Any guy with dyno numbers... (Warpspeed y-pipe)!!

 

Warpspeed sent me the wrong B pipe and for the last 2 weeks it's been going out in the mail every day. I have the Y pipe on and I dyno'd just before putting it on. If everyone wants to split the $75 cost of the dyno, I'll do it, otherwise I was only gonna dyno after the Y and B were both on.

 

How about you buy it and dyno it yourself

 

Yup: -2HP, -3#'sTQ

I'm working with a local performance shop to replicate the stock design of the y-pipe (with equal pipe lengths), and expect to see positive gains. ETA is 60 days... I'll be sure to post the results.

 

Here's my results, per the the DynoJet RunViewer software:

Magnaflow muffler and WAI:
212.71 HP and 240.44 ft/lbs Torque (SAE Corrected)
213.51 HP and 241.35 ft/lbs Torque (Uncorrected)

Warpspeed Y/B/Cat, WAI, and Exceleron muffler:
205.83 HP and 220.64 ft/lbs Torque (SAE Corrected)
208.68 HP and 223.70 ft/lbs Torque (Uncorrected)

Warpspeed Y/B/Cat, WAI, Exceleron muffler, Greddy E-Manage:
212.38 HP and 223.63 ft/lbs Torque (SAE Corrected)
222.31 HP and 234.08 ft/lbs Torque (Uncorrected)

The Magnaflow dyno was done in Florida. The other two were done in Maryland, which accounts for the SAE calculation difference between the dynos. This is why I provided the SAE calculation and the Uncorrect numbers.

Once you install the Y pipe, you more than likely will need some form of air/fuel management. The Greddy E-Manage or the APEXi S-AFC will work. The shop that I was at recommended the Greddy over the APEXi unit. I didn't know anything about the Greddy unit, but I went on the word of an installer that had already put one in another Maxima. Since he said that it put down better numbers on the dyno, as well as being "hidden" from view, I choose the Greddy over the APEXi (although I like the look of the APEXi). I'd rather stay as stealthy as possible when it comes to engine mods.

On the other hand, I'm working with Dallas over at WarpSpeed to try to resolve some install issues with the piping. I've discussed (at length) the things that I found, and he had a Maxima in there last weekend to evaluate them as well. I'll post another thread when I know more.

 

I dont like this numbers

 

And here's the problem with the WSP Pipe:

Stock: The front exhaust manifold & downpipe have a greater distance to the collector than the rear manifold downpipe. To compensate for this unequal length, Nissan put that large u-bend in the pipe.

WSP: Because they eliminated the large u-bend (which was in fact mandrel bent, so no additional restriction was created by having this bend there), thus creating unequal pipe lengths.

For performance you want equal length pipes. So WSP would have to make the rear exhaust pipe longer ( the same length as the front.) As each cylinder pushes the exhaust into the pipe you get a pulse of pressure, if the lengths are equal the pulses are smoother & don't fight each other, this allows for better flow for increased hp.

Using this theory - I expect to take my WSP pipe to a performance shop shortly, have them cut off the rear downpipe flange, weld on a mandrel bent j-pipe, put on a new flange, and hopefully see gains - as this pipe will resemble the Nissan stock pipe in design. Remember, the restriction in the stock y-pipe is NOT the downpipes or u bend, but rather the 2" collector.

 

I thought the WSP pipes were diameter trimmed on the shorter pipe to even out the flow? I have an 01 and the Cattman Y is certainly not trimmed, the lengths are very unequal, but the power gain is certainly there none the less.

 

 

I might be reading this wrong but it seems like the best dyno results come from just a muffler and WAI, even better than the setup with the Greddy E manage. Is that right?

 

Sorta. The WAI/muffler had the highest peak value, but the Y/B/Cat/WAI/exhaust/Greddy had better top-end HP. The WAI/muffler had higher curves in the lower RPMs, but dropped off at about 5000 RPMs. The Y/B/Cat kept climbing all the way to 6200 RPMs before dropping off.

I have yet to finish testing/tuning the Greddy E-Manage, so I can't tell you that those numbers are optimum. Also, I've installed a UDP, so I won't have the numbers in optimum format without the addition of the UDP. I'm working on getting a block of dyno time scheduled soon.

 

studman,Sorry to get OT for a minute but Any word on that aftermarket MAFS that you talked about before???....

 

A lot of people have assumed that the Greddy E-manage or Apexi was a waste for a NA max. I'm glad you're showing us that it can produce some significant results. Thanks for all the info you're providing.

 

I'll call my contact this coming week. I know they said that they could make them. Just waiting to hear how long and how much it will cost.

 

Thanks Org. memeber studman. Keep me as well as other Org. members informed on this. Been dying to put my Franken on.