Went back and made some more pulls with the 6176 and the 6265 yesterday. Wanted to get both on the same day with the same air. Had very uninteresting results. I took the last 2 pulls (which were the best) from each turbo and got the boost as close as i could on each comparison pull. With 21* advance and the 6176 made 468.61 peak hp and the 6265 made 466.59 peak hp. The peak hp did not occur at peak boost for the 6265. It was at around 26.5psi at its peak hp. The 6176 was at around 28.2psi at its peak hp. The 6265 started to boost creep over 5500rpm and peaked right before i aborted the run. The wastegate hole was untouched and as received from Precision. The 6176 showed the opposite effect and actually started losing boost slowly from about 5200 on, dropping to 25psi at the same spot the 6265 had over 28psi. The 6265 showed about 11 more hp at the same spot on the graphs where it hit peak boost. With 22* advance the 6176 made 475.81 peak and the 6265 made 473.63 peak. Both made peak power at almost the same exact rpm and boost was 27.1 with the 6176 and 26.3 with the 6265. The 6265 showed the same boost creep toward the end of the pull as the lower timing runs and made more power there again. The 6176 .63 Garret combo spooled considerably faster than th 6265 turbo even though the 6176 is a journal bearing and the 6265 is a ball bearing cartridge. The 6176 hit 27psi by 4600 rpm and the 6265 hit 27psi at about 5200rpm. This tells me that the PTC 9.5" i am using needs a slightly different pump to achieve the same spool rate with the 6265. Given these conditions the 6176 would likely out e.t the 6265 if both were launcehed at moderate boost levels of around 8-10psi or less. i did not road test them but the 6176 would likely hit a lot harder on the butt dyno looking at the graphs and comparing boost and rpm. The 6265 would likely out mph the 6176 in all instances based on the boost not falling as rpm climbed with the 6265. If the 6265 were launched and hooked over 10psi it would likely out e.t the 6176 since it would be into the effective boost range much quicker. For all runs the ambient temp was between 70 and 74. Barometric pressure was really good at 30.1-30.2. Charge air temps were almost linear on all tests and dipped to around 8 degrees below ambient on all pulls and slowly creeped up a couple degrees throughout the pulls. I had a considerable amount of tension on the wastegate arm for the 6176 pulls and a lot less for the 6265. If i needed to i could have easily cranked the 6265 over 30psi. The 6176 started hitting a lot of backpressure at 25psi and it was hard to get it to 27psi. I also attempted to test a PT53 but could not get the boost over 22psi due to a poorly sealing wastegate puck surface. Ill have to grind that one flat and re-test.
Interesting turbo/dyno test tonight= bigger isnt always better
- Thread starter Otto J
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This car has an old SMC from the early 2000's with a single 15gph nozzle. Its getting a PAC soon though. A/f was 11.0:1 on the xfi for all tests posted here.
Ok. Thanks Dave. Ill email you the addy to send it to. Does it have a heavy actuator spring with it?
the tnectics.63 looks on par with the garret.63.maybe try that small housing on the 62/65.the pte.63 is much bigger than the garret .63 which along with the slightly smaller comp wheel is probably why your seeing that 61/76 out spool the 62/65bb.i ran the tnectics 62/65 for a while with the t.63 and it was super fast on a 10.5 inch converter.
between 490 and 500 for all the pulls mentioned.
Yes a PTE .63 is not .63. Its over .7. If someone has a Garrett .63 and its cut for a 65 trim and wants to send it ill test it. Never seen one though. If you had a looser down low 10.5" i could see it spooling faster but even with this engine id likely drive over just about any 10.5" LU converter out there that will spool these turbos. If the converter flashes to over 5100 it will hurt power.
pontiac69fb
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This thread really delivers. Keep it coming I really enjoy reading the progression of the tests I think this should be a sticky in the turbo section.
ttypewhite
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When are you guys putting Brett's car on the dyno? I am very interested in those results cause my Dad has a mirror setup in his GN. That thing should rip some sweet numbers.
GNBRETT
Pelennor Fields
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We made some pulls the other night. It definately wants boost to perform optimally.
Brian or Otto could probably remember better but at 27 psi it made 622 hp, at 28 psi it made 652 I believe and at 29 psi it made 680. It's picking up approximately 30 rwhp per pound. It was still climbing. Not sure at what point it will start to flatten out. Brian thinks somewhere over 35 psi but I doubt I will try to find out since it is just a street car. Q16 in tank.
We might turn it up a few pounds over the next couple days and torture it to see what it can do tho.
It needs a slight alignment after all the suspension mods but Brian and I took it out for a little spin the other night at 20 psi and it spolled up a lot quicker then I thought it would for such a big turbo on a stock stroke motor.
It was pretty instant once my foot mashed the pedel. I was just easing into it most of the time to just a get a feel for it. Its very strong even at 20 psi.
You state "such a big turbo". What turbo are you using? Once my car is together i think Otto's is where it's going to go for the tune.
D
D
Its a 72 HPS BB with a .81 tangential housing. It definitely wanted to be cranked up.
71 billet wheel Precision bb
TURBOPOWERED68
David
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Have you guys done any of these tests using a PowerPlate?
ttypewhite
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Congrats Brett, those are some pretty stout numbers. You must be pleased. What was the torque numbers? Have you done a comparison with the coil on plug setup as yet? Lastly, whats your view on the RJC 4" system? Congrats again bro, that's definitely going to be a handfull.
Pronto
No amount of evidence will ever persuade an idiot.
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Brett, do you have a link to the engine build or can you give some specs. Those #s are impressive.
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