MFS 6265 turbo results 9.96@135.73 ***updated 9/19/2014***
- Thread starter bison
- Start date
Went to LVD today with my slower car and made a couple hits on my car in between tuning and helping other racers. The following parts are involved:
-High mileage stock short block bearing insets and cam bearings replaced and clearance checked. Oil pump blueprinted. Factory rings. 8.3:1 CR Exact mileage unknown.
-XFI
-champion aluminum heads ported by Russ Merritt, RJC steel head gaskets
-intake with extra port work
-3312/3312 110LS off the shelf cam
-1.65 rockers
-MFS 6265 3 bolt .85 a/r. This turbo was built with the same wheels I use when anyone orders an MFS 6265 from me. They are aftermarket wheels and there is no trickery there or special one off wheels. They are not Garrett or any other "name brand" wheels.
-precision front mount
-PAC alky from razor
-3" internal gate dp
-TH 2.5" dual exhaust
-9.5" PTC (yes Rob Zombie I know there's better out there)
-200 4-R by me. Same one that's been in the car for 5 years
-stock factory 4 link with GM installed control arm bushings.
-8.5 rear with cover, eaton LS, and 31 spline axles
-chrome moly ds with u-joints updated.
-race weight 3600+
Boost was 25-26psi in 1st/2nd and jumped to 28psi in 3rd for a couple frames at flash stall and settled to 27-27.5psi through 5400 before falling to 26psi as it hit the traps. The turbo is pretty much all in. Timing was typical of my 93/alky tunes and was under 20* from the instant the turbo was spooled. Elevation was 1100' and there was a head wind. Drove the car to and from the drag strip over 90 miles each way. These results aren't from any special parts and could be duplicated fairly easily. Plenty of 9.5:1 strokers with more turbo running slower. This turbo has 9 sec potential at sea level with a 9:1 engine in a 3500 lb car.
10.236@132.27mph
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Brian what plenum were you running on the "slow car"Went to LVD today with my slower car and made a couple hits on my car in between tuning and helping other racers. The following parts are involved:
-High mileage stock short block bearing insets and cam bearings replaced and clearance checked. Oil pump blueprinted. Factory rings. 8.3:1 CR Exact mileage unknown.
-XFI
-champion aluminum heads ported by Russ Merritt, RJC steel head gaskets
-intake with extra port work
-3312/3312 110LS off the shelf cam
-1.65 rockers
-MFS 6265 3 bolt .85 a/r. This turbo was built with the same wheels I use when anyone orders an MFS 6265 from me. They are aftermarket wheels and there is no trickery there or special one off wheels. They are not Garrett or any other "name brand" wheels.
-precision front mount
-PAC alky from razor
-3" internal gate dp
-TH 2.5" dual exhaust
-9.5" PTC (yes Rob Zombie I know there's better out there)
-200 4-R by me. Same one that's been in the car for 5 years
-stock factory 4 link with GM installed control arm bushings.
-8.5 rear with cover, eaton LS, and 31 spline axles
-chrome moly ds with u-joints updated.
-race weight 3600+
Boost was 25-26psi in 1st/2nd and jumped to 28psi in 3rd for a couple frames at flash stall and settled to 27-27.5psi through 5400 before falling to 26psi as it hit the traps. The turbo is pretty much all in. Timing was typical of my 93/alky tunes and was under 20* from the instant the turbo was spooled. Elevation was 1100' and there was a head wind. Drove the car to and from the drag strip over 90 miles each way. These results aren't from any special parts and could be duplicated fairly easily. Plenty of 9.5:1 strokers with more turbo running slower. This turbo has 9 sec potential at sea level with a 9:1 engine in a 3500 lb car.
10.236@132.27mph
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Follow up dyno with same tune as run at LVD. 93-94 degrees and 38.4% relative humidity SAE:
Over 570whp from 5100 to 5500
BPE2013@hotmail.com
Over 570whp from 5100 to 5500
BPE2013@hotmail.com
Back pressure data I aquired today. Air was about as shitty today as it was the day I dynoed. I noticed my GM style 3 bar MAP was reading 105kpa with key on engine off. Probably should be 98kpa with the crap air we had today. Anyway 28-29psi manifold pressure and approximately 40psi drive pressure. 1.37:1. This is using traditional wastegateing with an internal gate. This turbo is a lot better than I thought:
BPE2013@hotmail.com
BPE2013@hotmail.com
jpwalt1987
Well-Known Member
- Joined
- Nov 9, 2003
Back pressure data I aquired today. Air was about as shitty today as it was the day I dynoed. I noticed my GM style 3 bar MAP was reading 105kpa with key on engine off. Probably should be 98kpa with the crap air we had today. Anyway 28-29psi manifold pressure and approximately 40psi drive pressure. 1.37:1. This is using traditional wastegateing with an internal gate. This turbo is a lot better than I thought:
BPE2013@hotmail.com
Where are you taking the back pressure reading from ? Right hefore the inlet of the turbine or somewhere on the cross over pipe?
I don't know for sure. I can get boost higher than it is but haven't attempted. It's 70-72lbs/min the way it was in the above posts. Most peoples engines won't hit that mass flow with similar turbos regardless of manifold pressure. I expect the compressor cover to become a hindrance beyond the current mass flow. Probably close to being all in
BPE2013@hotmail.com
Last edited:
turbobitt
Well-Known Member
- Joined
- Feb 14, 2002
Based on this most recent data, I wonder if there could be more improvements on the compressor side to take advantage of lower than normal back pressure. Has a bigger compressor ever been done with this wheel? That would be interesting with about 35 psi boost...
AG
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Larger compressors have been done but I don't have enough data to compare to a low CR stock shortblock engine. I've ran up to a 72mm inducer with the same size and trim ex wheel and hit 77-80lbs/min @27-28psi on the engine it was on. Unfortunately I don't have any drive pressure data and that turbo had a large t76 style cover with a much larger diffuser. It spooled quite a bit slower than this 6265 though. This turbo seems to be right in line with the cast TV45 compressor and other brands 66mm inducer compressor but pressure ratio is better at lower rpm
BPE2013@hotmail.com
I plan to drive it to Cecil county in a few weeks. I'll be about 70lbs lighter and still all steel. Fixed the voltage drop off problem I had also. Should be in the 9's with no hiccups at that track
BPE2013@hotmail.com
Looking forward to the results!
OneQuikSix
Member
- Joined
- Jun 7, 2001
What type of sensor are you using to log backpressure in the stock o2 location?
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It's an SSI 0-100psi pressure transducer that i compared to a mechanical gauge and was within a few psi all the way up to 80psi. I didn't test it to 100psi
BPE2013@hotmail.com
Last edited:
turbobitt
Well-Known Member
- Joined
- Feb 14, 2002
SSI 0-100 psi sensor available from FAST, Not connected directly to the pipe but has a length of hard SS tubing to isolate it from the direct heat.
AG.
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I probably won't be anytime soon. The 6265 works so well and the drive pressure so low I don't see much gain going to the 66 turbine. Over 70lbs/min and ex pressure to manifold pressure at 1.37:1 using cold boost as the reference is very good. I'm fiddling with my car right now prepping for Cecil trying to milk every bit of power I can out of it. If I make a full pass Friday morning it should be a good day. If I get any data it will only be intake pressure vs exhaust pressure and estimated mass flow based on fuel consumption and a/f.
BPE2013@hotmail.com
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