Mike Licht
I was here first
- Joined
- May 23, 2001
we have a polisher and a coating guy here close. If you want to send it we can get it done.
Precision 6870 Gen2 CEA
- Thread starter BEATAV8
- Start date
Nice!!
just to throw it out there i only ceramic coated the outside of the ex housing on mine,didnt want any issues with the turbo and i haven't had any.maybe others have experience with internal coating.
chris kirk
Active Member
- Joined
- Jun 1, 2013
Thanks for the info. Appreciate it. Would I send you the housings or the entire turbo? Or doesn't matter?
BEATAV8
The Engine Whisperer
- Joined
- Feb 14, 2002
Here's some early boost/back data for the 6870 turbo in the pics. 3 bolt .85 turbine housing.
270 cu in stage II motor, GN1R heads, 224/224 hydraulic roller, ATR headers, 3.5" DP. 2ooR4 trans with PTC converter. E50 fuel (E85 with some pump gas mixed in)
386hp 8psi boost 17psi backpressure
444hp 11psi boost 23psi backpressure
465hp 12psi boost 26psi backpressure
525hp 15.5psi boost 31psi backpressure
577hp 16.5psi boost 33psi backpressure
613hp 18.3psi boost 38.5psi backpressure
655hp 19.3psi boost 39psi backpressure
270 cu in stage II motor, GN1R heads, 224/224 hydraulic roller, ATR headers, 3.5" DP. 2ooR4 trans with PTC converter. E50 fuel (E85 with some pump gas mixed in)
386hp 8psi boost 17psi backpressure
444hp 11psi boost 23psi backpressure
465hp 12psi boost 26psi backpressure
525hp 15.5psi boost 31psi backpressure
577hp 16.5psi boost 33psi backpressure
613hp 18.3psi boost 38.5psi backpressure
655hp 19.3psi boost 39psi backpressure
spool time with that kind of backpressure and e50 fuel?
- Joined
- Jan 18, 2011
Which ptc converter if you don't mind divulging ?
BEATAV8
The Engine Whisperer
- Joined
- Feb 14, 2002
9.5" I'm sure
BEATAV8
The Engine Whisperer
- Joined
- Feb 14, 2002
not yet known.
GNBRETT
Pelennor Fields
- Joined
- Feb 8, 2004
can u post the dyno chart? interesting numbers from 18-19 psi. 42 hp. back pressure is climbing tho. be interesting to see wat difference the back pressure wud b with the 4 bolt.
- Joined
- Jan 18, 2011
I figured, I was thinking more of 17,18,19 blade?
BEATAV8
The Engine Whisperer
- Joined
- Feb 14, 2002
Sorry gents, I don't have any more info/details than what's posted. Car belongs to a buddy that's on here only occasionally. I expect he will probably run the fuel out of it now and refill with straight E85 and then continue to increase boost into the 23psi area where I expect it will be well over 750hp.
I found it very interesting that the back:boost ratio is 2:1 even at low boost pressures and low power levels. I am wondering if that is caused primarily by the turbine housing, or if it is caused by the large compressor wheel loading the turbine, or just both together.
I found it very interesting that the back:boost ratio is 2:1 even at low boost pressures and low power levels. I am wondering if that is caused primarily by the turbine housing, or if it is caused by the large compressor wheel loading the turbine, or just both together.
- Joined
- Jun 28, 2001
My 68 wheel makes that much backpressure
rpm is also a major factor
toomanymodz
Well-Known Member
- Joined
- Oct 14, 2009
My 6466 makes about 30psi back-pressure at 20psi boost. Whereas that baby is at almost 40psi back-pressure. Hmmm.....
