New BW EFR Turbo Thread
Evolving Member
Joined: Aug 2009
Posts: 143
Likes: 1
From: SF Bay Area
But do you have the same data on equivalently sized, twinscroll GTX and PTEs?
Also, how exactly was that recorded?
180kPa in 6ms means the turbo was already spinning fast enough to produce that boost. If anything, it was probably making that boost in the upper intercooler pipe and you are likely seeing the response time of the sensor and not the turbo. Scott from FP made some logs showing a similar situation where the MAP sensor sees vacuum under part throttle but the upper IC pipe had a ton of boost pressure and it lead to part throttle surge.
I'm not questioning if the response is great. I question if the data you have is really a fair projection of response. You said it yourself, unless you did a coast down from a higher RPM (like 7000RPM) to let the turbo speed minimize before the test, it really doesn't tell you much about true transient response.
Also, how exactly was that recorded?
180kPa in 6ms means the turbo was already spinning fast enough to produce that boost. If anything, it was probably making that boost in the upper intercooler pipe and you are likely seeing the response time of the sensor and not the turbo. Scott from FP made some logs showing a similar situation where the MAP sensor sees vacuum under part throttle but the upper IC pipe had a ton of boost pressure and it lead to part throttle surge.
I'm not questioning if the response is great. I question if the data you have is really a fair projection of response. You said it yourself, unless you did a coast down from a higher RPM (like 7000RPM) to let the turbo speed minimize before the test, it really doesn't tell you much about true transient response.
OTOH I'm not questioning the results, we just need data from an ordinary turbo for comparison.
my logger is at 50Hz.
I've taken data from the time from when the TPS is 100% until the kpa reaches these amounts. This is from vacuum, between shifts, etc. That's why I said it was an average from all my data. I keep record of time since last WOT, was it a 1,2,3 pull, or just a 3rd gear pull etc.
I have not done the T90 testing that I prefer to do. So I'm guilty of that.
I would like to test a HTA or GTX 3076 with a 1.0x A/R DividedT4 housing.... which means I'll need to buy one. I don't believe PTE sells anything that is competitive in that size, but if they do I'll be happy to buy it and test it this winter.
FP removed their T4 Divided housings from the 3076 options.
I've taken data from the time from when the TPS is 100% until the kpa reaches these amounts. This is from vacuum, between shifts, etc. That's why I said it was an average from all my data. I keep record of time since last WOT, was it a 1,2,3 pull, or just a 3rd gear pull etc.
I have not done the T90 testing that I prefer to do. So I'm guilty of that.
I would like to test a HTA or GTX 3076 with a 1.0x A/R DividedT4 housing.... which means I'll need to buy one. I don't believe PTE sells anything that is competitive in that size, but if they do I'll be happy to buy it and test it this winter.
FP removed their T4 Divided housings from the 3076 options.
Last edited by R/TErnie; Nov 4, 2012 at 10:08 AM.
Evolving Member
Joined: Aug 2009
Posts: 143
Likes: 1
From: SF Bay Area
Wouldn't the GTX3071 be a better match for the EFR 7163? They both have 71mm comp wheels and the GTX is rated at approx 56 lb.min. Precision has the new CEA turbine wheel in their billet 5558 which is rated at 590 HP.
There's very few options for a small turbo paired with a divided T4 flange. The EFR is unique in that regard.
There's very few options for a small turbo paired with a divided T4 flange. The EFR is unique in that regard.
Wouldn't the GTX3071 be a better match for the EFR 7163? They both have 71mm comp wheels and the GTX is rated at approx 56 lb.min. Precision has the new CEA turbine wheel in their billet 5558 which is rated at 590 HP.
There's very few options for a small turbo paired with a divided T4 flange. The EFR is unique in that regard.
There's very few options for a small turbo paired with a divided T4 flange. The EFR is unique in that regard.
I have SEEN a T4 1.0X A/R Divided housing on a GTX3076... I would guess that I could use that same turbine housing on the HTA3076 as well. The precision unit would need to sourced, but I could use the same turbine for both of those other turbos.
Newbie
Joined: Jun 2010
Posts: 10
Likes: 0
From: Australia
7064 T4 1.05 on stock evo 5 motor(tired) with HKS 274/278 cams, ID1000's and Vipec ECU. Running on E-Flex fuel ( not the best but can buy it at the pump over here http://www.caltex.com.au/ProductsAndServices/Pages/BioFuels.aspx )Power is at the wheels.
Evolved Member
Joined: Mar 2010
Posts: 715
Likes: 17
From: Welly NZ
Nice - Are the two runs the same turbo on different boost levels, or 98 vs eflex? How does it drive? What maxed out to stop you at 301awkw -fuel flow/turbo flow/bravado?
For the non-Dyno Dynamics initiated those numbers would probably equate to around 430-440whp on a Dynojet.
For the non-Dyno Dynamics initiated those numbers would probably equate to around 430-440whp on a Dynojet.
Newbie
Joined: Jun 2010
Posts: 10
Likes: 0
From: Australia
The 2 different runs are boost, the 264 is 17psi and 301 is 21psi.
the stock 5 bottom end is not the strongest and mine has hard a hard life, I am building a motor atm for it, also at 21psi it was at 103% duty cycle on the injectors, im only running one Aeromotive 340 in tank atm so fueling is limited. When the new motor goes in I will go to twin 044's, ID2000's and 30psi and it should go 350kw, maybe more.
Drives really well, the graph makes it seem laggy but it is definitely not, pulls really well all the way through the rev range and just wants to keep going. Am super keen to get my new motor done and see how it goes on that. Fingers crossed it can hold boost to 9500rpm, I'm not sure the 7064 will hang on up top so may have to go to the 7670, but we'll see.
the stock 5 bottom end is not the strongest and mine has hard a hard life, I am building a motor atm for it, also at 21psi it was at 103% duty cycle on the injectors, im only running one Aeromotive 340 in tank atm so fueling is limited. When the new motor goes in I will go to twin 044's, ID2000's and 30psi and it should go 350kw, maybe more.
Drives really well, the graph makes it seem laggy but it is definitely not, pulls really well all the way through the rev range and just wants to keep going. Am super keen to get my new motor done and see how it goes on that. Fingers crossed it can hold boost to 9500rpm, I'm not sure the 7064 will hang on up top so may have to go to the 7670, but we'll see.
Newbie
Joined: Sep 2012
Posts: 1
Likes: 0
From: Billings, MT
agreed. I would think the 8374 would be easier to find PTE, HTA, and GTX equivalents for testing... however I have the 7670 and I'd like to do a bunch of comparisons against it while i still have this turbo.
I have SEEN a T4 1.0X A/R Divided housing on a GTX3076... I would guess that I could use that same turbine housing on the HTA3076 as well. The precision unit would need to sourced, but I could use the same turbine for both of those other turbos.
I have SEEN a T4 1.0X A/R Divided housing on a GTX3076... I would guess that I could use that same turbine housing on the HTA3076 as well. The precision unit would need to sourced, but I could use the same turbine for both of those other turbos.
1.06 a/r T4 TS still available
http://www.atpturbo.com/mm5/merchant...egory_Code=GTH
http://www.atpturbo.com/mm5/merchant...egory_Code=GTH
crap... I missed the tiny print that says...check this box if you want for a 3076 LOL.
$1830 out the door. I'll grab some more gaskets and fittings when I order it. Thanks!
$1830 out the door. I'll grab some more gaskets and fittings when I order it. Thanks!
Last edited by R/TErnie; Nov 5, 2012 at 09:16 AM.
The 2 different runs are boost, the 264 is 17psi and 301 is 21psi.
the stock 5 bottom end is not the strongest and mine has hard a hard life, I am building a motor atm for it, also at 21psi it was at 103% duty cycle on the injectors, im only running one Aeromotive 340 in tank atm so fueling is limited. When the new motor goes in I will go to twin 044's, ID2000's and 30psi and it should go 350kw, maybe more.
Drives really well, the graph makes it seem laggy but it is definitely not, pulls really well all the way through the rev range and just wants to keep going. Am super keen to get my new motor done and see how it goes on that. Fingers crossed it can hold boost to 9500rpm, I'm not sure the 7064 will hang on up top so may have to go to the 7670, but we'll see.
the stock 5 bottom end is not the strongest and mine has hard a hard life, I am building a motor atm for it, also at 21psi it was at 103% duty cycle on the injectors, im only running one Aeromotive 340 in tank atm so fueling is limited. When the new motor goes in I will go to twin 044's, ID2000's and 30psi and it should go 350kw, maybe more.
Drives really well, the graph makes it seem laggy but it is definitely not, pulls really well all the way through the rev range and just wants to keep going. Am super keen to get my new motor done and see how it goes on that. Fingers crossed it can hold boost to 9500rpm, I'm not sure the 7064 will hang on up top so may have to go to the 7670, but we'll see.