what do you guys think about doing this,it's a d16z6 with a 50 shot do you think i'll benefit from doing this i already drove the car around and it pulls a bit harder in vtec on the spray but you know you can't go by the seat of your pants always,i just wanted to see if any of you nitrous guys have done this and what is the result,thanks

 

well I an open header with the bottle mainly to drop the 30 pound exhaust, I think I did it more for the sound than the gains, heheheh, Jason

 

It won't hurt anything except for your ears. I'm sure you'll be some gains from it.

 

thanks guys,but do you think i'll gain some power and mph from it,and yeah it sounds nice with it off also i benefit from the weight savingand thanks again guys

 

you'll drop et from just the weight loss... may see a trap gain but it may be minimal.

 

All I have to say is just do it. I doubt that it will hurt at all. Why not try it. Plus your car will sound so mean. Get it on video next time you hit the track.

 

you'll have NO gains, car will slower by 1.5 tenths and 1.5 mph in the quarter mile.

with full exhaust and 2.25" test pipe 13.10 @ 103 mph
with ehaust cutout opened 13.24 @ 101.5 mph

 

wow, who woulda thunk it?

 

Is there still any worry anywhere about burning valves? Also, has anyone here ever tried "chalking" the exhaust?? It's an old hot rodder trick, where you put a straight pipe on your car to the back of the car, and taking some chalk and marking a line on the pipe after you run a few times, you look at the chalk and the line will burn, where the burning stops, you cut the pipe off, and that will be the proper length for an open exhaust. As far as Mista Bone, I'm just wondering. What were the weather conditions on the days you ran? was it the same day? Just wondering....

Clayton

 

look I totaly agree it could affect performance, so please dont take this as an attack, but could the time difference be from different day, different condition's?Also that style cut off could it affect flow different?Just a thought, but I also did not notice that much difference dropping the exhaust, I did it for weight difference, by running skinnies, no exhaust, and no front passenger seat I gained 2 tenths, but I think it was the sum of all changes not just the exhaust.Jason

 

thanks guys well i guess it doesn't hurt to try it,well except your ears

 

Don't even bother. I tried it this summer and ran 2.5 tenths slower. I even did three runs to make sure that it wasn't just a bad run.

 

This is with nitrous, correct?

Maybe you guys are losing time at the tree from spinning so much. I gained 5mph and dropped .3 sec with an open dump. 60ft times were pretty much the same too. (2.1)

 

5 runs, about 45 minutes apart on same day.

Went 13.10 @ 103 on 85 shot.
I just jacked up right side with puny factory jack, used 2 front tires for jackstand as safety measure, uncapped the exhaust cutout.

Loud and could barely do a 2nd gear burnout. Ran a 13.24, then a 13.26.

Capped back up, did a 13.11, then started detuneing for I only needed to run 13.9's for the quick class. Ended up on Sunday going 13.31 on a 60 shot.

NEED bigger injectors!

Yes, I am that consistant.

 

Prelude_RCR, I run slicks, launch at 7000 rpm. Spinning is not a problem.

Wanna be consistent and be able to SEE changes, get slicks, PERIOD!

 

first of all running a cutout isnt the same as running open header, your disruppting the air flow...also it depends on the motor...the smaller 1.6s arent gonna benefit as much from this...an h22 on the other hand could...i ran 101.79 last night with just i/h/vafc/cam gears in my 93 prelude....im gonna try to go fri and run once with it hooked up, then unbolt it...see what it runs..peace

 

Bring gloves.

 

I've ran open header before, car was a DOG.

Shot nice flames every now and then though.

 

Wouldn't you have to worry about cool air blowing back up in the open header and bending some valves when you shut off the motor since the weather is so cool now? At least have a bend or something in the pipe if you run open header?

 

how would that happen if the car is always blowing out never sucking in from the header

 

I said when you shut off the motor. It's still very hot inside and if a cold breeze goes under your car, into your header, and up into the valves the shock of cold air on the hot valves could cause them to bend or crack. I heard of it in the muscle cars but I wasn't sure if it is a major problem with hondas.

 

ur scaring me now

 

That is a domestic wise tail, the cold air is not gonna rush up a hot exhaust manifold any ways because of the pressure difference, even with the motor off, the hot air creates a hih pressure area, be the time the exhaust manifold cool's the temperature difference wont be enough to shock the bottom of the valve , if open or closed.I ran open header with nitrous for years in temps as cold as low 30's high 20's no problems on bone stock b16's.I love hearing that one.Jason

 

I figured it was but you never know, just didn't want to tell him afterwards if it was true

 

I run open headers all the time just for effect and I can tell you that you drop your low end torque, but it breaths better in the top end. it all depends on your setup as to whether you will have any gains or not. a lot of cars cant handle loosing that much back pressure. its kinda the same reason why a civic with a 4 inch fart can is slower than my civic with the same year. higher displacement engines or turbo engines should see a gain, but lower displacement engines may see a loss.

PS:I like to run open headers on the turbo buick... I have a specially modified exhaust just for that, and its not a cut out...its a custom setup