bgates1654

Since nobody is willing to host the scans for me I am giving the info in text form.

Experimental:
The analysis was conducted at Big Shot Dyno & Performance, Inc. 6381 Chittenden Rd, Bldg C Hudson OH 44236, using a Dynojet 248C with the technique of 3 runs stock and 3 runs with the exhaust all done by the owners with a 10-minute cool down time between runs on the same day. Their phone number and website are 1-866-DYNO RUN (toll free) and www.bigshotdyno.com . Fuel used was approximately 92-93 octane. Test vehicle is a 2003 Nissan Maxima SE with a 6-speed transmission with no modifications prior to the exhaust.

Environmental Conditions for the First 3 Runs:
Times: Start 4:50pm End 5:11pm
Abs Barometric pressure in in.Hg: 28.81
Vapor pressure in in.Hg: 0.65
Intake Air Temp (F): 76.1

Environmental Conditions for the Second 3 Runs
Times: Start 7:20pm End 7:41pm
Abs Barometric pressure in in.Hg: 28.82
Vapor pressure in in.Hg: 0.56
Intake Air Temp (F): 76.7

Results:
Run1 peak hp/tq: 207.8/221.1
Run2 peak hp/tq: 209.9/226.8
Run3 peak hp/tq: 209.4/227.6
Run4 peak hp/tq: 212.6/229.8
Run5 peak hp/tq: 214.5/231.9
Run6 peak hp/tq: 215.4/231.0

Run1-3 AVG peak hp/tq: 209.0/225.2
Run4-6 AVG peak hp/tq: 214.2/230.9

Difference of AVGs hp/tq: 5.2/5.7
Difference of best/best hp/tq: 5.5/4.3
Difference of worst/best hp/tq: 7.6/10.8
best/best peak gain (not necessarily at peak output) hp/tq: 6.2@5300rpm/7.1@4300rpm
There is an average gain of about 1.8hp between 2600-3900rpm and about 4.0hp between 4000-6200 (note: limits are 2600 and 6200rpm no further data is available). There is an average gain of about 2.9tq between 2600-3900 and 4.2tq between 4000-6200. This is to show that gains are throughout the entire range with some minor dips at 2900rpm (+0.4/0.6), 3800 (0.3/0.5), and 3900 (0.8/1.1). Every other gain was about 2.0 and above.

Conclusion: Not too bad of gains for a rather inexpensive system. I was told that perhaps my ECU hadn’t been able to use the full potential of the system because once the system was on I drove it about 2miles to the dyno shop and dynoed it. However I was told by my brother, an ASE certified mech, that the ECU learns most if not all its going to in the first couple minutes. I can see whether this is an issue or not by getting another dyno done on a day with similar environmental characteristics. However I have already spent 130 on the dynos (65$ for 3 runs) and 273 on the system and my wife is kind of bitter about it. If people were interested in seeing this dyno done or if you want to just say thanks for the info you can donate to the cause at my paypal account bgates1654@yahoo.com . Once I have reached 65$ in donations I will get another dyno done to see if the ECU had enough time to "learn" the exhaust system or not. Thank you and I hope this is of help to you all.

Editted for spelling, grammar, and double letter errors.

ICULookN

iTrader: (3)

So the average gain is about 5-7HP. I guess that comes from the B-pipe since we don't get anything from the y-pipe.

MAXINXS

Good stuff! Thanks for the info.

y2kse

iTrader: (1)

Back when the 5th Gen was released in 2000, Sport Compact Car recorded a 5 hp increase with a pre-production HKS catback system. So a 5-7 hp increase for an OBX catback on the 3.5L engine is about right. Anyone that says you can make more hp than that with just a catback system is simply blowing smoke.

awsker

iTrader: (6)

can you take pics of it installed?

GreekMaxima

how about the sound... it has a deep tone?

SR20DEN

iTrader: (7)

Keep in mind the gains on a Nissan will be instant. Anything the ECU learns it says "srew you" and de-tunes the car back to near stock. usually within a few days. If the ECU programming was changed from a$$hole mode to something more mod friendly we would see better gains on everything.

hct67

iTrader: (1)

What do you mean the ECU will change itself back to the stock? I understood the ECU when mods are done changes and stays that way! Am I wrong?

mzmtg

iTrader: (11)

So the ECU will actually ignore increases in airflow to maintain a stock HP level?

I dont think so.

SR20DEN

iTrader: (7)

That isn't what I said. I said de-tune once it sees the increased air flow. Haven't you been keeping up with Chestons progress on the 350Z ecu program? It all makes perfect sense too. I always get my best gains on the first day of a mod then it fades out over a couple of days. It explains why various mods give Nissans crap horsepower gains.

hct67

iTrader: (1)

So your saying, after unplugging the battery and letting the ECu go to sleep for a few hours, then connecting the battery back up will only give you gains for a few days and then its back to normal again. Hmmmmmmmmm this just doesn't make any sense to me. So the only way to really have the ecu work correctly would be to do all mods, send out the ECU and get it reprogramed

y2kse

iTrader: (1)

So lemme see if I've got this right. If I put a supercharger on my Maxima, it will only increase horsepower for a day or two. After that, the ECU will de-tune the engine right back to its original horsepower rating. Is that right?

03BlkSETE

iTrader: (3)

bgates1654

There is a pic floating around here somewhere, but it looks different from mine. In that pic the exhaust tip sits about 4 inches behind the bumper and isnt too noticable. Mine however is flush with the bumper and can be seen easily from the back and side. If you just wnat a pic of the exhaust its the H-type exhaust shown on obxperformance.com I think that is the correct site. I will try to get a sound clip but the reason I didnt have the scans of the dynos posted was because nobody offered to host them for me when I asked so I doubt I will be able to find anybody to host the sound clip.

soundmike

iTrader: (24)

PM Me, i'll host them - pics and soundclips

bgates1654

You have mail I will get a vid of hte exhaust and the sounds tomorrow hopefully.

hct67

iTrader: (1)

Appreciate it, I sent you an email back. I also wrote warpspeed performance and asked them a few questions abouta catback system , so opefully they will email me back with a few ideas. Once again thanks for your help!!!!!

hct67

iTrader: (1)

Bryan, What do you think about this? I was searching like crazy and well found the Greddy EVO for a decent price. Heres the link, let me know what you think?

http://www.adventon.com/acb/showdetl...10082&CATID=23

bgates1654

HCT667 that is not a decent price. If you look at the OBX H-type exhaust its basically the same thing since its a greddy knockoff. I have no doubt that they sound and perform similar if not the same. I picked up my OBX catback for 273 shipped out of a group deal. You can find them on ebay if you look under "catback maxima" and you can get them even cheaper or if you are desperate you can get it easy by bidding up to 300 shipped I am sure.

I have got the pics in the digicam ready but I need to find the USB cord. The camera didnt have a sound option so I wont be able to help you out with the sound unless someone can give me an idea for capturing the sound without having to go out and buy another better digicam.

Edit oh yeah Soundmike has hosted the dyno scans for me and here they are:
http://www.nissanx.net/gall/albun08
Thanks a bunch Soundmike.

Mods, this might be a good thing to keep on the FAQ or make some kind of sticky for dynos/pics/info of mods and ect.

hct67

iTrader: (1)

Thanks alot. I just tried to look for "catback Maxima" on ebay and it came back o results. I have just having a horific time finding anything for the last few days. The sound page that you sent actually made me think about the power tech muffler. I don't know. Maybe I should just take a break for awhile and look again later. Would love to see the pics when you find your USB. Ok, so it is now down to Greddy, OBX , Cattman and Powertech. Those are the 4 that I will decide from with Warpspeed in the back of my mind. I am getting something to eat, maybe that will help with my decision. Once again though, Thanks alot. Really Appreciate it!!!!

hct67

iTrader: (1)

I found it on Ebay, The OBX catback for a buy it now price of $275.00 which isn't to bad. So should I bid on it ofr just buy it, what do you think? The OBX has a nice dep tone to it correct, just want to make sure theres no ricey sound to it.

elchino

Not quite. You have to understand that the ECU does certain things to keep the engine running within specific parameters. In other words: it does things to make your engine run more fuel efficient, more environmentally friendly, and without detonation. It can do this by adjusting timing, air/fuel ratio, idle, blah blah blah.

But there's only so much it can do. If it sees something different over a long period of time it adjusts. However if something is rare (like spraying nitrous for only a few seconds) it won't adjust. But all the adjustments the ECU can make will not be able to compensate for the power a supercharger makes.

bgates1654

Hct67, as for sound it depends on what you consider to be ricey. I think it sounds a bit ricey but I am used to hearing a flowmastered LS1 thumping out a sweet sound. The owners at the place I got my dynos from said it wasnt ricey but tehy are comparing it to civics with fart cans that they have to wear ear protectors for. Everyone else who has the exhaust seems to think that it doesnt sound ricey. The best way I can describe the sound is not loud and sounds great above 2500rpms. From 1500-2500 its got a bit of a droning/rattling sound like say an old 4 or 6 cyl jeep which to me sounds ricey but it is not high pitched like the fart cans. Its got a decent amount of back pressure to it sometimes too much. I notice when I upshift it sometimes gives the back pressure gurgle. My initial reaction to the sound was "RICE!" becuase of the drone but it seemed to settle down and sounds a bit better after a few days. That initial reaction could have been psychosomatic due to my fear of it sounding ricey and not an actual representation of the sound. Thats the best I can describe it. I hope it helps you.

hct67

iTrader: (1)

Well then, I hope this doesn't confuse the hell out of you. Wait before I say anything, I really want to say thank you for your time and everything you have written to me. I don't even know you and you have helped me like I was your best friend. I really appreciate that and I wanted you to know that!! So the exhaust on the maxima is 2 1/4 and the obx is 2 1/2. I have sitting in the back of my mind is just getting either a FlowMaster, Magnaflow or Powertech Muffler.

hct67

iTrader: (1)

That page witgh the sound clips , I have listened to it over and over and well the PowerTech with the rest of the exhaust system being stock sounds the best. I don't know, I am just going crazy here,lol!!

Nissan2k2specV

iTrader: (1)

hey bgates....whats going on with your back bumper, why the lump on top?

exhaust looks good, got any undercar pics or pics when it is clean?

tips for pics...look at my spec v car domain site:
http://www.cardomain.com/member_page...=402599&page=2

id like to see some like that

i ordered mine on the last gd, cant wait to get it.

bgates1654

Ah yes as Nissan2k2specV pointed out I got the pics done and Soundmike hosted them for me. I will see if I can get some under car pics but I didnt think it would be a big deal since people wont really be able to get a good look under your car.
As for my bumper... I have never seen that wave in the bumper before, thanks for pointing that out, but I will tell you some things I have seen. If the trunk is opened It can be seen in a small spot on the left side where they missed in the paint spray. Odd thing is that the missed area is white rather than black like the rest of the plastic on the Maxima. Also the paint looks wavy like its be spray on an unclean surface or on a surface that isnt very receptive towards paint. None of the other plastic parts on the car shows this characteristic. It is my opinion that the bumper has been replaced with one that was white and resprayed (quickly and none to skillfully) to match my car. This means its either been damaged at the factory or at a dealership.

hct67

iTrader: (1)

Hey this isn't funny, My car is going back to the dealer for the same thing. The rear bumper is fading and the left drivers side quarter panel has blotching in it. It looks like they messed up the paint job somewhere down the line. Also the door handles, one side has the black rubber sealers and the other side is painted. The dealer was mystified about this and is going to have a Nissan Rep come to the dealer and look at it to see if the whole car needs to be re painted. Thats what I asked for, no touch up painting , if it needs to be painted I want the whole car redone to profection. So we will see what happens.

bgates1654

I am going to have it looked into myself. Personally if it is true and it was damaged technically it cant be a new car right? If so that would save me a TON of money seeing as how they would have ot reimburse me the difference between a new car and a used one, i would hope.