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Discussion Starter #1
So I finally took the plunge and did a dyno pull to see how much horsepower the J35 puts out.

Mods:
J32A3 Block and pistons
J35 Crank and Connecting Rods
TL-S cams
Jpipe and PCDs
Fujitia CAI
AEM FIC

I am a little disappointed at the numbers I have to say, but they are only numbers.

Anyways, the pulls were done on a dyno dynamics dyno. I heard they call these the heart breaker dyno's as they typically show way lower numbers. And at 3000ft above sea level.

Here are the graphs:


HP with AFR



HP with Torque



And the Torque numbers,

Kinda nice that its over 200 from 2800-6100 rpm.


I really wish I had done a base pull prior to doing the build but oh well what can you do!
 

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^ his a mile and a half up so I am not surprised.
 

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Discussion Starter #5
that seems low...there are ppl with j30's with only bolt on's making those numbers
It is what it is, and it turns out I am closer to 3500ft above sea level. Conservatively, I experience at least a 10% loss in hp due to the high elevation.

And from what I have been able to gather, the dyno dynamics dyno typically shows a 10-20% decrease over a dynojet.

So just for hells sake, lets go with a 10% difference to a dynojet
so 236.6x1.10= 260
and another 10% for the altitude
260 x 1.10 = 286

But like I said it is what it is, and I am not chasing HP figures, I am happy with the power curve and that everything works great.
 

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Bobby Lane Racing
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do you have numbers of before the tune and after the tune? Whos tuning the FIC? Also those numbers are not right. a 3.5 liter should be making alot more torque than that. The dyno should be calibrated for whatever environment and condition its located in.
 

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Discussion Starter #7
do you have numbers of before the tune and after the tune? Whos tuning the FIC? Also those numbers are not right. a 3.5 liter should be making alot more torque than that. The dyno should be calibrated for whatever environment and condition its located in.
No numbers before, I really wish I would have got a baseline on the stock motor. The primary focus of tuning the FIC was so that the cel code wouldn't come up. I am running on 91 octane gas. The AFR in the photo seems a little off, but that could be because it was taken at the muffler and not closer. I really need to invest in wideband sensor to get it properly tuned. At idle and under normal load it was at 14.8.

As far as the torque numbers, yeah I have no idea, not sure if rims etc would have any bearing on a dyno. I am running heavy 18's about 50 lbs a piece. Also I do have a torque dampener don't know if that would contribute to the numbers as well, I know though that I can spin through 1st 2nd 3rd and into 4th if I hammer it down without TC. So I don't know if that might have thrown the numbers of a bit? As far as the dyno being calibrated properly I would assume it is, but I was unaware that you can calibrate it for altitude?
 

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Bobby Lane Racing
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Yeah who knows, it's all a guess on here. It just sucks cause I've tuned plenty of J30a4's making more power than what you're showing. I could see a 15-20hp difference due to conditions and environment, but that's a big gap.
 

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Discussion Starter #9
Yeah who knows, it's all a guess on here. It just sucks cause I've tuned plenty of J30a4's making more power than what you're showing. I could see a 15-20hp difference due to conditions and environment, but that's a big gap.
I hear you I was disappointed as well when the numbers came back. And from the the other dyno pulls i've seen on here I was expecting quite a bit more. Mind you I think where you are located you are a little closer to sea level then me :).

I mean using this calculator
Wallace Racing - Braking HP Loss at Altitude Calculator
If the car made 240hp at sea level then according to the math, it would lose approximately 25 hp at my altitude.

But I guess the nice thing is, that it kept making power all the way up to 6500 rpm, and it was pretty smooth with no bumps or spikes.

I know paul said he did a base on the same kind of dyno as this one and he was really disappointed with the numbers. I also talked to the guys doing the dyno and they were impressed with the numbers and torque so I duno? Said they dyno'd an auto TL and it only put out 170hp but who knows.

EDIT: I found pauls post and he said he dyno'ed 179 bone stock. Not sure about his altitude etc but 179 bone stock to 236.6 is about a 60hp increase.
 

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Slammed & Stunning
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Wow I feel disappointed for you.........
Anyways I never knew that altitude factored horsepower.. but I can now see why..
Anyways try another dyno my man..
Those numbers are way too low
GL
 

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Discussion Starter #13 (Edited)
Yeah I never knew altitude played such a big deal but it makes sense considering air is less dense at higher altitudes. I know that turbo and sc cars are less effected thought.

But consider this, I ran against a amg 63 twin turbo benz on the quarter, and the guy on slicks only trapped a 13.5, I'd have to see the slip, but I know Cubano traps quicker then that.

Nah, the numbers aren't what is 100 percent important. I was just curious.

Bore is 89 on the tl block and 93 stroke using the mdx parts. I would love to know the CR as well, I have no idea what the deck height is etc. I would think its in the 11s as the stock TL motor is 11:1.
 

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I got 237 w/ a v3 j-pipe at sea level. That sucks the dyno read so low for real.
Well 237 with just a Jpipe is high. Also, it's hard to compare dynos across the country as there are almost infinite variables. I must say...50lb wheels?! :eek: Is that without tires? If so, those are the heaviest wheels ive ever heard of minus 20"+. if so, that definitely has a large impact on your numbers. I'd attribute at least 10hp to your wheels.chit that would make your wheel/tire combo 70+lbs which really doesn't make much sense. Have you ever been to the track?
 

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Discussion Starter #17
Well 237 with just a Jpipe is high. Also, it's hard to compare dynos across the country as there are almost infinite variables. I must say...50lb wheels?! :eek: Is that without tires? If so, those are the heaviest wheels ive ever heard of minus 20"+. if so, that definitely has a large impact on your numbers. I'd attribute at least 10hp to your wheels.chit that would make your wheel/tire combo 70+lbs which really doesn't make much sense. Have you ever been to the track?

It's 50 lbs with tire and rim, my bad. I have 18inch Axis decade rims, I think they run about 25 lbs a rim, and the pirellis run about 24lbs a piece. So it definitely isn't the lightest combo around.

From the discussion going on here, yes the dyno's have a huge difference between them. I know some place even calibrate them so you have a little better run to keep everyone happy and especially you happy. The guy I went to is a no kinda **** type of person, and wouldn't give a rats ass if you were disappointed with your numbers. There is another guy in town with a dynojet so if I was really interested in chasing numbers I would go to him.

Yes I have taken the car to the track.. it was my first time and I was a complete noob at it so I launched with traction control. My fastest of the night was 14.25 @ 97mph I believe, I'd have to check my slip.

In the summer I might be heading to the west coast, and if I do, then I might try to dyno again at sea level and see what kind of difference it makes!
 

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Anybody who has ever dyno'd their car knows exactly how you feel OP.

My 3.5L has been on the dyno four times now, each time ending with some sort of disappointment.

Don't let it get you down, just keep pushing to find out what is bottle-necking your setup and address it. It gets better every time :)
 

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TrakCord
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ouch those numbers hurt, but ye numbers r just that only numbers, you need to take a trip to miami and dyno on a dynojet then you'll feel better :up:
 
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