MFS 6265 turbo results 9.96@135.73 ***updated 9/19/2014***
- Thread starter bison
- Start date
This is how you sell turbos! LOL.
turbobitt
Well-Known Member
- Joined
- Feb 14, 2002
This is believing in the product you build and sell. He also does one heck of a job on transmissions as well if you guys didn't catch that little phrase in his original post.
AG
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pmoore4321
Member
- Joined
- Jan 10, 2010
8.3:1 was the final CR?
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 Brian I had intended to use RJC steel head gaskets taking me from 8.51 :1 (with cometics) to ~ 8.75:1 (with steel shims) and didn't have the nerve to do it thinking my aluminum cylinder heads would have the decks all tore up.
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Brian: Really glad to see these results using the 6265 turbo. I got one of the first ones out from PTC and they were not held in very high regard until you did some testing of several turbos and the 6265 performed much better than most thought. I still have mine and recently had it freshened up, didn't know about your MFS 6265, along with the TC and the tranny. Spent the last 2 years fixing a LONG list of problems and think they have all been fixed.
Believe my car's 10.37 @ 132 was fastest run for a factory block running a 6265 for the past couple of years and a lot of the credit for that was the advice and guidance you gave me. Congratulations on raising the bar.
Phil Engle
Results would be the same but at a slightly higher pressure ratio till the ex pressure was equal. Unfortunately I don't have an actual backpressure log or I could say with more accuracy where you'd be. Typically you see people posting about how little boost they ran to achieve a number. In reality the ex pressure is just as important part of the equation to see how much there is left. If I were to change nothing on that engine except for the heads id expect the same at 29-30psi at that elevation and that tune. There is probably 2 mph left in it the way I had it if I ran at a drag strip like Cecil county or atco and had the fueling nailed down 100%.
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Keep picking away at it and run it in good air and look for 9's. More than possible in a 3600lb car
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I aired it out on one of those Mexican highways using a new tune and compared that pull against my 10.37 run going from 40-128 which is the speed limit on that highway.
ET from 40 - 128 was .187 faster than best time even with a 2-3 shift at 66 MPH which increased the time from 66 to 85 by .24 second. Not sure how much that cost but I suspect it would be quite a bit. Boost was 3-4 lbs lower than best time and car was pretty sluggish in mid range.
Car is getting a break for now. Like to get some more driving miles on it and need some dry Friday nights. We can certainly use the rain but I'd like to get one TnT night when it's low 80's and a gentle breeze that is on my side. Next Friday night forecast is looking pretty good.
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What evidence would make you think that? Certainly nothing I've ever seen posted here. I think it can do 134-135mph at sea level in good air with 93/alky on a stock bottom end at full weight. Maybe 137-138mph on a 10.0:1 engine built around it in good air with good fuel. I don't think it can push a full weight regal to 138mph and certainly not 140mph in just any engine/car or anything I've seen posted on this forum. Maybe one of the TSM racers with a cam change it could run closer to 140mph but those racers are well ahead of what you typically see posted on Internet forums. I haven't even seen a 3600lb aerodynamic new import run 138mph with a 62 compressor even with a manual trans and they typically run higher mph with manual transmissions. I know of one Subaru who trapped 133mph with a 62 compressor and boost in the low 30's. His e.t. was only a 10.6x. It was an e85 application and the tune was quite a bit leaner than I'd have run. The same car at 35-36psi recently dynoed approx 50whp more with the 62 but hasn't ran it again at the drag strip.
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No evidence, was told from a reliable source the 65mm wheel has supported 138 and some change (not sure of weight) and didn't think the 62mm compressor wheel was the cork. I went 134.xx with the 65mm exhaust wheel and a cast 67 which I thought might be inferior and am confident it has at least 3-4 mph in. But I'm not at full weight either. Just didn't know how much more you have in it as is.
If this is your slow car, how fast is the fast car?
If this is your slow car, how fast is the fast car?
65mm ex wheel has been over 140 with larger compressors. Cast 67 has been 140 also. My faster car has been considerably faster and has the potential to be considerably faster than it has been.
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