16.5 hp and 14.9tq. Now without a dyno of the car with an aftermarket y-pipe its hard to say how much you gained over it.

What are people getting with just adding y-pipes. I dont want to quote numbers as I dont know them off the top of my head.

 

If this debate is still going on by June when I move back to AZ, I'll be happy to be a dyno guinea-pig. I'm not stock or near stock though, so my results might be different. On the other hand, I do have a Cattman Y-pipe, so perhaps my car would be ideal for your comparo so that people can see what your headers have gained over your Y-pipe with basic mods such as intake and cat/b-pipe.

 

No, its reasonably easy to estimate how much the headers gained over a y-pipe. I understand that people want to see a graph, but the fact remains that its pretty simple to make a reasonable estimate of the performance difference between the two parts.

I think the question has be limited to "what kind of numbers did this particular car get with a y-pipe" rather than what range of results are occuring over different varieties of y-pipes on different engines with different stock power outputs. Obviously I didn't have any fresh dyno data (w/ y-pipe) to use for a baseline or I'd be using it, but based on many previous dyno runs with similar but not identical equipment on it (I used it as my test vehicle for five years so I knew the car quite well), my reasonably accurate estimate was that about 40-45% of the gain was attributable to the header, beyond the y-pipe.

This was on a 100k mile 97 VQ engine, and the prototype headers I tested did not have the ceramic coating inside and out that the production versions do -- its not just eye candy, in a part with all this tubing that heat conservation is easily good for a 10% increase over what the part does without the coating. They seem to do somewhat better on the later model VQs that make 225 instead of 190 hp since the 00/01 engines make more power in the upper rpm ranges to begin with. I'd expect the headers to have a larger proportional advantage over a y-pipe on those engines.

The peak hp and torque differences you mention are the easy numbers to pull from a dyno, but are a very limited part of the picture. A fair bit of the the headers gain across the rpm range involves margins greater than 16.5hp and 14.9 tq; and the average hp/tq figures across the rpm range say much more for the overall, usable increase in power.

One can argue all day how much to pay for each aftermarket horsepower, but that's a matter of personal choice, and obviously you pay more for the last horsepower you put on your car than the first. The cost per hp for a header is more than a y-pipe but if you're determined to gain every hp you can, the only way to get this particular horsepower is to install the header - for some that will be worth the cost at whatever stage of their performance strategy and for others it won't ever be, or not until they're really squeezing out the last available horsies.

Brian C Catts
Cattman Performance

 

I don't get too caught up in finding a "virgin" test vehicle. Seems like the results are more representative and easy to relate to if there's at least an intake on the car and ideally a freer-flowing exhaust so the lack of those parts does not hold back the effect of the headers. You are correct, as long as your modifications are typical, doing a baseline run with the cattman pipe and and then a comparison run with the cattman headers would work out great.

You're welcome to be the guinea-pig when you get back to AZ, if Iceman and I don't work something out in the meantime.

Brian C Catts
Cattman Performance

 

I have a 2000 maxima auto with intake y-pipe and catback and ran a 185.9 HP and 171.8 TQ My first dyno without the y-pipe was messed up so I have nothing to go off of.

 

I hope you all take Brian up on his offer to email you the spreadsheet of my runs...

Why continue debating this here, when the numbers will speak for themselves...

Oh, and my butt dyno says these Headers Own any Y-pipe!!

 

well since I got to take care of the accident I am putting the headers on the back burner. But the only thing that keeps me away is the fact that I would need to sell my y-pipe and if these headers make alot more it's going to be hard to get rid of.

 

Huh?

 

Because your max is supercharged and your dyno is useless to anybody without a SC

 

I'd take Brians' 4th gen. dyno results over his.

 

to sell the y-pipe cause everybody would consider the the headers, but you get some people that would not pay for the headers and would buy the y-pipe.

 

True to an extent... I think though that the original issue that was brought up, was that people didn't think that the header was making power throughout the whole RPM band...

Looking at the raw numbers/graph that Brian put together shows this to not be true...

 

True, there's always going to be a market for your Y...

 

Anyone in the L.A. area is welcome to take a look/ride with me if I'm available...

 

Nice numbers. Hope we can get a proper comparison between stock, aftermarket ypipe, and headers on a n/a 5th gen soon. I was planning to get cattman headers but blew all my money on illuminas.

I would love to get a ride in your car. I've never been in an SC'd maxima before. Where is west hills? Thats off the 27 right? Maybe we could meet up one night. My car is in the shop but i should have it back next week with my suspension installed. That is if my struts ever get here...they got sent to the wrong address.

 

i'll hitch a ride with you during lunch on the dyno day

 

West Hills is in the San Fernando Valley....

I'll be in Brea all next week though, if that's closer...

 

You got it..

 

Im fairly close to both...ill PM you when i know whats up with my car.

 

ok........

 

Can you please elaborate on this. Their are alot of 02-03 guys waiting for the Hotshot headers whose sales you might capture if you can provide more info on this. I know SR20DEN put your headers on his 02 Max with some minor fitment issues but was happy overall. What I'm saying is that I'm willing to be sold on you product (I love your Y pipe) but I need much more info. Perhaps a seperate thread should be started on this topic.

 

Y pipe numbers are way inflated. I recall that whey I dyno'd both my y and an intake (it was either the SI or PR CAI - don't recall) I made about 10 whp over stock and a few lb/ft of torque.

Here's the graph. Y made power from vias changeover all the way to redline. Ignore the plot from when my vias was broken.

http://web.tampabay.rr.com/maxgator/...revsafter3.bmp

There is no way any y pipe is making 18-20 hp.

 

Uh oh, don't let Sprinty see that dyno plot, even with the failing VAIS, your UDP is showing no gain from 1700-5252rpms


Dave

 

Ding Ding Ding . . . we have a winner. No demonstrable gain from the UDP on my 5th gen below changeover. However, the UDP has been effective on the 4th gens.

 

Got link? I feel I'm missing something here.