ping after psi bump up?!?!

[maccaz_gts25t]

i have a gtst 1995 r33

i have recently put the boost to around 10psi, added a blitz pod filter, and had a tune aswell. it is the stock turbo etc

when i dump it really misses and ping and it just feels like the engine is missing

i have been told it is the stock fuel pump not being able to cope with the amount of fuel intake required

is it true

please help!!!!

[caminperth]

Pinging is bad and engine destroying - it happens very quickly so don't "dump" it until you either reduce the boost or fix the problem. Means that not enough fuel is getting there as the stock cooler "should" be ok with that sort of boost, so points at the fuel pump or regulator or injectors.

I think..

[Cubes]

Stock fuel pumps are getting fairly old these days, its either that or some ones played with the ignition timing.

Time for a newy.

[justin911]

lemi us know what it turns out to be

thanks

[maccaz_gts25t]

yeh usually the stock fuel pumps can handle up to 14 or less, so ill get the timing looked at...CUBES what do you mean by time for a newy...hahah oh ooo

[Cubes]

New stock fuel pumps can handle quite a bit of power.

10yr old ones can't though.

Mine began leaning out with 150rwkw at 12psi of boost on the stock rb20det turbo.

[maccaz_gts25t]

ahh k. is there much difference if any with the rb20det and the rb25det fuel pumps.

my mechanic is looking at it tonight and i will let ya ll know how it goes. how much can i get a fuel pump for....i would want one that can hold up to 550hp just so then i have alot more abilty than it actually needs

[TommO]

I bought a Walbro fuel pump for $230. There's cheaper options out there, but you'll have to wait.

Are you SURE it's not just missing, do you actually hear it ping? You said you had a "tune", did this involve putting it on the dyno and watching the AFRs?

If it's just missing, it's most likely that your plugs need re-gapping to a lower spec (ie 0.8mm instead of 1.1mm), due to the higher boost. Could also be a coil pack is on the way out.

[maccaz_gts25t]

thanks for that....i have herd it ping but the missing is chronic....like sometimes it sounds like a slow machine gun wen dumping it....like bupbupbupbup with miss's in between bup's

if that makes sence haha but thanx for that mate

yeh i herd that walbro are quality the $230 one...how much could that handle, what where the specs, and does any one know the specs of the stock standard 1995 r33 gts-t fuel pump.

[TommO]

Yep, that slow machine gun is defintely pinging. If it's audible like that, it's pinging very very badly. Turn the boost down!!

Not sure on how much the Walbro or Bosch intanks can handle, but they are quoted at about 500HP... lots of people on here with 250kw at the rears plus still only have intank replacements, so they'll support plenty of power :)

[maccaz_gts25t]

my mechanic mate just picked it up a few hours ago to take it to his and retune it and turn the ignition timing down hoping that will stop it...its only at 10psi and i know people with it at 14 in the same situation but not pinging, but i still got more power than them cause they have idiots tuning there timing etc hehehe....been a big help cheers mate.

[maccaz_gts25t]

orright maybe it wasnt pinging as bad as i thought.....but the main problem, the bleed valve is really cr*p. it is a TURBOXS boost controler, and 4 out of 4 car weary people said there bad news

[TommO]

So it was spiking boost, or running unlimited boost, or?

[siksII]

doesnt seem like pinging to me, as you have described it it sounds more like coilpacks.

[ecl]

i think its not pinging

does it sound more like a spluttering noise near the exhaust?

i have same prob and ive read its either spark plugs, coil packs, fuel filter, dirty afm hmm.

[Cool Hand Luke]

Pinging you will here a rattling or knocking sound coming from the engine bay, and wont cause a miss fire.

[maccaz_gts25t]

today it ran better, i was the bleed valve spiking, some runs would be at the 10psi rang then down to 5psi then next one suddenly at 15psi...i am changing the valve from a turboxs to a turbo smart, wise move?

[BezerkR32]

i have a gtst 1995 r33

i have recently put the boost to around 10psi, added a blitz pod filter, and had a tune aswell. it is the stock turbo etc

when i dump it really misses and ping and it just feels like the engine is missing

i have been told it is the stock fuel pump not being able to cope with the amount of fuel intake required

is it true

please help!!!!

I doubt it. Sounds like an ignition problem, but sometimes factory computer overcompinsates for increase in boost & richens mixture too much.

[TommO]

For you guys suggesting it's not pinging, tell me what this noise is

I reckon it's pinging AND missing personally.. as I said above. Pinging due to 15psi on stock cooler, and missing due to high boost and plugs not gapped to support it.

like sometimes it sounds like a slow machine gun wen dumping it....like bupbupbupbup with miss's in between bup's

[siksII]

coils!!!