Gernby

[QUOTE=Hirevs2k,Jan 14 2011, 08:18 AM] i don't have any dyno plots or anything coz it's not worth showing or braggin. anyhow, i used to have a 2.5" bluddy club spec III exhaust and it is weaker than my new set up which is greddy 70mm ti-c. granted, the peak whp wasn't much of a gain but the fact was, i didn't lose any hp over 2.5" exhaust. and in fact, i gained a shit ton of midrange whp.

Gernby

Thanks. I'm not trying to please everyone, and it's certainly not uncommon for me to be one of the guys "hating" in threads ...

I just wish I wouldn't have picked such a "hot bed" topic as my first "test results" thread. This 70mm exhaust test represents probably 10% of the results that I've put together over the last 6 weeks. I have so much test data to share that I really don't know how to organize it all. However, after all the bullshit in this thread, I really just don't feel all that motivated to share it.

punchdrunk

All you have proven is that a 70mm exhaust wouldn't benefit you and your set up.

The inference from your topic title is that 70mm exhaust wouldn't benefit any set up and you are showing arrogance by ignoring all the other data that disprove your theory. You are right, everybody else is wrong - or that is what you appear to believe in.

I have dyno proof that showed identical results to that posted by dan_uk above. I sold my VAFC2 because my 70mm header back exhaust leaned out the AFR to render the device useless. This is proof enough for me, but your tests are more conclusive apparently.

I'm not sure what you're really trying to prove because the likes of Spoon, ASM, TIR, HKS - all with considerably more expertise and resources than you - have proven that 70mm exhausts make power.

Anyway, carry on as it looks like you're having fun arguing with yourself. I'm not sure those in the know are taking your findings seriously.

Gernby

[PISSED OFF]It must be nice to live in ignorance. I don't think I said ANYWHERE that a 70 mm wouldn't benefit any setup. IIRC, I said that it won't benefit a well tuned NA AP2. It seems to me that you had a poorly tuned NA AP1 that you decided to make an UNtuned NA AP1. I'm certainly not going to throw science out the window for YOUR results!

I find it laughable that you guys are criticizing me for simply defending my own data. I've put easily 60 hours into this test. Do you think I did this just to argue with you phuckwholes? I find it even more laughable that you would put more stock in test results from "the likes of Spoon, ASM, TIR, HKS", who PROFIT off of their tests! They would NEVER, EVER publish results like these! If you would sleep better at night to see some bullshit plots, I can whip some up in 10 minutes! Of course, you guys would have LOVED to see those BS plots if they reinforced what you already believed.[/PISSED OFF]

suzuka-blue-s2k

Gernby, thank you very much for doing these tests for us. I appreciate you taking the time to do all of this testing, installing and removing a parts, and showing us your results.

bpaspi

+1

crazysupratt

The soft dyno is the one that you have posted on that thread. It does have SAE correction and it was enabled. I tried to do the same thing you did. I went out before installing the exhaust, did 2 runs and logged it. Then I went home, installed the exhaust which took like an hour. So the weather might have dropped a degree here and there. Went back to the same road and re-ran the 2 run. The only thing I didn't do is have the exact amount of gas but it shouldn't be that much gas that I wasted. I might have done some little adjustment to A/F.


Anyways, I know you are very through in your research and you're doing it for yourself and not to prove anything. These results is what it is, data. Its up to people to use it in a constructive way or not. You are just giving people more information to make their choice. I hope the other people don't deter you from not sharing your results as I and others would like to see them whether its good or bad.

Squirtle

Gernby - great results. Love the thread and what I am gaining from it.

Would you recommend running a 60mm test pipe on an un-tuned 06+ DBW vehicle? I'm a bit worried that the differences made from the pipe would cause damage to the motor (running lean/rich) if not properly tuned. If you want to PM me instead of clutter the thread I'd appreciate it.

Again, thanks for the data - it was a good read and provided very useful to me.

Gernby

I decided that since I had so much invested in this test already that it would be worth it to go ahead, and take it back to the dyno where we had the S2000 dyno day last month. The shop owner was able to put my car right on the dyno as soon as I got there, so I don't think heat soak was much of an issue. We did 3 pulls, then when he was almost done unstrapping the car, I realized that I FORGOT to hit the datalog button on the FlashPro! Being a really good guy, the owner said that he wouldn't mind strapping it back down to repeat the 3 runs.

I expected the results to be a bit higher than last time, since it didn't have much time to heat soak. However, they were LOWER (due to the small gasket!) than they were last month! I didn't have a flash drive with me, so the owner is going to email the dynorun files to me. However, here are the peak numbers from last month (with the 60mm test pipe and modified stock exhaust) and today (with the 70mm test pipe and 70mm single).

Last month

4th gear - Peak HP = 223.23 Peak TQ = 157.16
5th gear - Peak HP = 223.48 Peak TQ = 159.13
5th gear - Peak HP = 224.69 Peak TQ = 160.57

Today

4th gear - Peak HP = 219.77 Peak TQ = 154.60
4th gear - Peak HP = 220.58 Peak TQ = 155.26
4th gear - Peak HP = 221.25 Peak TQ = 155.51
- 15 minute "break"
4th gear - Peak HP = 218.33 Peak TQ = 153.67
4th gear - Peak HP = 219.18 Peak TQ = 154.62
4th gear - Peak HP = 220.30 Peak TQ = 154.50

The difference in the car that I believe could have impacted the results in some way are:
1) Different rear tires. Last month I had 265/35-18 on the rear, but today I had 285/30-18.
2) Slightly leaner mixture. It was in the 12.5 range last month and 13 range today with the dyno's wideband in the tailpipe. We ran the 6th run without the wideband sensor, since I was concerned it was blocking the flow of the single exhaust.
3) Weather conditions were almost exactly the same and there was only 0.01 difference in the SAE correction factor.
4) We didn't do any pulls in 5th gear today, so maybe that might have contributed to the slightly lower numbers. However, none of our pulls were better than the one 4th gear pull we did last month either.
5) Small friggin gasket!

I'll post graphs when I get the files from the shop.

BTW, it looks like I'll have a new 70mm Berk Test Pipe to test soon too!!!

Gernby

These are available in 720P if yoiu click the button.

Modified stock exhaust with 60mm test pipe
[media]http://www.youtube.com/watch?v=gUjXNGX245E [/media]

70mm single with 70mm Berk test pipe
[media]http://www.youtube.com/watch?v=C5R5u_mJ_Vc [/media]