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Forced Induction Forum Sponsored by Active Autowerke
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Old 10-25-2011, 01:47 AM   #401
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1.) You need to find out the main bearing clearances MEASURED by the shop that put your engine together. They should have documented the clearances for all 7 main bearing caps.

2.) If you used Raceware main bearing studs, confirm with the shop that assembled your engine that they cut 2 of the studs down to clear the oil pump. If the oil pump were to hit these studs, even slightly, you'd have a leak between the pump and the block, as well as a drive chain miss-alignment. I've also heard of a case where the oil pump pickup was bent too close to the bottom of the oil pan, and it literally starved the oil pump. (low pressure at idle, and max of 45 PSI at 6k RPM)

FYI, I used OEM main bearings on my engine build, the main caps were align honed, and we arrived at 17 thou of clearance as an average. My engine will run 5W30 oil.
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Old 10-25-2011, 01:51 AM   #402
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btw this .82 a/r made me a lil sad I don't feel it good untill 3700rpm it was like 2200rpm before.
The difference between the 2 housings is very small. Talk to Nick...he's tested this. I can't post exactly what it is, because it's his info, but he does have this info...

He's also done some other very interesting testing that he may talk to you about. If you know about it, please keep it to yourself. Again, it's his info.
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Old 10-25-2011, 04:49 AM   #403
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Well maybe I don't remember very well but I know I can feel it.

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Old 10-25-2011, 07:01 AM   #404
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Well maybe I don't remember very well but I know I can feel it.

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This is the choice you have to make when changing turbine housings, turbine wheel sizes, compressor wheel sizes, and compressor housings. The bigger you go, you give up some lower RPM response for top end power.

In this case, the better breathing 0.82 exhaust housing doesn't breath any better than the 0.63 exhaust housing at 7 psi. Nick has tested this....he didn't see more power until above your current boost level.

In my case, I might see even more lag, as I've got a larger compressor wheel as well as the 0.82 A/R exhaust housing. But....I've also improved the VE of the engine significantly over OEM, so I might have balanced that off with higher exhaust flow at lower RPM to help spool the turbo up similar to the stock setup. We'll just have to wait and see....
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Old 10-25-2011, 12:02 PM   #405
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Old 10-25-2011, 03:02 PM   #406
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Originally Posted by PEI330Ci View Post
This is the choice you have to make when changing turbine housings, turbine wheel sizes, compressor wheel sizes, and compressor housings. The bigger you go, you give up some lower RPM response for top end power.

In this case, the better breathing 0.82 exhaust housing doesn't breath any better than the 0.63 exhaust housing at 7 psi. Nick has tested this....he didn't see more power until above your current boost level.

In my case, I might see even more lag, as I've got a larger compressor wheel as well as the 0.82 A/R exhaust housing. But....I've also improved the VE of the engine significantly over OEM, so I might have balanced that off with higher exhaust flow at lower RPM to help spool the turbo up similar to the stock setup. We'll just have to wait and see....
What is this .. Adam using FI ? Blasphemy ! (i know its for the grocery getter .. but in my mind adam = NA )
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Old 10-25-2011, 05:04 PM   #407
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What is this .. Adam using FI ? Blasphemy ! (i know its for the grocery getter .. but in my mind adam = NA )
I've been seduced:

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Old 10-25-2011, 05:56 PM   #408
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I've been seduced:

That a HTA 76? 82? 86? 94?
seems like u would put a HTA76 in there
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Old 10-25-2011, 06:25 PM   #409
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67?
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Old 10-26-2011, 03:23 AM   #410
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ok so i was told for the main bearings .0018 the machine shop also says I should try using 15w-40 .
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Old 10-26-2011, 05:56 AM   #411
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That a HTA 76? 82? 86? 94?
seems like u would put a HTA76 in there
Those wouldn't even start to spool by the time I hit redline. LOL

Well...maybe a little bit, but they are too big.

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67?
Smaller. I still might change turbos again, but it's not for something bigger, just different design.

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ok so i was told for the main bearings .0018 the machine shop also says I should try using 15w-40 .
You are golden on clearance, basically OEM specs. You can run that oil, but I still think that you might have an issue.

With OEM clearances, and OEM oil weight, you shouldn't have a low pressure light come on at idle.

Do you have an independant oil pressure gauge you could video while driving the car?
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Old 10-26-2011, 11:30 AM   #412
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Probably a dumv question but the picture kinda looks like it...
Did you remove your bumper completely to fit that intercooler and then just put the plastic back on?. Or did you get through the bumper and leave some parts of metal still there?.
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Old 10-26-2011, 04:32 PM   #413
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Those wouldn't even start to spool by the time I hit redline. LOL

Well...maybe a little bit, but they are too big.



Smaller. I still might change turbos again, but it's not for something bigger, just different design.



You are golden on clearance, basically OEM specs. You can run that oil, but I still think that you might have an issue.

With OEM clearances, and OEM oil weight, you shouldn't have a low pressure light come on at idle.

Do you have an independant oil pressure gauge you could video while driving the car?
No just the red light.

Just this short video.

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Old 10-26-2011, 05:44 PM   #414
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How big is the oil inlet hose on the kit ?
Since the pressure sensor is probably where you draw oil from the turbo that's my second guess.

But really , we shouldnt be guessing if you're scoring your crank or not , get a gauge hooked up ASAP
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Old 10-26-2011, 05:52 PM   #415
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I think you need more info...like the actual oil pressure versus engine RPM.

You can get this with a good scanner like the AutoEnginuity scan tool with advanced BMW functionality. Here's an example of what it can do:








Basically, you can get oil temp and pressure without adding more sensors or gauges...as well as watch a lot of what is going on in the rest of the engine.

If I were you, I'd get the data I suggested above with the engine oil you have now, and then try changing to the oil that your machine shop recommends and compare.
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Old 10-26-2011, 09:10 PM   #416
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I have a tool I'm going to go out side with my laptop right now and see if i can do this.
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Old 10-26-2011, 09:34 PM   #417
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Good stuff and you got the right guy leading you in the right direction.
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Old 10-26-2011, 10:14 PM   #418
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Yeah this is the most I can get.


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Old 10-27-2011, 03:40 AM   #419
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Those wouldn't even start to spool by the time I hit redline. LOL

Well...maybe a little bit, but they are too big.
I think you may have mistaken what I refer to.. lol.. it is not the diameter of compressor in mm.. HTA is the line of turbo developed by Forced-Performance in Texas.. HTA76 is a GT30R, HTA82, 86 are GT35R, HTA94 is GT37R.. Hope you are not running anything smaller than the GT3076HTA.. Oh well, if you are interested, you should look more into that turbo.. I can say that the EVO community has somewhat proven the HTA turbos outspools the Precision counterparts that makes the same hp.. We should keep this thread back to track.. Let me know if you want more info on those turbos.. Or I'm sure you have got more than enough research skills
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Old 10-29-2011, 07:25 PM   #420
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If everything goes well dyno next week.



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