Originally posted by Lokiel, Sun Sep 24, 2017 5:00 pmOriginally posted by Lokiel, Tue Oct 28, 2014 11:07 pm[I was planning on posting up a summary once I had the dyno chart and some more pictures but I'll give a verbal summary now - sorry for you little kiddies, not many pictures just yet, just lots of words.
When MX5 Plus built my engine, Jason mentioned that it had noticeable boost creep.
I was paranoid about not going over 4,000rpm during the break-in period so backed off very quickly when it got close - "The Borg" spools incredibly fast so I backed off a LOT.
The turbo came with a medium Borg-Warner wastegate actuator (12-18psi) and I also bought a Forge wastegate actuator with several springs after I read that 99mx5 on MT.net switched to it after having issues with his OEM actuator. TurboSmart then released their version so I got that too with multiple springs - this was my preferred option since it matched the TurboSmart BOV I had (the BOV that comes with the turbo is dinky in comparison to the TurboSmart BOV).
Most guys using the turbo have a high-mount log manifold with the wastegate actuator between the engine and manifold, like 99mx5's (99mx5's manifold is not a log manifold though):
- note that the actuator shaft is straight.
I wanted a low-mount manifold so that I could route the intercooler hose underneath the car - the lower COG and ability to maintain an OEM look by using the OEM heatshield were added bonuses. Soviet on MT.net has this setup but has no P/S or A/C:
- note that the actuator shaft is straight and is on the passenger-side of the manifold.
The EFR turbos are designed to be easily clockable and multiple configurations should be possible.
When I had my engine built, MX5 Plus had to bend the shaft of the TurboSmart wastegate actuator to permit it to activate the wastegate valve. This isn't uncommon and if you look at the TurboSmart site you'll see that many model-specific wastegate actuators have bends in them to allow the valve to be opened and closed smoothly.
I dropped my car off at MX5 Plus to have the Super ATi damper and FM 36-2 timing wheel fitted, as well as a dyno tune. It took a few days of communication back and forth between MX5 Plus and Andy from Adaptronic to figure it out, even with FM's information which is specific to their Hydra ECU and not relevent to the Adaptronic. I thought it would be simple and based on timk's work with the Mazda Protege 36-1 timing wheel but that wasn't the case. I haven't looked into this at all but will post the details when I get a chance to look at it.
MX5 Plus also noted that the wastegate actuator was binding so the wastegae valve was never fully opening or closing and that the shaft really needed to twist as well to allow the valve to be opened and closed correctly. When the TurboSmart wastegate actuator was disassembled, the diaphragm had a pinch hole in it, either due to the bending of the shaft or the fact that the diaphragm has a flat shape and needs to move in a very linear fashion to function properly. The Forge wastegate actuator's diaphragm is more like a ball-and socket so allows for some pivoting of the shaft but that too was still binding.
We agreed to send the turbo off to MTQ to see what they could come up with since they have access to every wastegate actuator available and MX5 Plus were out of ideas and buying-and-trying different wastegate actuators would have gotten extremely expensive and time consuming. In the end, MTQ came up with a modified Ford XR6 wastegate actuator that minimised the actuator binding and allows 12psi of boost. The other option was a custom bracket for the actuator and rotating it further clockwise to allow a straighter throw of the wastegate actuator shaft but would have required cutting the shelf, something that's illegal and MX5 Plus would not do.
MX5 Plus and MTQ believe that the EFR turbos are more suited to high boost/power applications and that I will always have boost creep - at least now its minimised.
The Adaptronic ECU was confirmed as being fried by Andy so it's suspected that the Snap On jump-starter was the villain here - now decommissioned until the issue has been resolved. A "loaner" version was installed for the tune.
These issues all added to the time it took to complete the work and GT Auto, the tuners, were flat-out and also helping with Danny's WTAC car. The tuner also had an O/S trip sheduled too so MX5 Plus made sure that I got priority after the WTAC to tune the car before he left.
There's been a tonne of headaches along the way which is to be expected when using any new hardware but at least now MX5 Plus has some hands-on experience of an EFR6258 and it's good to get their professional opionion versus what some of us DIY-backyarders "reckon".
So if you're planning on an EFR6258 build in future, I'd recommend a high-mount log manifold with the wastegate actuator located between the engine and manifold. Even with this setup, I'm not convinced that you wont suffer boost creep.
Tonight I tried the new Fab9 COP Injector Control Module that Brian sent me - same result, "crank, no start" so I'm giving up on them.
They do work with the SE's OEM ECU though so if anyone wants them I'm happy to sell them for $100 (the harness is model-specific and the package includes injectors) - anyone with a Chiptorque modded ECU want them?
Originally posted by Magpie, Wed Oct 29, 2014 7:45 am[Good to hear/read that it is getting resolved. 12 months ago my engine tune was on hold due to WTAC. Note to all GT auto is very busy prior to WTAC, whilst it shows how good they are it has impacts on us normal drivers
Your build is showing his much lack of information there is for RHD cars. Just goes to show for natural aspirated cars ITB's are limited by the booster whereas for forced there are other issues. What works in LHD cars does not always work for us.
So are you going to take it to Morgan Park for a run? It is a great day and not hard on cars.
I agree that Automotive Plus is getting experience doing different things, I also hear that the exposure at WTAC is going to see them get more work, Jason will be happy!
Originally posted by ManiacLachy, Wed Oct 29, 2014 8:23 am[I always learn so much reading your threads, Simon! Even if I don't completely understand all of it, my eyes are opened to so many things I hadn't even been aware of before
So, the worst of the hurdles are out of the way now? How does she drive? Looking forward to having a bit of a gawk at the Dodgy Day!
Originally posted by Lokiel, Wed Oct 29, 2014 11:30 am[ManiacLachy wrote:I always learn so much reading your threads, Simon! Even if I don't completely understand all of it, my eyes are opened to so many things I hadn't even been aware of before
So, the worst of the hurdles are out of the way now? How does she drive? Looking forward to having a bit of a gawk at the Dodgy Day!
Most of what I know I've learned from other threads and DIYing so I try and "give back" to the community by posting my own experiences, both good and bad - I have no shame in admitting I flocked up or chose the wrong path since others can learn from my mistakes. Posting your own experiences is really useful too because occasionally someone can tell you what you need to do or should have done to rectify an issue.
Once I get the dyno chart and the wideband O2 issue sorted out, I'm going to do a build thread on MT.net - that's going to be "interesting" to say the least but I don't doubt that there will be some excellent feedback.
I still have to reserve judgement on the GT Auto tune until the new wideband O2 sensor is installed. I can say however that the rpm dip when the fans activated was markedly reduced from my DIY tune - not sure if it was due to tuning or the updated Adaptronic WARI software.
Magpie wrote::
So are you going to take it to Morgan Park for a run? It is a great day and not hard on cars.
:
Probably not, I actually want Brad Smith (Adaptronic guru) to tune the car before a track session - yes, I'm overly paranoid.
Originally posted by corners, Wed Oct 29, 2014 11:56 am[What influenced your decision to go with that turbo?
Why not a Garret? 2560 or 2871?
Originally posted by A.Chen89, Wed Oct 29, 2014 1:01 pm[Pretty keen to see the dyno graph when its done.
How bad is your boost creep? I haven't really noticed it on my one with the low mount manifold, but I've only tracked it once since the conversion.
The compressor curve for the EFR6258 is a nice fit for small motors. You end up getting the spool of a 2560 but the power of a 2871. The EFR's are super responsive.
An equivalent GTX series turbo would probably do the same job; regular 2560's and 2871's are old tech.
I've seen a Toyota AW11 with a 4AGE fitted with an EFR6258; that thing was hitting 20 psi (which is in the efficiency range of the EFR) pretty easily and making a big amount of power to boot.
Originally posted by corners, Wed Oct 29, 2014 2:17 pm[A.Chen89 wrote:Pretty keen to see the dyno graph when its done.
How bad is your boost creep? I haven't really noticed it on my one with the low mount manifold, but I've only tracked it once since the conversion.
The compressor curve for the EFR6258 is a nice fit for small motors. You end up getting the spool of a 2560 but the power of a 2871. The EFR's are super responsive.
An equivalent GTX series turbo would probably do the same job; regular 2560's and 2871's are old tech.
I've seen a Toyota AW11 with a 4AGE fitted with an EFR6258; that thing was hitting 20 psi (which is in the efficiency range of the EFR) pretty easily and making a big amount of power to boot.
Good to know, thanks for explaining
Originally posted by Lokiel, Wed Oct 29, 2014 2:31 pm[corners wrote:What influenced your decision to go with that turbo?
Why not a Garret? 2560 or 2871?
The new Borg-Warner EFR turbo series are a completely new line, not simply a slow-and-steady evolution of an existing unit; they also pack a LOT of in-built features and are pretty much "the ducks nuts" as far as turbos go, you get all the benefits of a small turbo (low spool) with all the benefits of a large turbo (MOAR POWA).
ie. all the benefits of a Garrett 2550 and 2871 combined.
One of the bigs whines you hear time and time again from guys who've installed a turbo is that they either want MOAR POWA or don't like their slow spooling large turbo - the EFR6258 covers both of these cases.