aznbo187

iTrader: (1)

That is correct.

Here are the dyno graphs for the Mid-pipe and exhaust on the RDX.

Excuse the quality of the pictures, the dyno place printed and scanned them.

Before. Stock exhaust. CPE Intake.
193WTQ & 174 WHP


After. ATLP Mid-Pipe (no cat) + ATLP exhaust. CPE Intake.
205WTQ & 185WHP


Each session consisted of 4 pulls. 30 minute cool down period prior to each run. They were all done in 3rd gear, sport shift on a 4-WD dyno that is fully enclosed. The RDX would stop accelerating at a little over 6000 rpm on the dyno so it was no use to keep on pushing it because the power would plateau anyway.




Gains were 17WTQ and 12WHP.

Were still waiting on a few things before we can finalize the cost of the system, as well as the primary down-pipe to arrive so that we can tinker with it.

wspy

So for those of us that want the entire turbo back setup, would it suit us to wait for the primary down-pipe to be developed, or will it BOLT UP to the current available system ?

sasair

The dynos you posted show 17WHP gain (179 to 196) and 12 WTQ gains (193 to 205).

aznbo187

iTrader: (1)

Oops. Can you swap it for me. I knew i should have waited until after 4 AM. =)

This will bolt up to the existing factory system.

pinnaclecustoms

I think those are really good results, especially for a 2.5" exhaust that is not blistering loud. They seem to be very real world, not overinflated dyno sheets. Good Job Guys. Really looking forward to the possible down pipe.

Chris

Azzie

Looks great, sounds good and even gives some benefit, but I wonder what results could be WITHOUT the CP-E intake. Could it change the chart or affect the a/f ratio?

Then sorry for the possibly lame question, but different dynos give different figures. Almost stock RDX gives 193WTQ & 174 WHP. Not embarassing, but maybe we should only compare but not pay attention to exact numbers?

aznbo187

iTrader: (1)

A dyno is only as good as it's constants. There is no way of accurately comparing two different dyno's, cars, especially at two different locations. Because we are measuring the improvement of power gain, you want to keep the subject and it's variables controlled and constant, so that way the only thing you are changing is, in this case, the exhaust.

Azzie

Thanks for the prompt reply. Good gain, as I said before, but I think this gain is from catless midpipe and not from the CAI or the catback. I'll repeat my Q's. What results could be WITHOUT the CP-E intake. Could it change the chart or affect the a/f ratio?

bobin

I am also interested in all this work that has been to the exhaust system of this RDX. I would like to have a system installed in my RDX, BUT i am not a young 20 year old anymore, YES i would like it to be QUITE close to stock or a little louder might be ok, BUT do not want the noise in the cabin area at all. Hope a system can be made for the people that want it QUITE.!!!!! And who will do all the installing of this total system.

aznbo187

iTrader: (1)

Without the CP-E intake, could it change the a/f ratio? Perhaps.
Could it change the chart? Yes, it would be a lower baseline as well as a lower post dyno. But on our runs, we haven't changed anything besides the exhaust. The dyno's were to show the gains simply for the exhaust and mid-pipe gains.

The gains were a combination of the mid-pipe and the exhaust system, not the mid-pipe alone. By increasing the pipe diameter, and also getting rid of a lot of bottle necked areas, the RDX is able to flow more air.

Interior drone and noise is not significant at all, and very minor compared to the aftermarket intake on this car. On the exterior though, you can definitely notice an improvement, but it's not a rice rocket sound by any means.

Azzie

As far as I could understand the ATLP is now working around the downpipe and is going to release the whole turbo-back exhaust.

When this should happen?

Do you plan dynos with the whole system installed (w/o CAI would be preferrable)?

What about the price?

Is there an idea of a collaboration with Hondata to optimize their reflash for the changed AFR ?

Thanks.

aznbo187

iTrader: (1)

We are waiting for the primary DP to arrive from the dealer, and then we can finalize some options so it will work with most people on here.

Our design will revolve closely with the member who had already created a custom DP, but it will be able to work with the stock setup, or the ATLP exhaust system. Gains should be very similar, if not within a few HP/TQ.

We did contact Hondata, but as far as their adjustment on the programming has not been discussed. My impression is that if they see that enough people are willing to upgrade their performance on this car, (i.e. intake, dp, exhaust), they will realize that a lot of their users will prefer a more optimized setup to those changes.

Time frame and pricing will be determined when the primary down pipe comes in, and I'll try to keep you guys as updated as possible.

Azzie

Thanks for the prompt replies. Waiting eagerly for the updated results and prices. I hope that Your marketing policy will allow selling by items (not the whole system).

PS: Pang created new downpipe that also fits the stock.

MMike1981

seeming that the DP is the most significant piece of this puzzle, I would hope that this item would sell as an individual part/piece and not just as a bundle to the package.

Azzie

I do also hope so, but don't forget about the midpipe. Both of this parts give performance because cats are deleted. To me the muffler upgrade is just for aesthetics purposes

And even better results may be achieved in case Hondata will make an optimized reflash as they did to the Church Automotive.

john50

Can you give a ball park price (+/- $100) for the at least the midpipe back?

I'm working with a local shop that does a lot of custom exhaust work, but is sophisticated enough to have his own 4-wheel dyno.

john50

I forgot to mention, he's working up his quote right now.

He's not a fly-by-night or new start up. He's been in the business since 89 and has a good reputation with a number of sources I trust.

BigHatch

I'm sold on the turbo back exhaust. That downpipe would really do the trick.

wspy

I wonder if they got in the DP yet and if the fab has started

Maaan .... are'nt we impatient

mzhao84

AZNBO187!! any updates???

DanRDX

Yea any updates on the DP

mzhao84

Wow.. 13 days and not a single reply or update... I wonder whether or not they're making the more agressive exhaust during these days or not... hmmm..

SinCity

14 now

mzhao84

ZzZzzzZ.. Where areeeee the updatesssss?

aznbo187

iTrader: (1)

Apparently their still waiting for the cat to come in. We're just finishing up the TL exhausts so all our focus has been on that the last few days with the manufacturer being sick. We will be back on track and I'll try to find out when we can start on the primary down pipe.

mzhao84

PHEW... thought you forgot about the RDX crew man.

We shall sit tight on our butts and WAIT!

wspy

It sure is taking a long time to even get the darn cat to start the project!!

Anyways, we all wait!

SinCity

Azn: Do you have any pics with the vehicle on the ground looking towards the back end. I do have some concern of how much the muffler under-hangs. I am not a fan of seeing the muffler(s) from the back. I guess a little will be neccessary in this case?

wspy

Did you see these?

john50

AZNBO,

It looks like you've gone with a single muffler. I've heard that one company did quite a lot of work with a dual muffler system for the RDX. Did you consider this design while developing your system.

If so, what were the advantages? And just as importantly, what were the disadvantages?

SinCity

I'd like to see the last one from ground level. It appears that all pics are taken from below bumper level.

BigHatch

Prefacing this, I'd be completely satisfied with the dual output as shown.... I know that costs will determine what is put out, but i was wondering if there are any considerations towards other designs. I've seen that Mugen makes a nice dual center exit for the JDM CR-V.

When i first traded in my 06 STi for my wife's 2007 RDX (sob...sob......get off my back, we needed more room for the kids football equip... ) I remember thinking, "Hell, I'd totally go for a single, straight through, flame belching, turbo whizzing, exhaust; but with this car, all out performance can take a back seat... better performance will do . I'll take a nicely fabricated center or dual exit (i.e. HKS's CTi HiPower MKII MR2 turbo).

I'm curious, does anyone know if the Mugen center exit CR-V would work with the RDX factory rear diffuser? I think Mugen uses their own diffuser, and I bet the ID isn't adequate, since it's designed for a N/A engine.

Regarding this new DP being fabricated by ATLP... do we have any features noted? Will the bellmout be cast SS? How about some Ni-resist???

I just put my DP back on my 02 WRX wagon (bugeyes rule!!!) after needing my first smog out here in CA....it's pretty much convinced me that I need to straightpipe the BigHatch....

Until you do this to a turbocharged car....you have no idea what a difference it can make...

...and yes, it's not an SUV....look at the car's profile....same as a Toyota Matrix @ 120%....hate it or love it....It's a BigHatch....

john50

It's been almost two weeks since an update. CP-E seems to be getting closer.

preacher

Mike, pm sent..

aznbo187

iTrader: (1)

Small change in muffler design. We'll be using a different muffler, something very similar to the ATLP Quad exhaust for the TL. It will provide a bit deeper tone and will still be subtle enough for daily driving! Please, please hold on we are STILL working on this!

Jon, I also got the PM. Thanks, I will keep it in mind. =)

SinCity

Interesting.....deeper tone. Just no drone, please.

wspy

Yeah ... NO DRONE!!!!!!!

john50

We're coming up on three weeks since the last update. Can you give us some news?

mzhao84

wooo... quad exhaust?? like the TL-S??? yummmmyyyy

aznbo187

iTrader: (1)

No quads.

They just finished the revised muffler today, and we have dropped it off at Import Tuner for their test vehicle. Their going to do some tests along with their RDX and Hondata, as well as K&N. Their dyno day is scheduled for this week, so I will try to get a few snap shots.

If everything goes right, we should be starting production of these systems by mid-next week.

There is a light at the end of the tunnel. =)