Downpipe differences

[jtlctr]

“I sat in an unmarked car and staked out a house for 10 hours to buy this downpipe, sure why not.”

Ideally an unmarked FL5!

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[Tougefl5]

https://www.civicxi.com/forum/threads/mrt-resonator-delete.56098/

Lazy isn't the right word lol

 

[Nikw91]

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https://www.civicxi.com/forum/threads/mrt-resonator-delete.56098/

Lazy isn't the right word lol

Changed my mind on wanting to install it.

 

[AspecR]

i already ordered hondata and just hit up jester. He’s about 2 hours away.

I wish, there is only one E85 gas station and its 20-25 mins across town. So I don’t want to deal with that lol

if there is a decent amount of GOOD noise and hp gains then a foot chase could be worth the DP. Lol

If there's enough work to be done, he'll come down to Fort Lauderdale. I'm working on getting a couple people in line. We still need to do a dyno tune on my car for shits and giggles

 

[Nikw91]

If there's enough work to be done, he'll come down to Fort Lauderdale. I'm working on getting a couple people in line. We still need to do a dyno tune on my car for shits and giggles

I have another guy in Stuart that wants a tune from him too

 

[jtlctr]

https://www.civicxi.com/forum/threads/mrt-resonator-delete.56098/

Lazy isn't the right word lol

Why do you say that? I did the resonator delete on my car and it was a royal pain in the ass not having a lift to use. Not sure if it was worth it in the end.

 

[menikmati]

This, this, this. As I mentioned on Page 2, if you're looking for value and to maximize power, I would skip the dp. Flashpro + CANFlex + tune = all the power you will need for a street car. And at less than $2,000 to boot if you're enterprising.

Damn we're talking almost Spoon titanium strut bar monies right there.

 

[BigBird]

I think the hierarchy is basically

1. Tune gets you to 360-370hp (just talking in terms drobs dyno here since he shares a ton of data with us on IG)
2. Intake/Downpipe seems to be worth maybe 10hp, there are a lot of cars getting to ~380hp with these two mods, a little bit less if they're missing one.
3. Intercooler I don't think it necessarily increases the maximum power, but will absolutely maintain power way longer than the stock intercooler. Tube and fin intercoolers (HKS, RV6, etc.) are lighter and may be better for cars making more horsepower with upgraded turbos and pushing them for extended durations like on a track. Bar and plate ICs (PRL) are heavy but do a good job maintaining intake temps and are pretty cost-effective and durable.
4. ...
5. ...
6. Turbo inlet pipe just looks cool but does absolutely nothing, I asked drob about it in the comments on one post and he said it's just for looks.

Once you have the first three, to make much more power, you need basically any of the three in various combinations to reach a given power level:

• run an ethanol blend
• upgrade your turbo
• and/or upgrade your fuel system.

Ethanol blend can get the stock turbo to roughly 400-410hp, upgraded turbo (27won Kuro) on 93oct maxed out stock fuel system on a good day is 425hp, and Kuro + fuel system + ethanol is good for 460-480hp on a Kuro.

Also interesting looking back through drob's posts in that there were some catless downpipes making practically negligible extra power. Some made a little more torque but with all the downsides of being catless, it doesn't seem worth it over a good DP like the TSP one.

Good summary as this seems right.

Stock fuel system is a big limiting factor for most turbo upgrades.

Here's a Kuro+ 'only' making 440/394 on 93 pump with upgraded HPFP, but stock fuel injectors and LPFP.

 

[Nikw91]

I few people say that downpipe brands don’t matter and “gains are minimal, maybe 3hp from brand to brand.”

Here is a comparison of two FL5s on the same dyno, same tuner and almost identical mods other then one with the Innovatiq catless downpipe and the other with the 400 cell TSP downpipe.

An abundance of dyno graphs have showed otherwise.

 

[D-RobIMW]

Correlation is not causation.

I've tuned a bazillion of these things, and I can tell you with a high level of confidence that the difference between most catted vs catless downpipes is so minimal, it's not even funny. The bigger factor on your comparison is how far we were able to go before running into the knock limit of the particular engine and fuel quality.

 

[Cueyo]

Correlation is not causation.

I've tuned a bazillion of these things, and I can tell you with a high level of confidence that the difference between most catted vs catless downpipes is so minimal, it's not even funny. The bigger factor on your comparison is how far we were able to go before running into the knock limit of the particular engine and fuel quality.

Have you ever quantified downpipe data graphically? Or even just specific mods data? Would be super cool to see average power gains across identical setups, I'm sure they would be a far better gauge for this thread.

Like what's the most common mod you've seen, or what's the average power gain for a bone stock fl5 versus de5

 

[BigBird]

pretty sure DE5 and FL5 end up the same after tuning

 

[Cueyo]

pretty sure DE5 and FL5 end up the same after tuning

I'm more so asking to see if theres a "binned chip" equivalent for the C1. Technically they're identical afaik, but there's also variation, and that variation could point to differences in which engines go in which car (de5 or fl5), or not at all lol

 

[Nikw91]

Correlation is not causation.

I've tuned a bazillion of these things, and I can tell you with a high level of confidence that the difference between most catted vs catless downpipes is so minimal, it's not even funny. The bigger factor on your comparison is how far we were able to go before running into the knock limit of the particular engine and fuel quality.

First off, I love and respect you posting your dyno graphs! It’s helping me with my build.

Like Cueyo said, can you quantify some of your data on a graph?

Because I have noticed after looking at roughly 100 of your posts, that some downpipes seem to make a noticeable amount more hp/tq across the whole graph then others almost every time.

I know you work with Two Step Performance which is a great company with a great Downpipe that you support.

I, along with others would love and appreciate some hard data that shows that all downpipes are similar. Because 20hp/tq is a little more then minimal I think most would agree.

IF you don’t mind and have time.

 

[Two Step Performance]

First off, I love and respect you posting your dyno graphs! It’s helping me with my build.

Like Cueyo said, can you quantify some of your data on a graph?

Because I have noticed after looking at roughly 100 of your posts, that some downpipes seem to make a noticeable amount more hp/tq across the whole graph then others almost every time.

I know you work with Two Step Performance which is a great company with a great Downpipe that you support.

I, along with others would love and appreciate some hard data that shows that all downpipes are similar. Because 20hp/tq is a little more then minimal I think most would agree.

IF you don’t mind and have time.

Not to be rude but Derek has essentially already answered by saying the cars are typically limited by fuel quality (and not exhaust flow). There are a TON of variables in play here. Comparing different cars using different fuel ends up being an apples to oranges comparison.

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