New engine going in next week .

discopotato03 · Post by **discopotato03** » Mon Aug 10, 2009 8:06 pm

Your was a later 4 plug hotwire system wasn't it Gannon ?

Cheers A .

Gannon · Post by **Gannon** » Mon Aug 10, 2009 8:23 pm

Yeah sure was.

But i dont see how that would make much difference, there are no differences in the engine or ignition system on the HT side of the coil.

discopotato03 · Post by **discopotato03** » Mon Aug 10, 2009 11:42 pm

Well RB30's were used in VL Commodes and R31 Skylines , same engine different plugs - resistor/nor resistor .

I think in this case from what I can find all MPFI EA82T's use NGK BPR6ESII , II meaning wide gap ie 1.1mm / 43 thou .
Actually I seem to remember the old engine liking the gaps closed up to ~ 25-30 thou . I'll have a look tomorrow .

Cheers A .

steptoe · Post by **steptoe** » Tue Aug 11, 2009 11:04 am

From the 85,86 manual Discovered only yesterday when ordering genuine coil that my 3/87 comp date beast is actually 86 model as in the B in BROB vin, first B, second is turbo (yeah!)

Replace the spark plugs at 12,500km intervals - so every oil change.

EUROPE:BPR7ES, BPR7E

AUSTRALIA: BP6ES, BPR6ES, BP6ES-11

EXCEPT ABOVE: BP7ES, BPR7E, BPR7ES

gaps 0.7 to 0.9mm for other than -11

-11 1.0 - 1.1mm

13 - 17 ft/lb tight torque

I am currently running BP7ES. colder 7 for the LPG, no R for the LPG and 0.8mm gap

discopotato03 · Post by **discopotato03** » Tue Aug 11, 2009 11:53 am

I didn't check my 87 WSM because I knew the ignition system on the 4 ECU plug systems is different .

Steptoe do they just give those three NGK plug types or do they specify the exact engine ie EA81 , EA82 carb/MPFI/MPFI-T ?

Seems strange to specify "R" and non resister plugs for the same engine types .

Cheers A .

Don't have any spare 3 plug turbo TPS's do you ?

discopotato03 · Post by **discopotato03** » Tue Aug 11, 2009 11:06 pm

I think I fathomed out which goes with what from my WSM . It shows MPFI turbo as BP6ES-II so non resister wide gap .

I noticed under "Others" and European non Catalyst model cooler 7 heat range plugs are used - BP7ES for the Other which is closer to my spec .

Cheers A .

Gannon · Post by **Gannon** » Wed Aug 12, 2009 6:28 am

Umm, 3 plug turbos dont have a throttle position sensor.

Its just 2 contacts, 1 for idle, and the other for half throttle

steptoe · Post by **steptoe** » Wed Aug 12, 2009 2:17 pm

Umm, Gannon, nobody said sensor, TPSwitch?

Found that the half throttle position varies between Oz and elsewhere tooo!

Those plugs were just for turbo EA82, gave other brands but I recall u too go ngk. I stuffed one TPS, have a 4 pin off my half spider TB. I have another but think it came off the unknown TB to fit up to the half spider, was not subaru but still three pin. I'll have a look.

discopotato03 · Post by **discopotato03** » Thu Aug 13, 2009 6:39 pm

Hi from Melbourne this time , guys I think my running probs are partly due to the wrong plugs and partly to do with my "distributors" vacuum can going pear shaped - leaking .

When the spider manifold went on my RX's original engine I mucked around lots with distributor actuator vacuum supply and I think its absolutely critical that it gets "ported vacuum" , as the factory WSM calls it , from the near side throttle bodies brass barb fitting . Also the that diaphragm cannot be leaking for the ignition timing to be right . Recently i was running the dizzy of the center brass barb and it felt pretty flat .
I gather that these engines needs LOTS of vac advance till the manifold pressure rises (WOT at lowish revs) and progressive pressure retard when the turbo starts to boost . I imagine if the diaphragm leaks you don't get as much initial advance and then not as much retard on boost .

I need the address of that firm I think in QLD that repairs these things , I have a spare 3 plug Vortex dizzy I can pinch the actuator off and send up to be fixed .

Whenst back in Sinn City , southern outskirts actually , I'll get a set of BP7ES NGK's and give them a go . My mechanic mate wants to resistance test the leads too and that should show if any of them are lemoning out .
Must get him to test the coil as well so we know the readings for the low tension side .

We have that second oxygen sensor bung welded into our dump pipe now so can set up the Tech edge wide band and take a look at her mixtures too .

In time . A .

Uh and yes I know the early system only has a twin set throttle position switch , one set that opens as the throttle just cracks and another that closes when the throttler is open past the very light or cruise position . No doubt it does things like sends the oxygen sensor portion out of closed loop and uses a richer mapping for on boost power requirements .
So the combinations the computer gets is :

Switch 1 closed - idle or overrun .
Both switches open - light throttle cruse - probably closed loop mode .
Switch 2 closed - high or full power enrichment fuel mapping .

The later system has the No 1 or idle switch and a potentiometer or variable voltage system to tell the ECU where the throttle is and how fast it's opening or closing .

brumbyrunner · Post by **brumbyrunner** » Thu Aug 13, 2009 8:13 pm

There's a mob in Melbourne called Dizzy's Galore that give exceptionally good service.

discopotato03 · Post by **discopotato03** » Thu Aug 13, 2009 10:00 pm

This thread spells it out , cheers A .

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