New BW EFR Turbo Thread
Dec 23, 2011 | 10:17 PM
#1262
Newbie
Joined: Jun 2008
Posts: 71
Likes: 0
From: Johannesburg, South Africa
Have all the comparative HP/TQ curves been taken in the same gear..?
To me, this is where I see a discrepancy...
The 7670 HP/TQ plots just seem too early for me to, like it was recorded in a much higher gear...say 5th...while all the others turbos were done in say 3rd gear!
*Edit*
And I'm aware the dyno sheets say 3rd gear...
To me, this is where I see a discrepancy...
The 7670 HP/TQ plots just seem too early for me to, like it was recorded in a much higher gear...say 5th...while all the others turbos were done in say 3rd gear!
*Edit*
And I'm aware the dyno sheets say 3rd gear...
Last edited by Phoenix*; Dec 24, 2011 at 03:27 AM.
Dec 24, 2011 | 04:38 AM
#1263
The point of eddy current dyno comparison is that, if with the previous turbo I have used a an amount X of eddy current load, and now I have a turbo that makes a lot more torque and power, so I must use an amount of load of X+20% to have the same ramp rate, the spool curve can't be compared.
However this is an absolute GREAT result
However this is an absolute GREAT result
Last edited by eTiLiKo; Dec 24, 2011 at 04:43 AM.
Dec 24, 2011 | 05:14 AM
#1264
Evolving Member
Joined: Dec 2003
Posts: 305
Likes: 0
From: England
Have all the comparative HP/TQ curves been taken in the same gear..?
To me, this is where I see a discrepancy...
The 7670 HP/TQ plots just seem too early for me to, like it was recorded in a much higher gear...say 5th...while all the others turbos were done in say 3rd gear!
*Edit*
And I'm aware the dyno sheets say 3rd gear...
To me, this is where I see a discrepancy...
The 7670 HP/TQ plots just seem too early for me to, like it was recorded in a much higher gear...say 5th...while all the others turbos were done in say 3rd gear!
*Edit*
And I'm aware the dyno sheets say 3rd gear...
Test was done by selecting 3000rpm as the starting point then loading up the engine and waiting 3 seconds to start the run,
The EFR just wants to make boost its awesome and I just cant see how to fake a boost log and the dd dyno is run in shoot out mode.
Mark
Dec 24, 2011 | 05:39 AM
#1265
Newbie
Joined: Jun 2008
Posts: 71
Likes: 0
From: Johannesburg, South Africa
Same gear is used in all tests and its 3rd gear,
Test was done by selecting 3000rpm as the starting point then loading up the engine and waiting 3 seconds to start the run,
The EFR just wants to make boost its awesome and I just cant see how to fake a boost log and the dd dyno is run in shoot out mode.
Mark
Test was done by selecting 3000rpm as the starting point then loading up the engine and waiting 3 seconds to start the run,
The EFR just wants to make boost its awesome and I just cant see how to fake a boost log and the dd dyno is run in shoot out mode.
Mark
Looking at your whp dyno plot...it shows 2.5bar boost pre-3500rpm!!!
Relative pressure..? Damn!!!
That's no lag Mark!
Dec 24, 2011 | 06:14 AM
#1266
Evolving Member
Joined: Dec 2003
Posts: 305
Likes: 0
From: England
This is how I would expect most to start a power run and theres no point starting it at anything less than full throttle its only the starting point to be diff,
The EFR is awesome on that set up.
Mark
Dec 24, 2011 | 08:26 AM
#1267
Newbie
Joined: Jun 2008
Posts: 71
Likes: 0
From: Johannesburg, South Africa
We lock the dyno to hold 3k and then apply full throttle holding it there for 3 seconds and then let it run the power run,
This is how I would expect most to start a power run and theres no point starting it at anything less than full throttle its only the starting point to be diff,
The EFR is awesome on that set up.
Mark
This is how I would expect most to start a power run and theres no point starting it at anything less than full throttle its only the starting point to be diff,
The EFR is awesome on that set up.
Mark
But, I don't see the point in locking the motor to one speed and building so much boost...
Doing this for testing purposes is one thing, but it doesn't really simulate how the turbo will perform/behave on the track or street!
Yes, it obviously has the potential to spool quick and likes boost, but were all the other comparative turbos listed on your dyno sheet also tested in the same manner..?
Dec 24, 2011 | 09:21 AM
#1268
Evolving Member
Joined: Dec 2003
Posts: 305
Likes: 0
From: England
I hear you about loading the motor with the dyno...
But, I don't see the point in locking the motor to one speed and building so much boost...
Doing this for testing purposes is one thing, but it doesn't really simulate how the turbo will perform/behave on the track or street!
Yes, it obviously has the potential to spool quick and likes boost, but were all the other comparative turbos listed on your dyno sheet also tested in the same manner..?
But, I don't see the point in locking the motor to one speed and building so much boost...
Doing this for testing purposes is one thing, but it doesn't really simulate how the turbo will perform/behave on the track or street!
Yes, it obviously has the potential to spool quick and likes boost, but were all the other comparative turbos listed on your dyno sheet also tested in the same manner..?
Its my standard method of testing so yes they are all the same,
On the track you are never at 3k so that doesnt inc in the RR test and on the street you are cruising and then press the accel pedal is the same.
Mark
Dec 24, 2011 | 06:08 PM
#1269
Evolving Member
Joined: Feb 2007
Posts: 491
Likes: 1
From: Redmond Washington
The difference between the 3 curves at anything less than 5000 rpm is ridiculous. I have to say that when I looked at the curves, I thought for sure that the EFR was run as you say, but the other 2 were run up from a light throttle cruise. This because the other 2 are shown making less than 180 whp at 4000 rpm, which I figure those turbos are capable of without the 3 second WOT preload. Have to wonder what the 3 curves would look like if each run was started from a 3000 rpm light-throttle cruise condition (like street driving). Great results though - thanks for posting!
Dec 25, 2011 | 02:41 AM
#1272
Evolving Member
Joined: Dec 2003
Posts: 305
Likes: 0
From: England
The difference between the 3 curves at anything less than 5000 rpm is ridiculous. I have to say that when I looked at the curves, I thought for sure that the EFR was run as you say, but the other 2 were run up from a light throttle cruise. This because the other 2 are shown making less than 180 whp at 4000 rpm, which I figure those turbos are capable of without the 3 second WOT preload. Have to wonder what the 3 curves would look like if each run was started from a 3000 rpm light-throttle cruise condition (like street driving). Great results though - thanks for posting!
They were all run in the same way 100%, The GT30 was about a year ago and the S200 was about 6 months.
Mark
Dec 25, 2011 | 06:07 AM
#1273
That is NOT the correct way to run a DD. You are in effect building boost PRIOR to throwing the switch for the power run to commence (ramp up) hence the amazing amount of boost at the start of the "logged" run.
The correct way to start a power run (shoot44) on DD (Dyno Dynamics) is to run the car upto 2000rpm, flick the switch to start the ramp rate and power run and then floor it then the the boost from start to finish would be logged i.e it might actually show some spool up.
Last edited by Conrad; Dec 25, 2011 at 06:10 AM.
Dec 25, 2011 | 11:24 AM
#1274
We lock the dyno to hold 3k and then apply full throttle holding it there for 3 seconds and then let it run the power run,
This is how I would expect most to start a power run and theres no point starting it at anything less than full throttle its only the starting point to be diff,
The EFR is awesome on that set up.
Mark
This is how I would expect most to start a power run and theres no point starting it at anything less than full throttle its only the starting point to be diff,
The EFR is awesome on that set up.
Mark
The run can and should be started as soon as 100% throttle is applied.
Dec 26, 2011 | 01:03 AM
#1275
Newbie
Joined: Jun 2008
Posts: 71
Likes: 0
From: Johannesburg, South Africa
The other 2 turbos are only showing 1.3bar between 4000-4250rpm...or there abouts!
By you saying all turbos were tested in the same manner @ 3000rpm, you are basically implying that the GT30 and S200 built-up virtually zero boost under load...