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I found some old dynos and comparisons of spool etc and overlayed the USP Alpha 3071 on E85 vs the Alpha 3076 (prodigymb car) and Alpha 28s and K16 billet and K24.
Apologies for steaing this from an old thread but I guess at 21 psi on E85 the A3076r will be somewhere in the 620-650 whp area and look more like the red line on the USP A3071 curve below at that boost level
Last edited by wolfhedge; May 1, 2015 at 09:43 AM.
Looks like the boost comes on really well with the 3071s with the additional upgrades! And the 3076s looks very strong overlaid with those smaller turbo setups...I wonder how much that has to do with the E85?? Tune? Can't wait to see how these 5431's do on my car!!
Not sure on that. But it similar to a 3076 on the front side...just a 54mm inducer (76mm exducer) not 56mm and on the back side it's similar to a TD06 with a 57mm exducer. It should flow more than a 3071 and maybe even close to a 3076 since the turbine wheel is a little bigger but not sure. I chose the bigger a/r as well do it should be pretty efficient.
If you are building a track car, go with 71's. 76's obviously have a better top end and are worth it in my opinion, the difference I noticed was not huge (had both).
To put in perspective I would have never bough 71's to start with.
If you are building a track car, go with 71's. 76's obviously have a better top end and are worth it in my opinion, the difference I noticed was not huge (had both).
To put in perspective I would have never bough 71's to start with.
My 3076 with sub 4k miles are for sale.
why are you selling it?
i might be interested please pm me for price
If you are building a track car, go with 71's. 76's obviously have a better top end and are worth it in my opinion, the difference I noticed was not huge (had both).
To put in perspective I would have never bough 71's to start with.
Juts did some pulls and datalogged... really weird, less boost than last year when temps were 30*F warmer and audible knock at 4000 rpms on WOT in 3rd and 4th gear but no knock registers on the datalogs at those levels.
Am getting minor knock at 3000-3200 rpms on datalogs.. weird
People always get too fixated on X amount of boost. Boost is just one of the variables in tuning. Boost is only a measure of restriction in itself and doesn't represent airflow which is what you should be discussing instead as 20psi on a oem vtgs is very different from 20psi on say 3076s or 3794s. Also you HAVE to consider ignition timing in your discusion and how that's ramped in and if there's knock. You simply can't say X psi is what any given setup can run without talking about everything else in a tune including valve timing and overlap, ignition timing, octane, MAF. If you throw a bunch of timing at the motor in the low end and say the motor isn't knocking because E85 is a wonderful thing you have to be careful as your cylinder pressures are considerably higher and stress on rods is greater.
Its not and never just about boost. Be nice with your low end timing folks and try to run a tune where you can monitor knock across the entire motor not just cyl 1 with a durametric especially if pushing.
Dzenno@PTF
Last edited by proTUNING Freaks; May 1, 2015 at 02:01 PM.
People always get too fixated on X amount of boost. Boost is just one of the variables in tuning. Boost is only a measure of restriction in itself and doesn't represent airflow which is what you should be discussing instead as 20psi on a oem vtgs is very different from 20psi on say 3076s or 3794s. Also you HAVE to consider ignition timing in your discusion and how that's ramped in and if there's knock. You simply can't say X psi is what any given setup can run without talking about everything else in a tune including valve timing and overlap, ignition timing, octane, MAF. If you throw a bunch of timing at the motor in the low end and say the motor isn't knocking because E85 is a wonderful thing you have to be careful as your cylinder pressures are considerably higher and stress on rods is greater.
Its not and never just about boost. Be nice with your low end timing folks and try to run a tune where you can monitor knock across the entire motor not just cyl 1 with a durametric especially if pushing.
Just had this discussion elsewhere guy claimed that adding a bar of boost couldn't do more than double the NA horespower of a motor. Physically impossible he said.... Wrapping one's head around boost being a measure of restriction and two different turbos making different levels of power at the same boost level takes a little getting used to! Having had an early experience with a belt driven blower years ago and a serious head port job reducing measured boost by multiple PSI while power went up I got to experience it firsthand
BLKMGK I think my charts above are apples, oranges, apple sauce and tangerines but give some basic spool up and power ideas which was the reason for them.... basic timing on E85 makes up a good portion of the gains vs other gas at the same boost but I hear you re other engine work.
For now I am looking at a basic addition as Tim is mega busy and I do not want to leave my car for months on a build.
BLKMGK I think my charts above are apples, oranges, apple sauce and tangerines but give some basic spool up and power ideas which was the reason for them.... basic timing on E85 makes up a good portion of the gains vs other gas at the same boost but I hear you re other engine work.
For now I am looking at a basic addition as Tim is mega busy and I do not want to leave my car for months on a build.
if it were me (and god knows i never do what i should!) i would wait until winter when tim's work slows slightly and your not driving the car as much. its worth the wait to have him do the build and allows you to drive the entire summer and gather parts and research all summer. just an idea
having said this i have 2 drivelines in the garage and 2 rolling chassis in the driveway with body panels at a shop for painting!
He's usually busier in winter lol, but I have decided to do the Alpha 3076 and tune it for 650 rwhp and lower torque and timing in the 3800-4500 rpm range and run boost to about 20 psi above 4500 rpm on a ramp and see how that feels. This will keep my missus happy as she scrutinizes every car $ I spend (then turns around herself and buys mega diamond jewelry) but you get the drift.
I will either go E30 gas tune or a straight E85 tune as I love using the stuff.
Tim and Mark use racewear studs and as such the engine would need to come out a few times as they are retorqued and that means time and time so will worry about internals some other time as Powell has shown me that he can run much more torque and power on internals on a 996 TT with stock internals and even rev it to 7400+... I only ever rev to 6900 or so max and as long as I am conservative it will serve me well for the next 6 months or so at a higher level of power than I am on now and give room for the next step.
And the 3076s looks very strong overlaid with those smaller turbo setups...I wonder how much that has to do with the E85?? Tune? Can't wait to see how these 5431's do on my car!! 
