Nice segue back to the original post topic G45Tech.

Now, here's what we know:
- the 6MT's (sedans and coupes) are getting the 298 Hp engines
- the 5AT's are getting the lower-Hp version,

Here's the $1MM question, does it make sense for Infiniti to produce a special 3.5L for the 6MT, i.e., S1 engine, and not amortize costs across the line with the same engine but change intake, exhausts, and mapping? I think that 18hp increase at the crank does not warrant the additional costs throughout their supply-chain but that's my MBA side of me talking.

Memphis
04 G Coupe 6MT | IP | Clear Bra | 15% Tint | Clear Corners |

 

Hey Memphis,

My gut and business sense want to agree with you about the additional costs, but Infiniti's recent history show a slew of mid-year model changes and standalone models. From the 'doggie door' change in '03 to the 5AT sedan with its mechanical fans, right up to the ULEV designation in '04.5 indicates a lack of streamlining in the manufacturing end. I truly hope it is a hardware swap, to allow retrofitting to earlier models.

'04 G35X Graphite/graphite, NAV, wood, premium

 

I want that rev matching downshift badly - i'd hope that's all TCU changes that can be retro-flashed. I'd bet the 05 ecu wont work with the 03 or 04's as I thought there may be different cams or something.

2003.5 DP 5AT Sedan
14.2 @ 97.18
Z-Tube
K&N Drop In & Airbox Mod
10 Wire Hyper-Ground
Crawford Plenum (V4)
UR Crank Pulley
Hotchkis Sways (M/M)
Polk EX-3500 Tweeters/Shock Sensor/H-Liner

 

"Besides changing the valve lift, an 0.010-inch lash-change also alters duration at 0.050-inch tappet lift by about 4-6 degrees as measured at the valve. Typically lash is varied 0.005 inch at a time to see if the engine responds. Really hardcore builders run "lash loops" separately on the intake and exhaust sides for every cam they test.

If power goes up with more lash, the cam may have too much duration. If tightening the lash increases power, you need a bigger cam. If the cam makes its best power with the lash set per the manufacturer's recommendation, it's pretty close. Caution: Typical modern cam lobes won't hold up for long under large lash variations. Some "tight lash" grinds (cams with factory setting under 0.015 inch) don't like more than 0.005-inch lash changes."

G35 hot [176F] intake lash is 0.012-0.016"
G35 hot [176F]exhaust lash is 0.012-0.016"
So there is a 0.004" acceptable variation representing 2-3-4 degrees CAM duration variation.

Hopefully most engines are set at the midpoint within 0.001", there are 27 different valve lifters each in 0.0008" incremential sizes.

This ought to give you engine optimization people something to fiddle with - changing the valve lash.

We have lots of experience with the new for Nissan solid lifters as the Lexus ES300/LS400/LS430 have used them [something similiar] for years.
We make lots of money resetting [replacing bucket lifters] when the engines get noisey after the warranty runs out.
Takes about 30 minutes each after the valve covers are off but the Lexus has replaceable shims which slip out whereas the G35 requires cam removal so its 10 hours plus the 6 x 2 or a 22 hour job if they all need resetting/replacing.

Something to worry about 10 years from now!

 

Right on, Memphis! Now that this thread is swinging back on course, that's precisely what I was getting at. I doubt that the VQ with the NISMO S-Tune mods (creating the "S1" designation) would be something that Nissan was willing to stick in the '05 6MT. I'm with others who expect the gain to come from a revised ECU and possibly a revised intake tract.

I'm also with those others that hope that the '05 6MT is packed with the NISMO-laden "S1" VQ. It would make the wait so worth it... ...but reason suggests otherwsie.


'05 IP(or ?) 6MT... ...Never too soon to think about modifications!!