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 Post subject: Re: Tobyo's 09 XT - Short block done / PG91
PostPosted: Wed Feb 06, 2019 9:32 am 
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Vehicle: MY08 XT (SH)

Posts: 1477
Location: Brisbane
short intercooler pipes are a good thing for throttle response etc aren't they? (according to accepted wisdom).

---

You could have put up a youtube video of yesterday's efforts with the lathe called "modifying my alloy small block - you won't believe what happens!" as clickbait for confused Americans.

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 Post subject: Re: Tobyo's 09 XT - Short block done / PG91
PostPosted: Thu Feb 07, 2019 10:04 pm 
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I Say: Ozfoz Courier Service - Newcastle Office
Vehicle: MY09 XT Premium

Posts: 1686
Location: Newcastle
Hope that blue tape will hold out though. It’s good stuff but..


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 Post subject: Re: Tobyo's 09 XT - Short block done / PG91
PostPosted: Sat Feb 09, 2019 10:17 am 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1934
Location: Mealbun Orstraya
ozmaen wrote:
Hope that blue tape will hold out though. It’s good stuff but..


My house is held together with painters tape, the termites don’t like the flavor.
If it can hold a few tonne upright, then it’s good for a few PSI.

My Bling wheels arrived.
Exhaust side only as we have AVCS on the intake side.

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 Post subject: Re: Tobyo's 09 XT - Short block done / PG91
PostPosted: Sat Feb 09, 2019 10:46 am 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1934
Location: Mealbun Orstraya
Made a Version 2.1 IAT housing. This one now acts as a reducer between the throttle body and intercooler pipes (70mm to 63.5mm).

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 11:35 am 
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Vehicle: MY08 XT (SH)

Posts: 1477
Location: Brisbane
Will you get some use out of the exhaust cam phase adjustment?

Pity the shiny anodised parts have to hide behind a black plastic cover.

If only a person had the capacity to dremel out some slots in the cam belt cover and replace them with laser-cut mesh....

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 12:04 pm 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1934
Location: Mealbun Orstraya
Believe it or not, someone does actually sell clear EJ timing belt covers :lol:
The people who are assembling my engine said to get the adjustable cam gears, so I got them. They know what they are doing, where as I don’t.

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 1:43 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17925
Location: Spearwood Perth WA
Before even 'adjusting' the cam gears for tuning purposes, they need to be actually dialed in. This is something that is impossible with OEM gears.

The reason is that the cam centerlines will always be out to some degree, even when using OEM fixed gears on OEM cams. This is because the only way the gears locate and key into the cam is via a small pin / keyway on the cam face. This pin always has a little bit of play in it. And it is also very close radius to the center axis of rotation. Which will multiply any innacuracies with the pin itself, the closer it gets to the center of rotation. If the pin was on a larger radius from center, then the innaccuracies would decrease. But the front of the cqm is only like 50mm in diameter. So the pin must be very close to the centerline.

On top of that, as the heads and block are decked, different headgaskets are used etc, the spacing between the cams and crank will change. The cams will usually come a small amount closer to the crank. This means a belt with a fixed length, and fixed tooth spacing, will force a roational change (innaccuracy) if the distance between the cams and crank is shortened. This is then multiplued because you have 2 seperate heads. And 4 seperate cams. So one head is only going to see one lotof innaccuracy, but the opposite head will see TRIPPLE the innaccuracy. As the belt must go from crank, to one head, back frok the that head, and then across to the next head. So if the cam-crank spackng changes. It will be seen and stacked 3 times for the furhterest head in the belt routing.

So before even fiddling with the cam phasing for performance, they should be properly indicated in with a dial indicator and degree wheel, so that the lobes can be correlated to the crank posistion. This will almost certainly be out to some extent.

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 2:17 pm 
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I Say: There's no 'i' in Team, but there is in Winner!
Vehicle: MY10 XT

Posts: 1934
Location: Mealbun Orstraya
Thanks Bram.
Makes much more sense than if I tried to repeat what they explained

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 2:39 pm 
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Vehicle: MY11 S-Edition - SWP

Posts: 1174
Location: Sydney
Just saw this in the Deshele Facebook page. Seems they poke a thingamajig into the whatsamacallit to dial it in :)

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 Post subject: Re: Tobyo's 09 XT - New IAT housing / PG92
PostPosted: Sat Feb 09, 2019 3:15 pm 
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I Say: Car mods are like OddBodz, you got to collect them all! -------------------------------------
Vehicle: MY05 STi swapped sled

Posts: 17925
Location: Spearwood Perth WA
That pic is before even dialing in the gears. There isnt even a degree wheel fitted yet.

The dial guage is going down the spark plug hole. This means it is to measure TDC of that cylinder. You measure the degress as its coming up to TDC, then also as its heading away from TDC, and correlate that to the measurement on the dial indicator. Then you can then split the difference, and that will be exactly TDC. So now you can set the degree wheel to the crankshaft, and know the degree wheel is reading true crankshaft rotation.

From there, you can move the dial indicator to the lifter of the cam you are trying to dial. This measures the valve lift. You can then check the cam duration and open/close angles as found on the cam spec sheet. And then you will be able to see if the opening / closing times of valves match what you measure.

Then adjust the vernier scale on the cam shaft sprockets to match.

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