ko_gsr

hey im currently building my gsr up for boost and i am going to run a holset h1c im just curious what kinda numbers people were seeing with this turbo

TheShodan

iTrader: (14)

Head to the "Holset Users, UNITE" forum.

https://honda-tech.com/forums/forced-induction-16/holset-users-unite-1225182/

You'll find answers there. BEWARE, its long, but informative.

ko_gsr

thanks i check it out when i have time to read all 101 pages hot damn ha

wantboost

iTrader: (2)

Its not the best choice, very narrow compressor map, small efficiency island that's in the lower part of the map and stops at 1bar of pressure.

Also, its only 71% efficient at most, you'll be in the lower 60s all of time. Map only flows to 36kg/sec at its limit so don't expect magical power. You'll more than likely have a huge issue with surge and choke, due to how narrow and inefficient the map is.

Couple that with a huge turbine wheel and even bigger turbine housing and you have a very laggy car that makes very little power

wantboost

iTrader: (2)

The compressor map

mar778c

iTrader: (1)

OP,

I run a H1C, here's my setup.

Drivetrain-
Block- B18C1,
OEM gsr crank
GSR Eagle rods
81.5 mm 11.0:1 CP pistons (PTW 0.0045")
OEM main bearings (bearing clearance 0.002" except the middle which is 0.0022")
ACL rod bearings (bearing clearance 0.002")
Head- B16A2, stock port, stock valves
VT- Supertech springs H1002D, and 2002 rsx type-s retainers
Cams- Pro2 intake and Blox C exhaust
TB- Professional Products 68 mm
Ignition- Stock Dizzy, wires, and NGK 8's
Fuel Delivery- Walbro 255 and ID1000
EMS- OBD-1 converison, chipped P28, neptune'd
Trans- S4C, cable to hydro bracket, and CC stg 4 clutch

Turbocharger-
Turbo- Holset H1C model 3531456, 18 cm^2 exhaust housing with 3" v-band (DIY)
Manifold- Mini-ramhorn 1.5" sch 10 fitting (DIY), (Importdps)
Wastegate- Tial 38 mm
Oiling- GE Vtec sandwich plate, -4AN stainless braid (feedside), 12 mm x 1.5 to -4AN flare, -10AN stainless braid (return side)
Hotside charge piping- 2.5" Aluminum piping (Dynamic Performance)
Coldside charge piping - 3.0" ALuminum piping (Dynamic Performance)
Intercooler- Precision 600 Hp (Importdps)
BOV- Tial 50 mm
Map sensor - GM 3 bar
Downpipe- 3.0" stainless steel (IMW)
Exhaust- 3.0" stainless steel (Synapse Motorsports)

Here are the dyno plots.

Cast piston at 11 psi vs forged at 14 psi.



Boost plots: 11 vs 14 psi


Lol, it does not work.

ko_gsr

thanks for all the info, im not looking for crazy number either so well see if this turbo suits what im looking for if not i can always upgrade

wantboost

iTrader: (2)

You can see my concern with the turbine side is on that dyno sheet. That same wheel with a smaller exhaust wheel, more suited for gas applications would spool wonderfully.

extremeracer

There are much better Holset combinations out there, look for HX35 7-blade with a 12cm2 housing.

Even a HY35 if you have modest power goals