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whiskey_business New Reader
12/24/17 11:34 p.m.

Came upon a large number of turbochargers, new-in -box, very cheaply. Looking to spread the love to some GRMers. Couple varieties, one capable of ~225hp and one capable of ~350hp. Oil cooled, so fewer lines to run, and dead-nuts reliable. Used these things for development work, just couldn't kill them. Asking $250 for the big ones, $200 for the smaller ones. I can provide data for them if that tickles your fancy. Feel free to negotiate on price, I'd love to see more boosted Challenge cars.

Donebrokeit SuperDork
12/24/17 11:36 p.m.

More specs please.

whiskey_business New Reader
12/24/17 11:51 p.m.
  • Journal Bearing
  • Cast Wheel
  • T25 Flanges
  • 5-bolt turbine outlet
  • Internally gated, include actuator and compressor out hose.


Ill have to measure and take more pictures tomorrow, but as I recall:

  • Fairly tight A/R (bad for efficiency, good for response)
  • Smaller turbos 48mm wheels
  • Larger Turbos 65mm wheels
Patrick MegaDork
12/25/17 7:58 a.m.

Please provide the info/pics/whatever i’m inteRested in multiples depending on the numbers

Dusterbd13 MegaDork
12/25/17 8:55 a.m.

If i had actual money, id be grabbing a big one.

Javelin MegaDork
12/25/17 9:11 a.m.

How many of each do you have?

minivan_racer UberDork
12/25/17 11:00 a.m.

In for more info.

bluej UltraDork
12/25/17 2:00 p.m.

Curious about a pair of the larger.

whiskey_business New Reader
12/25/17 9:38 p.m.

Update on the lot, took inventory this evening. 

  • 2 HP65 (larger size), upsized wastegate.
  • 5 HP65, upsized turbine housing
  • 2 used HP65, upsized turbine housing and wastegates. I'll sell at reduced cost, if no one wants them they go on my SN95.
  • 1 HP55 (weird in between size, good for ~275hp)
  • 7 HP48 (smaller size) 
  • 3 High-Temp HP48, inconel turbine and SS? Exhaust housing

Will take a few housings off and measure wheels tomorrow, this is the lot now. 

Merry Christmas everybody, hope you guys are all enjoying yourselves,

bluej UltraDork
12/25/17 11:24 p.m.

I'm interested in the used pair. When do you think you'll have measurements/pics of the compressor wheels?

whiskey_business New Reader
12/26/17 8:27 a.m.

In reply to bluej :

This evening for sure, possibly sooner. 

If anyone interested could request dimensions for them, I'll dump all of that stuff at once later. 

whiskey_business New Reader
12/26/17 8:49 a.m.

Compressor Map for small units:

Compressor Map for Large Units:

AWSX1686 Dork
12/26/17 9:00 a.m.

That's quite the pile of turbos!

whiskey_business New Reader
12/26/17 10:51 a.m.

In reply to AWSX1686 :

I know, it was a Christmas miracle!

dherr Reader
12/26/17 12:16 p.m.

Can you show a picture of the High-Temp HP48? That might be  a good match for my 1.8 Miata where I am just looking to provide some boost to fatten the torque curve,  not looking for extreme power levels on my Spitfire project.

whiskey_business New Reader
12/27/17 8:51 a.m.

Sorry for the delay, here is the big data and picture dump you all were waiting on,

HP48 High-Temperature


  • Compressor Inducer 34mm
  • Compressor Exducer 48mm
  • Turbine Inducer 43mm
  • Turbine Exducer 34mm

Used HP65 Pics:



  • Compressor Inducer 45.5mm
  • Compressor Exducer 60.5mm
  • Turbine Inducer 44mm
  • Turbine Exducer 34mm

Got some beauties of the HP55, but didn't want to take it apart to measure. It is somewhere in between the other two. If anyone is really interested I'll pull it apart to measure. 

If anyone has questions about anything including compressor maps, shoot me a message. I've whipped up some spreadsheets to calculate airflow and pressure ratio requirements based on engine parameters.

dherr Reader
12/27/17 9:46 a.m.

So if I am just looking to mildly boost a NB Miata 1.8 (think similar to a Mazdaspeed Miata) so I can bump up the stock HP and torque to similar levels, it would look to me that the smaller turbo would be more than sufficient to allow for quick spoolup and get me to my goals. I am not looking to make 200+ HP as it is not necessary in my car as it will weigh under 1700 pounds. Stock NB motor is 140 HP and 119 ft-lbs, my goals would be to get 185 HP and 165 ft-lbs at say 7-8 pounds of boost?

So not being a turbo expert (but i will pay for a tune and probably convert to a megasquirt ecu), what do you think the High-Temp HP48 would meet my goals?

How do you want to be paid, paypal okay?


bluej UltraDork
12/27/17 10:51 a.m.

Just sent you an email through the board software. Let me know if it didn't come through.


whiskey_business New Reader
12/27/17 4:29 p.m.

In reply to bluej:

Got it and replied. 

whiskey_business New Reader
12/28/17 7:33 a.m.

In reply to dherr :

I think one of these would be a great fit, the map would lead me to believe it will make the power pretty easily and the wastegate should be set for 7lbs already. And yes, PayPal is ok, shoot me a message over the board so we can figure all that out.

dherr Reader
12/28/17 7:56 a.m.

Message sent

dherr Reader
12/28/17 2:28 p.m.

Just ordered mine for the Spitfire project https://grassrootsmotorsports.com/forum/build-projects-and-project-cars/rat-rod-1972-mk4-triumph-spitfire-project/132550/page1/

Also ordered a manifold and oil feed and drain lines as I have the oil pan off the engine right now and this is the time to drill and fit the drain before I test fit everything and put the engine back in the chassis. 

hobiercr SuperDork
12/29/17 12:31 p.m.

Would the HP48 be too large for a 1.3/1.4L?

Robbie PowerDork
12/29/17 12:50 p.m.

Is it a subaru downpipe flange?

Robbie PowerDork
12/29/17 12:57 p.m.

also, what is the unit on the small turbo compressor map? CFM? and does anyone know a rough rule of thumb for kg/s to CFM in a turbo compressor map application?

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