Hi guys,

this is my first time tuning with an Uprev product. The car is a 2003 Nissan 350z with the Turbonetics single turbo kit (60-1 turbo) and Snow Performance Methanol injection before the throttle body. Currently, it has some Throttle Tip-in stumble in 3rd & 6th gear (around 3,000rpm) along with rough warm starts (requires pushing gas pedal ~30%). UpRev's cable manager reports the following, but I want to ask those of you experienced with UpRev cipher/osiris if I can tune real-time A/F with this UpRev cable?:



I'm waiting to get full access to the car, but I would appreciate any input from those of you with UpRev 350Z tuning experience. Thanks in advance .

 

You should be good as long as the car has factory widebands...

 

For the rough warm starts, lower the % in the cranking enrichment some. What size injectors you have?

 

Thanks for your quick advice guys. The seller says the car has 850cc RC Injectors. Since the consensus is to limit power on these stock motors @ 400hp or less, I'm thinking of uninstalling the methanol injection because I'm not a fan of uneven meth mixtures to all cylinders via nozzle injection. The boost kept creeping to 10psi "ish", so I'm thinking of installing a good Electronic Boost Controller too (any recommendations?). Here is the engine mod list:

Turbonetics turbo kit
Spearco front mount intercooler
HKS super sequential blow off valve
Snow performance Methanol injection
850 RC injectors
Osirus custom ECU
DC headers
Custom Stainless dual exhaust 3''
Walbro fuel pump
Intake manifold spacer
4.08 Nismo rear-end gears
Carbon fiber radiator shovel
Halman manual boost controller

Lastly, which spark plugs are you guys having luck with as far as working well on these turbo'd stock motors? I will post the results for you guys with a dyno video when she's done, but the car looks beautiful!

 

Wow those are huge injectors. You could get by with 440cc, but I would recommend 550cc just to be safe.
If you don;t mind post a shot of the cranking enrichment table.

 

What is the A/F during stumble? I'm guessing you're way rich given the massive injectors and probably a rough tune since you're only street tuning and new to the platform (I assume). And I don't think pre-'04 has widebands, so you'll have to use a dyno to get the A/F dialed in 100%.

 

I forgot to mention the car has an AEM Uego wideband and a boost gauge. It's my buddy's car and he just bought it, so my task is to clean up the tune..ah how fun it is to complete someone else's "almost complete" job ha! During WOT, the A/F was solid in the mid to upper 11's. I remember watching the a/f shoot very lean after the stumble during partial throttle @ ~3,000rpm, but I think it could be doing that if it were momentarily overly rich too...I'll know more when I plug in tomorrow. I'll post that enrichment table tomorrow . Thanks again for all your input!

 

What do the A/F look like just sitting there in neutral doing a very slow rev sweep (over course of 1 minute) from idle to 5k? Should be as close to 14.7 as possible the whole time. Do you have an HPX (aftermarket) MAF? BTW the TN kit is notorious for creep, I doubt an EBC will fix it unless you've also modded/fixed the wastegate/dump tube setup. Terrible choice in kit if you ask me (or do any research).

 

I couldn't find any detailed pictures of that area of the turbo kit online and it was night when we went for a test drive. So, I'm assuming you're referring to the angle the wastegate tube attaches to the "manifold" pipe before the turbo. A bad-for-flow wg angle makes sense explaining the creep to 10psi. The good news is it didn't creep to 11psi...just stayed pegged in 10psi territory (analog gauge).

My concern is if 10psi will result in above 400whp because I want this motor to last.. The kit came with the car, so we're stuck with it. We rescheduled for tomorrow regarding logging and drive-ability tuning, I'll keep "ya'll" posted .

 

Here is what he was talking about the Boot creep. Turbonetics made a updated waste gate pipe. You may have to have a account to get this file.

http://turboneticsinc.com/forum/atta...cation_145.pdf

 

What were the outside temps? A cold day will really aggravate the creep. Although I have a completely different setup, even with ported exhaust housings (internal WG's FTL) I still get some creep on cold days...I typically run with the EBC off if it's <60* outside.

 

Okay gang,

the car starts up much better with these ngk iridium IX spark plugs, but after a ~2-3 minutes it starts misfire and consistently pops the P0300 multiple misfire code. So, I used Cipher's Cylinder Power Test and all cylinders responded the same to being turned off, so I'm guessing it's not a coil pack. Also, there is a slight delay after pressing the throttle pedal until the revs follow the user input.

When I first received this 350Z from my friend it was showing "P0175, System Too Rich (Bank 2)" in addition to the P0300 code, but it's only showing P0300 after the new spark plugs change and during the idle test. I'm waiting for a license update from UpRev so I can mess with the Rom Editor, but have any of you experienced a misfire like this?

The only things I can think of are vacuum leak and maybe electrical issue / bad ground somewhere?

 

^^^^ Sounds like the thing is running rich fouling out the plugs, install new plugs...ran great for a few..and then fouled them again..

Check you A/F correction, chances are its pegged at 75. 850 Injectors are way to big for your set up, if your not familiar with uprev its gonna take a lil while to get them trimmed in properly. I would suggest smaller injectors or get a fuel return system and drop the static pressure to like 35psi....

 

^^ yea 850cc is going to be a pain. The jump from 440 to 600 kicked my a$$ enough already. Still haven't gotten startup 100% happy.

 

Vince (and everyone else),

thanks for your input. My understanding is because the car is a 2003 350z (USA model), it does not have factory wideband 02 sensors that UpRev can log.

So, I have to rely on the AEM Uego wideband gauge. When the engine was warming up from a cold start (smooth with no problems) and the a/f approaches ~14.7 a/f, that is when the misfires start and it idles leaner dancing above 14.7 a/f. Also, if I punch the throttle quickly, post-tip-in a/f goes hella rich (10:1 on the UEGO gauage).

I'm still waiting on UpRev's license update so I can use Osiris and play with the rom editor, but do you still think too much fuel is the problem when it's misfiring at stoich and above afr's?

Cipher's RTT Tables from ECU:




I'd like to try dialing the driveability in if it's possible instead of replacing parts... working on 350Z + my hands =

 

UPDATE
Vince was correct!
I removed these new iridium plugs with 0 mileage on them and they had a caked fugly thick Black carbon coating...definitely fouled! I ordered some NGK LFR6A-11 (non iridium = copper) today, so will actually get some meaningful tuning done tomorrow..hopefully. Also, found out these injectors are the following:

RC Injectors, model SL4 750 (not 850cc like the seller advertised!)

RC Engineering doesn't make them anymore, something to do with being too "low pressure" rating..

With 93 octane pump gas, how much wheel horsepower are you forced induction guys getting? My goal is 370-375whp in this ~80 degree heat because I know in colder weather it will make more and I want to limit the output to 400hp max. If these injectors don't provide smooth enough driveability, do you guys think 440cc RC Injectors would work well given the power goal?

DJamps: It was about ~70 degrees F that night we did some pulls and the boost crept to 10psi. I've since lowered the halman boost controller settings, so will know more when I get it on the road..

My first flash with Osiris went well and the car idled better than before, but the misfires from the fouled spark plugs was too much to bear, so I stopped. Simply changing the K Fuel Multiplier from 27,592 to 10,669 was a huge help in not immediately idling pig rich after cranking..

 

I'm a little worried that your A/F target table is still stock...did you leave the timing table stock too?

 

djamps,

I returned fuel & ignition tables to stock just to get the idle right for the time being. Ignition timing will be dialed in on a DynoDynamics. Attached is a recent log of idling with the new spark plugs. Is it normal for the Throttle position voltage to be ~0.6 volts when it's fully released?

After reading the manual, I'm a little unlcear about the A/F Target table's utility. I understand Base Fuel Schedule is the theoretical injector pulse required to maintain stoich AFR. But if this 2003 ecu does not receive wideband 02 sensor feedback signal, how does it know if it's hitting those A/F targets? Att Thanks!

I did the following just to get the K Fuel Multiplier close enough and maybe try altering the MAF "data word" values before tweaking the Fuel Compensation:

 

Subscribing.

 

After a test drive tonight, I was performing a flash from rom editor (like before) with some updated MAF values and much to my dismay it said FLASH ERROR . I tried reflashing with Osiris, but the radiator fans blast away with the ignition key in the ON position and Rom Editor and Osiris just say Searching for ECU... I think it's bricked??? FML!

Answers to previous ?'s
1. Djamps, I couldn't sweep the rpm range to give you accurate A/F #'s because there was always a misfire
2. Mass AirFlow Sensor "appears" stock with this Number: AFH70M-38 (3401 below) + 22680 7S000 & looks like this:




3. Cranking enrichment table: