Toyspeed.org.nz Message Board

by **sergei** » Thu Feb 02, 2006 8:21 am

Hi, I'm really annoyed at random boost cut @ ~10.5psi on my ST165, sometimes it does not happen for weeks, then in one morning it kicks in, a few times... I have electronic boost controller set for that value, the thing is that it can even kick in at 9 psi.
I understand why this happens, and in the future I will be changing ECU for the aftermarket unit.
What I want you to ask is if the facelift ECU (off ST165) will plug in straight into my preface lift loom. I've looked at the wiring diagram and the Turbo Pressure sensor connects to one of the wires from AFM, and does not have the separate ECU input. So I make a big assumption that face lift ECU will plug in to the prefacelift loom (I don't have wiring diagram for prefacelift to compare).

Thanks.

by **Malcolm** » Thu Feb 02, 2006 10:08 am

Wayne has a facelift and it has exactly the same load based fuel cut as you have. Seems to be that export models were the ones that had the map sensor. Maybe you should look at installing a gen 2 ecu?

by **sergei** » Thu Feb 02, 2006 11:57 am

Thanks All_Fours, has anyone told you that you are very helpfull arround here?

Hmm, this is interesting, probably it will be much easier to get gen2 ECU as well, any one know how different it is from gen1 (plug wise, as it is pretty easy to swap wires arround if necessary)?

by **sergei** » Thu Feb 02, 2006 2:17 pm

I've looked at the ECU pin outs and ST165 and ST185 have colmpetely different plugs (10,18,24 vs 14,22,26)... so if I will have to get ECU for it I will need to get the plugs as well.
Other question if the 165 and 185 uses the same airflow meter and if other sensors are interchangable?

by **Adydas** » Thu Feb 02, 2006 4:54 pm

i have a spare Gen 2 ( I belive ) Ecu if u want to try dude.

by **Malcolm** » Thu Feb 02, 2006 6:28 pm

cliff - you have a spare gen 2 ecu and wayne hasn't pinched it yet?

Anyway I wired a st185 engine into a st165 last year, it was fairly straighforward but took quite a while as I didn't have proper diagrams for either. Just swapping the ecu would make it a bit easier, I'm pretty sure there's enough similarities that the st165 loom could be used, the main differences I'm aware of between the two is that the st185 uses an intake air temp sensor in the AFM, the st165 has one in the intake manifold, and possibly uses the one in the AFM too since it doesn't have a map sensor

all you'd need to do for the map sensor would be to wire a couple of resistors onto the appropriate wires (since you want to get rid of boost cut).

by **sergei** » Thu Mar 23, 2006 12:40 am

Thanks guys for your input! I've just wired in BLITZ ST185 ECU (Thanks Mr Revhead!), infact I've noticed it goes way better on same boost then with st165 ecu.
BTW my ST165 did not had a cold start injector output, I think it is activated by thermoswitch on the water outlet...
I've got one more question: do ST185 have "TURBO" light? As obviously my new ecu does not have an output for it and the damn light is on all the time...

by **Malcolm** » Thu Mar 23, 2006 1:51 pm

no turbo light on st185, just the useless gauge

by **Boosted_162** » Thu Mar 23, 2006 8:56 pm

Dont lie Malcolm, you know that gauge is super dooper accurate

by **matt dunn** » Thu Mar 23, 2006 9:17 pm

Boosted_162 wrote:Dont lie Malcolm, you know that gauge is super dooper accurate

of course it is accurate.

It has no values marked on it so how can it be wrong?

by **Boosted_162** » Thu Mar 23, 2006 11:25 pm

I liked the fact that mine had just started moving, when my aftermarket one showed full boost :lol:

Website · by Si » Thu Mar 23, 2006 11:39 pm

is it correct that those factory fitted indash boost gauges (that use a sensor) read as fast as the MAP sensor the ECU uses?

by **sergei** » Fri Mar 24, 2006 9:17 am

Right now I'm boosting 0.9bar (~13PSI) but I don't have MAP sensor (turbocharger pressure sensor) connected, as I did not had the item.
I don't get boost cut or any engine lights (except 51, stupid AC code).
I might buy one of those wide band a/f ratio meters (proper guage with needle) to see what is really happening..

by **vvega** » Sat Mar 25, 2006 12:21 am

with no sensor you will boost cut at about 15psi

been there done that
i run anywhere up to 18 psi with no issues yet

but
then i also have a steel ct20b

v

by **sergei** » Sat Mar 25, 2006 1:46 am

I have BLITZ ecu, from what Warwick told me it has got higher boost cut, but he is not sure what value....
Will map sensor from turbo Legacy work? as I don't want to go hunting for a map sensor...
I will be using CT20b later on (next month or so)...

by **vvega** » Sat Mar 25, 2006 12:51 pm

any sensor from a turbo toyota will do the job
it just needs to see less than 4.4 v
hell i guess you could just stick a resister in there

v

by **sergei** » Sat Mar 25, 2006 3:24 pm

The thing is the loom on my ST165 already had PIM (turbocharger pressure sensor) wire going, and I had connected it to ST185 computer, I have no idea why ST165 prefacelift had it there and where it is connected (I fill try to trace it sometime), I don't have the wiring diagram for prefacelift...

by **vvega** » Sat Mar 25, 2006 6:02 pm

no the us pin diagrame you have says its pim
bit its atually manifold temp sensor

v

by **sergei** » Sat Mar 25, 2006 7:43 pm

Oh ok, I will measure the voltage on it and if it is more than 0v and less than 4.4v I will leave it in...

by **matt dunn** » Sat Mar 25, 2006 11:01 pm

FYI,

Diesil Turbo toyota map sensors (2C-TE, 1KZTE etc )have much lower outputs than the GZE's and MR2 turbos' etc etc,

but still have the same electrical connection.

Matt

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ST165 temporary ECU solution (load based boost cut)

ST165 temporary ECU solution (load based boost cut)

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