Simon-S14 Posted June 30, 2011 Share Posted June 30, 2011 Hi all... i have conducted a TRUE comparison between the two turbos thanks to Sonic Performance and Garage 7. By true comparison i mean the only thing changed was the turbo. nothing else was touched. The result was suprising and disappointing both at the same time. We found that the GTX version DID spool quicker and hence started making torque and power earlier in the midrange. i now have FULL boost around the 3500 rpm mark which for a turbo like that is impressive. Its highly streetable! The downside is that for the same boost level peak power is changed by .1 of a kw! its pretty much lineball! the two turbos match each other on the graph pretty much spot on. runs were done with air temp probe and same correction mode and dyno that STatus uses for real world comparison. Heres the pics. Solid pink line is GTX, thin red line is GT. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/ Share on other sites More sharing options...
sneakey pete Posted June 30, 2011 Share Posted June 30, 2011 Question:, is running the GTX at the same boost pressure as the other turbo a true 'fair' comparison? I mean... for example if your comparing a gt2871 with a gt4088 you don't leave them at the same boost. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890458 Share on other sites More sharing options...
Lithium Posted June 30, 2011 Share Posted June 30, 2011 Interesting result, cheers for sharing... Did you do no tuning for the change? Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890459 Share on other sites More sharing options...
R31Nismoid Posted June 30, 2011 Share Posted June 30, 2011 It's interesting to see it ramp hard @ 3500rpm. And then @ 4000rpm the GTX suddenly stops making power almost as if it's hitting surge. Was that just a case of the tune? (ie back to back test, no tune adjust?) Also interesting that its more responsive when other results all seem to show the opposite thus far. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890461 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 Question:, is running the GTX at the same boost pressure as the other turbo a true 'fair' comparison? I mean... for example if your comparing a gt2871 with a gt4088 you don't leave them at the same boost. what do you want me to do? run less or more boost? i feel same boost level should give a truer comparison yes? Lithium: no tuning.. was just run up. Declan ran out of time on the dyno but the AFR's were the same as before so its still fine. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890462 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 It's interesting to see it ramp hard @ 3500rpm. And then @ 4000rpm the GTX suddenly stops making power almost as if it's hitting surge. Was that just a case of the tune? (ie back to back test, no tune adjust?) Also interesting that its more responsive when other results all seem to show the opposite thus far. yeah it probably needs a degree or two added in one part of the map to bring it back inline. this could be due to different airflow charactoristics of the two turbos. i have seen other peoples results.. but they often have changed other things in their set ups which couldn potentially cause issues. as i said mine is a back to back. use the info as you please. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890467 Share on other sites More sharing options...
Lithium Posted June 30, 2011 Share Posted June 30, 2011 If the new turbo can flow more than the old one then potentially without raising the boost and/or adjusting the tune to maximize the new found goodness then potentially not really telling of the real difference. That result suggests to me the old turbo had more on it too... Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890472 Share on other sites More sharing options...
R31Nismoid Posted June 30, 2011 Share Posted June 30, 2011 If it didnt nose over hard, it would be looking to pickup a solid ~40kw @ 4500rpm. Now that would be very interesting indeed. Good to see a 18psi comparo too where most comparo's have been on 20-24psi for the most part. Perhaps with more boost the differential between the two would be more noticeable. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890477 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 yeah still stock bottom end here guys.. dont wanna go running 25 psi just yet haha. also note run ended at 6500 rpm too Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890480 Share on other sites More sharing options...
Lithium Posted June 30, 2011 Share Posted June 30, 2011 Yep more boost if the engine was getting to such more air would potentially show where the gtx starts coming into its own Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890485 Share on other sites More sharing options...
Lithium Posted June 30, 2011 Share Posted June 30, 2011 Yeah fair enough with the stock internals thing, hours result in terms of loading no spool though. Both turbos clearly have more to give which is pretty col in its own right Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890487 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 yeah its not bad for a 0.63 rear housing hey Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890490 Share on other sites More sharing options...
Lithium Posted June 30, 2011 Share Posted June 30, 2011 Hell yeah. Makes me want to see what even a normal gt 30 will do with a .82 with e85 Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890511 Share on other sites More sharing options...
rob82 Posted June 30, 2011 Share Posted June 30, 2011 Its a good comparison in that most cars are probably only going to run around this level of boost but this result is exactly what I would expect - apart from earlier spool. If you had of reved it to 7500rpm you may have actually seen some results. I just dont know why you guys are so dissapointed - you only need to compare the compressor maps to see that there are f**k all gains unless your running around 2bar of boost with the gtx. PS what type of engine management? Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890525 Share on other sites More sharing options...
beenowened Posted June 30, 2011 Share Posted June 30, 2011 very good result. good to see a comparison at a boost level that more people are likely to b running Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890527 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 nistune R34 board. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890531 Share on other sites More sharing options...
rob82 Posted June 30, 2011 Share Posted June 30, 2011 nistune R34 board. Was the AFR the same with either turbo? Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890545 Share on other sites More sharing options...
rob82 Posted June 30, 2011 Share Posted June 30, 2011 nistune R34 board. Was the AFR the same with either turbo? Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890566 Share on other sites More sharing options...
Simon-S14 Posted June 30, 2011 Author Share Posted June 30, 2011 yeah mate spot on. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890576 Share on other sites More sharing options...
tridentt150v Posted June 30, 2011 Share Posted June 30, 2011 Been waiting for this.....the next step is to tune/map for the GTX but don't lift the boost. I reckon the ramp up will likely maintain its margin over the GT a bit better throughout the rev range . But I have a sneaking suspicion that the peak power [for 18psi] will be very similar. But the GTX would be a lively package on the street, an extra 30rwkw at 3500!!! I'm almost tempted to sell my GT and try one [but I have other plans involving a dirty 30, so this challenge is not for me]. Link to comment https://www.sau.com.au/forums/topic/369550-gtx3076r-vrs-gt3076r-a-true-comparison/#findComment-5890594 Share on other sites More sharing options...
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