car getting slower

4GTuner

Help Support 4GTuner:

have you taken it for a drive? listen for pinging?

Could it be your AFM is playing up giving incorrect Airflow reading?

I would take it for a drive.. listen for pinging.. you will know it when you hear it.

Adjust your mixture screw to bring idle back to normal or adjust your TPS.
 
im pretty sure its pinging like above 6k rpm, thats when i hear it..
besides then it sounds fresh as.. so i dont rev it up to that obviously..
just when i gave it the slightest rev i was like wow the little notch just ran away like no tomorow..
it shouldnt be doiing that right? it should stay like around 7-8?
matt
 
yeh man all of the above.. i set it to 5 with the plug grounded
it was about 7-8 without it grounded
thats normal yeh, but when i rev it goes off the charts?
anyone heard of such a thing?
 
I cant comment on how far advanced the timing should go when its free revving.. Never really checked it. But i don't see it as being abnormal.

I would have kept the 510cc injectors in the car personally... but the stock ones should not be leaning out.

How much boost? If you keep it on 1 - 2psi past 6krpm does it ping? Does it ping on heavy accel before 6k?
 
You seem to be chopping and changing your setup all the time....??

Can you give us an EXACT list of your mods, and emphasise on the fuel injectors, regulator, pump, chip, afm, boost etc


Believe it or not, sometimes after you get your car back on the road after a whole bunch of mods, you get used to the boost etc, and after a while it doesnt feel as fast as when you first jumped in it.
 
its basically in a nutshell.
sotck vr4 engine with only cams upgraded.
stock afm, injectors boost etc.
i know ive gotten used to it a bit but still its not running correct..
im just wondering if on free rev it does advance like 30 degrees btdc which i just cant seem to get my head around it would be doing that?
and its a stock ggsr fuel pump with vr4 reg, rockabilly said he has teested and ggsr pump flows good up to 15psi with vr4 reg so thats not the problem./
 
How much boost are you running?

I saw up to 40 degrees advanced on my old GGSR turbo.


Have you done an intake leak test? Don't take this the wrong way, but your piping looks a bit dodgy:

r0015067wc3.jpg
 
lol ahah, thanks, nah my piping is a bit dodgy, but from the stock cold side pipe is now all welded so its a 2 piece cold side pipe and same with the hot side aswell..
so there aint any leaks im sure of that, besides the leaking bov i had..
could it be my ecu?
just a stab cause the guy i bought my engine etc off, was a dodgy cunt, thats the least i could say about him..
 
mattrat said:
lol ahah, thanks, nah my piping is a bit dodgy, but from the stock cold side pipe is now all welded so its a 2 piece cold side pipe and same with the hot side aswell..
so there aint any leaks im sure of that, besides the leaking bov i had..
could it be my ecu?
just a stab cause the guy i bought my engine etc off, was a dodgy SOGGY MOCCASSIN, thats the least i could say about him..
Click to expand...


What ECU do you have?? Turbo? exhaust? cat? intake?
 
stock vr4 engine man, so 14b, md810 eprom ecu, stock vr4 afm, and high flow cat from my old 2 1/4 exhaust
 
I honestly think this car/engine has been played with so much dignosing a problem with it over the net is near impossible. Nothing is how it was form factory, so it could be anything.

Matt, the timing changes when your Revs climb. If it stayed at 5d BTDC then when your doing 6,000rpm the engine would have like rotated twice by the time the first spark is shot. (I obviously know that figure isn't correct, I'm just tyring to explain to him)

So the timing will move much further BTDC to make sure there is always spark at the right compression moment. So if you set it properly to 5d BTDC with the plug earthed, engine warm and idling, then your timing should be ok...assuming your belt timing is correct.
 
hey Dre. Might run rich. But what cams is he running? might not make it run that rich.. if he is running more boost etc, and AFM has been tampered with. We dont know what else is done.. So it may have run better with the slightly bigger injectors..
 
iluszn said:
hey Dre. Might run rich. But what cams is he running? might not make it run that rich.. if he is running more boost etc, and AFM has been tampered with. We dont know what else is done.. So it may have run better with the slightly bigger injectors..
Click to expand...


AFAIK its stock- larger injectors with no compensation will make it run hella rich, like it did before he went back to 450's.


You really need to find out EXACTLY what you're running matt, because it could be something simple. A datalogger would help aswell. Maybe you're getting phantom knock?

Do you still have 3 ECU's? Have you tried swapping one out?? What fuel are you using?
 
ooppss.. didnt realize i copied the main link..

Any update on the car? Does it ping above 6k off boost? What boost are you running? Is your AFM working ok? all plugs checked etc etc etc. No other vacuum leaks?
 
ok well just to clear it up.
timing ise, itf it looked like 30 or so degrees btdc at like 3.5-3k rpm then id hate to see it at 7k, why im saying this is cause i read somewhere that like idle is like 7-8 egrees and WOT is about 15-16.. now i get what your trying to say but spark is relative to piston placement so 5 degrees at any engine speed will still be sparked in the same position.
i dont think its anything to do with a fuel problem but i cant seem to get my datalogger to read, both pin diagrams i have looked at show the ecu diag pin is the same, so it should be reaching the diag port, but the pins im supposed o connect to dont do anything,
would anyone care in just explaining the actull process of connecting it, ie is the car started or everythings off while connected? i may be doing something wrong.
regards to illuzns post i might try the off boost and see what happens, also im running 7-8 psi sometimes spikes to 10 or so. I suppose afm working but a datalogger would help there too? i think i might have a big day cleaning up the car and see if anything changes..
Matt
 

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