Any reviews on these turbo?

 

The G42 and the 9280 are very very new to market so there's probably not many cars running them as yet. And based on past experiences, Garrett's new releases and BW's EFR range have both suffered initial supply problems.

If looking at the compressor map the 9280 looks very very promising - it's much wider than the G42-1200 and has better high-pressure ratio efficiency. The 9280 will support 100 lb/min up to a PR of 4.0 whereas the G42-1200 only support 100 lb/min up to ~3.6. For a 4G63 that typically runs high boost pressures the BW looks like a better fit - at least on paper.

I believe English Racing are running a 6785 on their Evo X and there are a few K-series Honda engines also using this turbo to make ~1000whp, PTE don't supply flow maps or ratings but we know their Gen 2 stuff make crazy power versus wheel size...

The turbo world is certainly very interesting right now

 

The 6785 certainly does work on the English Racing EvoX, right around 1050-1100whp all-in running methanol. The real question is what is your power/performance goal for the car?

 

There could be question marks around the flow potential of the EFR9280's hotside, if it CAN support the crazy compressor flow they are suggesting then it is likely to be a complete beast of a turbo in terms of flow versus response.

 

The 6875 is going to out-perform either of the other two turbos mentioned, hands down. I currently have a 6870 on my Evo. I have made 50psi with it and it still has more boost in it. I have found that the Precision 6870 consistently outperforms even an FP Super99 because the Super99's turbine wheel is too small and back pressure goes through the roof at big boost pressures with that turbo. BTW, I had a 6466 on the car before switching to the 6870 and have found that spool up between the two is almost the same with the 6870 giving up maybe 300-400rpm at most. On the street its hardly noticeable.

 

Probably worth adding here that max power is only one criteria for performance. EFR9180s are more responsive than 6466s, so if the turbine ends up supporting the flow of the new EFR9280 compressor wheel without too much cost to response then you basically have something pretty hard to beat. I wouldn't be surprised if the 6875 would be capable of more outright power, though.

 

The response time between a 9180 and a 6466 is almost indiscernible. Both turbos will respond within 100-200 rpms of each other in similarly sized turbine housings. I don't see the 9180 having much of an advantage here at all. And as far as overall power is concerned, the 6466 will kick a 9180 into the weeds for top end power.

 

OK, I know of people who have upgraded from the 6466 to the 9180 and been happy with the outcome - I guess there could be a whole different debate of transient response versus threshold... and I wouldn't be surprised if the 6466 had a minimal edge on flow (kick into the weeds however sounds ambitious) so if we just treat it like they are basically comparable, the initial point I was making about the fact that while the EFR9180 compressor can provide 90lb/min with 60% compressor efficiency at PR3.5, and the EFR9280 can provide 110lb/min at the same point. That's a different level to the 6466... probably more 6870 territory, and kinda highlights which I said what I said.

If the EFR9280 responds similar to the EFR9180 and the hotside flows well enough to support the compressor then it'd offer a better compromise of response versus power than any of the other options and be pretty hard to ignore for someone hooping to nudge ~1000whp.

 

I have decided to go for a 6875. awaiting delivery from realstreetPerformance. This will be an upgrade from my Gen1 6466.Lets see how it goes.i will be running it with pump gas

 

Any updates on the 6875?

 

got 890bhp on a dynapack at tcf 1.25. was a pretty laggy turbo without e85 or race gas. went a different route immediately and sold of the turbo.

i am running a Fp zero now which make decent pump gas numbers with decent reponse. 650whp on dynojet. 745whp on e85 and ran out of injectors. 1650cc FICs.

 

Wow, 1.25 TCF is massive - that'll be showing a number significantly more than the engine is even making! Dynapacks are already pretty close to flywheel

 

On the 6870 exhaust side, are you running the T4 twinscroll housing? What A/R ratio?

 

I agree. My car Doesn't represent well of what the turbo is capable off. Even with that low power I'm getting, I have shifting issues on my gearbox.

 

0.96 open T4