Testing AAM Midpipes with Short Tails and Z1 Intakes.

SS_Firehawk

Sent Also TerribleONE is correct. They were all in 4th.

__________________

James10694

Honestly after I had my LTH cbe and stillen Gen 3 intakes installed and tune I only made 309whp.. Granted I made more torque I still feel 3300 for parts and labor is alot for such small gains.

__________________
Boosted Performance Single Turbo
618whp/489 tq

SS_Firehawk

So I finally added AAM resonated test pipes to the car. I had the car dyno tested after install to determine any power gains. It was a little warmer and more humid today than the last time I had a dyno done, so it may not reflect as well as it could. I asked for a before and after, but yeah... I don't have the DRF's available for this run yet. I'm going back to the shop tomorrow morning because some *** hat didn't tighten the bolts on my H-pipe and now I have a gasket hanging where it connects to my midpipe. The car doesn't sound all that great atm. I'll wait till it's fixed and broken in over the next week or two before I pass judgement. Currently, it sounds like ****. It's like the car developed a sore throat. Anyhow... As far as improvements go. The only dyno plot I have is in STD. I cross referenced it with the best run I had with my last pulls. The results are:

315.68WHP 258.12lbft TQ in STD with 0 smoothing.

My last pull in December was:
314.17WHP 255.34lbft TQ in STD with 0 smoothing.

This is still untuned. AFR's start out a bit lean and then settle into about 12 after 6krpm. The dyno plot looks remarkably smooth for 0 smoothing and being untuned.



So again, minimal gains are showing. I'll know for sure once I can dig a little deeper and get a better idea of what the CF was and the conditions. In SAE, I'm guesstimating about 308-309WHP and 256lbft TQ. I have no clue why I'm not getting the power improvements some other guys get with the same type of mods. I'm not saying my power is bad, it's not that at all, but I was expecting more than a 4-5WHP improvement from just short tails to mid pipes, test pipes, and intakes. Have at it, I'm at a bit of a loss lol.

__________________

Elmo370z

Different dynos read different i guess

SS_Firehawk

Same dyno, different days.

__________________

2011 Nismo#91

I wouldn't worry about it much, dynos are not precision instruments. They can easily vary +-3% day to day. And since were talking mods that only add about 3% at best it's very hard to actually get a consistent measurement. Dynos are in a garage exposed to the elements, they are not kept indoors in a climate controlled environment with a strict maintenance and cleaning regiment.

ajcool2

Seems fine to me. Once you're tuned all of gains you're expecting will show.

__________________
09 Touring 12.33@113mph 338whp

SS_Firehawk

Decided to just Eff it and get a tune. See below for results. This is definitely a big improvement. I converted the numbers into SAE to cross reference the other graphs better. Car is still loud AF, I need to fix that. It really only sounds good balls out or just a small bit of throttle. I'll see how it sounds later on though.

__________________

SS_Firehawk

So, I wanted to come back and revisit my observations. I didn't have much time last night.

1. The short tails made power. I don't know how much, but enough to make a notable difference and affect the gains of the corresponding mods.

2. The Nismo exhaust is very efficient. I did not see it as a restriction point after replacing it with the larger 2.5" AAM exhaust of the same design. There were no gains without tuning.

3. The Z1 intakes did not initially show a power increase, but the curve of the dyno adjust slightly at the top of the power band, indicating the car was breathing better. Again I saw that the stock intakes were not the restriction point to magically increase power

4. The AAM resonated test pipes increased torque by 2-3lbft and 1hp. This is within a margin of error. Again, I did not see a notable increase without tuning.

5. The AFR changes with an intake and exhaust were minimal. The AFR changes with the test pipes were notable until about 3500 rpm. The ECU did a fair job compensating for the changes. The ECU did not see to adjust magically to make power. It richened up the AFR. There is no flat spot above 6500 rpm, noting that that restriction no longer exists. Tuning on average made 9whp and 9lbft across the entire power band.

6. Tuning unlocked 12whp and 12lbft of tq. It wasn't until after tuning that power from the mods were showing. The AFR's were adjusted to around 13, fine for NA.

For reference, I added another dyno graph of a later pull on the same day as the tuning with identical conditions. The results are in STD.

__________________

VDesi07

If I'm ever in the Tampa area again visiting Z Fever would love to see the car!

__________________

SS_Firehawk

Yeah... I'm adding some Vibrant 12" resonators to the short tails. Too loud, too unrefined, and juvenile. Anyways, pics of the current exhaust setup. Those same resonators on the midpipe, I want to add to the short tails.

__________________

Elmo370z

Thanks to ssfirehawk, he compared our dyno runs. Im in the blue and he is in the red. I have basic bolts ons with an uprev tune (fi long tubes, fi cbe, stillen g 3s) my oil cooler was to efficient, it wasnt until the 3 or 4 pull that i broke into 330whp range.

Attached Images

20160228_022020.jpg (805.0 KB, 30 views)

SS_Firehawk

I got you covered Here are some linked images. I found it interesting to compare our dyno pulls with them being from the same tuner and dyno. The conditions were within 4 degrees, humidity and temp was lower on Elmo's run than mine (18% vs 38% & 75 vs 79). The headers start showing their flow advantage half way through the pull gaining almost 10whp in some spots and holds that power advantage to redline.

__________________

Elmo370z

Ahhh way better

ZeroZeta

I have a similar set up now mid pipe + short tails, injen CAI and will be adding Berk HFCs and Z1 Intake plenum before going for a tune/dyno.

From everything I have gathered Firehawk's results are inline for a Nismo. The Nismo does not benefit as much as a base from the mid-pipe and the largest gains posted on AAM's site are for a base. Which benefits more by getting the H-Pipe that the Nismo already has, and larger diameter piping.