and the ocean was about a football feild away. Humidity is a big power killer. I don't now how well the corrected numbers come out. </font>
I know that humidity and heat play apart but I'm still not sure what your dyno PROVES about OBDII hurting mods. With a header, intake,and pulleys I pulled 170-172 hp over three runs. I'm CERTAIN my car had less then that stock so OBDII hasn't hurt my mods. I'm just trying to understand what your dyno runs prove about OBDII. Also on my dyno just after 5200 RPM's is where my torque jumps dramatically. I don't know about the rest of the 5th gen guys but I'm certain that's where my VTEC comes on.
I guess from looking at it the VTEC does hit before 5000RPM's but like you said on our factory tach it's almost perfectly at 5200. As for the cross-over I agree with you the dyno DOES NOT lie!
[This message has been edited by THATPRELUDEGUY (edited March 27, 2001).]
[This message has been edited by THATPRELUDEGUY (edited March 27, 2001).]
I don't get what you don't see. Most people lost power on the second run. The car gets hot and it's not really moving through the air. The little fan is not enough. I reset my ECU and gained power across the entire range. How does this not show that the mods were dialed out by the ECU? As for my low HP I guess my car just sucks. I'll deal with it. I'm glad your car is faster. Ask the guy I just killed in his base prelude what he thinks about my performance. We both had two people and I have a spare and a spare rim in my trunk. Plus my body kit adds weight and the 18's don't help. I have some other crap in it also. Plus the NSX brakes and legend calipers are heavier than stock. He had an intake and exhaust with factory rims and I after market wing. I left him and that is all there is to it. I guess here in FL we have ****ty dynos I don't know, but I thought this was the smarter board. I guess there are people every where that have there moments though. Tell me how would you test if the ECU hurts mods?
<font face="Verdana, Arial" size="2">Originally posted by Ludakris_SH: I don't get what you don't see. Most people lost power on the second run. </font>
MOST people....all I'm saying is that you gained a WHOPPING .6hp over your first run...just because OTHER people lost 2-3 does NOT mean you gained it by NOT losing it!
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The car gets hot and it's not really moving through the air. The little fan is not enough.</font>
Depends on the time between runs...5 minutes or 15 is a big difference no matter how little the fan does.
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<font face="Verdana, Arial" size="2"> I reset my ECU and gained power across the entire range. How does this not show that the mods were dialed out by the ECU?
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What's to say it was resetting the ECU? In all honesty couldn't it have been anything else? Maybe the outside temp drop 2 degrees, or the humidity came down a bit, for the difference that was made it doesn't look like any real proof to me. You think what you think and I think what I think that's all. If you were showing me a A/F graph showing how the A/F was corrected for before and after resetting the ECU that would be pretty solid evidence.
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As for my low HP I guess my car just sucks. I'll deal with it. I'm glad your car is faster. Ask the guy I just killed in his base prelude what he thinks about my performance. We both had two people and I have a spare and a spare rim in my trunk. Plus my body kit adds weight and the 18's don't help. I have some other crap in it also. Plus the NSX brakes and legend calipers are heavier than stock. He had an intake and exhaust with factory rims and I after market wing. I left him and that is all there is to it. I guess here in FL we have ****ty dynos I don't know, but I thought this was the smarter board. I guess there are people every where that have there moments though. Tell me how would you test if the ECU hurts mods?
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And what does that have to do with anything I've said? This is the "dumber" board for asking questions? I could care less how fast your car is I'm just pointing out that your PROOF is more speculation then proof and there are some newbies that will take your word just because you SAY it's proof.
Ok then why don't you go prove it. The time of each run is on the dyno and no the temp didn't change. No clouds in the sky. The car was sitting for 15 sec off while I reset the ECU. I took less time to get to my second than most of the cars that went on the dyno those two days. I watched several cars run like 50 of them. I even watched a 5th gen have lower numbers on the second run before my car got to the dyno. I guess I should have reset his ECU also.
How would changing the ECU help? If you change the ECU on a modded car and you get gains then that ECU could be better programed. The only way that would work is to do a dyno run of the car at first. Then you would have to install the mods and do another run. Then you would have to drive the car around so the ECU could addapt. Then you dyno again to see if you lose anything. If you just swap the ECU you don't know anything other than the new ECU works better or worse on the car. As for me gaining .6HP How much do the mods help in the first place. It's not like you get 5HP for a header. Well we will never know because nobody here goes to a dyno often enough to try a before and after run. Oh by the way I'm just blowing smoke up your skirts. My entire reason to come here and post this was to make you believe something that doesn't happen. I normally don't care, but this time go prove me wrong or shut your trap.
