Years ago I had cut the resonator out thats between the MAF and the throttle. Also I had cut everything forward of the filter out.

About this time last year I got tired of the constant groan and went to the junkyard and got stock pieces and and returned everything to stock. The first thing I noticed was silence the second thing I noticed was torque, the car lurches eagerly at par throttle. The third thing I noticed is although it lurches at part throtte not much more happens wide open. I definately lost significant top end. It felt like a diesel.

I haven't regreted doing this, the responsiveness at part throttle is worth it to me. Lets face it, the VG is not gonna win an acceleration contest no matter how much you open up the engine.

So, on to the point of this post...Do you think I would get a similar effect by reverting back to my stock y-pipe? I don't really recall a loss of torque when I put installed it, but I was driving mostly wide open back in those days.

Here's a pic from warpspeed showing the stock vs theirs.



I can definately see how the warpspeed pipe opens things up and this is proven to add lots of hp when you're running ***** out. But nowadays I look at the stock pipe and think Nissan was on to something. It looks like an effort was made to keep both sides of the engine at equal length. Also notice the back cylinders actually exhaust toward the front. There has to be something to this. I wonder if this pipe was tuned to create pulses that suck exhaust out of the cylinders.

Also note the warpspeed pipe is larger in diameter than the rest of the stock exhaust which means it slows things down.

I know we can only speculate about these things. But what could ultimately come of this is somebody gets to swap their stock pipe for my warpseed.

I'm getting old here and I just want a quiet, responsive car and I don't care about topend.

 

you do have an idea going about how nissan's design might have been something innovative.

although i don't know much at all about the true workings of exhaust gas flow, but the only thing i can visualize by looking at the stock pipe is gasses from the rearward cylinders actually flowing back up TOWARDS the front cylinders, causing the forward gasses to have to push them BACK towards the rear, causing a little bit more of the gasses to flow back up towards the rear cylinders....and so on, and so forth..

i don't really know enough to really say that is what happens, but that's what i visualize when looking at it.

it seems the Y pipe would cause less backpressure in the exhaust system of our cars.....due to more efficient rearward flow for both sides of the engine.

i dunno....im trying to help here ;x

 

if you do put the stok y pipe back on I'll take the warpspeed off your hands.

 

First..lol @ 25 being old.

Second..You had a warm air intake setup,before going back to stock.This types of intake setups are imo worthless, a full cai with the filter routed outside of the engine bay is the way to go if you want a little more get up and go in the warmer month of the year.

Last,keep the warpspeed y-pipe,the gains from gas mileage compared to the stock y-pipe are enough to leave it on there.Yeah,you get a little more growl from the warpspeed,but c'mon old man it's not that loud..

 

The stock pipe was designed for quiet,nothing innovative about it.

 

The main thing that bothers me about the warpseed pipe is the size of it. I'm afraid at part throttle it just sits there like a big ol resonator collecting gasses that are waiting to get down the narrower pipe going out.

I might try this one and report back with my experience:



Its an oem style replacement with no stated performance gain, so it should be stock diameter.

 

I just took off my VE stock Y-pipe, If you want to trade it's sitting in my carport, hah...

 

I felt a bit of a low end loss on my VE when I had it installed, but I also installed a UDP at the same time along with other maintenance items.

 

the stock one might be designed to warm up the cat-converter earlier?
better cold motor emissions just guessing though

 

the stock design was fine, but the aftermarket ones will net you some gains across almost all of the powerband.

If you want the quiet, but the stocker back on. the loss in power just isn't that much, and if you don't care about speed, then you'll never miss the 5-10hp you get through the power band.

 

Yeah, the way I understand it is, technically the Y pipe is emissions illegal. When you first start it up, the stock design pipe allows the cat to get to the proper operating temperature more quickly. So the Y pipe engine is putting out a higher amount of emissions for a few seconds after start up, which is technically a no-no.

Of course, when we take our car in for emissions inspection, its all nice and warmed up.

 

you still have the same amount of exhaust gas flowing through the cat with either pipe. you're really not going to have much different in exhaust gas temp at the cat.

 

heck ya ill swap em ><

-B

 

Agreed, it will take more than a few seconds to warm a o2 sensor up with just exhaust gasses alone, it would be more like a few minutes, or even 10 minutes in cold climates. Which is why out cars have a heated o2 sensor. so a Y-pipe isn't going to change anything.