motordyne M370 mainfold installed and dyno tested
 

You guys want results, and I haven't had any coffee or food all day, so let's just cut right to it:

Install:
Takes about 1-2 hours, very simple, as expected.

The testing:

We did ONE baseline run before the install, which pretty much matched my previous runs when I got UpRev tuned at the same shop a few months back. We left the car on the dyno strapped down and installed the new manifold. We did 2 runs and then let the car cool down and did a final run, all runs we're datalogged using uprev to ensure things we're still in check. I've attached a dyno sheet comparing the baseline with the last run.

In the end, most people care about torque, and rightly so. There was a gain of about 8 peak tq, with similar gains throughout the midrange, but it just wasn't as good of results as Tony was seeing with the stock car he tested.

There was no average of 3 before or 3 after runs. I am not a shop owner and $125 in rebates for a dyno does not go a long way as I am sure most of you can imagine. I did call Tony after getting the results, and he offered to pay to have the stock manifold put back on and tested more, which was very cool but this was around 2:30 and they already had other cars to work on and I couldn't really stick around much longer.

With more runs and extensive testing, you might get better average #'s, but after seeing the car before and after, the loss of power/torque is there near redline, and it's not going to change with more pulls. Perhaps this is only apparent when mods/tuning are in the picture, I don't know as I am the only person with full bolt ons and uprev to have tested this thus far.

I emailed some raw numbers to Tony at motordyne so hopefully he can use that to get some average delta gains.

For those that care about the peak numbers: -9hp/+8tq

Driving impressions:
It's too early to tell much, I got to stretch its legs briefly and the low/midrange pull definitely felt good, better, nothing drastic but I did notice it.

I may have gotten the car up to about 120 (shush) in 4th near redline and the one thing I did notice was that it didn't feel like reaching the rev limiter. It felt more difficult to get it to redline, it just wasn't as easy as it was previously, 7300-7600 felt like it lasted a few seconds, where it should have been ready to go into 5th, that really surprised me, and kind of bothers me. Maybe it's not a big deal, you don't hang out around redline often, and you can just shift a bit earlier, but it still bothers me...

Would I buy it again:
I'm not 100% sure yet, the mid range numbers look good on paper, and seem noticeable but at $720 shipped its a hard pill to swallow to see such a large drop off in the last ~500 RPM's, which lets face it, we can visit often with this car, it was meant to be taken to redline. I need to do more butt dyno testing to really be sure.

Lastly, I would like to thank the guys over at Performance Motorsport, they new I was testing the motordyne manifold and worked out a deal with me so in the end (when I get the refund from Motordyne) I won't have paid for the dyno/install out of pocket, really great guys over there and they know their Nissans.

thanks for the info!!..im sure it'll help us all make a more informed decision..

Nice - thanks for posting your results man - takes a lot to be brave enough to test the waters for us Z owners. Let us know what your long term impressions are.

maybe you need a retune to pull more out of it?

Man that a/f looks all crazy.....

^^ didnt even look at that....i think retune is definatley in order

They tried looking to see if they could tweak anything but theres nothing else can they can change. Yeah the a/f looks crazy but its fine, it's just not averaged to give you that flat line we're used to seeing, no clue why they didn't.

What was the A/F readings. did they change.
My car has full bolt ons, I will have the manifold early next week.
My red line is 8100 rpm and my hp starts dropping of at 7300 rpm.

Z

i would e-mail uprev and have them send you a tune, they have done this with me in the past...or go to another tuner...the AF ratio should "try" to be as consistent as possible all through redline, thats just way to erratic. and it shouldnt in the 14af at WOT, you need new targets for the car to hit

I dunno, but those are some nice gains under the curve. Definitely more gained than lost!

I appreciate the concern, the afr is fine, it's erratic because its not averaged, and it's in the 13's at wot. the shop that tuned my car has been tuning Z's for years with UpRev.

agreed, I hope more driving reinforces this.

Do you think the new M370 mainfold is making the car run leaner? I see the avg AF at 14 and min at 13.2. 13.2 AF should be perfect for NA car at WOT.

I actually did some basic analysis on your dyno graph, and there is definitely more area under the "after" curve from 5100+ rpm than the "before" curve. About 0.7% more power overall. :tup:

there was a weird dip in the afr around 6300 after installing, they fixed that after but it made no gains

yeah and that tq dip at 5100 should resolve itself, they reset the ecu learning points so thats basically the cams not being aggressive enough. it should flatten out again after a few driving sessions.

+1 rep, thanks for posting all that so fast.

Thanks esfourteen for all the information and time you put into this. Now go get something to eat and enjoy your Z!

I think since ur the most modded so fsr and tuned. Tony should pay u to just go redyno next week after youve driven it for a while. See any diff

How many pre and post dyno runs did you do today?

Id like to see tonys opinion on this, but I'm wondering if you would see gains if you had the stock intake installed. I could have sworn I read an article where a 350 saw gains switch when it swapped back to stock intakes while running MD's art pipes and exhaust. Granted, I don't recall what kind of intake it was running, maybe it was just a bad design on that car.

Thanks for the dyno sheets, numbers, and the super fast install/dyno time.

interesting..

I would have preferred to see more same day pre/post dyno pulls to equilibrium to be sure.

One baseline run may indeed be valid but it would be better with more runs showing repeatability. When you are assured of repeatability you are assured of the pre/post accuracy.

Note: If anybody does same day pre/post dyno testing of any part, weather the numbers are moving up or down, dyno each condition until it no longer moves and then get your three runs for each pre/post condition. This will give the most confident test results.

This is the way I do all my dyno testing.

Those are great results IMO... That top end Power can be easily fixed by a simple retune on an actuall dyno not preprogramed maps inserted in with Osirs.

My personal opinion is that car is running pretty lean approaching redline because of more airflow (plenum) and not getting enough fuel to make the power that it can..

Nick,

Let me know if you would like to do this.^
If there is any kind of change or adjustment over time, at least we will know if it does.

Tony

I would have no problem re-testing it if you want to cover the costs. ;)

Dude Tony is awesome. : ) I was jsut throwin that out there.

I'll call you Monday and we can work out some details, I have no problem do any additional testing with more dyno runs.

Yes. Lets do it.
Just drive in and dyno the same way as when you drove in today.

Capture all data on a email or flash drive and also get several of your previous baselines to compare to.

I know this is less than ideal but more data is always better. Maybe something can be learned from it.

+1 one rep to Tony and Nick

Yeah, Tony is really stepping it up. He is giving Motordyne a great presence on the forums in a short amount of time.

Another +1 from me.

Thanks guys!

My objective is to make a complete line of NA bolt ons. Each of which is to be the best in its class. A little time and we will get there.

^atleast your starting early for the HRs compared to DEs. You should be okay in couple of years. :D

I plan to do it faster than that. ;)

I plan to do some further testing with nick on Sunday. Our cars were identical in speed if not me a touch quicket a few weeks back. Gonna go to the " local track " and see if it's any different this Sunday or monday.

I thought the loss at the top end was expected as the runners changed to give more mid range? So should the longer runners give gains from start to finish or just in the mid range where we lack a bit?

Tony backs up everything he produces out to the market, also has outstanding customer care. Good job Motordyne!!!!

Can’t wait for the Art Pipes and Exhaust!!!

On the data Tony provided there was no loss at the top end, it sort of leveled out with stock, the gains were expected from 3-6k give or take. I think I'm noticing the loss up top because my car was making more power than stock. I'm not all that surprised about it since it's somewhat expected when lengthening the runners. I was just hoping it wasn't the case since it didn't seem to happen on a stock car in Tony's testing.

Well then they should know with these cars 13:1 air fuel ratio is not the magic number on these motors as I've seen time after time with multiple tuned VHRs. They like the extra fuel, most power that was made for me was 12.4 - 12.5. I made 16whp+ over baseline on a 85 degree day with 60% humidity with a good amount of heatsoak.

Which is why independent dynos are always good to have. Top end loss isnt too bad with mid range gain but it would be nice to keep what you have and then gain too.