Ok, pics are back

 

Looks like the ATLP V2 is the way to go. I've said that all along..

 

Also, in the first dyno graph (ATLP V2 vs XLR8 V2 vs RV6 V3) there's an advantage to the ATLP V2 j-pipe over our XLR8 V2 j-pipe but in the third dyno graph there isn't. So the data is conflicting. How can on one dyno it make more but the same products on another dyno look the same?

Also, which j-pipe was dynoed first? Obviously heat soak would play a factor for the last j-pipe to be tested.

Marcus, obviously you spent a significant amount of money to do these tests and I applaud you. However, I'd be interested to see what differences there actually are on a naturally aspirated TL with bolt ons. Also I'd be interested to see the differences when conducted by a neutral party.

In time we're going to be bringing a dyno in house so we can do more tests like this but after purchasing a Hunter alignment rack and tire machines at SEMA my budget and spacer is restricted.

 

3rd dyno is of xlr8 v2 and the new ATLP v2-r not the Atlp V2

 

Thanks for the feedback...as mentioned above the 3rd chart does not have the V2 in it. It shows the V2-R compared to XLR8 V2. It also shows the V2-R with a 3" mid-pipe.

Heat soak was not an issue. Truth be told, we expected the XLR8 pipe to do better, and actually let is rest longer than the others to make sure that the results were consistent and representative of the part. The results were the same running it with a 5 minute rest or a 10 minute rest. This test took all day. The car had a lot of time to cool off between part changes, at least 15-20 minutes plus the time after our couple warm-up pulls. Heat soak, in all seriousness, was not an issue.

If you question how your pipe did, you weren't the only one. It was as much a surprise to us to see the ATLP V2 do as well as it did as it was to see the V2-R not do as well as we expected. C'est la vie. Ultimately, Heeltoe represents ALL these parts and seeks to do these tests only to help further our knowledge of the parts and how to recommend parts to specific people asking about them. The intention here is not to degrade any pipe.

That said, we we have to put this out there: If information comes out that is significantly different that what we have done, we would have questions as to how the test was performed and the credibility of its results. We know we did a good job here and had plenty of witnesses.

We did some NA runs a while back and looked back at them. The power-band is hardly different if either boosted or not boosted. Yes there are more numerical gains with a boosted car. But these tests are not claiming any sort of power-gain or power change numerically. If a suprcharged car makes more power than the next we expect that the tuning has a lot more to do with that than which j-pipe was used.

We wanted to see how these parts compare to one another in a real back to back test. Boosted, non boosted, AT, MT...much of that really doesn't make a huge difference. Is one ideal for product development? Sure. But we already developed our product (we don't tell you everything we've done) and just needed to compare them. The truth is that these j-pipes all work well but do so in different areas. The test highlights the strengths of each pipe. We already knew the ATLP was the horsepower leader and the RV6 gave up upper RPM power for lower RPM power. The boosted car just made this more obvious.

If you are looking for any more information than that from a comparison test such as this, you are probably reading too deep into the numbers. Doing this test all over again with a non-boosted car is probably not going to be nearly as interesting as anyone thinks.

 

^ While that may be true, I think the majority of TL owners who choose to mod their car will decide to get either PCDs or HFPCs at some point in time. There is absolutely NO data comparing Jpipes on a car with HFPCs or PCDs. Being that the TL is this far in the game, I'm sure I'm not the only one surprised at this. I'm not pointing any fingers whatsoever, I'm just saying that there is a lack of information that is essential to *most* TL owners who mod their car. Hopefully at some point, there will be a test that conveys the differences of each Jpipe on an All Motor car with PCDs or HFPCs.

With that said, I am following Evans Tuning on Instagram and all I can say is, the future for the J is very promising. According to their Website, they are focusing primarily on the J series from this point forward. They have already gone 10.17 with their All Motor J car in such a short period of time, I can't wait to see them go mid 9s with more time.

 

Message me information on where i can read that please?

 

Sonnick, I can appreciate where you are coming from.

If we could easily obtain cars outfitted just the way we wanted them to be with users who are able and willing to participate we would. Please don't take it as an insult or our ignorance that we didn't have a car with PCDs. It can take months to find a car to test on, and sometimes we have to take what we can get.

We run test anyway because it frankly won't change the graphs enough to stress about it. PCDs are not going to change the tune or the powerband of the car; just shift the graphs up a bit because of the higher flow. Also many people do keep the stock cats in place. I can promise if we tested with PCDs we'd have people asking for graphs with stock cats. Testing with the stock cats is more valuable because at least we know that the stock cats being in place don't numb the impact of changing the j-pipes.

Flow itself is not what changes these graphs. The location of the merge does. The design of the tube length does. The size of the cat-back section does. Deleting the Primary converters will gain power...but I am willing to put money down that if we did the test again on the same car with PCDs in, and erased the scales on the side of the graph, it would be pretty tough to tell the difference based on the shape of the graph alone.

 

Lol, i love ATLP don't get me wrong, but PCDS and any exhaust work will change the powerband. Back pressure does effect power band. Since we have three different options stock cat, hfc, pcds we have three ways the graph WILL change.

 

No offense taken, Marcus; I hope you didn't take offense to my comment. And I understand it's difficult to find cars to test on. This was a great test for all purposes.

 

FYI my car had Pcds during the dyno test.

I was there the whole day watching.

Atlp v2 shorty jpipe made the most power.

For heat soak, there was none as I stated in my supercharger thread. I told you so! But if you think rv6 or xlr8 jpipes were tested last, it was the atlp v2 with 3 inch mid pipes, second to last was v2r jpipe.

Marcus you did enough testing with the jpipes. Who cares what they think if numbers are amped up on a boosted car. No need to test anymore.

 

It's nice to know what the average guy can expect. if they are all within 3-4whp of each other than it really doesn't matter who you go with. You aren't going to feel or see the difference.

 

My bad, I though you had put stock ones back on for a smog test.