This is my 1st Thread! Anyway, I thought it would be useful to post my new dyno results. The guys at the place where I got it performed allowed me to do numerous runs. These were the best I had. I'm sure there are going to be numerous skeptics, even with proven dyno tests. Nevertheless, here's what I found out. I first got it tested before the addition of the Custom Enterprise Y-pipe. The first test shows what my front wheel horsepower was before installation and after my first two engine enhancing mods, the Greddy Exhaust and the Injen Cold Air Intake. As you can see, my runs before the the y-pipe install show a front wheel horsepower of 212 HP. Now if the other calculations are correct regarding the loss of horsepower from the crank, which I guess would be conservatively 25%, then I already had an approximate 10 to 14 horsepower gain from the Exhaust and Intake alone. For example 265 Crank HP x 25% loss = 198 Front WHEEL HP Stock...
After the 1st dyno runs, I acheived the 212 which seems about right.
So, there does appear to be a noticeable gain with just those two mods. I'm sure others will challenge those numbers, etc...A stock dyno with Auto would absolutely answer the issue, but I don't know of one.

After the install of the Y-pipe, we waited about 30 minutes in hopes that the ECU would recognize the install. We dyno tested at that point and my heart about went through the floor. There was a loss of 2 HP. I just about started freaking out, but the mechanic who is very knowledgable regarding HP said let's give it a few and see if it recognizes it then. About another 30 minutes went by and the next several runs were very pleasing. I hit 220 HP on several consecutive runs with the best being shown below. There was also a 19 lb increase in torque. So there appears to be a definite additional gain with the CE pipe of at least 8HP. The CE pipe seemed to also help smooth out my A/F ratio, but admittedly, I'm still running rich down low and lean up high. I'm not going to debate about these numbers and argue with the experts, but I think there are noticeable gains with these mods. No, they aren't as advertised and as significant without an ECU upgrade or the SAFCII which Maxmale has and I think has proven performance with it as well. However, even with the stock ECU there are obvious gains in sound, torque and horsepower. Also, sorry for the quality of pics of my dyno sheet, but I didn't get the downloadable file. WARNING: THESE RESULTS ARE NOT FAKE......LOL. PEACE OUT and do with it what you want, I'm happy with the outcome no matter what anyone says, this shi* works! PEACE OUT

 

Very sweet, except I thought I had read in one thread that stock HP was about 208-212. Of course that would have to mean the Greddy and CIA got you nothing, which is a little hard to believe. Anyway very cool!

 

stock is 193hp or so.. the % is actually 27% loss not 25%...

 

Damn... 27%. That makes Baby Jesus cry... that's RWD drivetrain loss right there...

 

I may have been mistaken..... 193 sure feels fast, but is definitely a far cry from the advertised "265hp"

 

I know it... from the get go our numbers never seemed right..

 

With a true 265hp I would smoke my wifes 2002 Mustang GT.....You know even with 220hp I might be able to pull it off. It is usually pretty close anyway.

Maxdizzle's post provided some real good info.

 

'04 Maximas have the 5spd auto right? What gear do you dyno in with that trans?

 

from this photo. your a/f ratio looks about right on with mine. i see about a 15hp gain with an afc and proper tuning. which it seems as though you know the guy that does the dyno's so maybe he'll hook you up with a tuning session.

 

i completely believe these dyno's they were almost identical to mine. your torque is higher than mine though. which probably has to do with the CAI. i just have a custom made ram air. i feel fairly certain that if you get the safc II, and proper tuning on a cool day you will see high 230's

 

If 'Niq's HP calculations are correct, then I gained even more HP with the Exhaust and Intake alone. That makes me appreciate them even more!

Quote: '04 Maximas have the 5spd auto right? What gear do you dyno in with that trans?

I've got the Auto 5 speed. The pulls are what you would call 3rd gear pulls. Tried 2nd but didn't work as well.

What also impressed me about the Y-pipe was the extra torque you get. People say we just "imagine" gains, the dyno proves it in my opinion. No, they are not incredible gains, but let me assure you, they are definitely felt and provide a SERIOUS RUSH!! I finally found out where the closest 1/4 mile track is, so I'm considering heading there this Saturday....PEACE OUT

 

Thanks for that info Maxmale! I was curious about what your A/F ratio was because I was somewhat lean toward the end. Yeah, you saw a great gain off the SAFCII! I'm seriously considering that as my next mod! If we just had some headers. This stuff is addictive!!!!!!

 

Third Gear? I've always know that you should dyno in whatever gear has the 1:1 ratio. From what info I've found, the 5at transmission's 5th gear is it's 1.02:1 ratio which would mean the car should be dynoed in 5th gear. Correct? I got the gear ratio info from this site http://nissan.jbcarpages.com/Maxima/2004/index3.php
Is it different for these cars/transmissions for some reason why you shouldn't dyno in the 1:1 ratio gear?

 

There must be significant differences in the mapping between Maxima and Altimas as mine goes the other way which was the problem with 5.5 gens also . In respect to A/F ratio.

 

Yeah, I'm not the expert, so I really didn't question what the mechanical experts were doing. We discussed it and 3rd was the lucky number. Also, like I mentioned earlier, they let me have several runs so we were able to try a couple different things. Obviously, it was done correctly because my numbers are almost identical to Maxmale's old numbers and to Warren's (aka Ramberg's) current numbers. He has an Auto too, but he's got the underdrive pulley which gave him a couple more HP. Nevertheless, it was fun to dyno the ride! I really wish that someone who is considering engine enhancing mods would do a stock dyno before they put the new mods on. That way we can have an accurate baseline number.....PEACE.........

 

An excellant idea...

 

Hey, bonus time is around the corner and the guys at the dyno shop can only cut me so much slack.

I was thinking of this mod
Click here to see Video

 

man, i couldn't agree more.

 

Hey Savagecat, that's a sweet video! Pretty funny, but I do think it shows another important aspect of dyno testing, the air intake. The guys that did my dyno discussed the fact that my numbers would most likely be higher if I was running in open air. The air blower they had was not really able to get into the compartment where the Injen CAI was located. They said that in an outdoor run, air would be able to enter that area better because of the openings under the vehicle which are close to the intake compartment. So, I think the leaf blower video shows that just with more air, the HP increases are even more noticeable. I think that running the Max early on a cold morning in late Fall or early Winter, the gains will really be unreal! I would recommend the mods I've gotten to most Max owners, especially those that are into speed and performance and are considering engine mods. I'm really curious to know what my 1/4 mile times will be. We'll see.....PEACE OUT

 

Very good numbers. My numbers were about the same when I had my dyno done in Fl. last month. It was like 102 degrees in the shop. Keep up the good work buddy.

 

Thanks Warren! I'm still on a little high from the Dyno yesterday....By the way, thanks for recommending the Y-pipe Warren. You responding to my message on your guestbook and telling me that it was definitely worth it made me go get it! Yeah, I'll bet your numbers will be even more impressive with some cooler air, especially since you have the pulley too! PEACE.....

 

Why would 'waiting' do anything? I'd say more driving would do more, but even then ...
Your wires are crossed here.

Do you have the run files?

Is this on an auto (5AT), I figure it is since the runs don't go far past 6k .. why did they not go to 6.5k?

That's what SAE correction factor is for.

 

Thank you for that information.

 

Yeah, I don't know Dyno Queen? I'm not the expert, so I really can't explain why it performs the way that it does and like I said earlier it's an Auto with the SHIFT. Read the thread post, I said I don't have the downloadable file. I chose not to get it because you have to allegedly buy a program to run it. I knew that the printout was enough for me and you can see the sheet for yourself, it shows the A/F ratio. Unfortunately, I don't know how to accurately explain it, but obviously, it's not leveled out the way it could be. Also, we waited 30 minutes after installing it because we ran it real quick to see if I could feel a difference and YES, I could! It's starting to feel pretty FAST! I think with some headers and the SAFCII or chip upgrade, 6th Gens could be looking at near 240 HP+! PEACE OUT..........

 

I know it's Me neither (no expert) ... Just taking advantage of my donation privelegdes.

It's a FREE download www.dynojet.com

Your A/F is lean down low/midrange and rich up top (typical of stock tuning)

That's a strange spike in hp @ ~4.5k (before anyone says 'it's VIAS', it's not .. that happens @ 3.8k) ... It be nice to see ehat kind of power after 6k ..

Those are about the #'s I put down with headers and GAB (4AT) albeit less torque. ...

 

I wish I would have known that the program was free before, I would have gone ahead and gotten the files. Thanks for that info on the A/F ratio and the program. Yeah, after 6K would be interesting, I think there is some untapped power there. The spike, I'm not sure, I think he said it could be the transmission or something. You can't feel anything different other than maybe kind of a boost when everything kicks in! PEACE OUT...

 

Some shops keep your file on record, so maybe try calling him/them for the files...

Power production after 6k is a matter of A/F tuning + capable intake manifold design, those seem to be the 2 bottlenecks of the FWD VQ35.

 

[QUOTE=NmexMAX]

It's a FREE download www.dynojet.com

I just downloaded the program and when I get my next dyno, I know to ask for the run files. My friend is so busy in Florida that he can't go get me the run files.

 

[QUOTE=ramberg]Why don't you just have them email them to you?

 

I would be lucky if they knew how tocopy it to a disk. I called a couple of times and my friend called alsoand they keep saying to call back because the guy is not there. I will get it the next time I do a dyno which hopefully will be in a couple of weeks.

 

What have you added since the last dyno?

 

Nothing yet. I just to do it in cooler weather.

 

By the way I might be driving down to Albuquerque early next year to see my cousin.

 

my stock dyno pull on my 04 was 218-219whp which was 3 runs after the 2 pulls i made with just the berk intake which then gave me 221whp and 232Tq , brian Min at berk has a copy of my dyno sheets. i also have them on video as well.

 

is your car a 6spd? my 02 with a y and intake did 218whp/228Tq. you 04+ guys are getting some nice TQ #'s!

Maxdizzle1..did you dyno on those 20s? if so that would explain a loss in power

 

But you're going to hate the elevation here ... DA's suck, and uncorrected #'s are

 

I called the guy at the shop and they're suppose to email the runfiles. Will I ever get them is a different question.

Yeah, I did the dyno with the 20's and the guy said that it really wouldn't make too much of a difference.

I think the 218 HP stock is very strange. That would make almost an unbelievably low drivetrain loss, 18% or less? It's definitely possible but I wonder if they are SAE corrected and is it a manual and was it in the middle of winter. Also, it seems strange that both dynos I've seen from COMPANIES start and finish with bigger HP numbers. The custom enterprise dyno says his stock was 222 and Berk says yours was 218-219. Maybe they have better dynos.

Also, like I mentioned earlier the air was not able to get into the intake area which is somewhat hidden with the Injen intake because the dyno fan they had was not blowing any real air under the car which is where the openings are. This I think made a huge difference. Also, that leaf blower video (as funny as it is) shows you that the air intake and availability is very significant. The berk intake is up on top of the engine and with the dyno fan going the air intake with the hood up would be ideal.

Regardless, there are numerous factors which play into a perfect dyno run. I think my numbers are legit and in line with at least 2 other guys on here (Maxmale and Ramberg). I also think there are significant torque gains as shown by my dyno. Maybe I'm just imagining things, but I feel a huge difference since the addition of my mods. PEACE OUT.....

 

Drivetrain loss is calculated by taking the whp/(1- drivetrain loss %). That means if your car makes 200whp and has a 15% drivetrain loss = 200/.85 = 235hp at the flywheel.

5AT G35's have a calculated drivetrain loss of ~20%. A FWD 5AT should have a lower drivetrain loss than a RWD car because it doesn't have to spin a 2'-3' driveshaft. I'd imagine the Maxima's 5AT drivetrain losses should be in the 18% range or so. So if you made 212whp, your flywheel HP is closer to 259hp.

What?!?! That's less than what the car is rated at!!!!!!! How can this be? It's those freaking 20s!!!!!!! That cat at the dyno is smoking crack if he doesn't think those boat anchors aren't sucking whp from your car. The 20" wheels are working against you in three ways:

1) Weight. The overall combo has to weigh at least a few pounds more than stock. I'd venture to say 5-7lbs at least.

2) Rotational inertia. Pushing the weight of the wheel/tire further from the hub require more energy to accelerate the combo. Increasing diameter by 2" is very significant.

3) Wider tires. I'd venture to say your tires are probably 1"-1.5" wider than stock. That's increase rolling resistance.

I wouldn't be surprised if your car is loosing about 10whp simply from the 20" rims.

In the end, if your car was on the stock 18s and running the mods you have, it would probably be pushing a legit 280hp at the flywheel.

 

With a weight of 3500lbs. (w/ driver) and a trap speed of 75mph (1/8 mile) calculates to 200whp. With 18% loss that 244 crank hp and with 20% loss that 250 crank hp. Any more than 20% loss to the wheels sounds crazy, but I'll be quick to say I'm not a Maxima expert. I would think that it would be more likely that Nissan overrated the Maximas a little than them having 25-27% loss.

 

Maybe you are correct regarding the 20 inch wheels? I'm not going to argue with guys that claim to be experts. But that still doesn't explain Maxmale and Ramberg's numbers. Both of those guys have smaller wheels than 20's. I'm pretty sure Warren aka Ramberg has 18 inch wheels and his numbers were a couple HP more than mine, but he had the pulley too in addition to the same stuff I have, and Maxmale has 19's, I think. I think I read where Thug got 219 HP and he ran it with the factory wheels, I think, and he had some mods on there, I'm pretty sure. Again, I think it's a combination of factors during the dyno, with one of the most significant being the air intake into the vehicle. Also, we never heard a response from the guy with the 218 stock numbers, were they SAE corrected, was it in the winter, was it a stick which would allow more use of the RPM's, etc....? Non SAE corrected numbers are higher. Anyway, I also think there is something to the ECU argument, maybe, if his stock numbers are correct. Tek-Niq corrected me and said the loss before it got to the wheels was actually 27% which is almost 10% more than your estimation. I guess there are just going to be questions out there until a true expert in 6th Gen Maximas comes forward with some explanations. I can't figure it out, I definitely wish I could. All I know is that it seems faster all around. PEACE OUT......