I have a 88 crx si with a b16A running stock exhaust.. it doesnt seem to be as fast as it should be.. how much gains should I get by getting a better exhaust system? is it worth 500$?

 

Stock piping on a si is 2"..? That seems to be large enough for a little stock 1.6L..Putting on an aftermarket exhaust will give you more power and tq but its going to be minimal,,like 2-7hp if you're lucky..Maybe your stock cat is clogged holding back the power..Or maybe thats just how it is,,I mean the b16a isnt the fastest engine in the world you know..

 

I dunno, I raced my friends 91 si hatch, he has a first gen B16 as well.. he was pullin on me , but my car is lighter, and i believe i am a better driver.. it feels like it runs strong, nothing terribly wrong with the car.. it does have an issue with the thermostat and a rough idle sometimes, other then that.. im not too sure whats holding it back

 

It's just me, but I believe from experience that first gen b16's have better throttle response, and seem to pull harder than the 2nd and 3rd gen. I've always liked the origional design of anything, like the 88 crx si. But to answer you question, yes it will net a few ponies, but I would definately look at your cat if it's old. Also your tranny has the largest factor on wheather your stock b16 will be fast for not. I'm a good driver and I'm still sporting a stock jdm b16 with y1 lsd tranny, and i've beaten ls/vtecs. Always stick with your b16 tranny, and don't get an LS!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugencrxsir1 &raquo;</TD></TR><TR><TD CLASS="quote">It's just me, but I believe from experience that first gen b16's have better throttle response, and seem to pull harder than the 2nd and 3rd gen. I've always liked the origional design of anything, like the 88 crx si. But to answer you question, yes it will net a few ponies, but I would definately look at your cat if it's old. Also your tranny has the largest factor on wheather your stock b16 will be fast for not. I'm a good driver and I'm still sporting a stock jdm b16 with y1 lsd tranny, and i've beaten ls/vtecs. Always stick with your b16 tranny, and don't get an LS!!!</TD></TR></TABLE>huh?

most gen1s are ragged to hell and they had smaller cams. Yes tranny matters a ton they have almost a full ball with a good tranny but with a LS tranny they are probbly good for high 15s if that.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ***-assin &raquo;</TD></TR><TR><TD CLASS="quote">huh?

most gen1s are ragged to hell and they had smaller cams.
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Thats why they have better throttle response..Those smaller profiles will give you more low-mid power then the 92+ cams..dont get me wrong they suck compared to the 92+ cams for making overall power,,but I agree with Mugencrxsir1 about the throttle repsonse being better on the 1st gen b16a engines then the others..And Ive used just about all the oem dohc vtec cams already so I speak from experience....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr.speaker &raquo;</TD></TR><TR><TD CLASS="quote">

Thats why they have better throttle response..Those smaller profiles will give you more low-mid power then the 92+ cams..dont get me wrong they suck compared to the 92+ cams for making overall power,,but I agree with Mugencrxsir1 about the throttle repsonse being better on the 1st gen b16a engines then the others..And Ive used just about all the oem dohc vtec cams already so I speak from experience....
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I understand the response from smaller profiles but what would make it feel like it pulls harder?

I've used a bunch of the OEMs myself, i just never really felt anything better from gen1 cams.

 

I never said it pulls harder(it doesnt to me),,just saying I agree with him about throttle reponse..

 

Well mine was a total pos so it just sucked lol.

I couldn't feel it and this is the first time i've heard anyone compare the throttle response, then again thats whats neat always learning somthing.

 

i have a y1 tranny w/ lsd, it feels like a mid 15 second car
my friends almost stock ep3 was pulling slightly in third.. that should not happen

the kid i bought it from was not the brightest in the world.. he sold it for cheap as hell, thought it didnt run good.. immediately i noticed the throttle cable was really loose.. bought it brought it home, tightened it up, seems to run fine, besides the power not being up to par..

the thermostat is weird, it takes 15 mins to warm up, then it will fluctuate every 10 mins or so from cold to normal temp, not sure what that is, i think it is affecting the idle as well..

tranny shifts fine smooth like butter in every gear, except reverse has a very slight grind about 25% of the time..

 

definatly check your catalytic converter. try fabricating a test pipe. mine was clogged and after messing with it i definatly noticed a gain, at any rpm, but very noticable above 6k rpms. before it would start to bogg around 5500rpms. it was so bad i couldnt get it to accelerate past 90mph without downshifting to 4th.... and even then it was slow going.

 

Ihave a 91 crx with a jdm b16 with stock cat and exhaust mine also feels like it should be much quicker.The stock exhaust seems smaller than 2",Ithink that is what is holding it back.I also have a 99SI and it seems much quicker with just I/H/E.Are you running both o2 sensors?

 

2 inches are you guys crazy? stock exhaust is like an inch, someone go measure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LShatchie &raquo;</TD></TR><TR><TD CLASS="quote">2 inches are you guys crazy? stock exhaust is like an inch, someone go measure</TD></TR></TABLE>

It's 2" crush bent on the si's..

 

I do believe it is 2'' stock, i took a look earlier, it is definately the original exhaust and the body has 190k miles, definately worth checking out the cat

hmm I dont know if im running both o2 sensors, i dont really know i just picked this up a few days ago, trying to get it to run to its fullest potential.. got a p3 ecu

 

Look at the stock exhaust manifold..there should be 2 o2 sensors in it and they should both be hooked up..One is hooked up already stock but when you do this swap you have hook up the 2nd one for the stock obd0 pr3 to run right,other wise it bogs alot..


The last one

 

on my dx, idk how much it differs from si's but my exhaust is 2" all the way up to the gas tank then it converges into a smaller pipe.

i have a ls motor running the stock exhaust, but when i ran open header at the track, i didnt really get any more than .1 faster

 

Factory pipe size on a stock SI is 1 3/4 for those wondering. Go to a 2 1/4 for an optimum all motor powerband.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deetz &raquo;</TD></TR><TR><TD CLASS="quote">Factory pipe size on a stock SI is 1 3/4 for those wondering. Go to a 2 1/4 for an optimum all motor powerband.</TD></TR></TABLE>

Thats inner.? I know outer tubing is 2"..

 

I ran the stock exhaust for a couple weeks when I put in my B16. I ran 2.5 and got rid of the cat. I noticed a big difference but the car sounds like *** now. I wouldn't recommend losing the cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blumpfish &raquo;</TD></TR><TR><TD CLASS="quote">i have a y1 tranny w/ lsd, it feels like a mid 15 second car
my friends almost stock ep3 was pulling slightly in third.. that should not happen
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you're dang right that shouldn't happen. I have a stock 1st gen b16a in my 89 DX, It doesn't have a rear interior (which doesn't help much Im sure), and the motor is bone stock (not even an intake for that matter), I do have 2.25 inch invidia exhaust though, and I ran a 14.702 on mastercraft tires that were almost bald.

It seems as if something is needing to be changed out . clean that filter if it hasn't been mentioned already, motor won't do a thing unless it's getting clean air, and on a stock b16a I would recommend upping the exhaust diameter to 2.25 at least. if you plan on going higher, as in cams,valvetrain later on, then you might wanna do 2.5 initially. I hope you get that figured out man, that's gotta be aggravating spending time and money on something that isn't giving you what you want.

 

The air filter?? yea it does look quite dirty, it has a piece of **** rubber tube intake, its about 4 inches long right out of the IM, sticking straight out, i was thinking changing that out would make a difference, but a short ram would not come out much farther, thats about as good of air as its gonna get unless i relocate the battery aand get a CAI..

im about to run some seafoam through it and try to clear up the rough idle, as well as a new air filter..

 

man expletive that 500 muffler just go to your local muffler shop and get 2 1/4 inch piping trust me is will cost you like 60 bucks then go home and hollow out your cat and trust me it will rip more than that 500 exhaust

 

Is your check engine light on at all?

 

no CEL's at all, i ran seafoam through it yesterday, didnt do much except smoke like a son of a bitch.. cleared up the rough idle a little bit.. no noticable different in power.