Turbine housing sizing + quickspool valve

[Nick-G]

done and done. Talked with Marc at TCE and we were both thinking of dropping the "quick-spool" project entirely... Oh yeah. Im actually going to use one of the Comp Turbo "GT35r" knock-off with a T3 1.15 A.R. Its got a billet wheel ($200 option), a triple BB shaft and a water/oil cooled "cast aluminum" center section (My first time ever seeing one). The one demo-unit that they had at the turbochargers.com wherehouse spins so effortlessly that you can blow in it and damn near make the impellor move. Its a bad-assed turbo. Definitely one of my better purchases this year. I ordered mine custom, so Ill post pics of it when it arrives.

pics or it didn't happen... jk

This should be interesting.

[ForcedFirebird]

See, John? Stop overthinking things I have had turbos in my hand efficient enough that they would turn over with a slight blast of air from the blow off tool on the low setting. One just about took the tip of my finger off when I wasn't paying attention and just being plain fascinated haha, 'twas a mere flesh wound...

[Driver_10]

See, John? Stop overthinking things I have had turbos in my hand efficient enough that they would turn over with a slight blast of air from the blow off tool on the low setting. One just about took the tip of my finger off when I wasn't paying attention and just being plain fascinated haha, 'twas a mere flesh wound...

I have the worlds worst habit of over analyzing things. I cant stand taking guesses. Id rather have the benifit of a mathmatical equation. In most ways its my strongest trait, in others my worst flaw.

In any case, It should be fun at the end.

Oh! BTW. If you have any spare 3400/ 3.4l connecting rods, could you please mail one to Marc at TCE. Hes in the midst of machining my SBC con-rods and need one to use as a template for locating the proper spot for the bearing tangs. Call me when you get the time. I know that youre extreemly busy, so its no rush.

[CNCguy]

John,
Ben sent me a rod and I picked up a set of bearings to verify tang location.

[ForcedFirebird]

I have the worlds worst habit of over analyzing things. I cant stand taking guesses. Id rather have the benifit of a mathmatical equation. In most ways its my strongest trait, in others my worst flaw.

In any case, It should be fun at the end.

Oh! BTW. If you have any spare 3400/ 3.4l connecting rods, could you please mail one to Marc at TCE. Hes in the midst of machining my SBC con-rods and need one to use as a template for locating the proper spot for the bearing tangs. Call me when you get the time. I know that youre extreemly busy, so its no rush.

John,
Ben sent me a rod and I picked up a set of bearings to verify tang location.

Good deal. John, can you believe this is finally coming to a close? I know you should have a very fast/reliable setup this time (as long as another Ike flood doesn;t hit TX )

[Driver_10]

Good deal. John, can you believe this is finally coming to a close? I know you should have a very fast/reliable setup this time (as long as another Ike flood doesn;t hit TX )

Ack! Dont jinx me! We still got one more month before hurricane season is over for us. Oh yeah! Be sure and take pics of the PS bracket when it comes back from the water jet. (For my scrap-book, ya'know)

[RedZMonte]

John,
Ben sent me a rod and I picked up a set of bearings to verify tang location.

Hmmm.... Dunno why that just sounds wrong..... LMAO!

[Driver_10]

Hmmm.... Dunno why that just sounds wrong..... LMAO!

[Driver_10]

Now mind you, this isnt MY turbo (Still being custom made) This is the demo unit that they had at turbochargers.com. You can see the aluminum center-section cartridge. Its rediculously light-weight.




Im having my turbo built to the following specs.

Polished, to4-s style "drill-ported" antisurge housing w 4 inch inlet and 2 outlet.
Triple ball-bearing, water/oil-cooled, cast aluminum centersection
CNC billet 62mm wheel
divided t3, 1.15 a.r. turbine w/ 3inch v-band outlet

[MidnightriderZ24]

damn that thing might be laggy for city/cruising fun. that looks like a sick turbo

[Driver_10]

damn that thing might be laggy for city/cruising fun. that looks like a sick turbo

This is just thier demo unit. My turbo hasnt arrived yet. Im using a billet 62mm wheel compressor combo w/ t3 divided housing and a pulse divided turbo-system. If John could get away with using a Holset HX35 on bimmer 2.5l and spool-up by 2500rpms, then Im sure that I could use a 1.15 a.r. t3. and have full boost by at least 3000 rpms.

[Driver_10]

Well, the new turbo just arrived. CNC cut "anti-surge" housing, billet CNC 62mm wheel, cast aluminum oil/water cooled center cartrige (Its gonna be fun) Ill be experimenting with dual wastegates (one from each runner of the divided turbine). The philosophy is to prevent the pulses from interfering with one-another and maintain high turbine efficiency. Well see how it works.









Heres a pic side by side with my old T3 S256 (which was a great turbo BTW, just not up to snuff for the new motor) Note the difference in exhaust housing sizes (S256 .69 A.R. CT-62 1.00 A.R.)






The old S256 has a buyer now and will find a new home under the hood of 1.8l turbo volkwagon.

[2.8-350TBI]

Holy crap, so far the biggest turbo ive seen to be used on a '60 so far...

Great job driver, great job!

[Driver_10]

Technically, this turbo will flow enough air to produce 650-700 whp. However, its the flow efficiency and curve, more so than the HP potential that really grabbed my attention with this particular compressor. (Ill only be running about 15lbs. Thats 500rwhp or so worth of air)

I had originally planned on using the Garrett GT3582R which was perfectly suited for rpm and flow of the 3500. (especially the superb surge limit). It blew the specs on my Borgwarner/schwitzer S256 out of the water. "The GT35 was a no-brainer"

The CompTurbo GT35 clone was less expensive than garrett and used the same fittings. After talking to the dealer, he gave me a special bargain on the triple-BB housing and billet wheel. He even included the CNC work for the compressor porting and tig-welded the V-band fitting on the exhaust housing for free.

I paid $1450 total for the whole, "custom built" package. The only final compromise that I made was on the turbine housing. The divided, 1.15 T3 was no longer available, so I ordered the 1.00 A.R. exhaust housing instead (no biggie).

Next is the matter of purchasing the dual wastegates for the new "divided pulse" design.

[Jonpro03]

I'm still having a hard time understanding how the quickspool valve is beneficial or how it even works.