On3 88mm

[cobaltssoverbooster]

Have any of you used the On3 88 mm Turbocharger?
I currently looking at the S475 with the 96 mm turbine option but i saw this On3 88 mm and was wondering what people think about it since its super cheap considering its over 80 mm on the inducer.
I am afraid of going cheap with that much compressor mass in a compressor cover that likely isn't containment certified. (?)

we would go S480 but the price cut from the S480 to the S475 is huge and we aren't aiming for 1000 hp...more like 900 (i know its still a lot to ask of the S475)

[GHuggins]

Everyone I've talked to using one of the ON3 kits trying to get anything over 12 or so psi out of them is experiencing failure after failure on the bearing setups - not sure what size turbo's they're using in their kits...

[5FDP]

I'd use the VS racing S480 clone over the On3 turbo's for a "budget" turbo.

[cobaltssoverbooster]

i figured going cheap would have boost issues on a large diameter compressor.
the gt60 and first release s500 had major shaft issues once they went over 15 psi. ill have to look into the VS S480 unit see if it makes me feel any better than the On3 unit.

I dont know if you guys have seen this yet but summit racing now sells a slew of turbos and it looks like they got Borg Warner to make the old S480 with the 88 mm turbine housing under the Summit Racing name.
I found the S475 with the new 96 mm turbine there and saw that Summit was a brand listed under the mfg. section in the filters section. got a little curious and found this...https://www.summitracing.com/nv/parts/sum-260050
they also sell the same unit with a polished compressor housing. perfect for a 4.8 or 5.3 stock engine setup for street applications in my eyes.

[ElecTech]

I've had an issue getting above 600 rwhp out of the 78mm on an LS @ 15 psi, but some of it could have been due to the poor y pipe construction. Came on hard at low rpm and fell off hard above 5500.

[Area47]

i cranked 730whp out of a 6.0 ls on pump gas only with a 7675 at 13.5 psi. 840 out of same turbo on an ls3 at 14 psi on corn. The flip side of this. I have not had an on3 live past 11 psi worth a shit. 6psi was fine. started leaning on it, and three pulls in, bam, smoke show. My advice on this, don't be cheap with the turbo. It lets go, its going to claymore the whole damn motor.

This is 5 of them in a row in two weeks that let the magic smoke out. All about 11-12 psi and all ate the bearings up

[cobaltssoverbooster]

Area did you run single waste gate to control boost down to 6 psi?
We will hunt down a billet s480to prevent issues from arising again

[Area47]

Area did you run single waste gate to control boost down to 6 psi?
We will hunt down a billet s480to prevent issues from arising again

all of the turbo setups have been single gate so far. nothing above 20 psi to date {on purpose}. Even the twin car that nuked the turbos had single gates on each side.

Most of the time i run against duty cycle limits on the controllers vs the spring pressure. i start off on gate pressure and work up from there. the 6.0 car ended up at 85% duty cycle to get 13.5 psi. started at 4 psi on the spring itself.

[cobaltssoverbooster]

makes sense...your only really supposed to be able to double the gate pressure without running boost to the top of the gate.
I haven't designed a system for an S480 yet so i didnt know if a single gate would be sufficient enough to control lower boost pressures. I would have to keep the gate fairly large to maintain low boost im sure.

Thanks