NISMO Uprev tune no gain?
 

Hi all,

I bought a used stock 14 pearl white NISMO with 11k miles a couple of weeks ago.

One of the first things I did was get an Uprev tune done on it as I thought it would make the throttle feel livelier at lower rpms and increase the WHP a bit (10-15 whp throughout the powerband).

To my disappointment, the whp mainly increased above 7500 rpm because the redline was raised to 8k rpm. There is no increase in power at all until about 5000rpm and above from there is maybe 3 to 4 whp increase. Max torque is about 2 ftlb higher, but it says the average is still the same as before 200ftlb.

On another note, I was wondering if the stock dyno numbers 272/206 were even a bit lower than some stock non-NISMO 370z's here on the forum. I have seen about 270 to 280 whp from different members here and NISMO is supposed to have maybe some 15 whp more than regular z.

After tune I have 282/208, probably more like 276/208 because I'm not sure if I want to venture above 7500rpm.

I attached the dyno sheet, tune performed on Mustang dyno.

Am I rightly disappointed or is this normal? Maybe you guys can let me know your thoughts! I would really appreciate it.

By the way, I love the car, just feel like I threw away money for this tune.

I would think you need to add breather mods prior to a tune to see any substantial gains.

NISMO Uprev tune no gain?
 

Mustangs read lower than dynojets. Raising the redline is a bad idea. Also, Nismos have 18 more horsepower at the crank, not 15 more whp. Have your tuner use the throttle map here in the tuning section. Most tuners ignore the throttle tables.

Is it tuned on a stock motor? Typically members have cai,hfc,cbe then tune.

It is completely stock motor. I was in the area in South Florida for only a couple of days and there is a tuner there who is recommended by a few guys here so I just went with the hot headed excited tune on the stock motor after owning the car for 3 days.

If I added an intake like Stillen gen 3, would I need a retune? The tuner said that the Nismos have pretty high flow exhaust, he recommended only test pipes and intakes. I won't get test pipes cause they are a bit too loud.

Plus I just looked around, people have 250 ftlb and I only have 208. Isn't that a big difference on torque even if they used dynojet(higher numbers) and mine was on Mustang(a bit lower numbers)?

Modest gains at best from a tune alone (i.e., with no mods) is typical.

The only numbers that are easily comparable are dynojet to dynojet numbers -- Mustang dyno #'s cannot be easily compared to each other from shop to shop let alone from one to another dynamometer entirely, but those #'s are probably spot on for a stock Nismo and your gains are solid for tune alone.

Yes, if you add breather or exhaust mods, you will benefit from and/or need a new tune.

I have a 14 Nismo. I added an HKS Hi-power exhaust for a notable improvement above 3k all the way up, drove it for several months then added a Nismo R-Tune long tube intake with notable improvement above 5k. I think you jumped the gun on the tune. Until the engine can breathe more freely it will be difficult to make any significant improvements.

If you added nothing by way of aftermarket parts, I am surprised that you gained anything at all. You need something like a CAT-Back, Intake, drop-ins/hard pipes, or some combination of those to get gains from the tune. The throttle map can be tweaked and you can add features like VDC off from the start or map switching to add Valet or Security Mode(s). If I were you, I would contact UPREV and see if they have something that you are interested in before you go back to your local tuner.

Op who did tune your Nismo here is South FL?

Just an FYI we did the first 2015 and to our surprise it needed almost nothing! The car had FI LTH, CBE, gen 3, ported lower, upper and TB's and it barley needed tweeked. The newer the car it seems the less a tuner is needed. The adaptability of nissans Ecu is just amazing with the OEM widebands. We turned off the secondary O2 CELs, richened it up a little from 2-4k and that was it. The car was trying for full timing and running right where my tuner likes the ARF.

Before the tune AND ported parts the car made the same power in 5th gear. Only 4th gear showed the gains. The 15's also have more advanced TB's. Everything nissan does is just amazing OEM with the motor stuff. I would like to see 14 TB's though.

Old

http://i39.photobucket.com/albums/e1...psfxngk0ws.jpg


New

http://i39.photobucket.com/albums/e1...psxe8yrodp.jpg

^^^ That's an interesting design change -- but is it "better" or just "different"?

What about the new design seems improved over the old? Could just be that they're sourcing the components from somewhere else.

Actually, on that note, does this mean you can't mix and match TB's from 2015 to earlier MY's?

Scott, please explain what we are looking at. I assume TB is throttle body but that's obviously not a throttle body...

No Dyno graph eithe,Scott@Synergyr? Come on man :)

BTW you gained 10 WHP and 10 WHTRQ, sound right to me for just a tune and nothing else.

"the redline was raised to 8k rpm."
Please don't raise your redline unless you have replaced your oil pump with the nismo one (doesn't come stock on nismo Zs)
Most cars these days won't get any improvement in anything from the factory. Manufacturers have gotten much better over the years in getting as much power and fuel efficiency as possible.

Can one be purchased? I checked this Nismo site but one was only available for the VQ35. Be nice to have those heads and camshafts also...

Found it! I wonder what pressure it runs...

I believe it's better. Out of the dozens of TB's I've sold, I've had to have at least 3 people take off their TPS housings and swap with the ones I sold them because they were bad. The old TPS housings seem away to sensitive. After a car crash where I get them, shipped to me, shipped to porter, shipped to customer, I think the old ones can break to easy. This new one seems pretty solid inside like its a big metal plate that carries the signal.

So far I'm not sure if you can swap. The 2015 I did got the old TB's and he is having a bouncing idle issue but ever so slightly. I sent his 2015 TB's to be sent out for porting and when we gets his back we'll see if the idle's better. I'm still wondering what a 2014 looks like though.

That's the black housing on the side of the TB. It holds the throttle position sensor inside it and what you're seeing.

Customer has it, I'll get it.


No actually the 10/10 was tuned, parts added and tuned again. The 10/10 was ported parts only in 4th. I have no idea why on his 15 a tune and ported parts got zero in 5th.


Here you go.
The 306 was tuned in 4th, no parts added
The 316 was tuned in 4th, with parts added
The 324 was tuned in 5th, with parts added, just showing 5th shows more power then 4th.
And all in SAE!! In STD and 5th I believe he was 334/285.

http://i39.photobucket.com/albums/e1...psch7wc7jd.jpg

I know I huge PIA and I don't remember but do you make runs with each part added? IE , TB's #'s, Then intake mani #'s, then lower mani? I'm doing a set over the next few weeks, With "your" port G37 Stock VS the M370 this weekend then next weekend( I hope) runs dyno again after adding the ported lower. I was wondering if the TB's are worth it.

No because we know each parts only good for a few hp. Since all 3 are needed for 10hp it pretty much says what you need to do. Again for a solid 10hp at this price point I think its better than most $/hp parts out there at this level.

nismo 370 has extra HP over a regular 370 based on factory tune.......but we are curious as to why an aftermarket tune didn't yield big gains. hmmm. :bowrofl:

also how is scotty still allowed on here under that name after they guy who owns synergy said scott isn't involved with that company anymore?

Hmm. I know a few folks have had mysterious TB failures over the years, so your observation that the new design is stouter/less sensitive is probably spot on. I wonder if there's a TSB mentioning the new design.

it's a n/a engine already turned for premium fuel from the factory, what kind of gains did you expect?

So I'm only going to see a few WHP once I install the ported lower? An with the ported TB's, Upper and lower mani's Ill see a total of 10 WHP ? So with out the TB's(only thing I don't have) Ill see 8 WHP? LOL

I got my tune on an essentially stock Z - R2C intakes were my only mod. I didn't notice any real power gains, and I didn't expect any. I got a very improved throttle response, which is what I wanted. I noticed a bit more low end torque as well.

Also, the nismo oil pump is only slightly stronger than the base model one. Neither can sustain 8K RPMs :eekdance:

Really, never heard anyone having problems at 8k. Only heard them explode at 8.5k+. Anyway there is a host of other issues with higher revs that an improved oil pump will not help with.
1. Poor stock oil pickup for track running - major oiling issues in high g turns
2. VQ37 heads with VVEL run very hot especially at higher RPMs. Hot heads not good. Especially when you run RPMs beyond design spec.

There have been quite a few failures due to running 8k rpm. Raising the redline is playing with fire. It's not worth it to gain a few hp.

It was HP Logic in Royal Palm Beach.

Yeah, I didn't ask for the redline to be raised, they raised it and just told me they did it. At the time, I did not know the consequences of raising the redline could be that serious. They seemed confident about it and we talked about tracking the car too.

I think I will be contacting him to see if he can lower it back to stock redline!

Yep from oil starve and overheating.

Jack @ HP Logic is one of the best tuners in South Florida. He did my FI exhaust install and have seen a lot of his work. Honestly I'm surprised he netted you any gain without any supporting mods. As others have stated in this thread Nissan and other manufacturers have gotten really good at squeezing out performance from all the stock parts.

Also, I believe raising the red line is reasonably safe as long as you're not tracking your car.

That why I went to him, think I got what I could've possibly gained for being stock. But the 8k rpm worried me, I guess there are mixed opinions about raising the redline.