Induction parts + ECU reflash dyno results
 

http://i84.photobucket.com/albums/k3...t/370zdyno.jpg

Sorry the image quality is low. I snapped this from my iPhone.

Black line: Stock, but with rear muffler section removed.

Red line: Stillen G3 intakes, Stillen headers, Stillen Cats, Stillen exhaust.

Blue line: Stillen parts + Technosquare ECU reflash + dyno time.

In summary: $3,200 in Stillen parts gave a 26 hp increase over stock to bring it up to 328 compared to the original 302.

$700 for ECU reflash and dyno time ($500 for reflash only) gave an extra 15 whp for a total of 343 whp.

In total, it was nearly $5,000 including installation of the parts to gain 40 whp over stock. The throttle response in now extremely precise. The sound is wonderful, the over-rev to 8100 rpm is phenominal. The "Buzzy" engine vibrations that car magazines have been talking about are no worse above 7500 rpm. If anything, it smooths out a little.

One last thought: Lets pretend I gained 2 hp from removing the stock rear exhaust section. This car would have made 300 hp in this dyno. If the stock engine was 332 crank hp and it made 300 hp on this dyno, that's a conversion factor of 1.1066 for frictional loss (332/300). After mods, this car is making 343 hp on this dyno, which would be roughly 380 hp at the crank (343 x 1.1066). Not bad.

-Phim

Nice gains!

lol... ok two more last thoughs.....

After the ECU reflash, the engine makes more power from 6800 to 8100 than it did at peak before the reflash.

I had Technosquare do the install of all the parts. They charged me $700. Everything was done in one day. The fit and finish on the install is perfect. The guys there are very nice and knowledgeable. Everyone speaks Japanese better than English, but there was no communication barrier.

Nice results. In relative terms (the graph lines to each other) this looks close enough to expected values, and it's a good result. The 300rwhp baseline, even with the mufflers removed, is kinda weird though. Nobody's come close to 300 baseline at wheels on any kind of dyno. Even DynoJets are putting stock cars at what, something around 270-275 most of the time so far? What's the story with that? Is it just yet another setting on the Technosquare dyno?

So please answer me why it went up to 7800 stock on the base line?

I dont have an answer for that. 1) Artifact or 2) the dyno was interpreting the ignition signal wrong. When it was stock, fuel shut off started at 7500 and it was done by 7600.

5k for 30hp... man.. thats pricey.. Im going to pay 10k for a tt kit and make 200hp over stock.. but thats me..:ughdance:

In short, the answer is, yes.

There is a little variability between individual engines, but Nissan has high precision and in the 4 370z's I have driven, I couldnt tell any difference in power output. There is a much larger variability in the dyno's and that debate has raged on for years. I'll leave the absolute hp issue alone. Let's just assume all the 370z's are 332 hp stock. Then let's assume this dyno said it was making 332 whp stock and 380 hp after all the mods. The fraction is the same. The number is wrong because it is overly optimistic, but it's useful as a benchmark to tell what your modifications are doing.

I totally agree on turbos being a better solution. I talked to Altered Atmosphere about doing TT but I'm in Cali and smog laws are strict. If you don't pass visual inspection and tail pipe emissions, your car will be off the road. AA said it would cost $3k to convert the car back to stock when it came time for emissions testing. Total cost for turbo's, shipping and reconversion to stock would be $15,000 that I would eat in depreciation. At that price point, I might as well get a used Corvette z06.

My endpoint with this car is to get a centrifugal supercharger for it but no one has them for sale yet. The other mods like headers and cats will tie in nicely with the supercharger when they come out.


PS. it was 41 hp gain at wheels... which would be nearly 50 at the engine.

5k for 40 to the wheels not BHP is actually not that bad at all!!!

Also, i would like to add I ran on a DynoJet 7 times stock and my last 3 runs were IDENTICAL 282whp and 241wtq...Do I have a special Z? Not at all!

Really, I dont care if this dyno said you had 350whp, I'm just interested in the before and after gains that seem to be fairly consistant for the mods you have and other members across different dynos!

I'll be going back to the dyno this week to see what my difference's are! I'll be happy with 20-30more whp...

I would hate living in California!!!

I think the gains are great. Congrats and thanks for the testing. It really helps the rest of us out.

whats the diff between a reflash and a tune? The only reassuring thing to me on looking at these graphs is that the reflash helps with low end torque loss with these parts.

I dont know IMO it seems like a lot as well.
Forced induction guys I think are a little spoiled to begin with especially the EVO's guys who can make lots of power for cheap.....us Subbie guys have to spend a little more (FTL).
Either way dyno's are cool and all but lots of factors play into it(high reading- low reading- correction factor etc.) Good to see base-line and additonal power but when it comes to the way the power is delivered it is literally about driving the car and how and where the new found power is.
Nevertheless if the driving characteristics have changed and it [put a **** eatin grin on your face.......then it is money well spent.
I have to agree with Brazilbro if you are going to mod the car and want gob's more power just cut to the quick and throw a snail on that whale.

Good luck with it

We noticed the same thing. The 370Z is so tightly regulated that it nails the peak HP within something crazy like .4hp every time. Insane control. These ECUs are amazing, and we're working to figure it all out.

Reflash is the term for what is being done. You have to flash the memory on the ECU.

You're talking about the difference between a Base Tune, and a Dyno Tune. A Base Tune is an off the shelf tune that was done on some other car on a dyno. If your car isn't exactly that car, then your gains will not be the same. A Dyno Tune is your car specifically being tuned.