So I installed a new midpipe today, and I figured I'd get a few logs in before and after the change using my AccessPort.

Some interesting results.. lol. Maybe this thread can become a record of what difference individual mods actually make. I'd love to compare notes with others.

Methodology:
- Using an AccessPort, log all data streams in a few 2nd-gear pulls before installation of new part
- Install part
- Pull the battery to reset learned data
- Drive around to let the ECU relearn
- log a few more pulls on the exact same road in exact same conditions as before
- format and analyze logs using Virtual Dyno.

Actual numbers don't matter this is only about the delta between before and after.

------------------------------------------------------------------------------

Patient #1

Green and Yellow = Stock cat in good condition
Red and Blue = Corksport cat+resonator midpipe


[edit] forgot to factor in the full tank of gas I added between the before and after. Hence the mass change of 90lbs
Hooray, I've lost a statistically insignificant amount of power! To be honest, this is surprising, my butt-dyno felt an improvement. Silly butt-dyno.


I'll retry this again in a few days, but pretty skeptical at this point :/

Whenever I have time I'd like to try these:
Patient 2: MM final tune vs. Stock
Patient 3: old sparkplugs vs. new (it's time soon)
Patient 4: Racing Beat intake vs. Stock

 

On the same subject, wanted to share this.

In June I ran at Mont-Tremblant with the stock water pump and thermostat. My temperatures at the end of a session were between 210 and 220, peaking to 225 at one point (recorded in AccessPort). 225 is overheat risk territory by my count.

Today I ran at the same track in comparable weather, but having installed the RE-medy water pump and 170F thermostat. The maximum temperature across 4 sessions (25-30 minutes each) went as follows:

189 (morning)
192 (morning)
198 (lunchtime)
205 (late afternoon)

So, for anyone looking for actual real-world results of the water pump and themorstat mods, here tis.

Before: 210-220 peaking to 225
After: 190-200 peaking to 205.

Everything else as far as cooling is stock/original from 2004.

 

Without also recording ambient temp, track temp, humidity, dew point, and other general weather comparison data conditions between the two days your post is about as unscientific and meaningless as a technical comparison comes.

 

So, let me quantify 'comparable weather'. Of those variables, the only factor that affects cooling performance on a scale that matters is ambient temp, which is different, on average, by 6F between the two days, the 'before' being hotter, hence "comparable weather". IOSR papers discount dew point, humidity and pressure as individual variables and instead consider the specific heat capacity of air, which is a function of all those. The variability of specific heat for the purposes of cooling, rather than engine tuning, within the range of weather we see, is neglibile.

As far as the ambient temp difference, it alone does not explain the coolant temp observed even if engine temp rose 1:1 with ambient, and that's not the case, so while part of the delta can be attributed, not all of it can.

Now, the way I see it, you can complain about it, or you can help, so I'd like a mod to delete your post and mine, and let's start over where you take the time to do your own testing and post your results, and we can compare. Deal?

 

With virtual dyno i have noticed when starting WOT from for ex 2000rpm give a higher result then starting from 3000rpm, this also happens in your logs, try to do wot at the same rpm everytime and use the exact same road and starting point of it.
You should also put in your AFR, you can do this by using the header in the log and put it in the options menu at custom name AFR.
Your LTFT at WOT is probly very different now also after resetting the ecu, did you compare them?

 

Interesting, I'll check the starting rpm (maybe redo the test) and check LTFT. Both sets of logs log all variables, so should be able to confirm. In fact that means we also have IAT, so can factor that in as well.

 

Might I suggest a minimum of 3 pulls per condition such that standard deviation (and therefore other statistical methodologies) can be applied? Just a thought - overall I think the approach is relatively sound (or as close as one can reasonably achieve).

 

Absolutely, will do for future tests. Actually I'd love to see more people do their own tests. Just want to have a measure of how useful mods are. I can't test all of them but many people have an AP to do the same type of testing. At that point we can reach statistical significance across many result sets.

Don't want to buy mods that do nothing, right?