EcuTek Tuned Quickly wagging tail out?

[jacksonmagnet]

I'm good, thanks. I've been dyno-tuning cars for 25 years, along with street and remote tuning my fair share of cars for both myself and others across multiple platforms.

lol

 

[KrackaC8]

Well personally I really like the upgrades you have listed on your car. It must handle and sound great. Is your 23 considered the prototype model? I don’t know much about that yellow prototype and I didn’t see the bronze Rays on yours so I wasn’t sure. How many were made? I like the contrast between the black top with that color looks excellent.

Thanks! This is not a Proto Spec, but actually was one of the first off the assembly line in spring of 2022 (VIN 187). Nissan retained it in their manufacturer fleet for car shows, photo shoots, education, etc. until fall 2025. I've had it for about a year now once they released it; picked it up with 549 miles on it. It never saw a Nissan dealership and actually doesn't even have a window sticker. The factory warranty clock didn't start ticking until I got it either, which is cool! Same goes for all the various free trials that come with a new car purchase.

 

[RHE2026]

Thanks! This is not a Proto Spec, but actually was one of the first off the assembly line in spring of 2022 (VIN 187). Nissan retained it in their manufacturer fleet for car shows, photo shoots, education, etc. until fall 2025. I've had it for about a year now once they released it; picked it up with 549 miles on it. It never saw a Nissan dealership and actually doesn't even have a window sticker. The factory warranty clock didn't start ticking until I got it either, which is cool! Same goes for all the various free trials that come with a new car purchase.

That’s actually very cool that it’s never had a dealership window sticker in it and the car is very unique because that is a history background that not all 2023 Z’s saw. Plus you own a new Z that came off the assembly line in 22 and purchased it in 25. That’s rare, nice find. How did you even get to hear of it coming available years later? What makes the prototype any different than the bronze Rays on it? That’s my last question for you for now. Thx

 

[KrackaC8]

That’s actually very cool that it’s never had a dealership window sticker in it and the car is very unique because that is a history background that not all 2023 Z’s saw. Plus you own a new Z that came off the assembly line in 22 and purchased it in 25. That’s rare, nice find. How did you even get to hear of it coming available years later? What makes the prototype any different than the bronze Rays on it? That’s my last question for you for now. Thx

Nissan USA released a large batch of 2023-2024 manufacturer fleet vehicles to auction. Everything from this car, demos, employee company cars, press testers, etc. I got lucky and was able to snag it from Milwaukee and had it transported down to Texas (where we lived at the time). They all originated from Tennessee, but scattered about the country.

Proto has the bronze wheels, yellow brake calipers, and yellow-accented interior (seats, stitching, etc.).

 

[hipertec]

What tire psi pressure are you set at?

 

[RHE2026]

What tire psi pressure are you set at?

29 rears 32 front. Factory recommends on my door for now. Putting the rears to 31/32 in the colder months.

 

[KrackaC8]

29 rears 32 front. Factory recommends on my door for now. Putting the rears to 31/32 in the colder months.

I've had better luck on these stock tires dropping them 2psi below the recommended (30F/27R).

 

[_ds_]

What tire psi pressure are you set at?

Currently 3 pounds over on the front and rear (35 F/32 R). I life a stiffer sidewall when I am gliding through the hilly turns. Downside is the rear is more inclined to slip if I accelerate out of the turn too hard.

The crap Dunlops are going to shredder in the spring in favor of Michelin PS4 Summer tires (which I run all year round).

 

[jacksonmagnet]

The crap Dunlops are going to shredder in the spring in favor of Michelin PS4 Summer tires (which I run all year round).

Does it get cold where you live? I gotta change the stock yoko summers, cause it freezes here, was looking at ps4 all weathers

 

[KrackaC8]

Does it get cold where you live? I gotta change the stock yoko summers, cause it freezes here, was looking at ps4 all weathers

I had my dad put those on his C6 Z51 and C7 Z51; great 3-season tires for him! (northern MN, gets parked during the winters)

 

[Apex_Z]

2024 Nismo Z w AMS Heat Exchanger, Intakes, Intercoolers, Catted downpipes, and custom AMS EcuTek tune and Michelin Pilot Sports, recently back end coming out to the right more easily on hard throttle. 1st and 2nd gear pulls were always crazy, 3rd anything under 80 kph, gotta be careful, but now even 1/2 to 3/4 throttle, that damn rear end wants to pull and break out to the right (passenger side). Now even 4th gear i have to watch. Tires have less than 5,000 km on them. Road temps were a bit cooler, but wow!

Any thoughts?

Do you know why the rear typically moves to the right?

 

[el mágico]

Street tune > Dyno tune

I did both, street and dyno (at RaceBox). I chose street because that's where I drive the car. However, the dyno was to check all the metrics, so to speak.

 

[jacksonmagnet]

Do you know why the rear typically moves to the right?

I’m gonna guess drivetrain rotation

 

[Drago86]

I’m gonna guess drivetrain rotation

Also the slope/crown of the road if you're in a LHD country(probably the largest factor).

The squishy rear subframe bushings probably don't help, though I installed solid inserts and it still goes to the right just feels a lot more solid.


The Diff also rotates quite a bit to the right due to their only being one offset rear mount that applies a torque to the front two diff bushings whenever power is applied:

This not only allows diff rotation to the full extent the front bushings allow but has also been a known failure point since the 350z which has a nearly identical rear subframe, just in aluminum with slightly different rear suspension geometry. The New Z and the 370 rear subframes are steel and 100% identical. All three share the single bolt diff mounting.

This is from YouTube video but the car was at the drag strip with sticky tires and full bolt ons ~500 WHP and the single stud failed:

Luckily since our platform is so mature, the aftermarket already has it figured out:

Greddy dual stud (hard to find)

)

GKtech:

You have modify the subframe for these but GK sells the needed bits.

 

[el mágico]

Also the slope/crown of the road if you're in a LHD country(probably the largest factor).

The squishy rear subframe bushings probably don't help, though I installed solid inserts and it still goes to the right just feels a lot more solid.


The Diff also rotates quite a bit to the right due to their only being one offset rear mount that applies a torque to the front two diff bushings whenever power is applied:

This not only allows diff rotation to the full extent the front bushings allow but has also been a known failure point since the 350z which has a nearly identical rear subframe, just in aluminum with slightly different rear suspension geometry. The New Z and the 370 rear subframes are steel and 100% identical. All three share the single bolt diff mounting.

This is from YouTube video but the car was at the drag strip with sticky tires and full bolt ons ~500 WHP and the single stud failed:

Luckily since our platform is so mature, the aftermarket already has it figured out:

Greddy dual stud (hard to find)

)

GKtech:

You have modify the subframe for these but GK sells the needed bits.

GKtech +1