i recently installed a dc sports 4-1 header with the 2 1/2inch collector on my 92 teg B17a1.but i have a hks hiper catback which i think is 50 or 55mm and that is smaller than 2 1/2 inches around. so someone mentioned to me that the 2 1/2inch collector isnt doing me all that it could and said i may need a full 2 1/2 exhaust to feel the full gains of the collector. but if your familiar with the b17 you know that they are total **** on bottom end.plus my exhaust already has like no back preassure what so ever. so i was thinking that if i had a full 2 1/2inch exhaust then my car would lose what very little lowend it has.But i have noticed that with my current set up(aem short,header,exhaust,2 1/2testpipe)the car did lose bottomend but it pulls a little harder on the top.<this was exspected.So with this set up would i benefit or be hate'n it with a full 2 1/2 exhaust all the way back.Also i recently purchased,stainless steel valves, spoon 1ply headgaskett, typeR cams, and intake mani,hondata intake mani gaskett. how would the same question aply with this setup.

thanx



[Modified by AztecB17, 3:51 AM 4/17/2002]

 

can i get a little help here? lol

 

patience grasshopper.... I have no idea but Im sure someone here does. Just give them time...

 

Since your going to mod it so much, why not just dump the DC header and hiper catback? I would rather get a JDM header with a 2.5 system all the way back.

 

thanx


the dc i have i suposed to be the "jdm type r" i think its suposed to be like a direct copy but i know that the quality of the factory itr manifold is much better

you input is greatly appreciated
spelling^

 

the 4-1 design is the best for top end , even do'h you sacrifice the low end

 

Yeah, I didn't see that you got the DC JDM header. I would just suggest getting 2.5 catback later on to open the system up.

 

thanx alot once again.


what 2 1/2 cat back would you recommend

not many people make a 2 1/2 for the DA integra.

 

OK, there a bunch of things that are in conflict here but, we'll deal a little at a time.

First off, for your benefit When dealing with small displacement engines, You NEVER want BACKPRESSURE!

What you need to do is assess just how much Wheel Horsepower and Torque that your B17 is making. Then you can properly decide on a full exhaust manifold back setup. You don't want to mix and match different piping diameters since that will disrupt the flow of gasses and create unwanted turbulance which will certainly detract from any gains.

What you want to do is mate the optimum Inner Diameter Catback to an equally sized High Flow Catalytic Converter and Proper Exahaust Manifold.

As a general rule the following exhaust diameters are what benefit their prospective engine power output, "thanks to SMSP and Tuan":

2-1/4" up to 210HP @ the flywheel (about 180-185 whp)

2-3/8" (60mm) up to 235HP @ the flywheel (about 200-207 whp)

2-1/2" up to 265HP @ the flywheel (about 225-235 whp)

2-3/4" up to 325HP @ the flywheel (about 275-285 whp)

3" big for big HP (Forced Induction: > 275 whp)

and those diameters are from the header collector to the muffler, including the High Flow Cat or Test pipe.


Secondly, would be; Have you dyno tuned your car yet? And if so what is it producing currently? That would be the way to decide on what full exhaust system to install. You also have to decide on the entire buildup before the exhaust is decided or you may down the road need to purchase and install a new one if your power exceeds the systems parameters or in your case your car sounds like it is underpowered for a 2 1/2 catback.

Just how much HP and TQ is your car making? Because if it is making less than the above suggested, a 2 1/2 catback will not benefit your car and even may hurt performance. But, it has nothing to do with needing backflow. It has everything to do with proper exhaust gas flow and maintaining velocity and proper resonance.

With all you mentioned, you NEED to Dyno tune to fully extract all the performance gains. Otherwise you are just short-changing yourself and your car.

A.

 

thanx

i know i need to dyno my car but as of right know it is torn apart. and i know you should mate all inner piping daimeters to ensure that the exhaust flows as smooth as possible but with all the mods that ill have on it when its put back together i know it will not put out 180whp but if it ever does reach the 200whp mark then there is no doubt that i will upgrade the exhaust.i am aware that i severly need to dyno tune my car when its running again and that is one of my first objectives when its on the road agian. i dont mean to short change my car but my wallet has been short changed for a minute. thanx for the help i greatly appreciate it.
ps i know befor the new mods that my car was prob making around 140whp and at the time the 2 1/4 was exactly what i needed.


[Modified by AztecB17, 5:42 AM 4/17/2002]

 

Good luck then and hope it all works out.

A.

 

thanx grey teg
i learned from your post
i appreciate it

 

1GreyTeg that was a kick *** little piece of knowledge

 

i must agree

kick *** peice of knowledge

grey teg rules

 

Dyno proven, no loss is low end, just gain everywhere when change from stock b-pipe with Spoon N1 to a full 2.5" catback. Check it out https://honda-tech.com/zerothread?id=161409 The Kakimoto R is 2.5" at the cat flange and 67mm at the b-pipe. No section is less than 2.5"


[Modified by mafay2, 6:25 AM 4/17/2002]

 

Here is the results of the great header test. Read and learn about what headers did the BEST for the B18C5.
http://www.automotiveperformanceengi...om/header.html

I am currently running a Spoon 4-2-1 and Carsound 94006 HF 2 1/2"cat. I dynoed at 172 WHP and 126 PF of TQ. So according to my results, my car does Not warrent a larger diameter catback from stock but, could improve with a good 60mm catback without ANY restrictions like found in the stock setup. I have however not decided on a setup yet and may not do anything. I will be going back in the next few months for more extensive tuning and may decide on a new catback before then. Maybe not? I dunno... I just Do know that I don't want any loud blaring horn on the end of my tailpipe.

As for Cams, if I was looking to go for the magic 200 WHP and did cams, I would choose Toda B's and either an SMSP, Kakimoto-R, Type-1 or Hytech catback system for maximum gains. I choose Toda because I have experience helping tune them and driving an R with them. I choose those catbacks because of their diameters "2 1/2" and their quality.

Good luck,

A.

 

The dyno of the T.1R exhaust shows about 7 whp gains and no hp loses with the silencer but too bad we don't have an application for your DA-6 Integra.

 

thanx. i hope all turns out well with your car.


if i ever come up with the cash i would try to build a 200hp allmotor car and buy bigger cams but im still young and trying to come up at a rate where i can learn about hte stuff befor i just spend a bunch of money and no nothing but as of know im BROKE AS HELL.