Need advice on tbi turbo build

[PlayingWithTBI]

So that’s what I was thinking when I could use the safc 2 to tune it. I think it’s more modern that the flash II and I can set everything from a screen. And a the flash II is mad expensive, at least for me. The safc 2 is around 350$ instead of 500 for programming for 4 injectors. I pretty sure you can set how many injectors on the safc 2.

I'm not familiar with the safc 2, after a quick search it looks like it regulates fuel. what about timing? The EBL has provisions for that along with BPC. There's other tables which other OE ECMs don't. Here's an example.

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IDK, the idea of having 8 on-board flash calibrations to play with, sure beats swapping a chip at a time. You can run on one .bin then switch to another "bank" real time without shutting off the engine.

 

[Ronald W]

I'm not familiar with the safc 2, after a quick search it looks like it regulates fuel. what about timing? The EBL has provisions for that along with BPC. There's other tables which other OE ECMs don't. Here's an example.

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IDK, the idea of having 8 on-board flash calibrations to play with, sure beats swapping a chip at a time. You can run on one .bin then switch to another "bank" real time without shutting off the engine.

Well your right the apexi Safc 2 does only fuel/air. So I bought the apexi rvc-r witch is specifically for boost. Also i figure the knock sensor could retard timing under boost to prevent knock. The max amount ive read itll retard it is 8 degrees, and under the assumption that one degree of retard per pound of boost, so for 6 pounds id be ok.

 

[Ronald W]

Ill post some pictures tomorrow. I still have to modify some stuff and get some more bolts to mock stuff. For example my crossover pipe is right up against my transmission so i need to cut it and weld it up again and header wrap it.

 

[PlayingWithTBI]

Also i figure the knock sensor could retard timing under boost to prevent knock. The max amount ive read itll retard it is 8 degrees, and under the assumption that one degree of retard per pound of boost, so for 6 pounds id be ok.

Yeah, I just don't like the idea of using the KS as your only control of spark retard. That means it won't react UNTIL it sees knock. That means your engine is going to be knocking every time you hit the go pedal...ouch!

What if it goes bad? You won't have a backup to save your internals from going bye bye.

 

[Ronald W]

Yeah, I just don't like the idea of using the KS as your only control of spark retard. That means it won't react UNTIL it sees knock. That means your engine is going to be knocking every time you hit the go pedal...ouch!

What if it goes bad? You won't have a backup to save your internals from going bye bye.

yeah I figured. That apexi rvc-r can retard timing since it specifically for boost applications. Maybe i can also tune the stock chip to retard timing under positive pressure, since i did just buy the gm obd1 tuning kit.

 

[Schurkey]

That oil would have to get pretty high to flood the valves. Also there the restrictor plate in the oil feed so it shouldnt push that much oil in the valve cover.

Isn't the oil coming off of the turbo foamed-up from having spun a hundred-thousand rpm? I figure there is a chance the oil level in the valve cover goes high enough to wet the valve stems.

But I've been wrong before, and I don't know turbos.

On a stock head there are slits or small holes that align the push rods that have small clearances to align the pushrod... ...And when i put the rockers on they were all centered on the valve.

Yeah, that's what other people have figured.

If you have OVAL pushrod holes (not real common on TBI engines) (which are a snug fit on the pushrods to keep the rockers centered, but loose the other way to allow the pushrod to tilt in-line with the rocker as the lift increases and decreases) you could be OK. If you have ROUND holes, like most TBI heads, you're gonna have problems unless you have self-aligning rockers.

Comparison between round and oval pushrod holes.

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[Ronald W]

Isn't the oil coming off of the turbo foamed-up from having spun a hundred-thousand rpm? I figure there is a chance the oil level in the valve cover goes high enough to wet the valve stems.

But I've been wrong before, and I don't know turbos.


Yeah, that's what other people have figured.

If you have OVAL pushrod holes (not real common on TBI engines) (which are a snug fit on the pushrods to keep the rockers centered, but loose the other way to allow the pushrod to tilt in-line with the rocker as the lift increases and decreases) you could be OK. If you have ROUND holes, like most TBI heads, you're gonna have problems unless you have self-aligning rockers.

Comparison between round and oval pushrod holes.

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Isn't the oil coming off of the turbo foamed-up from having spun a hundred-thousand rpm? I figure there is a chance the oil level in the valve cover goes high enough to wet the valve stems.

But I've been wrong before, and I don't know turbos.


Yeah, that's what other people have figured.

If you have OVAL pushrod holes (not real common on TBI engines) (which are a snug fit on the pushrods to keep the rockers centered, but loose the other way to allow the pushrod to tilt in-line with the rocker as the lift increases and decreases) you could be OK. If you have ROUND holes, like most TBI heads, you're gonna have problems unless you have self-aligning rockers.

Comparison between round and oval pushrod holes.

You must be registered for see images attach

There comp cams comp cams 1418-16 self aligning roller rockers. I do have the circle hole. However the comp cams comp cams 1418-16 roller rocker dont look self aligning. Theres no ridge or washers on the roller to align it so im guess it alines them some other way

 

[Ronald W]

Tbh i dont even remember what they look like. Ill pull a valve Cover tomorrow to verify

 

[Schurkey]

There comp cams comp cams 1418-16 self aligning roller rockers. I do have the circle hole. However the comp cams comp cams 1418-16 roller rocker dont look self aligning. Theres no ridge or washers on the roller to align it so im guess it alines them some other way

COMP Cams 1418-1 COMP Cams Magnum Roller Tip Rocker Arms | Summit Racing

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Definitely self-aligning. If yours don't look like that, you have the wrong ones.

 

[1990Z71Swede]

Not to derail this thread, just jumping in to encourage this thought train of ideas! Did that hx35 see daylight yet? Lol! Do a build thread for us, I know I love seeing how people fab stuff up, no matter how hacked together it may seem, I learn from it all!

Well the intended Full size Typhoon/Yukon truck is not in my posession
yet, (and may never be, it looks like). So it does not look like this will happen anytime soon.