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[ifly87]

DING DING DING, we have a winner.

if you have a stg1 turbine with a 57 trim compressor with a LARGE .70 a/r houisng that asking for surge. the large housing allows the turbo to spool up faster then normal and the stg1 turbine is tiny and not matched to the compressor wheel.

if i would guess the turbo just spools up to fast and stalls the comp wheel.  :yes:

I really hope this is the problem. I wonder if I should take the shaft and turbine housing out of the china turbo and put it in my garrett chra with my garrett compressor wheel and housing? Maybe I should have just paid the extra $300 for the stg. 3 turbine wheel when I sent it to blaast like he was trying to convince me to. He was just saying it would help spool times. Ok, well I guess we'll see soon.

[HiProfile]

A stage1 is not only small, but restrictive. The fins are bent over twice as far on the turbine exducer vs a stg2 or stg3. I forgot the word "surge" in my previous post - SRT-4's surge with a 57trim+.48ar, but I'd imagine a stg1+.63ar would have a similar outcome. So...it probably is some major surging. Since boost ramps up much faster the higher it goes, that's the reason low boost is okay. It's also why a "better" boost controller (that spools it faster) is more problematic.

I'm guessing your .70ar housing is the one that looks like a holset/borgwarner/gt35r 4" inlet housing. If so: Mark where the lower inducer blades start (the blades below the 6 visible). Go to a machine shop. Have them machine out a slit all the way around like a "Map Width Enhancement Groove". Make sure they leave 3 spots uncut to support the metal above the groove. Profit.





**Whatever you do, don't pull apart a real garrett to use Ebay junk. You'll loose far more by making that Garrett worthless than you would buying a $150 ebay turbo. Garrett+ebay parts = $$ scrap metal.

[ifly87]

Alright, thanks for the posts. I have the ebay turbo on it, It honestly looks much better than the garrett. The casting looks really nice, all the hardware on the thing looks to be real nice, and its all the right length and none of the holes are fucked up. Much Much better than the last ebay turbo I tried probably 4 or 5 years ago.

Anyway I really dont know how this turbo will compare, It only has a .50 A/R compressor housing and the compressor wheel's inducer appears to be smaller, although it is the same .63a/r turbine housing the wheel is the much bigger stg3 on the ebay turbo compared to my stg 1 garrett.

[ifly87]

Still waiting for my silicone coupler in the mail but I stuck one of those homedepot pvc couplers on it just to see if it worked and it held 15psi solid, turned the boost controller up a bit and held 17psi solid through 2nd and then the coupler blew apart. It was feeling real good though absolutely no flutter I cant wait until I get a real coupler in the mail.

[turbob16hatch]

what was the spool times with the old turbo and with the new one? i would like to see where the old one was surging also.

[ifly87]

I'm at 15psi or full boost by about 4,500rpm, the old garrett wasnt at full boost until almolst 5,500. The old one was surging above 14-15psi at pretty much any rpm it could make that amount of pressure.

[ifly87]

Ok, Finally got the coupler in the mail yesterday, jesus it sucks living in NE wisconsin, there is nothing local that sells parts and shipping takes forever. Anyway, the ebay turbo spools about 1,000rpm faster so I get full boost by about 4,500rpm. Holds 20psi perfectly steady absolutely no more surging I am so happy, holy fuck it pulls like a monster at 20psi. One of my friends who is an electrical engineer designed a meth injection kit that varies the meth injected depending on engine load and intake temperature, so after I tuned it up at 20psi, we started playing with that. At 20psi I was getting charge temps of about 90 degree's throughout pulls (60 deg. outside), with the water injection's first coupple pulls we were getting the charge temps to stay consistantly down at 60 deg. which was real cool. After a pull I jumped out and grabbed the IM and it was cool to the touch, which was awesome since even just sitting there idling the IM gets heatsoaked and feels hot, even with the thermal IM and TB gaskets.

[turbob16hatch]

Good to know the turbo fixed it.  :yes:

[ifly87]

Yeah big relief, I was getting real pissed.

[92CXyD]

Any chance of posting some schematics on the water Meth controller? ;D

[ifly87]

Well I would but the schematics would do you no good because its controlled by a microcontroller, and without the program it would be useless. And the programing for now is a closely guarded secret

[900s]

Good to hear it's fixed and that water injection setup sounds pretty fucking tits.

Whereabouts in NE WI?

[ifly87]

Appleton area, what about you?

[Jorsher]

Next time I'm in WI may have to stop out...we're usually in the Fond du Lac/Oakfield area, but IIRC Appleton was only 1-2 hours away.

Why closely guard the program

[900s]

Appleton area, what about you?

Actually I grew up in Milwaukee, just moved up north of the twin cities for school last fall.

Buddy of mine just moved to Waupaca so I'll probably be out in the area every now and then between trips back to the shithole on the lake.

[crxvtec91]

Next time I'm in WI may have to stop out...we're usually in the Fond du Lac/Oakfield area, but IIRC Appleton was only 1-2 hours away.

Why closely guard the program

Because the guy most likely plans to sell it. Plus he spent the time to creat it.

[ifly87]

Next time I'm in WI may have to stop out...we're usually in the Fond du Lac/Oakfield area, but IIRC Appleton was only 1-2 hours away.

Why closely guard the program

Because the guy most likely plans to sell it. Plus he spent the time to creat it.

Plans to sell it are still up in the air, and its still being tested.

Appleton is probably less than an hour from fondulac