That max runs low 12's.

 

NWP test was a 350z with ztube, cone filter and exhaust. The 15 was with the Z tube.

 

I'm having a seriously hard time believing he gained 15. I just don't see it. Especially with the taper adaptor it's going right back down to 70mm which may increase velocity but I doubt it's helping that much

 

I think it's gained in the top end for us less fall off after 6200.

 

^+1 (gonna guess tuning and properly sized intake/MAF tube will be more important than some others). I feel like that's how all the discussion regarding this topic (forcing more air into an N/A engine with bolt-ons) over the years has ended. I'm just not seeing how increasing just the overall diameter of the throttle body can increase power if the piping before/after aren't modified. I'm not holding my breath but it'd be nice to be proven wrong.

 

I remember when Sasha told me he gained like 3-5 whp with his bored-out TB by 2mm . and I gained 9+-whp on my twin TB engine by going 2.5mm oversize.
Gaining 15whp from an 5mm increase should be very close to be true but as you said it yourself and what we learned in the pass.
As long as the rest of the exhaust/intake system can flow enough, I say that 15whp gain is possible on the rev-up and/or bigger cams.

 

I agree for the most part. I think there is still power to be made this way, but not nearly as much or hardly any because of the bottleneck. I know the Titan guys adapted a 90mm TB to their OEM plenum which bottlenecked it and they made around 15whp. They also have two more cylinders.

I am working on a 87mm TB setup right now and the end result will be 4" intake and custom plenum that is the same size as the outlet of the TB so that it doesn't choke back down.

 

^ I've been subscribed to your (and a few other similar) threads. I'm very excited to see your progress and results.

Right, I can understand if the gains were due to the additional flow allowed by cams/tuning. What I don't get is how changing the TB, which is effectively in the middle of a "pipe," allows for gains. Assuming a smooth transition from the differing diameters, wouldn't that just simply decrease the velocity of the air coming in then increase it back to its original velocity? After all, you're not doing anything else to engine to take in more air. If the intake piping from the filter to the TB was also increased to match the TB, then I can see a slight gain from the engine having more access to air. Am I missing something or was the last part of what I said the point of this PnP TB? That is, this mod is for those who are planning on doing extra modifications to their intake tract.

 

Totally agree with this.

There will be a limited gain on a lightly to medium modded Z.

 

So who bought it now that it has gone on sale?

 

They all sold out i know someone on here got one...i know one person that got one but he's twin turbo so i'm not looking for his feedback lol, he did mention he didn't need to do the idle air relearn procedure

 

I have the adapter, already had the TB and PNP harness. Did some track tests with a bolt 350z using stock intake and a bolt on maxima with the 4in intake pictured in this thread.

350z did 3 runs stock TB all 3 runs were 14.1@99, was only able to do 1 run with the 75mm 14.05@99 all runs had 2.0 60fts DA was 1500ASL.

Maxima stock TB with 4in intake 14.8@101 with 75mm 14.2@101. I wonder what GG is going to do with his TT setup. I didnt have to do the relearn on either car or mine.

 

 

Seeing that the Maxima didn't increase its trap speed kinda says something about the power...

 

actually the maxima did trap 103 with the stock TB, but ran 14.8 in the left lane.

He ran 14.8 2 times in the right lane with the stock TB switched TB's and then ran 14.2@101 2 times in a row. Said it was very noticeable, but he does have a large intake.

He tried the left lane with the 75mm, but had a bad launch.

Same 60fts same lane for both cars. I might go test again on Friday using cipher to measure GM/s between stock and the 75mm.

 

Or a dyno......

 

Sounds more like traction issues to me. 6/10 of a difference is huge.

Does that track not give other info about the run? Like 60', 1/8th times & trap?

 

60's were the same. MrEous since you are a maxima owner he has a SSIM (gutted intake manifold) which provides the most for a maxima with this mod supposedly 12+hp.

His bottleneck was the stock TB, this is what Jaypee needs since he is using the stock TB also. He was my original test car, but he didn't come to the track.

Trying to get Hills Garage to dyno test it.

 

Just saying, a 6/10th is a big difference in the quarter mile and have the trap virtually unaffected. A claimed 12whp gain should increase both times and traps. Don't get me wrong, I've been an nwp supporter for awhile, just think the big time difference and no trap difference is strange.

(I have the SSIM as well but consistently ran high 13s with crappy 2.3 60's...trapping 101. This is before 4" intake/maf and any tuning)

 

I saw NWP's reply to one of the fb posters on their page:

"On the 350z, the gain was over 15hp after 5500rpm without any change on low end. In all our tests, no engine suffered from a loss in low end power"

https://www.facebook.com/NWPEngineering

July 4th post

Subscribed for more results..