Heard many say these aren't legit 76mm turbos and they they basically lied to everyone. The rumor is the new turbos Borg produces are using the exducer size of the turbo to classify it. So that its likely a 56/76 compressor or similar and not a legit 76mm unit. same with the 67mm turbine wheel. Any facts on this?

I was able to find the borg warner PN. Its 18679700009. But of course there is no infomration this thing anywhere other than many mentions of it being a "76mm unit". I thinking the rumors are true.

 

This is basically the same argument and or discussion regarding the turbine wheel too right?
Some folks reference the exducer and some reference the overall size of the wheel which leads to confusion.

 

RIght. I just felt we wer eall beign lied to as in every single article and video i've seen they all brag about the 76mm turbos and how they are "biggest OEM turbos ever used in s priduction vehicle". etc Even when asked what size turbos were on teh cars the GM engineeers claimed "76mm". Which it sounds like isn't the case at all. Sounds like a marketing ploy.

 

Isn't that how borg usually labels theor turbos? Using the bigger of the wheel diameters?

 

All the borg stuff is labeled that way, it's just the rest of the vendors have switched to using the more conventional way. Look a the BW EFR stuff I can never tell wtf I'm looking at lol

 

Don't believe so. At least not the Borg turbos I bought. They always did it with the turbine wheel, not the compressor. My S475 had a 75mm inducer and a 100mm exducer on the compressor. So do I get to say I have twin 100mm turbos now? lol. I guess thats more impressive sounding.... My S480 had 110mm exducer... its that a 110mm turbo now?

IDK just rubbed me the wrong way I guess. Thought it was crappy that GM is claiming they have massive 76mm turbos, and even bragging they are the biggest factory turbos ever installed on an OEM car... when they really don't.

 

You are correct, just the turbine was that way, but only on the S series stuff for some reason (probably just different engineering team bs). IDK the GM turbos have to perform decent to make the power they do on a 5.5l v8 using high flowing heads and high rpm they are running. They might tap out early when turned up though, but I don't see any OE company wanting to deal with turbo lag on a production car. Looking at the photo of the turbo above I'd guess GM is tapping into some of the EFR tech it looks like one.

 

Well and now they've launched the ZR1X which is even nuttier.
That's what always got me on the BW stuff too, they call the turbine a 96mm but really the exducer is 88mm so it always threw me for a loop.

 

Yea, I’ve had been following the ZR1X monster too. Amazing what an additional 186 hp and 145 lb‑ft to the front wheels will do. Esp when its instant power. Or thats what they claim the OEM cars will have anyway. It did seem to take a team of GM engineeers and tuners to get it to run those times though. I wonder if thats an accurate representation of the power and performance that will be available to the public. Or if they tuned it on the ragged edge to get those times and production cars won’t be at quick.

I just picked up a P100D Tesla for a daily. The EV stuff is no joke! It feels ridiclious having 900ftlb on tap instantly. Even in a 5500lb car, its absolutly mental. Would love to have it in a car half that weight. There are guys in europe that have hacked the operating systems on the teslas and there is a TON of room to crank them way up if longevity and warranties aren’t a concern. Wonder if GM did something similar to get those 7 sec runs.

 

yes. the turbo is almost same as EFR7670. ZR1 uses smaller turbine side, i seen somewhere say it was 67mm in their data.

 

The "EFR7670" is really a 57/61. Sounds about right to me. I'd be suprised if it were a 67mm compressor.

 

67mm turbine side not 70mm as per efr7670

https://www.borgwarner.com/docs/defa...rsn=52e3d53d_1