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09-05-2015, 11:58 AM | #1 |
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GTX2867r vs GT3076r
It is my understanding that the GTX series flows better at higher pressure.
Lets say stock block what kind of pressures will pull similar power numbers between these two turbos? Which turbo will provide the most area under the curve at say 350, 400, 500 whp? how high can you safely go with each on 93 pump gas? |
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09-05-2015, 03:52 PM | #2 |
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I have the gtx3076r @ 7psi WG spring but it's closer to 8psi boost on 93 octain and love it. All I hear is the turbo starting to spool around 2500 rpms. Psht....
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09-05-2015, 07:27 PM | #3 |
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I suggest plotting points on a compressor map. Make sure that the additional flow is actually a part of the map your even going to use.
http://www.atpturbo.com/root/release...76Roverlap.jpg Nice gains in the top right sure but do you get there?
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09-05-2015, 07:40 PM | #4 | |
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I'm not a shop using this for a business expense or for product development, so I'm not tearing the motor out of my 2015 BRZ that I've just began enjoying unless something goes wrong. With that said, I am just not happy with 280 whp and fear that with my turbo I can only pull maybe 320 with E85. I would like 350 whp, but I don't want to have to buy a third turbo after the motor goes for building. I am assuming that I would need to at least slightly lower compression to pull 600. I don't believe the GTX2867r can get me to 600whp, and I believe the GT3076r will be more efficient for the lower 350 target but still be enough to get me to 600 or at least close enough to dissuade me from spending the extra cash for the GTX3076r. I know you have been playing with the GT30 so what do you think about this? Also any updates on your next run of crash beams? I appreciate that you value doing things well over banging out projects and know you gave me a long lead time so no rush. I just have a couple of other projects to coordinate when that goes on and intend to meet with my paint guy soon to discuss that. Also I saw you had changed the gearing to stay in boost longer. Not sure if you've been tracking before and after, but do you expect that lap times would be reduced with your gearing change and how do you expect the change to affect the durability of the transmission as in would the gearing change equate to more or less stress on 4th and 5th lol? Last edited by IBill4You; 09-05-2015 at 07:51 PM. |
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09-05-2015, 08:39 PM | #5 |
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For ~600hp a GTX3076 is a good choice. Look at the HP rating Garret gives there turbos for a guideline on what they can do.
GTX2867, 475hp GT3076, 525hp GTX3076, 640hp Your right that GT3076 is a good idea for 350 A longer gear diff is certainly a good idea for power like this. Lap times would very by track, I would have no problem changing diffs for given tracks. Longer for a fast track, short for tight track. Final drive will have minimal effect on transmission longevity, your driving style makes a bigger impact there.
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09-05-2015, 10:07 PM | #6 |
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I need a bigger turbo for 600-650...
Yeah the 3076 is good at higher boost levels.
I'm gonna need a bigger one though because first I'm getting an e-force and then I'm going compound boost once I get a built motor, so I need something that will flow 45lbs/min at between 13-15 lbs of boost to compound it to 30 with the sc... Jaden |
09-06-2015, 01:03 AM | #7 | |
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09-12-2015, 02:29 PM | #8 |
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doesn't it also matter how you'd like your power band to sit? idk how it is on the fa20, but on the ej257 i run a gtx3582r.. keep the power further to the right so i can pull all the way to redline. i'd like the same with the fa20 rather than having it die off around 6krpm or so. ..
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09-12-2015, 02:44 PM | #9 | |
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09-12-2015, 03:04 PM | #10 |
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....borg warner 7163.....
But between these two, Id go with the 28. I like response time better than top end, more streetable to me
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09-12-2015, 06:53 PM | #11 |
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Don't forget the new GTX2971r and GTX2976r. The 2971 is a good balance between the two. The 29 exhaust housing is a clipped 30 wheel in a bored out t25 exhaust section, which should retain pretty good spool and still outflow the t28 when matched with the bigger compressor. With these new turbos it means you can go with a t28 based turbo while you're on the stock motor, then do a direct drop in gtx29 series when building the motor.
But IMO a 30 series only has a place above 400 HP. Below that there is just no reason when the gtx2867 can cook 400+. Most people we see here stop at the low to mid 400's anyway as that's where things become very expensive. |
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09-13-2015, 12:37 AM | #12 | ||
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My end game is a big turbo FA20 that can outperform a medium turbo on a track with all other variables being equal. I'm sort of putting plans in motion to live out an adolescent dream of mine to bring some passion back to my now monotonous adult life. Interestingly I was able to find a comparison video of Audis I think running very similar setups in a rolling start drag and the GT3076r walked the GT2x28 (I think running same boost) unless he was brake boosting. This leads me to believe that the bigger turbo should have potential to outperform the medium turbo even with the lag, but different car and that was straight line. Quote:
I'm sure we'll be in touch at some point in the future. |
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11-06-2015, 07:11 PM | #13 | |
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11-06-2015, 07:56 PM | #14 | |
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Most of the time I would say about 2400 rpms I see picking up boost. Kinda annoying when i'm trying to take it easy and not try to act like I want to race everyone at the stop light.
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