Hi guys,
Sorry if this has been covered before, I had a search and couldnt find anything. I have a nissan Stagea m35. It's a jdm wagon, with a vq35de, awd, and auto trans. I have fitted it with a HKS single turbo kit, consisting of a gt3037 1.12 rear housing and a 60mm ext gate. Stock pressure for the gate is about 4psi. I'm using uprev, after dumping my rom and getting it mapped by uprev. I have the tuner version. I had the car tuned, but did not produce a lot of power. I have the supporting mods, exhaust, 600cc, pump, correct plugs.
What I Have noticed is that my ign timing is very retarted at wot/load. Even though the table is advanced, I'm seeing only 10-13 degrees at load wot boost. I think this is because my afm or maf is very close to maxing out. I've seen a max of 4.94v. Is this what other people have experienced, the ecu cutting timing at the end of maf scale?
I have ordered a gt maf, so I hope I'm on the right direction? Hopefully I'll be able to get a bit more timing in it with the new maf.

We don't have many FI 350zds or v35s in Australia. So finding info locally is hard, even though we have Good tuners.

Love the forum guys.

 

Lack of timing is not the MAF. The symtom of a MAF maxing out is total limp mode . Either you have severe knock retard or a bad tune. Curious what your timing values are in the right most columns.

 

regardless, the MAF is also max'd out if you are seeing much above 4.8V. That also needs to be addressed.

 

GTM has stock MAF and stock ECM at 1000 brake horse power. G35driver members said "**** that" 2 years ago.

 

Stock MAF tops out anywhere from 350whp to 400whp depending on setup. Uprev GT MAF max around 500whp. PMAS is good for 800-1000whp.

 

Yes, it is the PMAS they are using with stock ECM. http://www.youtube.com/watch?v=dpSVp32eTrM

 

The 370 (HR) has 2 MAF's so can handle double the hp of a DE before MAF limitations. I was quoting those numbers based on DE results.

 

About 43 degrees. I wouldn't have thought that was excessive, but then, we don't have experience here. Maybe it has knock volts on the ramp up- I'll have to check. Care to shoot me a timing table?

I believe dynos are for tuning, so I'm not looking for a glory number out of a stock block. An please don't take offence as its just a fact, dynos in the US do seem to read high compared to what we produce. For example, that video that was posted- the ramp rate of that run is really quick, and that can effect results.

Thanks for the help guys.
Oh, I'm tuning on 98 which I think is equivalent to your 93.

 

Your peak timing under boost should be around 20, if you are commanding 40 degrees then the car will detonate and reduce timing. You can bring it up quickly before the turbo spools, but you will generally have to knock it down to whatever level your car will tolerate once full boost is reached, and then hold or ramp slightly (2-4 points) back up towards the top.

These numbers are in actual degrees though. If you are using the nissan fuel burn time numbers, they will be higher.

 

OK, so I put a simple table onto the car with low load areas around 30 degrees and high load area around 15 degrees. Set electronic static timing to Zero.
Instant change, the car wouldn't rev up clean, I was seeing single digit advance at low load, back firing, even det back through into the plenum when I rev'd it. Didn't see anywhere near those numbers in the table.

Which makes me think my static timing out of whack. I know how to check with a timing light, mark etc etc, but I don't have one.
How do you reset static timing once you line up the marks?

 

Dude you should read the manual. You aren't putting in degrees. 43 is about right for 10-13 deg at WOT.

 

Lol. Yeah, if in doubt, go for the instructions.
I just figured that out. Its only the second FI Uprev tune in Australia, and the other one is 2500 miles away.

Thanks djamps.