Austin

This one seems to be quite interesting, the car was tuned to run with the Carsound cat, which is the 54006 model commonly known as the A.Teo cat, which this one happens to be. The test pipe was a Comptech "cat-drop out" (just a fancy name for a test pipe), I believe that it is has 2 1/4" piping, the cat-back is the Comptech 2 1/4" system...I'm sure that everyone is familiar with my setup after all of my other posts, if not there is a link to it in my signature.

All that I can say is interesting results...
Austin



<u>Here are the two plots broken down into spreadsheet format.</u>

Cat installed.


Test pipe installed.




[Modified by Austin, 3:48 PM 8/24/2001]

nsx-Animal

Look pretty close to me..

Big Phat R

If you're using the Hytech header why did you test a 2 1/4" test pipe and cat??

The output of the Hytech is 2.5" no? So then your 2 1/4" flange at the front of the cat/test pipe is your rate limiting bottleneck and thus you would get similar results. ??????

Austin

The HyTech is indeed 2.5" OD, the test pipe was a direct bolt-on, so I guess that I was incorrect when I stated that it had a 2 1/4" flange, sorry about that.

The test was conducted this way as Comptech was doing some R&D using my car, the next step will be to test the car with the current setup and swap it out for the HyTech exhaust system, which is a much larger cat from Random, and the 2 1/2" exhaust. I have the figures, so I figured that I would share them with everyone.
Austin

Akira-R

Cool!

I keep seeing those numbers rising!!!! Way to go!!!

--reid

Jason

when is this coming out (2.5"), this is what I've been waiting for any info from anyone that knows something would be greatly appreciated.

Leo95SE

well, to me, all this says is that neither will pass emmisions testing.. so why spend the $ for a cat id you can throw in a piece of pipe?

if a highflow cat is that close to free flowing - then my guess would be that it isnt passable...

anyone else agree? seeing as how i couldnt even pass with a random tech cat, which is more restrictive?

2fcknfst

Fix the fuel.

You are running too rich.

Austin

When I experimented with the fuel I managed to lose whp, the car seemed to like this setup the best...

Black R

Austin, I think 2fcknfst was replying to leo on how to pass emissions with that high flow cat...

Leo95SE

too rich at 45psi? i just think that emissions are getting stricter, and these high flow cats 'flow' a bit too well...

anyway.. id lilke to see nox and o2 readings with this cat.. if flowing well, and capable of passing - nice! otherwise, test pipe for me.

FAST94GSR

photopoint no worky for me, says pictures arent' available...

Austin

Sorry about that, I was organizing my photo albums, all fixed now.
Austin

FAST94GSR

Wow for the power you have, you don't have a complicated setup. Very nice linear power curve. I see you're running big injectors. What's your rationale for running 440cc? IMO that is way too big. Yea you can lean it out in the 5-6k to pick up more midrange. Lean your car up to 13:1 dead on and you'll probably pick a tad more horsepower. I like your car man,


[Modified by FAST94GSR, 7:01 PM 8/24/2001]

Digital-R

Dumb ???

What kind of dyno is that, unless you are telling me you are getting over 200 Whp with just the B's and a stock bottom end.

Dipshit Dan

I am very very surprised Austin but I'm curious to see your results after the Hi-Tech exhaust is installed.

Austin

Not quite, I think that there is a slightly different correction factor that is being used, it does use barometric pressure, temperature, spark, humidity, correction for gearing and a few others, just not sure of why the numbers are 15+ over my numbers from a dynojet...

It's a Dynamic Dynometer, which is used by Comptech, which is an Australian brand, it has a crummy DOS based interface at the moment, but has a very wide range of options...I like it better than the Dynojet for the datalogging capabilities, but the Dynojet is a more widely used brand of dyno in the states.

TypeR1558

Car is lookin good Austin.... can't wait to see it sometime in the future. Keep bringing up those numbers as high as they will go.... never quit!

Jon

t

So you are saying that the Comptech dyno gives 15 hp over that of the Dynojet?
That makes the comptech icebox numbers that Comptech gave me inaccurate, because I went by the dynojet numbers.

Bob#455

Basically, yes. At the DSR Dynojet, Austin dynoed at 192 whp.......here on the Comptech dyno, 207!!!!!! 15 WHP difference!!!!!! Have you ever seen the Comptech catalog? They claim some of their headers make 25 whp over stock.......now I know why .

Austin

Bob,
I find your comment fundamentally flawed...if the comparion was from a dynojet to their dyno, then I would understand, but when you are comparing numbers from the same dyno with the same correction factors, your statement is incorrect.

Also take into account that my car had 2 1/2 hours of driving before the dyno runs at DSR, whereas the car was tested at Comptech in the early morning after the car had been brought up to opperating temperature, any cause for the variance...no clue, I don't give a damn about what my numbers say, so long as there can be an adequate comparison for the test that was conducted.

As an example:
Comptech placed an RSX on the dyno, it put down 160 whp, they produced an exhaust and it now produces 170whp.

Group A in Hayward(Skunk2) placed an RSX on their Dynojet and it had what 170, or 180whp, which is exactly the opposite from what happened with me.

Just something for you to think about....

B18CXr

Nice to have some backing to the statment "F a damm test pipe".......I saw no gains with a pipe versus a cat on my setup also.........keep the plots coming Austin.

Bob#455

Austin, I find your ASSUMPTION of my comment fundamentally wrong. Obviously any properly operating dyno can be used to find changes in a car's performance before and after modifications. My point was, that the Comptech dyno tosses out very different numbers than a dynojet. If it shows a peak whp number that is 15 whp more than on a dynojet, then the changes that result from modding the car will also be different.... Any gains on the car can be best seen by looking at the % of change, so if the Comptech's peak numbers are higher, than the % change after mods will also appear higher. I think you just misinterpreted my original post... I was joking about Comptech's header dynos because they are so implausible. I have no issue with the graphs you provided, and in fact they are quite useful. Hopefully some people out there will decide to get rid of their test pipes now, since it seems they are doing more harm than good.

t

So that makes the Dynojet at Group A(skunk2) really off than giving extra high numbers, that would explain the controversy over this RSX. It also explains that built Type R with the B20 bottom that produced 265 hp and 160 tq, and a week later that motor was for sale on ebay. That guy probably knew that the GroupA dyno gave higher numbers, in an effort to try to sell his motor.

ghettoracer

*sigh* all these speculations, and no one knows any fact. owner of that motor got bid by the boost bug (after riding in one) and he wanted to sell that motor to fund his new one. omniman and I both thought he should've kept it because more could be had out of that engine, but he made up his mind already.

as for all these accusaions of group-a's dyno reads high or results being fudged, what could group-a possibly gain by posting a high RSX dyno result? can't you guys accept the fact that maybe this was just a lucky motor?

sheesh. and all you people that dyno and tune your car so much, please post some 1/4 mile times as that is the only true indicator of how much realworld power your car is making.

my b16a has always been dynoed at group-a. so you guys probably think my graph is BS. Run 61/62 is my B16A on JUN type 3's with Skunk2 ECU. Run 85 is OmniMan's race B16A engines with ~12:1 CR. Still a 1.6 with stock bottom end.