Im befuddled

 

Ok, so maf air temp 37deg(before intercooler) intake manifold air temp 35deg(after intercooler), thats a 2deg drop.

 

I agree here, for sure i was pretty happy to see you setup this thread. However i have few questions to ask. I must admid that it was impossible to read through the whole thread so this might have been asked already:

As you didn't really specify what kind of ebay cooler you actually got it is really hard to put these measurements into place. So what type of IC was it, whats the inner structure, what were the actual dimensions ect.

This is because some testing has been done on the subject also here and the results were pretty much opposite. (heres the test done by vigge)

http://www.stcf.net/viggen/kiina_stressi.pdf

These are results vigge got from his car when running a cheapo IC, as you can see the black graph is the air temp (in Celcius) going into the IC and the red graph is the temp coming out. The percentage in the bottom is the efficiency of the device.
530x300x76mm so 3" thick nameless IC made in china with Bar&Plate setup.

These are actual consecutive pulls on a highway going through the third gear so you can see that its not just soaking the heat but also transfering it to surrounding airflow.

With this data and the car running on same hp range, it is really hard to see why 600$ more expensive IC could be better ( surely it cannot do over 100% efficiency)

br,
Lekonna

 

But that doesnt take into account the heat added by compression with the turbo

 

I hate to bring this thread back up but I read al 25 pages and nowhere did I see a comparison between the ebay intercooler and stock evo 9 intercooler. I would like to know which is better for an evo 9 trying to make 360 whp with stock turbo, stock cams on 93 oct with lots of bolt ons.
which is better stocker IC or Ebay IC? Thanks in advance

 

It is good to measure the delta across the core alone, but from what I remember you are doing well to see post IC temps ~20F above ambient. However, in this case it is probably representative of both core efficiency and compressor efficiency.

 

So what your trying to say is that the stock evo 9 IC is better than a 3.5" ebay IC??

 

If everyone could make good power with a EBAY core don't you think they would all be using it like the Megan O2?

 

Dont buy that Ebay Junk. Spend the money and buy the real deal. Make sure it is a Garret core. That Ebay junk is just a giant heat sink that lets air pass through. I'd take the stocker any day. Mitsu Engineers Vs. Ebay, are you SERIOUS?

 

Agreed. Stock IC works great on stock turbo. If you want to upgrade, pony up the cash for a Garrett 3.8" core fmic.

 

you guys are all right who am i kidding with my last question. im going to go back to my stocker, sell that other pos and save for either a buschur or ETS one. thanks for the reassurance

 

I have no idea what core is better, but I would suspect the Ebay to be better than stock.

Without turning this into an all out science project to reasonably measure difference in core efficiency you should do a few things:
- measure delta (pressure/temp) across the core
- measure ambient temps for reference
- you should probably do a set number of long and sustained runs so you can heat soak the core prior to taking measurements.
- dyno fans can only simulate ~10-12mph worth of flow so data should be collected on the street at speed

It is not as easy as it seems trying to compare cores. I try to look at efficiency numbers provided by the manufacturer as well as flow numbers as a function of pressure drop.

 

Your right it isnt as easy as it seems. The reason why im in here asking for help is because of this: https://www.evolutionm.net/forums/ev...ics-video.html <-------- thats my thread check it out and see if you can input some of your good knowledge to try to help me out. Anyways thanks for the info Im gonna figure a way to test the above things mentioned

 

IF we go based off restricted flow the Ebay would be better than stock. The stock intercooler will not flow enough cfm to support more than 388-393whp (funny I can be that specific). I pushed a 3076 on racegas one time and going from 28psi to 36psi I picked up 20whp on a stock intercooler.

From the standpoint of the actual efficiency of the core, the Ebay does not win. Most of them wont even heatsoak they flow so freely the hot air goes right through. Not enough thermal mass (fin count) to pull the heat out.

If you were on a fuel that doesnt knock (E85) you would make more power on the Ebay simply because it would flow more, not that it is actually better.

 

wow thanks for the write up this makes a lot more sense now. so based on having a stock turbo, stock block, stock cams with lots of bolt ons on a 93oct tune my better choice for efficiency and making more power would be the stocker IC rather than the ebay IC. correct? sorry just want to make sure i got this right