DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Boost spike

Thread Tools
 
Search this Thread
 
Old 09-12-2014, 08:07 PM
  #1  
Junior Member
Thread Starter
 
whinin's Avatar
 
Join Date: Apr 2013
Location: Elgin, SC
Posts: 359
Total Cats: -4
Default Boost spike

I get on it, boost spikes to around 8psi, runs lean (almost 13.0), as the pressure drops everything normalizes to 5psi (10.5-11.0). Have to keep my foot out of it to keep from running lean.

Can I just adjust the wastegate preload to fix this?
whinin is offline  
Old 09-12-2014, 08:34 PM
  #2  
Senior Member
iTrader: (2)
 
Twodoor's Avatar
 
Join Date: Mar 2014
Location: Meridian, Mississippi
Posts: 628
Total Cats: 44
Default

Originally Posted by whinin
I get on it, boost spikes to around 8psi, runs lean (almost 13.0), as the pressure drops everything normalizes to 5psi (10.5-11.0). Have to keep my foot out of it to keep from running lean.

Can I just adjust the wastegate preload to fix this?
What turbo?

What engine?

What downpipe and exhaust size?

What fuel management?

With the lack of information, my answer is "possibly"

Keith
Twodoor is offline  
Old 09-12-2014, 08:47 PM
  #3  
Junior Member
Thread Starter
 
whinin's Avatar
 
Join Date: Apr 2013
Location: Elgin, SC
Posts: 359
Total Cats: -4
Default

td04h
1.6l
stock downpipe, stock exhaust (no cat)
bandaids
whinin is offline  
Old 09-13-2014, 10:15 AM
  #4  
Senior Member
iTrader: (2)
 
Twodoor's Avatar
 
Join Date: Mar 2014
Location: Meridian, Mississippi
Posts: 628
Total Cats: 44
Default

Originally Posted by whinin
td04h
1.6l
stock downpipe, stock exhaust (no cat)
bandaids
How can you have a stock downpipe on a turbocharged NA?

Anyway, best advice is to try reducing the pre-load on the actuator and see if it helps. It seems to control fine after it finally cracks open. Where is your boost source for the wastegate signal?

Keith
Twodoor is offline  
Old 09-13-2014, 07:28 PM
  #5  
Junior Member
Thread Starter
 
whinin's Avatar
 
Join Date: Apr 2013
Location: Elgin, SC
Posts: 359
Total Cats: -4
Default

Stock downpipe as in the one that came with the greddy kit. Sorry lol.
Source is the stock line from the turbo outlet. I had it on the intake manifold and found out that was bad, since you could be at part throttle and getting 5psi but the turbo is pushing 20psi to get that 5 in the manifold. Had that for about a week, I knew something was wrong when the turbo was louder at part throttle.

I know I need to get my source from the intake plumbing right after the intercooler. That will be in due time.

Thanks! I figured the best/easiest option to to reduce the pre-load a bit. Just wasn't 100% sure.
whinin is offline  
Old 09-14-2014, 06:15 PM
  #6  
Moderator
iTrader: (1)
 
Girz0r's Avatar
 
Join Date: Jun 2014
Location: Austin, TX
Posts: 3,033
Total Cats: 324
Default

Originally Posted by whinin
Stock downpipe as in the one that came with the greddy kit. Sorry lol.
Source is the stock line from the turbo outlet. I had it on the intake manifold and found out that was bad, since you could be at part throttle and getting 5psi but the turbo is pushing 20psi to get that 5 in the manifold. Had that for about a week, I knew something was wrong when the turbo was louder at part throttle.

I know I need to get my source from the intake plumbing right after the intercooler. That will be in due time.

Thanks! I figured the best/easiest option to to reduce the pre-load a bit. Just wasn't 100% sure.
try to source on the intake piping right before the throttle, minimize having lag and get the 'right' boost source.
Girz0r is offline  
Old 09-14-2014, 09:34 PM
  #7  
Senior Member
iTrader: (2)
 
Twodoor's Avatar
 
Join Date: Mar 2014
Location: Meridian, Mississippi
Posts: 628
Total Cats: 44
Default

Originally Posted by Girz0r
try to source on the intake piping right before the throttle, minimize having lag and get the 'right' boost source.
Right after the intercooler IS right before the throttle body... at least on my car.

Keith
Twodoor is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Full_Tilt_Boogie
Build Threads
84
04-12-2021 04:21 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
LucaCarMods
Build Threads
11
02-14-2016 06:13 AM
Trent
WTB
2
10-01-2015 12:15 PM
shooterschmidty
Engine Performance
8
09-30-2015 10:28 PM



Quick Reply: Boost spike



All times are GMT -4. The time now is 12:46 PM.