Jump to content
SAU Community

Recommended Posts

After reading few more posts regarding this problem. Ive decided to turf out my $30 pod, possibily a oiled one and going back to the stock air box. Im certain that by going back to the stock air box our problem will disapear due to the air resude on the afm clogging our boost levels, maybe. Anyone given it a go please post results.

If not i need to take it to someone for a timing adjustment as ive heard advance it to 15+ and it should disappear.

otherwise coils packs next week, damn.

will post results.

cheers

ak

  • Replies 72
  • Created
  • Last Reply

Top Posters In This Topic

Max GT its your computer (ECU) Auto skylines have a different and more conservative program and a link to the auto trans computer that will retard ignition timing sooner than a manual and perform a fuel cut sooner at higher boost levels. This has been a big problem for me for 12 months! Anyway I bit the bullet and tried a modified manual computer.... and YEAH BABY YEAH!! now i'm running 1 bar boost and have to be careful changing to second because there is no rev cut now so savage gear changes are all the go. Also if your going to try this, then make sure to get a dyno tune afterwards to be sure.

Strich9ine i don't know if this helps buddy but if your car is a manual and a series 2 and you want some split fire coil packs then drop J-SPEC a line. [email protected] They have a new set collecting dust in the office! it also wouldn't hurt to try a mates ECU. the ecu in mine caused all sorts of problems in the previous car and we tried every thing to no avail just to find that it was the ECU. Hope this helps guys. Have a nice day. :(

well im not sure about that website above but im gona buy some injector cleaner whatever is expensive and see what happens maybe a clogged injector could be the cause but most likely its the coils.

does anyone know where the vvt thing is?

cheers

ak

ive got a gts pillarless r31, runin the niccs rb20det and im havin the same prob! as son as i put the new 3 inche exhaust form turbo , i was get missfires at about 4-6 grand, very anoying at times! ill try cleaning injectors, getin a full tune up, and adjustment of the afm, hopefuly i fix the prob =/

sky^rkt

Chances are that your ECU is responsible for the missfire, when you fitted the exhaust you removed a restriction from your engine allowing it to boost more, the factory ECU could be retarding your timing and or cutting your fuel, you may also find the problem to be more pronounced when the air is cold in the morning or at night. Are you still running stock boost?

Well, after your tune you'll have more of an idea of what it isn't. these things are usually not fixed easily, the more information you can give about the conditions when the missfire happens the better. Also, nissans run different parameters when the engine is cold, this is to protect the engine. you should avoid caning until the temp gauge reaches normal operating temperature. I found i had less missfiring problems when the engine was cold but when the engine warmed up and the air was cold outside misfiring was more pronounced. Good luck

yeh, i was told just to try it when it was cold to see if it wuld happen and it didnt, i always let the car warm up to opertating temp, probably in the next week or so ill get a full service of everythign and see what hapens form there, i appreciate the help guys thanx heaps!

My nics has a simular problem it tends to misfire & be laggy while cruising when cold, as soon as the motor warms up and the temp needle hits the fist line on the gauge it takes off and is fine. I have, changed ECU temp censor, O2 Sensor, just had the AFM Calibrated wich fixed my over fueling problem as some one had dicked with it and was way out. I have just replaced my ECU and it seems to not be laggy when cold but splutters a bit more when cold but can put that down to still learning. this has been a quest over the last 12 months and will not be happy until it purs.

Well guys told you i would keep you posted on the remedy for our poping in RB25s. Ive been told possible problems coils, ignitor module, pod etc. Well i went to autobarn in my area(sunshine), ask the guy if he had a really good injector cleaner thinking i might have an injector problem. Well he said try Pro Strength Octane Booster (NULON) for $20. The reason he told me was it cleans the bad deposits on the injectors, increases performances and horsepower. Well once the octane boost kicked in any car on the road will have no chance. It holds boost and keeps on boosting.

Hope it fixes your guys problem, fixed mine; touch wood.

Cheers

AK

Another interesting point is that japanese fuel is better octane than any aussie fuel, so an octane booster may fix the problem but if it comes back next tank of fuel then altering the timing, as has been suggested, would be a better long term solution.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • How's everyone going? Just a shout-out introducing myself. I'm James, I live on the north side of Brisbane. I bought an R33 that had been left to rot in someone's front yard for 14 years. Apparently, it has immobiliser/fuel issues. Long story short, it's suffering from a seized engine, plus whatever else turns up once it runs. The car is pretty good considering it sat for so long. It pretty much died after being imported. It has a bunch of Jap parts and a full Top Secret body kit. It's painted Fiat Turchese Festival, or aqua blue if you're not French. Another project to throw money at!
    • So the clockspring is responsible for the indicators cancelling on their own? I thought that was the function of that white thing in the center (any idea what it's called?)
    • Can you log IAT? Whilst WTA coolers have their place, doing any sort of sustained run is not one of them There are fixes that slow down the heat soak, like ice boxes, which don't last that long, and interchillers, which are fairly expensive, up grades to the WTA cooling radiator, which may require a bigger pump, and upgrades to the reservoir size,  and upgrades to the cooling fans, but, it all still heat soaks, and takes ages to come down in hot weather  For a turbo, that isn't locked into WTA like my PD blower is, can you not possibly swap to a nice air to air intercooler????, it would be better for sustained runs then, and have alot less things that could go wrong in my opinion 
    • So, the other thing I've sorted is a baseline dyno run up at Unigroup's new location. The auto trans was a little unco-operative by both shifting down when the throttle was floored on the dyno (so Mark had to ramp it up more slowly than in a manual) and also by shifting up at 6,000 even in sports mode instead of the indicated redline of 7,000 Still, on a hot day it made 240rwkw at 16psi which seems about right for 300kw (400hp) through an auto at the wheels.  The shape of the curve is not quite right because it was not full throttle to about 4,500 to stop it kicking down, but until I can get a tune on the auto trans control this was the best we could do.....full boost will be well below 5,000 once that is sorted, I'll get some data logs when I can to confirm For comparison, the R32 made 255 at 12psi (at 4,500) on the same dyno with tune, n1 turbos, cam gears, big exhaust but otherwise all standard so the v37 is likely a little better out of the box. One thing that is very clear is that the standard water to air intercoolers are not up to sustained use at full throttle in warm ambient temps. After about 5 runs (so only a few minutes full throttle), it was pulling boost and timing and dropping 10-15% power. Unfortunately I didn't get that printout and the Unigroup guys are away at the moment, will try and get hold of it on their return. So, looks like a healthy engine to start modifying and the only real area of concern is the w2a heat exchangers which the aftermarket has plenty of solutions for    
    • I maintain it actually looked really nice in person. So much so that I thought "No, this is illegal" but there it was, clear as day. I think we can easily call the wing and wheels/height to be transformative. Not saying it's better than the GR Whatever, or the 86, or the WRX STI or anything of that sort (the internet says it all bolts up so you can buy best of all worlds?) but it's still at least a thing and not nearly AS bad as people say.
×
×
  • Create New...