I don't know about the 2003 Sedan but I know the 2004 Sedans basically dyno the same as the Coups.

The only difference is the Sedan exhaust is only a little more restrictive.

But the 2005 and 2006 REVUP engines clearly dyno diferently from the non REVUP engines. The exhaust on the 2005 and 2006 Sedan also flows a little better than the previous generations. They have a better midpipe.

 

ok i think there's a little confusion here.

from infiniti

03 sedan (at only) 260hp
03.5 sedan 260hp
04 sedan 260 hp
05/06 (at) sedan 280 hp
05/06 (mt) sedan 298 hp

being that i have the 03, i'm *really* interested.

 

Yeah, Infiniti made it confusing, but mechanically, they are all the same engine with the same basic output unless its a REVUP.

 

I'm confused... so basically, I am charged for MREV+ and core, and when I send my core after installing MREV+, then I get reimbursed for it? Is that how it works?

 

Wow,

I was referred to this thread b/c I just got an 05 Coupe...5AT rates at 280 BHP and 270 Trq. It appears I have the good lower plenum, which would make sense since I have more torque than the 05-06 REV up 6 spd Engines that only have 260 Trq, but I would love the 298 BHP too...so do I only need to get the phenolic spacer or what? Also, I think this was asked, but this whole thread is a Chinese Firedrill...so I will ask again...Will The Crawford V5 Upper Plenum work with this spacer/lower plenum (That I believe I already have) or not?

 

as quoted on page 1

"I havn't tested it with a V5, but I'll bet a dollar it works the same."

 

I read your first post, looked at the graphs, and still am slightly confused by the gains/price of this mod.

Can you spell it out in layman's terms please?

 

The gains made by the machining process if no other mod is used is shown in the second plot. Its $122 if you exchange your lower plenum with it.

 

So can you please make it clear for me as well? I now don't have any thing, my car is just stock, NON REVUP egine (03 G35C).

To get the MREV+, I'd have to send in my lower plenum as a core exchange + $122. That'd gain me ~8hp (not WHP right?) - The 2nd Graph

That alone, if I want more power, I can get the uper plenum spacer, that'd be something different and independent. (gain show by 3rd and 4th graph?)

Both of these application are also suitable for FI later on, right? These gain are calculated by WHP or HP? From the graph, it looks like they've been dynoed, thus means whp, but you label as HP, so I wonder if they're actually the gains at crank?

Am I correct?

 

Hey Tony so when are you going to post this thing up in the website? I wanna get my hands on this bad boy!

PS. Keep us updated when your done with everything i still got some questions i wanan ask you about this product.

 

I asked that question before I had my coffee. This makes much better sense after actually looking at your plots. Where did the results you posted come from? Obviously the plots are based on crank horsepower, not wheel horsepower but where did you get the data to draft up these plots? I'm not doubting your credibility because it is a well known fact that you produce an excellent product, but I'm trying understand your data.

Also, what differences would you expect in the plots if utilizing a 1/2" spacer as opposed to the 5/16"?

Thanks!

 

From those who are keeping score, here is the actual breakdown of Infiniti VQs in G35s, and my best theories as to the differences:

• 2003-2004 G35 Sedan: 260hp, 260lb-ft torque
• 2003-2004 G35 Coupe: 280hp, 270lb-ft torque
  (apparently due to ECU flash, intake, exhaust)
• 2005-2006 Sedan/Coupe 6MT: 298hp, 260lb-ft torque
  ("Rev-up" motor: VVTe, higher RPMs, ECU flash)
• 2005-2006 Sedan/Coupe 5AT: 280hp, 270lb-ft torque
  ("Rev-up" motor: VVTe, higher RPMs, but diff ECU flash?)

Now, my understanding is that the MREV package and the Crawford both effectively increase airflow thru the intake plenum. The Crawford simply makes the upper plenum non-slanted and equalizes the runners, where the spacer increases all runners' headroom and the lower plenum changes equalize runners 1 & 2 to the others.

So, the question of whether the spacer and/or lower plenum mods help when you already have a Crawford, IMO, would be answered as a maybe and a probably not. The lower plenum changes do the same thing as the Crawford is designed to do, so I doubt there'd be much improvement there. The spacer in theory could increase airflow with the Crawford, or it might not.

So there are my theories. I'd love for someone with a Crawford to buy one or both of these suckers and dyno them to prove it.

Thoughts?


Rick
(2004 G35 Sedan w/Crawford v5, for those who are wondering.)

 

There are a few mistakes in your info
for instance, the 2005-06 motor for the AT is NON REVUP and
they don't have a VVTe and higher RPM..

 

When are you going to post this things up in the website?

 

You could certaintly dyno it if you like.

Tony