Engine Detonation :-(

[Pappu1]

lol for 200 i wud expect him to sort the det issue not just point it out

being a knowledgeable place they wud be much easily solve the issue in less time it takes to read this thread ;D

[Guest]

 Timmah said:

Did you change fuel pump at well??

I'm thinking that at the RPM level, it's detting because the ECU probably can't keep up with the larger amount of air being pushed in from the larger turbo.

right thread bro? didnt see a turbo upgrade anywhere here unless i missed it. might be the td06 thread...

[joshhorn16]

Quote from: Timmah on Today at 02:16:50 pmDid you change fuel pump at well??

I'm thinking that at the RPM level, it's detting because the ECU probably can't keep up with the larger amount of air being pushed in from the larger turbo.

right thread bro? didnt see a turbo upgrade anywhere here unless i missed it. might be the td06 thread...

he is right bro it has a td05h which is 550cfm vs the td04l 340cfm ie 2wice the power at the same boost i believe the answer to this could just be the fuel pump.

[Pappu1]

at 11psi i wud easily expect the v5 pump to keep up with the td05 .. maybe age of the pump and injectors running more DC causing it issues...

u can put on a v7 sti pump (which i have for 40 if u keen hehe)

they hold 18psi on a td06 tested

[Guest]

 joshhorn16 said:

Quote from: Timmah on Today at 02:16:50 pmDid you change fuel pump at well??

I'm thinking that at the RPM level, it's detting because the ECU probably can't keep up with the larger amount of air being pushed in from the larger turbo.

right thread bro? didnt see a turbo upgrade anywhere here unless i missed it. might be the td06 thread...

he is right bro it has a td05h which is 550cfm vs the td04l 340cfm ie 2wice the power at the same boost i believe the answer to this could just be the fuel pump.

i remember different thread you were asking about the actuator slipped my mind.

it is quite a differnce in turbo size for no tune but gary will know. i went from td04 to vf23 not as big a size difference but im running 14.5 too. according to subaru nz the fuel pumps between wrx and sti are the exact same pump just different injectors.

[joshhorn16]

i remember different thread you were asking about the actuator slipped my mind.

it is quite a differnce in turbo size for no tune but gary will know. i went from td04 to vf23 not as big a size difference but im running 14.5 too. according to subaru nz the fuel pumps between wrx and sti are the exact same pump just different injectors.

so what are you suggesting ?

[Guest]

if its a v5/6 it should have yellow injectors so no shortage there and fuel pump shouldnt be the problem unless its buggered. the early wrxs had td05s with the same fuel pump unsure what injectors.

edit: its v5 http://www.clubsub.org.nz/forum/index.php/topic,29359.msg404327.html#msg404327

[joshhorn16]

if i upped the fuel pump injectors and maf sensor then put a v5 sti ecu in it shuld work

[Guest]

afm is the same as sti too...same afm/injectors different turbo and J2 ecu with higher boost level 16psi stock from my research. difference in nz new to jdm ecus also i believe.

numbers off my import non sti v5 wagon A8

22611 AE491

A18-000

D0Y

SY26

[joshhorn16]

ah crap i just have a feeling its my fuel pump. how do i check that ?

[Guest]

get a friendly member closer to you to have a nosy. its on the drivers side by memory under the seat. the fuel pump may be slowly dying if you have jingles just go buy a walbro good for future mods or the v7 one off pappu.

[Johnnynz]

Fuel pump is in the boot, do a quick google on how to remove and you will find lots of helpful guides.

If you get stuck PM me I think I still have a few photos on how to do a Walbro install in a v5

[joshhorn16]

i am going to be buying a v7 fuel pump but can someone provide info how to test old one and i can just see if that is the problem

[STiNGR]

 joshhorn16 said:

i am going to be buying a v7 fuel pump but can someone provide info how to test old one and i can just see if that is the problem

I brought a V7 STi fuel pump for my V5/6 for $20 there is a few floating around on here. luxin88 got one for sale also, he's keen to move parts asap so hit him up for a deal...?

[Koom]

 evowrx said:

the early wrxs had td05s with the same fuel pump unsure what injectors.

They had grey injectors. But they were also tuned for that turbo. Quite likely that the later model engine with higher compression and tuned for the wee turbo can't cope with the TD05 just being chucked on it and hoped for the best.

[WRXONP]

why has no one suggested spark plugs?

what condition are the plugs and what plugs are they exactly?

i would go upto a heat range 7 NGK copper if it hasnt got them allready - as running a hotter plug just causes pre ignition (detonation)

theres a whole lot more to detonation than "BOOST" despite what alot of people think - could simply be the MAF - giving wrong values - i would highly suggest giving it a clean -

any idea what the air fuel ratio is ? did he run it on the dyno to hear the det or did he drive it? i would highly suggest gettting air fuel ratio checked with a wide band

if the detonation is bad enough to hear with human ears - its bad - really bad

to test fuel pump u really need a fuel pressure gauge plumbed in - if pump is bad pressure will drop off on full boost where it should hold 43.5 psi + 11 psi boost so 54.5 psi

[Stoffa]

I was asking about km's on the car. subarus are known for the power feed to the fuel pump degrading causing lower voltage, causing bad flow, not enough fuel=det.

[Stoffa]

If its the ecu causing the problem a poormans fix could be to up the fuel pressure a little with an adjustable fuel pressure reg......actually thinking about it the problem could just be a bung FPR.

[joshhorn16]

will have a check of the spark plugs this eveinging if i can i will also put the sti fuel pump in and i will see what happens. the guy could only hear it when he had the head phones on and he was driving on the road

[Guest]

when did it start detonating? before the boost tap got installed/after/before? if a problem rears its head straight after a mod its pretty easy to point blame.

[Kiwi_Fozze]

please bear in mind, there is a compression ratio difference between the wrx and sti models v5/v6, if changing ecu's this can and probably will cause issues....

[WRXONP]

the above is hear say i reckon - as to date i have not heard of someone actually running a higher comp non sti motor on a sti ecu ( ver 5-6 ) as i know and my old car is proof that a ver 3-4 wrx motor runs fine on a ver 3-4 sti ecu ( which is the same difference - being the sti lower comp than wrx)

anyway - thats not even a part of this convo is it??

the cars standard ecu isnt it?

was he running a knock block on it ? are u running the car on 98? when was fuel filter changed? easiest way to figure out if its a fuel related issue - get the air fuel ratio checked via wideband

[joshhorn16]

Umm the problem was before popped up the mod disapeared for a bit and then came back. who has a wideband sesor that will test the car.

[Guest]

did you get hold of gary? if its intermittent see if you can pin it back to a situation like only when cold/certain gears/slowly accelerating over 6k or hammer down.

[joshhorn16]

So spoke to gary and i he said he could hear it with specialised equipment at the 5500rpm upwards. i have also changed the fuel pump to v7 sti and it made about three kms difference so picking up new coils and leads on wednesday