Well, that's what happened bud. Trust me I ain't happy about it either, but I understand that's the way it is when chasing a number (1000 in this case) everyone has their own theories and thoughts and opinion but truth is I'm the only one that's done it.... No one else can actually know first hand what it is exactly, the car is fine, the motor is Golden turbos are good I mean my tuner just told me right now "if your car had anything else wrong with it he would have let me know because he knows I would of had it fixed immediately. So car is going on the dyno sometime today or tomorrow.

 

Our cars are turning into money pits smh

 

True That Nismo350Z#0310, here are the numbers with the GTR manifold they look pretty healthy to me but still not as power full as my old set up.



[dQUOTE=Nismo350z#0310;10750743]Our cars are turning into money pits smh[/QUOTE]

 

The lines are way cleaner (higher smoothing?), but looks like there is some flow issues.

Has any one seen any flow results from AAM or GTM?

Does the stock GTR manifold suck that bad?

 

I don't think they ever had it tested or released any data about them.

The only flow results I've seen is from RJM which is just the lower manifold.

I don't think they are bad. I'm still waiting for my full manifold kit to come so I can run it on my NA setup.

This is the only info I found about the OEM GTR manifold Vs Greddy.

 

Speaking with Bobby from RJM, basically the dyno test for the high boost application showed a increase in 3 AFRs from just switching from the GTM to the RJM lower.

Basically it's HUGE. Air flow is insanely more. Add more fuel to it and ZOOOOOM

 

I knew it.... They will only claim Gains when they add more fuel and boost to it... Not a fair comparison in my honest opinion. Any car can gain more power with more fuel and boost, a straight up comparison same boost settings and fuel settings just change the plenums and compare.... Anything else is BS

 

The guy kept all the settings the same (tune and Boost) and was running lean with the RJM. He couldn't adjust his tune bc it was lock at his end. I think it's fair if more fuel is added and kept the boost the same. But we won't know anytime soon until he switch to his new kit (Fast Intention).

"Our final comparison will be the best GTM/Gamma could produce versus the best Fast Intentions could produce."

 

Then again, all of this is being done to a 370Z right?

 

Yup, you are the first on the HR boosted application. Jake is testing this on his 370z NA. I hope to get mine soon to test it on E85 NA setup.

 

I will also have numbers soon on an HR boosted.

 

We're going to compare stock to RJM/GTR with the same boost level. You'll always have to add more fuel if you are moving more volume of air, otherwise it'll run lean. That would still be a good comparison. The gains expected from the new intake manifolds is due to more efficient movement and increased volume of air. Any car can gain more power with more fuel and boost up to a point. But increasing the air volume and keeping the fuel settings won't give any useful data if the car is running lean and could hurt the car on the dyno. Boost + knock = boom.

 

So by your "Theory" the loss of WHP that I got from this conversion is normal? Because from what I think your saying is that since I am adding something with a lot more room for air, Threfore I need more fuel and air to fill it as fast I I used to with the OEM manifold?!?!? 🤔

 

The tune is the exact same, therefore, it would have to change tunes and fuel to see gains.....

The reason the AFR is a retarded 3 points higher is due to the fact more air volume is being taken in. So more air than fuel. Modify the fuel to the air ratio, the same as before, and you are making more power with the same air to fuel ratio tune.... see?



And for me.... I doubt .2 liters would allow for loses when we are talking 1000whp and +30psi of boost.

but I will see at some point in my build... in.... 2.5 years

 

^^^ Yup what he said.


I'm curious what was your AFR when you had the car dyno'd with the GTR manifold. I have to guess that you were running super lean when you added more boost without any tune (Fuel adjustment).

 

I dont know how to answer those questions, since my tuner only calls me tells me what it is.... And if it's not going to work or hurt my motor, he just recommends uninstalling the parts. Here is the only graph of the GTR dyno pulls

 

I'm not a tuner expert, (someone correct me if I'm wrong). From looking at the graph your AFR chart are reading lean at WOT.

 

That is not A/F, its boost logging.

His tuner put on the GT-R manifold, and began tuning for it, and aborted the mission when he found that the car made much less power at the same boost.

This vehicle owner did not just bolt on the GT-R manifold and attempt to dyno it himself. His tuner had to do the full install which most likely required altering his intercooler pipes and fuel lines and vacuum line setup etc. I doubt at this point they were going to just do a half *** dyno pull and see what happens. This car was already making over 900rwhp originally, they were going to go for the gold.

 

Do we really believe that a GTR manifold would create that much a loss in power, or is there something else at play here?

 

Difficult to determine 100% from here. We will know more when we see direct comparisons from more than one car.

I think it makes some sense.. after all, we see in the comparison graph posted that its about a 50hp drop, maybe a little more since the graphs shows them 1psi apart. That type of power is pretty easy to make with an intake manifold upgrade, so I would say its pretty easy to lose with an intake manifold downgrade.

But on the other hand, what has me still a little on the fence now that I see this dyno graph, is that the power-band does not appear to have changed shape.

The 2 graphs overlaid, with no back-story, would appear to me to be from the same setup car just the red graph was a higher boost setting so the power continued to climb and then follows the same curve. That's exactly what it looks like if we ignore the story behind it.

I would have expected that the GT-R manifold produced some mid-range power over the stock HR stuff, and then would begin to fall off towards redline. But again, they are producing identical powerbands, only one more powerful than the other. That is surprising to me.