Something like http://www.zippyshare.com/ ?

Links to the .dat files for anyone interested?

Phil's
http://www26.zippyshare.com/v/56633947/file.html
Dan's
http://www26.zippyshare.com/v/25646466/file.html
Jon's
http://www26.zippyshare.com/v/82015456/file.html

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

Fuel filter now fitted, so just need to fit the new tank with the uprated fuel pump.

Next day or so I guess?

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

Any idea why it is normally at the bottom?

I have seen this on a few downpipes but Toyota put theirs at the top, so I assume that is where they decided was the best place?

Or maybe, just cost saving with a shorted wire

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

The Toyota O2 sensor is narrowband not a wideband sensor. Not sure if that makes a difference? Also, the EGT at the bottom of the downpipe is only about 500deg C.

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Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Wideband are a bit more delicate than the on off narrowband sensor. And a pooh load more expensive until recently. It just makes.sense to give them an easier life and the bottom of the dp is as good a location as any

Still none the wiser on what's up with the car. The map has more timing than the default Apexi map, similar fuel but makes less power. All I van think is the fuel system is struggling at high load but the engine can't breathe well so the two balance out.

After upgrading the fuel pump I think I would whip the cambelt cover off to check cam timing

Thanks for the advice.

Cam timing and ignition timing need to be ruled out.

I also will check all the sensors and see if anything is amiss.

Drives great with stock ECU though.

Did hit fuel cut on track on Saturday though, as did Dan, so boost backed off a tad now.

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

Hi

What are your intake temperatures like?
As measured on the Commander?

Stephen

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1993 Carlos Sainz 2939, Forged, Apexi RX6B turbo with external wastegate. MOTEC M4, AFPR and 800cc injects. 3" exhaust, +1mm valves.ST205 cams. Rays 8.5" x 17". 205 rear subframe. Bilstein coilovers. 205 brakes.TRD diff

The early gt4s had unheated o2 sensors so the location may be historical.

Re breathing. I did notice your cold air box was fairly tight to the filter and had flexible sides which may be sucking inwards at high flow. Was this present on the rr day with the standard ecu?

If you alter anything which may improve breathing don't run the pfc until you have a wideband to verify it doesn't run weak at the top.

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If at first you don't suck seed, try drier grain.

Things have been a bit slow but moving on.

Replacement fuel tank fitted this weekend, with uprated pump feeding stock ECU at present.

Ignition timing checked OK.
O2 sensor tested and it looked a bit lazy which is normal with age?

Cheers Darryl.

New one ordered from TCB and should be here tomorrow.

AEM Wideband AFR should be here tomorrow as well.

I have no idea what the de-cat downpipe is made of, Stainless or mild steel, (magnet test?) but I need to fit a bung for the sensor and the AFR comes with a mild steel bung.

Can this be mig welded if the down pipe is Stainless?

Should be able to then refit the Apexi ECU and see what is what.

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

You can but the joint will rust of course.

Had this done as a quick repair on the manifold on my old Westfield.

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GT4DC Events Co-ordinator
1996 ST205 UK

Yes, you can mig weld stainless as if it's mild.

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If at first you don't suck seed, try drier grain.

OK, got a stainless boss and stainless mig wire for the AFR sensor.


My pipe is decat.

I was planning to put it where the yellow dot is a bit towards the front to allow a bit of cooling and far enough down to not overheat?

It will also allow it to sit pointing down a bit as recommended.

It is difficult to see from the picture, but the pipe slopes top left to bottom right when looking from the front.

This pipe is split half way down where the exhaust clamp is, so should not be to bad to remove the bottom section?




Does that seem an OK location?

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)

I would say put it on the opposite side but that general location is fine

The only reason I say that is you can then tie the sensor harness to the main engine loom over the Cambelt cover for a neat appearance plus you keep wiring away from under the turbo where it is bound to get a bit warm

The instructions say the sensor should point down by about 10 degrees to allow condensation to run off when cold.

Putting it where the dot is allows a few degrees of down tilt

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[color=#000080]ST205 WRC 1994
Hybrid turbo
Apexi AVC-R
Apexi Power FC (Not being used ATM)
Apexi Power commander (Not being used ATM)