MIAPLAYA

iTrader: (3)

It does vary by boost pressure however since this is not a return system. He could send it back for another flash though.

DBZ33

iTrader: (2)

I have no idea Mia. Maybe Tuan can explain it better.

zero2prove

I asked TN to make the correct changes, they said I'd have to ship the ECU to technosquare.

-Tuan

MIAPLAYA

iTrader: (3)

Hmm interesting. So do you still not agree that checking the fuel pressure is valid? If thats the issue then a new flash is not needed. Especially considering over 20 kits are on this board and TWO are running lean.

zero2prove

Mia,

I believe the TN injectors are either 380cc or 420cc injectors. At 8 psi those injectors probably flow more like 350's since you won't have 60psi of fuel pressure to make up for the boost in the manifold. I'm thinking FP might be below 50psi, I'm not sure since I didn't log his fuel pressure. So indeed those injectors can be maxed out without a 1:1 rise in FP.
The unichip did work in the midrange where he was lean but than would lean out again by redline - I think the injectors were fully open the whole time after 4500 rpms.

-Tuan

DBZ33

iTrader: (2)

Mia, I asked Tuan about that and he said that he watched his installer do the modification right in front of him.

MIAPLAYA

iTrader: (3)

Actually those injectors flow 380 at 2.75 bar not the industry standard 3. Denso tests their injectors lower then everyone else. Turbonetics sets fuel pressure at 53 psi off boost. Under full boost the lowest fuel pressure I see is 47-48 PSI. Read this thread: https://my350z.com/forum/showthread....ighlight=denso

Oh and BTW Turbonetics tested my car at 10.5 PSI and they didnt max out till past 5500.

35ounces

iTrader: (5)

Its definitely worth checking the fuel pressure in any case. At least you will know what its doing and if its a problem. Maybe something else is wrong with it.

edit: grrr

taurran

iTrader: (18)

MIAPLAYA

iTrader: (3)

So basically to further clarify Denso rates these injectors at 380cc at 39 PSI of fuel pressure which is WELL BELOW the 53 PSI base pressre Turbonetics sets and still VERY far below the 47-48 PSI I see DAILY under a full 8 PSI of boost. So unless the fuel pressure is below 39 PSI these injectors are in NO WAY SHAPE OR FORM maxed out. The more likely scenario is that the car is running lower fuel pressure then it should and between 3000-4200 when the flash is running less pulse width the fuel pressure is not high enough to achieve the proper AFR. Later in the power band when the flash kicks up the pulsewidth its enough to keep it in the high 11s which is still AT LEAST 5-9 points higher then EVERY OTHER available graph. Furthermore if the Unichip was able to tune out the lean spot in the midrange but got lean in the top end then it HAS to be a fuel starvation issue. Given the data I have provided about these injectors the only logical answer is that the fuel pressure is too low or the fuel pump is not delivering adequate flow. Assuming that the Walbro 255 lph pump was included with this kit as long as it is installed right that is also not likely.

zero2prove

Mia,

Please explain why the AFR at 2000 is 11.7:1 and the AFR at 6000 RPM's is 11.3:1. Who would tune at 0-1psi of boost at 2000 RPM to run 11.7:1 AFR? If there is something wrong with the FP it would carry through out the RPM band in boost, expecially by redline at 8psi, not just between 4000-5000.
Irregardless, I'll have an adapter fitting coming in soon to test FP to see what I can find out for you.

Cheers,

Tuan

DBZ33

iTrader: (2)

I just can’t wait to tune this car so I can drive it with out worrying about anything going wrong.

Peking

iTrader: (2)

For real, how do you install a kit and not know what exactly was included


I do

But honestly I do think there is a difference even beyond the type of dyno reading. Like rollers from one shop can read lower or higher than another (not sure why, but has happened), seen it and heard about it. Many factors may or do play a roll, but anyway I have the graphs in my last thread in this section that shows my las run with a DynoPack, and my baseline with a DynoDynamics (which some believe or have seen lower results than others)... And I did around 20 something WHP more on the DynoDynamics... So go figure I guess.

MIAPLAYA

iTrader: (3)

Why would you not? Is there a reason that running a little leaner there hurts? Its sub 12s and by no means the point of peak torque. Can you explain to me how the injectors are maxed out? Considering the data I provided unless the fuel pressure is low, or unless you didn't install the fuel pump that came with the kit, or unless you left in the stock injectors, theres no way your "Theory" of the injectors being maxed out is correct. 380cc at 39 PSI is the Denso flow rate for these injectors. So unless the fuel pressure is well below that they aren't maxed. And I'm not sure how many ways I can tell you that there are people running upwards of 10 PSI on these injectors and they don't max out. Matter of fact the highest so far is 10.5 PSI on my car on the Dynapack and my car didn't go into the 12s till after 5500. Whats the ONLY common thing between the reflash and your Unichip tuning that could make the car lean? Hmm 3 things, fuel pump, fuel pressure, injectors. We know the injectors aren't maxed, I can only assume you actually installed the Walbro 255lph pump that came with this kit but I'm not at your shop, and the fuel pressure.

EDIT: And FYI it IS Carrying throughout the RPM band. His AFR is a bit leaner across the board then most I see.

nissansource

iTrader: (10)

Air Meter on Z33 will max out b4 those injectors =) btw its PRETTY DAMN CLOSE to being already

It is time to find an alternative airmeter and tune for it anyway or swap to map. when is TN going to do this along with ts

MIAPLAYA

iTrader: (3)

Stage II my friend....stage II

nissansource

iTrader: (10)

ah lightning maf maybe??? or that promaf whatever name company proflow

MIAPLAYA

iTrader: (3)

Neither....

DBZ33

iTrader: (2)

Called GRD today and was told my UTEC was ordered with the Wideband O2 that they sell. They also got their beta UTEC today. Tuan said he is going to install it on his APS TT 350z and run it for a few days and make sure everything is good before he installs it on my car. I can't wait. Wish me luck.

Sharif@Forged

iTrader: (92)

I scanned through most of this thread, The most important this is to first get your own wideband and watch it in the car. I have seen many cases of dyno based wideband sensors that are faulty, or not properly maintained...or the readings are too delayed. I am not suggesting that GRD;s wideband is faulty....but I am suggesting the a wideband guage is manditory equipment for anyone going FI.

Second, your car is lean for a brief moment..right at 4000rpm..and even then, not terribly lean given the conservative timing that the ECU flash puts into place.

Lastly, nobody should expect perferction out of a reflash. Each car is going to respond a little different...some lean...some rich. I think you are doing the right thing, in install a UTEC, or an eManage Ulitmate, along with a return fuel system and retune. You will be really happy with the safe results it will generate. And nearly 400whp already is nothing to be unhappy with.

I wish you the best of luck, and if you need any assistance, dont hesitate.