Not Happy At All

[lcy]

Hi ppl,

I reckon others have the simillar problem aswell and would like to know what have you done to solve it.

Upgraded my turbo to a gt30 with all the supporting mods.

Tune by a reputable tuner in WA.

Was told by the tuner it was a safe tune with 350rwhp at 1.1bar. Not extreme for a rb25det neo. Very happy with the car, no complains etc etc.

Problem started after a couple of days. Engine light keeps blinking. Brought it back for a check n retune ( was told the timing was drop).

Still boosting 1.1 bar. Engine light no longer pops out. Not sure whats the current power output but was over took by a evo 6.5 with exhaust only.

Recently i can hear the car pinging if i am not mistaken while full boost kicks in even with low boost setting (10psi).

Will bring the car back on Monday to see how it goes.

BUT would like some genuine opinion on what to do, not some lame/irrelavent answers please.

Thanks in advance.

[mitchy_]

what ecu is it?

have you got a copy of the dyno sheet? what are the AFR's like?

[lcy]

Power FC.

Yea i have the dyno sheet but not sure if i have the AFR reading.

[mitchy_]

take it back to the workshop who tuned it, and tell them you think it might be pinging, and would like to know what the AFR's are like

[lcy]

Asking a noob question rite now.

Whats the AFR should be like with the current mods.

[inthisglass]

AFR = air fuel ratio

[mitchy_]

they should dip to around 12 when on boost, and a bit higher off boost.

this is the dyno sheet of the car i just bought.. it probably runs a bit too rich, but its safe..

[unique1]

dont forget timing, alot of shops love a lot of ign timing at top end and think because its running safe afr's it will be fine.

[mitchy_]

the PFC will flash the engine light when it reads knock over a certain level.. so they may have pulled a bit of timing out, but you can also change the knock level the engine light flashes at too..

if you think its still pinging, they might have just bumped up that figure..

either way, speak to the workshop about it, they SHOULD help you..

[R32 Driver]

better question is who tuned it?

[GTS-t VSPEC]

Either not enough fuel, or too much timing. I assume you've changed your fuel pump in order to get to this power output ? If you've got the PFC hand-controller then just drop a couple degree's of timing out yourself, and see if it's still pinging, the change will only last till you turn off the car, so will be a quick test whether timing is the issue.

[Tezzah]

they should dip to around 12 when on boost, and a bit higher off boost.

this is the dyno sheet of the car i just bought.. it probably runs a bit too rich, but its safe..

On a side note, if people are wondering "why is it so rich in the middle there?" thats because detonation occurs from two things, torque and load. Naturally mitchy's car will be making peak torque right where they richen'd it up a bit for safety.

[Char]

spark plug gaps?

Edited February 1, 2009 by Char

[lcy]

Ok people, my mistake for not listing my mods as some people are asking me what mods have i done.

Engine rb25det neo (stock unopened, comp test 165x3 170x3)

hks gt3037 56T A/R:0.68

HKS intercooler

splitfire coilpack

apexi filter

ngk spark plugs ( 6 sets changed, iriway 6 7 8, platinums) still misfiring.

z32 afm

tomei fuel pump

sard 650cc injectors

sard fpr

power fc

avcr

***serviced insanely for no apparent reason when i feel the Car is feeling down or sad( lol OCD) never go unservice for 3 months.

Weekend car (drives 2-3 times a week). All items are brand new and when it comes to the labour, i reckon i paid way more for tuning and fitting the parts plus the car was at the shops for 2 weeks(installation + tuning). Just want it all to be done properly.

better question is who tuned it?

Can i post who tune it on a public forum?? Might scar their company's image?

the PFC will flash the engine light when it reads knock over a certain level.. so they may have pulled a bit of timing out, but you can also change the knock level the engine light flashes at too..

if you think its still pinging, they might have just bumped up that figure..

either way, speak to the workshop about it, they SHOULD help you..

Yes i have spoken to them and the pulled off some timing and say it should be all good. They shouldnt have bump up the figures as i have brought it back to check on the tune after the engine keeps blinking. Shouldnt they drop the power figures and timing just to be safe?

Either not enough fuel, or too much timing. I assume you've changed your fuel pump in order to get to this power output ? If you've got the PFC hand-controller then just drop a couple degree's of timing out yourself, and see if it's still pinging, the change will only last till you turn off the car, so will be a quick test whether timing is the issue.

Brand new tomei fuel pump+ 98fuel only. Will bring it in again on monday first b4 i accidentally mess up some stuff.

spark plug gaps?

Have not regap the spark plugs but i am also having misfiring problems even after changing to splitfires+ 6 new sets of spark plugs.

***additional information for people who is waiting to ask if i abuse the car.

Edited February 1, 2009 by lcy

[R33_NICK]

Have not regap the spark plugs but i am also having misfiring problems even after changing to splitfires+ 6 new sets of spark plugs.

***additional information for people who is waiting to ask if i abuse the car.

if the coils and spark plugs didnt help stop it from misfiring, could be your coilpack wiring harness thats worn. its something most people never really thought about changing and its starting to be the major cause of misfires due to its age and exposure to engine bay heat for that long.

[GTS-t VSPEC]

The load on a dyno compared to the load on the road is different, so I'm sure it wouldn't have been hitting the "Check Engine light" knock limit whilst they were tuning it. Once the timing is taken out then you shouldn't have many issues.

Personally I'd throw away your platinum plugs and put in BCP6ES plugs, and gap them down to 0.8m or even less depending on boost.

[Tezzah]

The load on a dyno compared to the load on the road is different, so I'm sure it wouldn't have been hitting the "Check Engine light" knock limit whilst they were tuning it. Once the timing is taken out then you shouldn't have many issues.

Personally I'd throw away your platinum plugs and put in BCP6ES plugs, and gap them down to 0.8m or even less depending on boost.

i have mine on 0.6mm

[bubba]

i have mine on 0.6mm

You have a lot higher compression though, most turbo'd people shouldn't need to go lower than 0.8mm.

[Tezzah]

You have a lot higher compression though, most turbo'd people shouldn't need to go lower than 0.8mm.

Perhaps, sounds logical =)

[lcy]

Hi ppl

some update,

Not sure if this afr chart is the first tune or the second one after telling the tuner the engine light keeps blinking.

Tuner says he cant do much right now as my car is misfiring. SO he cant properly tune the car. (He has check the car twice on the dyno, which the misfiring doesnt occur when its in the dyno. Misfiring occurs only on the road - he cant explain why many factors that can cause it)

After getting the car back, the engine light is coming out during low boost.... this is the afr the gave me.

Have a look and let me know if its any good.

Heres the LINK to the graph...

http://img403.imageshack.us/img403/3000/afrgf2.png

Edited February 18, 2009 by lcy