03SR5

Hey guys,

The truck is an 03 Toyota Hilux (Tacoma) with the 3.4L 5VZ, 130,000kms on the clock (80,000miles) and the following specs:

TRD supercharger
7th injector kit
2 step colder plugs
Extractors + full exhaust
Custom intake with K&N drop in filter
Bigger pump
Haltech E11V2 Standalone Engine management

A lot more info can be found here:
www.customtacos.com/forum/showthread.php?t=117279

To cut a long story short, we have tried and checked virtually everything (A/F, timing, plugs etc etc), and are still unable to tune the ping out of the truck.

So a 2mm Cometic head gasket has been ordered which is said to reduce the comp ratio by approx 0.5-0.75.

My question is

a) Do you think this will solve the problem

b) Rather than just installing the head gasket, to ensure that I don’t run into this same problem again should I have the engine rebuilt/reconditioned? If so, what would sort of rebuild should I do? (i.e. have it all balanced and rebuilt to std specs, but maybe with some ARIAS pistons??)

Any opinions would be appreciated, as I really want to solve this problem and be able to drive the truck like it should be driven!


Ross

toy power

A) no
B)Arias pistons in a 3.4? thats a joke. Rebuilding the engine will not solve the problem, unless it is severely severely worn; the only way worn engine parts could contribute to detonation is if there was a massive quantity of oil getting into the combustion chamber... unlikely but do a leakdown test. Assuming that is good, you definitely have a problem with either the fuel or spark delivery... my guess is spark. I briefly read the thread you linked, and I think since it is running strong in higher rpms it is unlikely you have insufficient injector volume... The problem is almost definitely in the computer's mapping of the fuel and timing curve. I have no earthly idea about that computer you are running. If you can pull your fuel and spark maps onto a laptop that would go a long way in diagnosing the prob.

03SR5

Thanks for the reply! Definately gives me a different insight as to what the problem could be...

The only logical explanation that we have been able to come up with is that there may have been a slight imperfection when the engine was originally manufactured, and it was now being highlighted by the extra heat generated by the SC??

I'll definately try get some maps for you.

As for the ARIAS pistons, I just saw them here https://www.yotatech.com/forums/f37/...istons-113844/ and gathered thats what most of the built 5VZ's were running??

904_runner

Did it come stock with the supercharger? Was it added after?

Not sure, but are you/arn't you supposed to run premium fuel with the supercharger?

Just trying to help someone narrow it down.

03SR5

.....

03SR5

Regarding the computer, you can find some specs here: http://haltech.com.au/e11v2.htm

olharleyman

Affirmative that is a must

904_runner

so without it wouldn't that cause pinging?

03SR5

Supercharger was only added approx 5,000Kms ago, and the truck has been run on Premium fuel since day one.


The car has quite a severe misfire in the rev range that it pings... Would this also indicate a problem with spark?

olharleyman

Try U.R.D. they have a piggyback that will help as well.

03SR5

That was the first ECU that we tried.

Had no success with that, so we thought the more advanced Haltech ECU would help. Unfortunately it did not!

olharleyman

Wow do you have the bigger injectors as well?

NwRunner

have you tried taking the belt of the supercharger and running the car to see if the pinging is comming from the supercharger itself?

toy power

Ok, i read up on your computer through the link. I have never used one, but the description sounds awesome. According to the site, you can alter your fuel and spark mapping as the engine is running and you are also able to log lots of data from the computer... pretty cool stuff. So now that I know it is programmable, the big question is... have you changed the mapping at all??? Just like several other programmable ecu's, they send you the computer with a fuel and spark map that will allow your engine to start, but thats about it... as the website says:

* Please note that base maps have very simple fuel and ignition maps that are intended to help start your engine only. They are not to be used for engines that will have any load applied. Engines driven on these maps may be damaged as a result. Haltech Engine management systems takes no responsibility for engine damage as a result of misusing the provided base maps.

So...have you just left the computer's programming alone so far?

03SR5

Oh heck no!

Have had it on the dyno for quite a few hours now.. (not me tuning though, I wouldnt know where to start)

From memory its running as much as 6 degrees of timing retard when it pings...

Ive got some logs here that Im trying to upload for you to see..

mt_goat

I know a lot of this may not apply to you since you're using that stand alone ECU, but read this over and pay special attention to the section that starts on page 24 regarding the difference between "spark knock" and "detonation".
http://www.gadgetonline.com/U-Tune.pdf

EDIT:
I mentioned this to you before, but I still think I'd ditch the standalone ECU and go back to the Toyota ECU which uses knock sensors to adjust the timing. Here's a quote from the link above:

Quote:

The ECU will always try to run the ignition timing as advanced as possible. It will
keep advancing it until it sees some knock from the knock sensors and then pull
the timing back until it stops, then it will start advancing it again until it knocks
and so on. This process is going on constantly and it is dynamic meaning it is
always self-adjusting. The ECU will always try to keep the ignition timing at the
knock threshold above 3000 RPM. However, due to the high mechanical noise
of the engine and its solid lifters the knock sensors are NOT used below 3000
RPM to adjust the ignition timing. Ignition timing below 3000 RPM is set by the
ECU based on an extrapolation of the high RPM ignition timing.

naksukow

I would ditch the 7th injector and get the full fuel system from URD.
I would stay with the standalone.
Tune with some race gas.
Are you guys pulling the plugs after each run to read them?
I would go more conservative on the AFRs untill you fix the pinging problems.

mastacox

Have you checked the idle timing advance and compared it against what the standalone system is reporting? It's possible your timing advance is farther forward than you think, possibly due to a sensing problem...

03SR5

Ok I have some of the fuel/ignition maps, however i have no idea how to use the Haltech software.

Anyone willing to have a go at it? I can email you the files, and all of the software is available to download from http://haltech.com.au/downloads.htm

Texas_Ace

To me it sounds like you are either running low oct gas or spark is not retarded enough.

Like was suggested above check the actual timing with a timing light and see where it stands.