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    Thread: check out this compressor map and tell me what you think

    1. Senior Member Vegeta Gti's Avatar
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      09-14-2020 08:20 PM #1151
      Quote Originally Posted by NasMK4_2 View Post
      Good to see vegeta and mainsyc still active in the forums after all these years wow.

      Still love this thread, its unfortunate i cant get back into my old account... but wow these new 550's look like a very promising turbo!


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      Quote Originally Posted by .Ant View Post
      What vegeta said.

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    3. Semi-n00b
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      09-16-2020 06:19 AM #1152
      Quote Originally Posted by mainstayinc View Post
      Those two turbos are pretty closely matched but the G25-550 looks slightly better on paper. It also depends on the turbine A/R. Below I overlaid both turbos with 2.0L displacement. G-series is in [BLUE] and the GTX in [RED].

      Thanks, yes I saw comparison, I am curious how much spool is different with AR 0.57 vs 0.71...
      Last edited by Nenad22; 09-16-2020 at 06:31 AM.

    4. Member
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      09-16-2020 10:13 AM #1153
      Quote Originally Posted by Nenad22 View Post
      Thanks, yes I saw comparison, I am curious how much spool is different with AR 0.57 vs 0.71...
      You can probably get the GTX2867R2 to spool as fast as the G25-550 with the smaller 0.57 A/R turbine housing. However, the G25-550 will be more efficient with the larger 0.71 A/R housing through out the power band.
      The Bible Teaches That Few are Saved. Why Hell Must Be Eternal. Scientific Evidence for God. "The perverse are hard to be corrected, and the number of fools is infinite." (Ecclesiastes 1:15).

    5. Semi-n00b
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      09-16-2020 10:20 AM #1154
      Thanks, from some tuners, I got information that 0.57 GTX2867R gen2 is faster spooling turbo than g25 and can do up to 450HP with that AR. But compressor maps show that g25 is better even with 0.72.

    6. Member
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      09-16-2020 11:25 AM #1155
      Quote Originally Posted by Nenad22 View Post
      Thanks, from some tuners, I got information that 0.57 GTX2867R gen2 is faster spooling turbo than g25 and can do up to 450HP with that AR. But compressor maps show that g25 is better even with 0.72.
      That's very interesting. Thanks for the feedback.
      The Bible Teaches That Few are Saved. Why Hell Must Be Eternal. Scientific Evidence for God. "The perverse are hard to be corrected, and the number of fools is infinite." (Ecclesiastes 1:15).

    7. Senior Member Vegeta Gti's Avatar
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      09-16-2020 01:23 PM #1156
      I want to see a few of these .57ar cars in action

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      Quote Originally Posted by .Ant View Post
      What vegeta said.

    8. 09-17-2020 06:57 AM #1157
      Hi there

      I'm landing all the time on this forum with questions about turbo choices, so first: thanks for that!
      Also I have seen some compares between the G25-550, G25-660 and EFR7163 so far so good

      My question is, how big is the affect of the turbine wheel efficiency?
      The G25-550 has a efficiency of 80% and the EFR7163 of 74%
      I have here a map of a g25-550 and of the EFR7163 with both on the island of 72%
      Both have arround 47/48lb/min with an absolute pressure of 2.7bar
      What will here be the difference between those two turbos?

      Thanks and sorry for my english

      <a href="https://ibb.co/tYMHn6W"><img src="https://i.ibb.co/ygnNKCb/Map-G25-550.png" alt="Map-G25-550" border="0"></a>
      <a href="https://ibb.co/ZTqhqvv"><img src="https://i.ibb.co/pXY3YNN/Map-7163.png" alt="Map-7163" border="0"></a>

    9. Semi-n00b
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      Today 03:59 AM #1158
      Quote Originally Posted by Unluck21 View Post
      Hi there

      I'm landing all the time on this forum with questions about turbo choices, so first: thanks for that!
      Also I have seen some compares between the G25-550, G25-660 and EFR7163 so far so good

      My question is, how big is the affect of the turbine wheel efficiency?
      The G25-550 has a efficiency of 80% and the EFR7163 of 74%
      I have here a map of a g25-550 and of the EFR7163 with both on the island of 72%
      Both have arround 47/48lb/min with an absolute pressure of 2.7bar
      What will here be the difference between those two turbos?

      Thanks and sorry for my english <img src="https://www.vwvortex.com/Anthony/Smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />


      Turbine efficiency is important for mass flow at high RPM. Depending on your application neither of these turbos will be great at that flow rate and high RPM. The EFR is around 64% efficient there? It's close to choke. Same with the G25, it's around 68% at that same flow rate. You might need the larger housing A/R to reach the power level you are looking for to ensure you don't cause high backpressure and volumetric efficiency loss.

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