TURBO TEST RESULTS - GTR5088R VS GTX5018R VS S488SXE
The preliminary results for our 88mm turbo engine dyno test are starting to compile nicely. For this test we have tested 3 turbos thus far on a Freedom Racing Stock block/piston/crank 6.7L/409" Cummins using a CM849ECU, fuel is 400% over S&S with two Powerflo750 CP3 pumps. Baseline tests with the cast Borg S480/96-1.32T6 made best power at 1400us/29k and showed 1501hp. We adjusted fueling to 1500us/29k when we installed the first 88mm we tested and left the ECM tune up the exact same for the duration of the tests.
After what I’ve seen thus far I would call the GTR5088 from Forced Inductions the clear winner compared to these other two, it put 75hp and 7psi of boost on its 11 blade GTX counter part when they were both in the 1.42 housing. Second place of the three chargers I think belongs to the Borg S488SXE, all things considered it’s $1000 less than either of the Garrett chargers, only has a 110mm backside on the compressor vs the 118mm and has a 3mm/3mm smaller turbine than the Garrett's have, for only falling 11hp behind the GTX, bang for the buck, I was impressed. As for the GTX5018, it made the best power for a “box” charger and did a lot better than the 488SXE at the higher RPM sample point where the smaller wheels on the SXE began to choke and run out of steam but given the fact that the GTX is the exact same price as the GTR and under performed the GTR, I have to place it in third place.
DATA:
Forced Inductions GTR5088 7/7 blade 88/118 compressor. Turbine is a 99/91. Turbine housing was T6 divided 1.42 and 1.32. Rated at 1650hp and costs $3399 w/out housing
1.32 housing:
1843hp/2420tq/67psi boost/77psi drive at 4000rpm.
1818hp/2076tq/63psi boost/80psi drive at 4600rpm.
1.42 housing:
1833hp/2406tq/66psi boost/65psi drive at 4000rpm
1816hp/2073/62psi boost/70psi drive at 4600rpm
Garrett GTX5018r - 11 blade 88/118mm compressor. Turbine is a 99/91. Turbine housing was T6 divided 1.42. Rated at 1600hp and costs $3399 w/out housing.
1.42 housing:
1758hp/2309tq/60psi boost/60psi drive at 4000rpm
1721hp/1965tq/56psi boost/63psi boost at 4600rpm
Borg Warner SXE S488/96-1.32T6- 19blade 88/110mm compressor. Turbine is a 96/88mm. Turbine housing was a 1.45 divided T6, we also have 1.32 we have not yet tested with it but drive pressure was already "high" with the 1.45ar so we decided not to bother with 1.32 due to the engine speeds we were testing at. Rated at 1575hp and retail costs $2248 w/out housing.
1.45 a/r housing results;
1747hp/2294tq /62psi boost/74psi drive at 4000rpm
1687hp/1926tq/57psi boost/76psi drive at 4600rpm