DIY Turbo Discussion greddy on a 1.8? homebrew kit?
Sponsored by:
Sponsored by:

Lazy EFR and overboost

 
Old 05-25-2018, 05:47 AM
  #1  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default Lazy EFR and overboost

Got my car to a dyno today for it's first initial tune. We're a bit stumped on how late the boost is building. Another issue we're having is controlling the boost pressure. We aimed to run 10psi, using a Turbosmart Actuator and 10psi spring combo, but little f#cker of a turbo just want's to keep boosting once it's on.

Why do I want to limit boost, we'll my built motor is still in boxes in the garage, till then low boost.

Kraken manifold, EFR6258 .64a/r, 3" straight pipe, engine stock.

Up top we had to limit the timing, the high boost was causing valve float.

We also wired the wastegate open, boost still crept up to 4psi, which is kinda interesting too.
Attached Thumbnails Lazy EFR and overboost-img_20180525_161300.jpg   Lazy EFR and overboost-img_20180525_161330.jpg  
BarendB is offline  
Old 05-25-2018, 07:37 AM
  #2  
Moderator
iTrader: (12)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 18,879
Total Cats: 2,355
Default

Common causes:

Lazy= boost leak, wastegate not closed completely, boost leak, wastegate not closed completely, cam timing off, spark timing off, displacement deficiency, wastegate signal source wrong, boost leak, wastegate not closed.

Overboost= small a/r, small wastegate opening, wastegate not opening fully, boost controls interfering, other things (needs coffee).
sixshooter is offline  
Old 05-25-2018, 08:57 PM
  #3  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default

Cheers man, looked into the wategate opening.

Here's what I've got so far, stroke length is 20mm (0.78") which I think is correct according to the EFR Technical docs. Without removing the turbo I can't confirm it's opening fully. That will be a later resort.

Moving on to check the other suggestions.
Attached Thumbnails Lazy EFR and overboost-img_20180526_124715.jpg   Lazy EFR and overboost-img_20180526_124730.jpg  
BarendB is offline  
Old 05-26-2018, 03:07 AM
  #4  
VladiTuned
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 35,141
Total Cats: 3,144
Default

Likely it's binding. I had the same issue tuning EO2K's car. gotta re-align the actuator rod properly
18psi is offline  
Old 05-27-2018, 04:08 AM
  #5  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default

We didn't hookup EBS yet, so that might explain the laziness ???

Checked for binding, it moves really freely, we did built a custom bracket for the actuator, but it moves very easily. One thing I did noticed is.
Stock actuator throw ~20mm (0.78") total wastegate arm movement ~28 (1.1")
Turbosmart actuator throw ~15mm (0.59") total wastegate arm movement ~20mm (0.78")

So the stock actuator opens the gate way way further, so that might explain the overboost, the picture shows how far the stock actuator moved the gate, you can lightly make out my pen marks from the Turbosmart actuator

That's really concerning, anyone else using one of these actuators?
Attached Thumbnails Lazy EFR and overboost-img_20180526_135838.jpg  
BarendB is offline  
Old 06-01-2018, 12:42 PM
  #6  
Junior Member
 
Join Date: Sep 2015
Location: Memphis, TN
Posts: 194
Total Cats: 30
Default

Which actuator is it?

I'm running a 7psi spring in a dual-port TurboSmart IWG75 on my 6758 0.85 A/R vBand setup, with a Gleaseman / Fab9 manifold and 3" downpipe and back. Obviously we aren't running equal things here, but I digress... If I leave my EBC disabled, boost onset is markedly slower but the turbo still caps out at 7psi quite reliably, actually tapering down just slightly beyond ~6750 into redline. With the EBC enabled and dialed in, it will load up 4th gear enough on a simple dynojet 248c roller to hit 15psi by 3650 and hold it flat to redilne; spool is easily 300RPM sooner on an actual road.
albuquerquefx is offline  
Old 06-01-2018, 04:52 PM
  #7  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default

@albuquerquefx It's the Turbosmart IWG75 Single port actuator
BarendB is offline  
Old 06-03-2018, 02:07 AM
  #8  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default

I made a video showing the difference in how far the difference actuator opens the wastegate

BarendB is offline  
Old 06-08-2018, 11:24 AM
  #9  
Junior Member
 
Join Date: Sep 2015
Location: Memphis, TN
Posts: 194
Total Cats: 30
Default

The lack of opening angle certainly explains the overboost / creep, but doesn't explain "lazy." My first whack at fixing the opening angle, would be backing out the preload. I see you have some thread left, I'd see if backing it out to nearly the full extent fixes much. IIRC, my dual-port IWG75 wanted 3mm of preload, no less and no more, but it absolutely opens as much as the stock canister. If you disconnect both the stocker and the IWG, and hold them in free air, do both have the same actuator rod travel from unpressurized to fully pressurized? If so, then I'm suspect of your custom-made mounting flange. If not, I wonder if somehow you got a bad part...

On the "lazy" side of things, does the WG close fully / tightly when there is no pressure applied to the actuator can?
albuquerquefx is offline  
Old 06-08-2018, 11:16 PM
  #10  
Newb
Thread Starter
 
Join Date: Sep 2017
Location: New Zealand
Posts: 21
Total Cats: -2
Default

Stock Canister and Turbosmart one doesn't extend to equal lengths. Took them off and tested it side by side... I also tried with the stock mounting bracket didn't make any difference :(

This might sound extreme, but we're actually thinking of putting an external gate on it now
BarendB is offline  
Old 06-09-2018, 07:09 AM
  #11  
Moderator
iTrader: (12)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 18,879
Total Cats: 2,355
Default

Use a stock one.
sixshooter is offline  
Old 06-11-2018, 03:33 PM
  #12  
Junior Member
 
Join Date: Sep 2015
Location: Memphis, TN
Posts: 194
Total Cats: 30
Default

Originally Posted by sixshooter View Post
Use a stock one.
Yeah, this is where my head would start. First and foremost, it sounds like your IWG75 is somehow wrong or broken. If it cannot fully actuate the gate, then ****'s broke.

Second, why buy the IWG75 and only use a single port? The ONLY reason I replaced the BW can was to get that sweet sweet dual-port action (fapfapfap.)
albuquerquefx is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
GrahamC
Prefabbed Turbo Kits
66
10-23-2017 02:08 PM
MX-5Garry
DIY Turbo Discussion
17
10-26-2016 01:36 PM
FAB
Fab9 Tuning - Miata Performance Parts
0
07-08-2015 04:35 PM
miatamike203
DIY Turbo Discussion
7
03-11-2012 08:59 AM
Latch
Prefabbed Turbo Kits
0
02-21-2008 01:39 PM


Thread Tools
Search this Thread
Quick Reply: Lazy EFR and overboost


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.