m52 Turbo Build

[328iFun]

Your turning into a toned down mild bry195.

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I think he was right about the ICV awhile back though:

I unplugged that mfer and no more f'd up idle. amazing

-------------------------------------------------------------------------------------------------------------------- Bry195:

As easy as it is to start the car and unplug the electrical connector on the IACV i would have thought you woul have done it even if its to tell me im crazy. But here goes I'll explain

even with a good iacv the idle can hunt. The OEM or even tuned IACV is has a mathematical model that tells it how much to open and close over a given amount of time based on the physics of the motor the model was tuned or developed for. Part of this model is to uses rpm feedback and other parameters to land the comanded value smoothly on the actual value with an expectancy window that we tell it to try again if it (mid move) is not where its suposed to be.

so imagine that one of the variables that provides feedback to the math model is a little off. It cold undershoot the target or overshoot the target. So the expectancy window throws it in the opposite direction. 1 of 3 things happen. On reveral it overshoots another window and throws yet another reveral at it. So it either drifts into the right window, drifts by the window, or hits the target.

so you get a decaying oscilation an increasing oscilation a steady oscilation or you hit it on the head.

if you unplug you get nothing but it eliminates the timing, fuel, and iacv compensations. If the car dies when you unplug you get to open the throttle plate idle adjust and tke a bunch of crap for touching the untouchable.

you adjust it to where the car jst stays running and decide you dont need the iacv. Or you decide im going to open it up further while the car is running and all holy hell braks loose with mixtures and rpm and then you unlug and call it good enough. Or you push through the storm and keep opening the idle adjustment and remember some smat a** was whining you forced him to write a book for an experiment that is just as likely not the same as his problem was s it is that al the same indicators led him to solve his problem this way. Touch the untouchable but only half of the tuning tables are going to work when you have the CEL. My rpm oscillation had 1 second the .5 second then .25 second intervals and then dead silence when the CEL was not on and the PID loops for fuel, IACV, and ignition stayed in 1 table and fell into the expectancy window.

the iacv retards and advances idle speed. Its a very fast continuously varable bi directional valve that is corrected by several other tables that lag the valve......thus the need for the math model to begin with.

Friction, inertia, temperature, afr, .......the model compensates for a limited amount of variation.

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Probably not. That's why you MAKE IT LIKE IT.
Beat it into submission.
NO MERCY.

Well,

If I'm going to make 20-22 PSI on stock b28 then you should atleast be making 30-33 on your built motor. Just sayin'

[rajicase]

I think he was right about the ICV awhile back though.

I unplugged that mfer and no more f'd up idle. amazing

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Well,

If I'm going to make 20-22 PSI on stock b28 then you should atleast be making 30-33 on your built motor. Just sayin'

I'm working on it XD
I bent the F out of my rods around 20ish psi from my S366sxe on E85.

[328iFun]

I'm working on it XD
I bent the F out of my rods around 20ish psi from my S366sxe on E85.

Yes I remember,

I'm m52, less displacement, smaller turbo so I might beable to do 20

[rajicase]

Only one way to find out.

[328iFun]

Only one way to find out.

You my friend,

are a very, very bad person

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Well have to see how Zackary feels about it

[Butters Stoch]

I ran a 300k m52 to 24# on 93 no meth with a 35r and trapped just about 130mph on a Technica tune.

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[328iFun]

I ran a 300k m52 to 24# on 93 no meth with a 35r and trapped just about 130mph on a Technica tune.

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That's impressive

I plan on doing some major wiring this weekend. That computer I was talking about I plan on getting it all setup and the Meth Kit as well.

Also want tap the OEM harness to the ZT-2 so I can log properly. I know you've you done it and I've read you can tap the diag port under the hood for some of it

[vollosso]

Yeah your tune has fuel for it.

If you have enough octane is the real question.

Your biggest problem is that little hotside.


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[JPE36M3]

I'm working on it XD
I bent the F out of my rods around 20ish psi from my S366sxe on E85.

raj, whats the best I can do SAFELY (for now) s366, on a stock s52 with meth on PUMP 92? hell, without the meth even.. what, 14 psi?

[rajicase]

I can't say for sure, but on 92 I wouldn't wanna go much past 14-15psi. With meth you can probably get by with a bit more, but those stock rods won't like a lot more i don't think.

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[rajicase]

That's assuming 9.0:1 compression.

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[JPE36M3]

I can't say for sure, but on 92 I wouldn't wanna go much past 14-15psi. With meth you can probably get by with a bit more, but those stock rods won't like a lot more i don't think.

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sounds good, I don't wanna chance the car for summer time, just wanna enjoy it, 14 PSI max then and with meth, ill push it when the block is done. 14 should be enough to break some hearts on the freeway. I have full intentions to build that block, if my season goes well and let her rip 20+ with a better clutch too....

yes 9:0:1

[328iFun]

sounds good, I don't wanna chance the car for summer time, just wanna enjoy it, 14 PSI max then and with meth, ill push it when the block is done. 14 should be enough to break some hearts on the freeway. I have full intentions to build that block, if my season goes well and let her rip 20+ with a better clutch too....

yes 9:0:1

If I'm enjoying 7-10 PSI on a b28 with a 6262, .58 AR - I'd say your going to love it as well - especially with your additional displacement.

Most I've done is like 12.6# and the car flys. Granted, its not a drag monster like a few of the guys on here but makes a fast reliable street car.

Turning it up is just being trivial in my opinion - If I didn't have the EBC I would happy with 7-10# quite awhile.

Get your car done, start with 7 if everything checks out turn it up to 10. I think 10# would be solid for you

just my .02

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Yeah your tune has fuel for it.

If you have enough octane is the real question.

Your biggest problem is that little hotside.


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What back housing do you recommend?

[328iFun]

Meth Heads, do you guys think this will spray correctly. Its for the snow nozzle so I had to thread the AEM nozzle in the opposite direction. Also the nut will have to go into the boot which is concerning in the event it were to fall off. Thoughts?




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[Butters Stoch]

Put it on the silicone then cut the excess away.

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[328iFun]

Put it on the silicone then cut the excess away.

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Really not much to cut away

Think it'll do?






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I could trim it down flat.

Put loctite and epoxy on the threads

[Butters Stoch]

I ran that exact fitting a while ago. It will be fine.

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[328iFun]

Cool deal

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[328iFun]

Received LCD head unit and a few parts for my incar mini itx pc build, so I can run digital dashboards and diganostics via scantool XL professional:

Here are few dashes (if only you could read oil pres / temp from the OBD II port)

[Butters Stoch]

The obd2 port kinda sucks tho for sample/refresh rate. Definitely not close to real time unfortunately.

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[328iFun]

The obd2 port kinda sucks tho for sample/refresh rate. Definitely not close to real time unfortunately.

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Yeah, unfortunately.

I think there's like 2-2.5 (sometimes 3) second lag. Gauges are just a plus will be cool to have on when a friend or family member is in the car.

Rigging it up more so for:
- Diagnostics
- ZT-2 Data Logging
- Tuner access at anytime
- Media

Possibilities are endless with a Computer... So much third party software out there

It'll be cool.

Could be good for "ethical" hacking too... Could throw kali linux on there (if anyone knows what that is) and have a lil fun

[328iFun]

I wonder there's a way to speed up the sampling rate...

[vollosso]

I wonder there's a way to speed up the sampling rate...

To a certain extent yes you can improve the rate you are receiving samples. The rate the data is sent is based on whats being requested.


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[SCapelo]

How do you plan to mount the head unit? In the radio slot? Or sunglass holder? I've debated this forever

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[NOTORIOUS VR]

I wonder there's a way to speed up the sampling rate...

The sampling rate issue is due to the protocol used... nothing you can do (except request less data at once of course).