BluestreamDE

This has been a very frustrating thing to pin down to fix, just feels like one thing after another. I was able to to the relearn for the throttle with success and idle is fine but AFR is still lean as hell 18.0 and up. I went into my street tune just for ***** and giggles and multiplied my lower load range on the fuel comp table by 30% and now my AFR is now richer moving in between 14.1-15.6, test drove the car and it is hesitant when gas is being pressed but evens out after 2500rpm and acts normal with normal range AFR readings. My fuel pressure is fine I just checked that, I'm not thinking it's the injectors being clogged. I soaked them in fuel system cleaner before but I guess it wasn't enough.

BluestreamDE

I Seafoamed the **** outta my Z, full can in the tank and the spray bottle thru the intake and things are looking better in terms of AFR and Vacuum at idle, however idle speed still high at 1100-1200. Driving normally however the Z behaves like it is supposed to. Also fuel comp table at low-mid load is reduced by 15% to hit the 14.7 stoich target so I am sure this is an injectior issue. Driving with 3/4ths of the gas pedal down engine felt hesitant at times like jerking ever so slightly. Gonna buy new injectors and hope the problem goes away.

BluestreamDE

Btw this is a pic of both my throttle bodies, the one on the left came with the car and was modified by the previous owner to a bore of 72mm. Anyone know what company does this? The one on the right is a used OEM replacement that is on the Z now. I am not getting codes for the throttle body.

OldManZ350

iTrader: (23)

Their are better places to spend money.

BluestreamDE

I understand what you mean, but I have done everything I could to figure out the problem on my own, instead of paying the stealership money to tell me something i already know.

BluestreamDE

Car is back to normal this AM New injectors came in yesterday 2 day air and I installed them and the lean misfire issue is now gone. Possible stuck or intermittently stuck injector was the culprit on my old set. Afterwards when I brought my Z to a shop here that had a CONSULT II, they redid throttle idle relearn, accelerator pedal release and closed position learning and the Z is good as new, No lean misfires but a suggestion was made to replace my spark plugs as I cleaned them 3 times of fuel and carbon trying to diagnose the issues on my own.


Future plans for this car is to buy a fuel return system or make one on my own for cheaper. Also I want to do a stage 2 clutch and long tube header install with a set OBX-Rs from NAbuilderZ33 before Xmas. Next year I will focus on building the bottom end with a basic high compression 11.1 block, Revup oil pump, ARP head bolts, more boost using the 2.87 pulley, 34T Jackshaft pulley and hopefully a Treadstone Tr1245 Intercooler along with using methanol injection for the topend after 5k rpm. Thought about cams but I would like to see how far I can get with stock heads and a 7000rpm redline. the Kinetix manifold will help to carry the power farther so im hoping for good results when the time comes.

BluestreamDE

Nothing really new to update other than purchasing and installing the 34T Jackshaft pulley. Car is running fine and strong. I am near the limits of my returnless fuel system, I am getting 97% injector duty cycle at 6600 redline with 13.2psi, 11.5afr and 17° advanced timing from 3k rpm, tapering down gradually to 12° after 6400rpm due to slight knock at topend. My intake temperature is also really horrible, I am seeing anything from 40-50 degrees higher than ambient, my Intercooler really sucks. Really would like to do a power run on a dyno but been real busy with work, but I will try soon.

BluestreamDE

Pmas MAF sensor came in yesterday, bought from a guy off the 350z Facebook page. Today I tried to work out the new Maf table since the UpRev software's generic setting is wayy off and idle AFRs were started at high 18.0's and run pretty roughly. I will continue to test out later but for the time being, I will use the stock Maf for now.

BluestreamDE

Soo due to being an insomniac tonight, I decided to continue to work on my new MAF value table for my PMAS N2 MAF sensor. I found a cool excel spreadsheet off the webpage (http://www.pmas-maf.com/product/hpx-n2/) which I used to generate a rough base configuration in my tune. I adjusted it reflecting the 3 inch tube/housing and used the correction value of .489 to get my max dataword @ 5V a few shy of 65535. Later after work today I will adjust my tune with this and datalog my results!

BluestreamDE

Nothing really new to add. I am now running the PMAS successfully after many trial an errors. Scaling the Maf somewhat correctly was a big hurdle in my novice tuning capabilities but I got it done. Max voltage I'm seeing at redline is around 3.91-4.02v with 13.2-13.5psi

I also bought a used set of Stance Coilovers today after work so I will be switching from my Tein Lowering springs And I am waiting on some 12v toggle switches and 12 gauge wiring I ordered to complete the Water meth kit install so that will be finished soon.

BluestreamDE

Z is still alive. Finally Hooked up my Trunkmount meth injection kit and went on a test run last night. I am running full Methanol spray mixture and beforehand reduced my fuel compensation tables by 10% at WOT. The meth kit is a basic one that goes on full spray at a set PSI of 6 till redline. With no changes to timing I could definitely feel a difference in power with a 4th gear pull from 3k to redline into 5th. Even though my WOT AFRs were richer at .73 lambda, I knew with just cooler AITs alone I was making good gains and no knock/detonation at all on the log. I still need to fix the fuel tables to have more of a steady Lambda of .78 to .76 at redline cause it was a bit jumpy.

I still am trying to do a power run on a dyno and show where I am at on WHP, my friend with an Evo is at 390whp and he said my Z pulled way harder than his car.

BluestreamDE

Tis the season to be jolly, KNOCK KNOCK KNOCK KNOCK KNOCK, KNOCK KNOCK KNOCK KNOCK!


I've been running this motor pretty hard tuning as much as I can with data logging street runs and was eventually running a full .79 Lambda reading which is 11.8afr at WOT with 13.8 lbs of boost at redline and full methanol injection spray with 21° to 18° advance timing on my street tune. This car was pulling soo insane with no knock it wasn't even funny, with wheels pin on the top of third gear (I'm running 3.9 gears), but even with soo much care and caution with this car with making sure I keep the 3k oil change intervals and fluids, the Z gave up the ghost on Friday last week. I spun a rod bearing on the 5th cylinder and the poor Z is now a woodpecker. Good news is that this car is now going to be a full build now as a Christmas present to myself lol.

Going with a short block rebuild with the following:

New short block assy w/ OEM Crank & Rod bearings
High Comp 11.1 Wiesco CP pistons (.020 overbore)
Eagle Rods
APR Head Bolts
OEM Revup oil pump
More boost with the 2.87 pulley
More Methanol spray w/ larger CM10 or 14 nozzle

I would go E85 but I don't have many stations that's relatively convenient so I'm sticking to Meth as it has been great for me soo far. Short block is already paid for and was told it would take about a week to get to my house.

OldManZ350

iTrader: (23)

sorry to here about your motor......

BluestreamDE

Yea it sucks but I know it was not due to to bad tuning. I bought this car at 92k miles and who knows how much abuse it saw before I got it.

I actually happy and very excited since I don't see too much High Compression Vortech builds here with actual results and dyno numbers. Now i am able to dive into this and share with the forum on my gains. Long as my octane rating is high and timing is generous and not overly advanced, I will be fine using higher than stock compression, and with the Methanol Injection setup I have along with the 93 octane in my area I should be ok.

The shop that is doing the shortblock rebuild, Longtubes header and clutch install is High PSI Performance in Hawker Heights, TX.

BluestreamDE

Some teaser shots before bringing the car to the shop.

meanz

iTrader: (23)

Good luck on the build. Just got mine back together. So far so good.

eZg

iTrader: (5)

You going to tune it yourself.......again

BluestreamDE

Yes after the motor is broken in, I will tune it myself. Not sure if it was a joke or not. When you learn how to do something you are obviously going to make mistakes and it's part of the overall learning experience. I want to understand how to tune properly and I want to be able to do it myself. The motor did not spin a rod bearing due to bad tuning.

eZg

iTrader: (5)

not a slam at all....was curious

I'm sure you will enjoy the higher power levels the forged internals make possible.

BluestreamDE

Just to update on my Z, the motor is out of the car. The ARP Head bolts came in but were still waiting on the engine rebuild gasket set and Revup oil pump that should be coming in today. Also since the motor was out, it was brought up by the shop owner that I should do a new clutch as well while we wait for the heads to be machined. So I am looking now for options, preferably a stage 2 at least.