I am trying to figure a couple of things out before I start to tune my car.

My Setup:

2002 6MT
t3/to4e at ~4-7 PSI
Ebay Intercooler
2.5" Mandrel Bent Exhaust (Turbo to rear bumper)
Wastegate dump
Mustang Cobra 470cc Injectors
E-Manage Ultimate
93 Octane Fuel

I am going to shoot for a 10.9 AFR, due to streetzlegend's findings about how the VQ35 can run leaner on different banks at different RPM's.

As far as ignition timing goes, I am not confident in my knowledge just yet...

Where is a good place to start?

I was planning on pulling 5 degrees at WOT and 1 additional degree for each pound of boost ( I have a MAP sensor hooked up to my E-Manage).

Any input on what a good timing curve would look like? What should my peak ignition timing be at 6500 RPM?

I do not have a J&S Safeguard, so I would rather be on the conservative side. I do have the stock knock sensor hooked up, but I definitely do not want to rely on that.

From the small bits and pieces of information that I could gather from the 350z forums, it looks like 18 degrees is "safe"...sound about right?

I am shooting for 380WHP.

 

Without knowing when the turbo will start to spool, make full boost and when you'll reach peak tq I would just run a static 17degree's to be fine and adjust from there. But on 4psi can you pretty much run a stock 4gen timing map and be fine.

On my G35 I was going to have r/t tuning leave the timing stock and just pull per every psi after 6, for per the coolant and intake temp. Then just pull like 10degrees and run like 10.1 a/f if boost goes above 12psi kinda like a limp mode. But that is with osiris not sure if the em can do that or no

 

honestly for 7 psi, id leave the timing alone and slap a meth kit on the car, maybe if possible setup a pressure safety switch incase the meth pump ever fails and take timing off if that can be rigged using the eu.

 

i have seen a 3.5 altima dyno with a gt35 @ 8 psi with stock timing and a meth kit, put down like 380 whp but with a good intercooler,3 inch catback, ust fuel control

 

on my maxima thats what I am planing to do, 6psi stock timing, 10psi stock timing and meth. I am still making payments on my G35 so gotta be anymore careful

 

I was planning on doing like t6378tp said about having it go into "limp" mode when a certain pressure is exceeded. I was going to have it pull a load of timing if the pressure goes past 8psi, just as a safety net. I have a timing vs pressure map on the EU that I can set to whatever I want.

I might pick up a meth kit in the future, when I get tired of this setup, but for now, I would like to work with what I have.

It seems the general consensus is about 17 degrees. I would rather play it safe and make less power, as this is my only car and I'm just about out of $$$ after this build.

The reason I say 4-7 PSI is because I have a 4 pound spring in the WG, but I haven't actually taken the car into boost yet, so I'm not sure how much boost I'll actually see.

 

Do yourself a favor and at least weld in a manual cutout as close to the turbo as you can (at least 18" away though) because that 2.5" is definitely going to kill you on power.

A custom water/meth setup can be pretty cheap and great for peace of mind.

Looks like the timing advice has been pretty well covered, I wouldn't know what to tell you anyway!

 

I know. I feel dumb for going with the 2.5" now that I've had time to think about it.

That's the sole reason that I didn't route the wastegate back into the exhaust.

I might make another down pipe that just dumps it about a foot or so after the turbo. I would use that one for track days. I don't think I can fit a cut out anywhere on my downpipe close to my turbo with the way it is routed right now...

I plan on making a build thread once I'm all tuned and ready to go so you all can see how I did the piping.

 

how did the wastegate placement work out for you

 

Everything worked out great. I had to modify the front manifold/crossover pipe because it was hitting the starter though.

I bought a wastegate elbow off of ebay and it placed it in the perfect location, because if I mounted the wastegate straight on the manifold, it would hit something (I forget what).

I also had to delete my driver's side rad fan. I only have the one stock fan now. I will see if I have temperature problems. If I do, I will mount two slim fans in front of the AC radiator.

Picture from early on in the build:

 

Told you it would hit but atleast it was a easy fix. Do you plan to run the downpipe under the tranny or across the motor mount and under the oil pan

 

I ended up running it under the tranny. I kept it as close as I could so I wouldn't lose too much ground clearance. It's about 4 inches from the ground...

 

If you dont have meth yet id go with what was mentioned, tune it to 15-17degree 17 being highest at redline. Also tune using pressure not throttle position. Even on low boost id still tune a stock 3.5 block with this timing. Part throttle timing is what you wanna focus alot on, specially if your turbo spools up quick, like when you pass someone on the highway (40deg of timing + Xpsi = eeek)

 

I got mine the start pulling 1 degree per psi after 5lbs.. but im only at 9lbs I havent had any problems... I do plan to get the water/meth kit pretty soon..