Ok guys just as I promised...

http://www.teatrogalerias.net/timeslips.jpg

My best time had been 17.292 the last times I went to the track, I averaged around 17.450 in all my runs.

I set the tires to 23 preassure, instead of 28-29 and better results came up, I ran constant 17.0 flats...17.027 was my best times, I got 7 runs, If I wouldve gotten 3 more or so, I wouldve dropped to the 16.995 range, but next time I go ill do it.

The old time slip is the white one, its soooo blurry cause its old, and the one that I ran yesterday is the yellow one.

In december 24th im going to get an AEM CAI, my brother is going to bring it to me for christmas from the USA. Hopefully the AEM will reduce my time .2 maybe .3 seconds, so ill be in the 16s constantly.
Again im almost 5000 ft above sea level thats why the crappy times.

Thanks for all the help.

sweet man, i was like damn 17's and 19's from the golf wow
and then i remembered you were in mexico
sweet run man
love the car have fun with the intake

Yeah, I wonder, If i completely remove the catalyst converter I would gain little power or so they say, when I install the intake after christmas i think ill take the cat off...and see what happens with the times.

Catalyst off + Aem CAI = maybe 4-5 whp
yeah!

Yes, my friend told me the same thing about this: to put less air on the tires when making a run. Strange how that thing goes, but the proof seems to be here.

Yup, my buddy in his 98 TA runs between 15 and 20 psi in his M/T drag radials when he launches down the 1/4 mile. More contacting rubber equals better grip :)

My CAT is hollowed, something like a 15% gain in HP, probably not to the wheels but HP none-the-less.

So would you recommend revomving the catalyting converter totally off...Its Mexico, no problems with gas inspections, they dont do inspections...as far as performance will if help a litte? Will it reduce backpreassure resulting in less hp? Will it sound really loud.

Just hollow it out, don't remove it, if you do then you'll have problem with making a piece to connect your header's to your pipe... hollowing is pretty much removing it, because it becomes nothing more than another pipe.

Just hollow it out, don't remove it, if you do then you'll have problem with making a piece to connect your header's to your pipe... hollowing is pretty much removing it, because it becomes nothing more than another pipe.
agreed!

Gutted cat = back pressure

Ok so it helps. hollowing it out is making holes in it right? how big must they be, or how many? Do I do it myself?

Ok so it helps. hollowing it out is making holes in it right? how big must they be, or how many? Do I do it myself?

:screwy:

No, it's removing all the crap (filters) inside the CAT. Therefor it is "hollow".

No, it's removing all the crap (filters) inside the CAT. Therefor it is "hollow".
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Oh, Ok. Shit!. I had no idea man, I thought people were saying hollow it as in making holes...so I have to open it and then remove the things inside...mmm

dont gut the cat.

remove it and replace it with a pipe. a gutted cat is turbulence in the exhaust flow and would probably hurt power if anything.

i hav ea high flow cat with a DC Sport Stainless steel headers and a Tanabe Super racing medalion cat-back. The high flow cat gave me 7% more HP or was it nine? well i need to find the dyno sheet. also the t3/t4 turbonetics help a lot with HP lol.

The Hollow cat and Cat-Back exhaust gave me a 15% gain... :bigthumb:

Damn, thats a ver inexpensive mod, just remove cat and put a pipe and a 7% hp gain, thats a lot, from 160 that means i would go to 172 or something, I wonder how much at the wheels.

for all these "7% horsepower gain" people, if you dyno'd your car, you would know exactly how much horsepower you gained, since in order to find gain, you'd have to dyno each before and after.

Please dont state "gains" when all you do is feel the gain (OH IT FEELS SO MUCH FASTER, 7% FASTER!), or state manufacturers specs (THIS HIGH FLOW CAT SHOWS 7% HORSEPOWER GAIN)

show me some numbers.. dyno sheets, 1/4 mile times, anything. i want some hard facts .

If I had the sheets pre-Hollow cat I would post them but I can't so you can believe me or not, it doesn't matter to me. I'm running close to 190-195 HP off a B18A1 ... mods are listed, you tell me if that's a good gain or not. :grinno:

Seein as how hes in mexico, he might as well put a test pipe on. Its straight through like the high flow cat, but less turbulence like 91civic said.

yeah i removed iy cat and put 2 1/4 inch ehaust from the manifold back its louder has les back pressure and adds about 15% more horse power. when i did it it took of a half second in my 1/4 mile. but no affence or ne thing but if your car is and SiR why are you runnin a 17 second 1/4 and dont say altitude i live in Idaho its 6'500 feet up i had a SOHC euro ZC with carb and i ran a 17.3 and i have time slips to prove it. now i have a B18A1 and havent ran it at the track yet. just sayin that SiR should be runnin like high 14's to low 15's thats all. but ne ways replace the cat.

Yo KoRnBoy what do you run with your integra, just so ill know. i dont exactly have all the stuff you do but i have a ram air intake, full exhaust, no power steering, and no A/C. but ne way what do you run if you know.

Yo KoRnBoy what do you run with your integra, just so ill know. i dont exactly have all the stuff you do but i have a ram air intake, full exhaust, no power steering, and no A/C. but ne way what do you run if you know.


Sorry don't know yet, I'm moving back down south in a couple weeks and then I can take it to the track. I don't even want to speculate on times, I'm not expecting very low times, though should I be surprised to see 16's or 15's?

With the cat... just goto any exhust shop and ask them to cut it out and remove it, they may charge you less if you let them keep the cat, or pay full price. and then if you dont want it... sell it to a scrap metal place the metals inside it that you smash out when gutting it are very poisonous but worth abit $ if sold and its not easy getting under the car and undoing stuck exhust bolts, in the long run its much easyer to just bring it in then you dont have a big hollow box in your system making large amounts of back pressure.

Sorry don't know yet, I'm moving back down south in a couple weeks and then I can take it to the track. I don't even want to speculate on times, I'm not expecting very low times, though should I be surprised to see 16's or 15's?

If you're pushin 190-195(170 to the wheels) like you say, you should be in the 14s. Assuming you're a good driver. :smile: Let us know.

yeah im gonna go with him with high 14's to low 15's i have a friend that had a stock 4 door that ran a 15.9 1'4 mile. thats where i got my B18A1 from.

Yup, my buddy in his 98 TA runs between 15 and 20 psi in his M/T drag radials when he launches down the 1/4 mile. More contacting rubber equals better grip :)

Also helps them heat up quicker...

so..for racing..the car with out A/c is better and lighter than a car with A/c??and if you take the cat out ..you probably gain 15% more horse power? is this true?then if it's true then I'll go to the shop and remove my cat...the sound is louder? and are we going to get ticket for that? or the cops wont know...

How much is the ACT Stage 3 clutch??? and where can I get it?

The Clutch was in the car when I purchased it, but I believe they run about $250 ... not sure, complete guess. Gains from the CAT differ from car to car, with my set up I noticed a 15% increase of HP, with a full Cat Back Exhaust. Yes you can get a ticket, it is illegal to have such a mod, a car with out a CAT is not up to emission standards, though in the case of a hollow cat unless they take it off they won't know and yes it is a little louder, not much... it gave the car more of an "import pur" as I like to call it :naughty: Not SUPER loud and ricy, yet not Redneck truck low either, if you can relate to what I mean by that. Not very good at explaining sounds. :naughty:

hahaha you got a 15% increase in hp from having a catback exhaust and a hollow cat :lol:
you probally gaine 3hp from those 2 mods :lol:

hahaha you got a 15% increase in hp from having a catback exhaust and a hollow cat :lol:
you probally gaine 3hp from those 2 mods :lol:


:loser:

You're right, but I have more than just those two mods :rolleyes:

Gains from the CAT differ from car to car, with my set up I noticed a 15% increase of HP, with a full Cat Back Exhaust.

:loser:

B18HoNdAcIvIc
yeah i removed iy cat and put 2 1/4 inch ehaust from the manifold back its louder has les back pressure and adds about 15% more horse power. when i did it it took of a half second in my 1/4 mile. but no affence or ne thing but if your car is and SiR why are you runnin a 17 second 1/4 and dont say altitude i live in Idaho its 6'500 feet up i had a SOHC euro ZC with carb and i ran a 17.3 and i have time slips to prove it. now i have a B18A1 and havent ran it at the track yet. just sayin that SiR should be runnin like high 14's to low 15's thats all. but ne ways replace the cat.
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Man, I dont think the straight pipe no car will take half a second of my 1/4 mile. Im happy with .3 seconds, very happy. And its impossible for my car to do high 14s low 15s in my city, its 5000+ above sea level.

And I dont drive bad or normal, I drive good. Ill post a vid of me driving in the 1/4 mile so you can judge me. Probably the best driver in the world will pull 16.75 while im pulling 17.027 and a normal drivers (which ive lent my car to ) usually pull 17.3-4

I find it hard to believe that a simple exhaust mod would increase HP by 15% - or drop ET's by a half second. How do you guys figure you're gaining "15%" anyways? If we're talking about sub-200 HP cars here, you're telling me a simple cat-back & cat delete is adding 30 HP? :headshake

I'm not into import tech, but it seems to me that a 2.5" exhaust system is pretty big for these types of cars (correct me if I'm wrong). I can tell you that it is not uncommon for V8 F-Body/Stang's to loose HP when overdoing it with 3.5" or 4" exhaust systems - it is actually torque in some of these cases that is lost due to the decrease in back pressure.

I suppose since imports motors are typically all high end, any loss in TQ wouldn't really mean that much (perhaps the gains in high end HP would offset?), but really, there is no way of knowing how much more HP the car is putting down unless you dyno it. Even if something says "add 8 Horsepower!" it doesn't mean shit - it could add 4 rear-wheel HP to one car and 1 rear-wheel HP to another. :2cents:

Yeah true. 15% is crazy. My engine is 160 hp, itll probably add 3 WHP. Which is good considering its a cheap mod.

Yeah 15% is crazy, hell I didn't believe it till I saw the sheet, before the rest of the work was done to the car it had 160 HP and after the work it had 190, now I do remember saying (maybe I forgot to add this earlier? been a long week), there was more work done WITH the cat-back and Hollow cat that was done, so it's not JUST those two mods, it was about 4... I forget which, but hell it's putting 190 and maybe what? 155~160HP to the wheels? No clue how the math goes on HP and WHP... so that's a complete guess.:2cents:

Well no affence but i dont think that you are reading your block wrong MexSir because i have never seen a (DOHC) VTEC run a 17 second 1/4 mile, for that matter ive never even seen one run a mid 16 second 1/4. you wrote that you have 160 hp well for one the B16A2 comes stock with 170 hp and i live in IDAHO thats in the rockkky mountains its almost 6000 feet where i live and i have a buddy with a 1999 civic si he only has an AEM rai and catback exhaust he's runnin a 15.2 so either you just suck at driving or your lying your a** of about the engine you have. i dont care what you say about the elevation DUAL OVER HEAD CAMS dont run 17's you must have the D16Z6 which is a (S I N G L E O V E R H E A D C A M) 1.6 liter VTEC engine cuz thos have a tendency to run low 17's. but im tellin you, you could be on top of mount everest and still not run a 17 second 1/4 mile with a B16A2. thats a 170 hp engine 116 ft/lbs of torque BONE STOCK i know your isn't stock so there's no way it runs 17's thats, that.

he has posted time slips PROVING he runs low 17's. and with high elevation, how many cams you have is irrelevant.

B18HoNdAcIvIcA1 --- Man no offense, but you dont know what your saying. I run 17.0 stock and thats driving almost perfectly. Not lying, people have seen pictures of my car, I back up my posts with slips. Correction a B16A2 HAS 160 HP!!!! Yes I have a 1999 civic si, yes it runs 15.6 at sea level, I tested it one day ago, I was at the beach, I did a 15.87 run!!! Not in my city!!! 17.0 best I can get. A ferrari modena ran 14.4...

It is not a decrease in backpressure which is the cause of less power with bigger pipe. It is loss of optimal exhaust gas velocity. If you really want, I'll give a more indepth explanation, but I hope that isn't necessary.

Inferno. A little explanation will be helpful, what I dont understand is...If I remove my cat completely and replace it with a straight pipe, gases will come out of the engine more freely, resulting in less back pressure because the exhaust gases are coming out freely...so how does removing the cat increase power?
Thanx.

a stock honda accord, f22 class runs it in a high 15 sec stock so i mean damn....

This is neat, but true

torque x rpm / 5252 = hp try it

This is how hondas make power, the have low torque, but turn high rpm's

accord f22 high 15 sec, dont think so, the accord v6 200 h.p makes it in low 16s, so a 4 cylinder wont be able to do it in the 15s. Probably more like 16.8-17.0 sea level. I just tested mine in sea level, 15.87 quarter mile. Fucking altitude, hate it.!