Rajicase's First Turbo Build, Ballin' On A (Nonexistent) Budget

[rajicase]

What did you run for insulation.

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What insulation?

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Did you try running regulated pressure to the top of the wastegate at all with the softer spring? That should help spool some, and may give you the control you would like. But maybe you tried it already..

Manual boost controller.

[rajicase]

So having an issue in 2nd and 3rd gear with car breaking up bad in boost, just looses all power and falls on its face when boost comes on.
4th gear pulls perfectly fine, 27-28psi to red line.
I'm going to gap my plugs later, but doubt that's my issue since it doesn't happen in 4th gear.....

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**This issue only started occurring when I turned the boost up

[Kevin325i]

What's fuel pressure and tank level look like?

[Smurf36]

What insulation?

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Manual boost controller.

Trans tunnel and bay


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[tptrsn]

Manual boost controller.

So you're saying you used a low pressure high resolution air pressure regulator to manually add air pressure to the top of the dome above the diaphragm, or you're referring to a Hallman style MBC to the side port?

[rajicase]

What's fuel pressure and tank level look like?

Tank is full.
I don't know what the fuel pressure looks like, but it should be okay. 61psi base+27-28psi boost pressure keeps me well under the 125ps relief. Plus AFRs are perfect in 4th gear pulls.

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Trans tunnel and bay


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DEI heat shield in the trans tunnel.

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So you're saying you used a low pressure high resolution air pressure regulator to manually add air pressure to the top of the dome above the diaphragm, or you're referring to a Hallman style MBC to the side port?

No, top port on the WG is just open. Havent ever messed with the top port, didn't think I could with my MBC.

[tptrsn]

No, top port on the WG is just open. Havent ever messed with the top port, didn't think I could with my MBC.

There is more responsiveness you can gain then. The normal MBC to the side port functions by delaying the boost pressure going into the chamber under the diaphragm, and thereby delays the point at which the wastegate opens.

The problem/limitation to that is that depending on your boost to drive pressure ratio SG28k mentioned earlier, the pressure in the manifold will eventually push the wastegate valve open, pushing drive pressure out the wastegate. In this way boost is self-limited. It's why you technically don't even need a pressure reference going to a wastegate at all for it to function, but it's super-not-ideal. This also means that the valve will start to bleed off drive pressure before you want it to, which slows spoolup.

If you add boost pressure to the top chamber of the wastegate above the diaphragm, you actually use that pressure to help hold the wastegate valve shut, which will help responsiveness in areas where the drive pressure would have been cracking the valve off its seat. You can do this with an electronic boost controller, or with a simple pressure regulator that is a low pressure/high resolution variety.

[Kevin325i]

Tank is full.
I don't know what the fuel pressure looks like, but it should be okay. 61psi base+27-28psi boost pressure keeps me well under the 125ps relief. Plus AFRs are perfect in 4th gear pulls.

With a full tank you shouldn't be starving it. 4th gear pull is odd, makes me jump to thinking it's something heat related and the higher vehicle speed is getting more air across the coils. Does it sound like the drive belt is slipping? You could be dropping voltage from slip at faster engine acceleration rates but that's a long shot.


How repeatable is it?

Every time you roll into it? Only with a fast pedal movement? From any engine speed tip in?

[someguy2800]

So having an issue in 2nd and 3rd gear with car breaking up bad in boost, just looses all power and falls on its face when boost comes on.
4th gear pulls perfectly fine, 27-28psi to red line.
I'm going to gap my plugs later, but doubt that's my issue since it doesn't happen in 4th gear.....

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**This issue only started occurring when I turned the boost up

I don't have an explanation why it only happens 2-3, but I'd bet money a new set if ngk's at .018" gap has her running sweet.

[PEI330Ci]

I don't have an explanation why it only happens 2-3, but I'd bet money a new set if ngk's at .018" gap has her running sweet.

Rate of change.

Specifically, how much time between each spark event for the coils to charge.

I mention this as a factor, not necessarily the route cause.

I've heard that upgrading the common supply (12V+ and GND) wiring to the coils has helped improve things in some cases. For example, running 8awg wire to the splice point.

[rajicase]

Figured problem out. Replaced plugs with new NGKs gapped to .018, no improvement.
Car is leaning out. Watched AFRs going into a pull and right before it cuts out it hits high 12s low 13s and then immediately falls on its face.

I have a couple options, currently thinking of picking up a BAP and trying to crank the base pressure up a bit more. Buddy has a BNIB kenne belle BAP FS cheap... HRM

[Mklock]

Why not juat get more injector? Are you still on 80s?

[Smurf36]

Why not juat get more injector? Are you still on 80s?

That's what id do as well

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[rajicase]

Why not juat get more injector? Are you still on 80s?

Yes, not really an option right now.

[Mklock]

Okay, was just curious. You might have to be content on 24psi and call it a day till you can upgrade. Do you have meth yet?

[rajicase]

Ive got a direct port meth set up I may install to supplement fuel. Havent decided yet.

[vollosso]

Bosch 1000cc are like 400$. But if youre breaking up before 6k its not fuel. We can add tons of fuel down low. Fuel is only an issue up top.


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[vollosso]

Also as i posted before:



He is out of air.


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[rajicase]

Bosch 1000cc are like 400$. But if youre breaking up before 6k its not fuel. We can add tons of fuel down low. Fuel is only an issue up top.


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What makes you say its not fuel?
It leans out right before it cuts out. This issue is only occurring with the new boost setting.

[Mklock]

Time for the 69sxe lol.

[Smurf36]

Time for the 69sxe lol.

Lol always chasing more. Raji, what manifold are you using again? I was just going to rock a ebay cast manifold cause it's cheap and I can spend more money elsewhere but I'm contemplating getting a spa.

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[jakermac]

Is this the Walbro that you and Zack were chatting about before? Is it a direct drop in for the E36 with the right sock kit? I might be setting mine up for E85 and I'm looking at a new pump.

http://walbrofuelpumps.com/walbro-f9...-fuel-pump-e85

[vollosso]

What makes you say its not fuel?
It leans out right before it cuts out. This issue is only occurring with the new boost setting.

It cuts lean? Misfires are lean. Blowouts are lean.

What rpm does it go "lean"


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[rajicase]

It cuts lean? Misfires are lean. Blowouts are lean.

What rpm does it go "lean"


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As soon as boost hits, doesn't seem to matter what rpm, it seems to correlate with whenever it hits 27-28psi.

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I gapped new plugs down to 0.018 and its still cutting out. It also doesn't do it at lower boost.

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Is this the Walbro that you and Zack were chatting about before? Is it a direct drop in for the E36 with the right sock kit? I might be setting mine up for E85 and I'm looking at a new pump.

http://walbrofuelpumps.com/walbro-f9...-fuel-pump-e85

Yeah that's the one I'm using.

[Mklock]

Index plugs?? *Idk if that will even do anything*