Slow spool?
2 Attachment(s)
This is my first turbo car so I'm still getting accustomed to the whole spool concept. I'm just getting my car tuned and running right, but from what I've read it doesn't seem to be spooling as low as it should. I took a datalog and graphed it, does it look right? If it is spooling slower than it should any idea what could be causing it? This is a 4th gear pull and not significantly different than any other gear. X axis is RPMs, Y Axis is PSI.
Attachment 208799 Excel file is also attached if you want to look at the individual values. Specs on the car are: '95 1.8 motor BEGI S3 turbo kit GT2560 turbo Megasquirt PNP ecu Cheap Ebay MBC Currently running an 18" long 2.5" straitpipe off the downpipe Any other questions let me know and I'll do my best to answer. |
spool is WAYY late....is the wga tight?
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wastegate is too loose
boost leak |
When I first installed the kit I was hitting boost cut really bad, even up to 12psi. I had to adjust the wastegate actuator all the way out in order for it to keep boost right at 10psi. The wastegate lever thing (god I suck at this) is perpendicular to the motor when it's closed, which I'm assuming is correct.
I'll go double check for a boost leak. Any other recommendations? |
tighten the wga....thats whats causing it
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edit: nevermind, i wont advise it for a first turbo car.
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Originally Posted by pdexta
(Post 359382)
When I first installed the kit I was hitting boost cut really bad, even up to 12psi. I had to adjust the wastegate actuator all the way out in order for it to keep boost right at 10psi. The wastegate lever thing (god I suck at this) is perpendicular to the motor when it's closed, which I'm assuming is correct.
I'll go double check for a boost leak. Any other recommendations? Terms: Wastegate can is the big round thing that fills with boost Wastegate actuator rod is the thing that pokes out of the can Wastegate lever arm is the thing that's on the turbo The actuator rod should be lightly pulling the lever arm closed when you're off boost. To check this, pull the rod off the lever arm. You should have to tension the rod very slightly to get it to snap over the lever arm. If you pull it off, and you can close the lever arm more, you've got a problem. If you do that, and you get boost overshoot, you need to port the wastegate. |
Originally Posted by 18psi
(Post 359383)
tighten the wga....thats whats causing it
12psi@3500rpms > 4psi@3500rpms Thanks for the help guys. I'd never figure this stuff out on my own. :bowdown: |
Thats awesome.. Hell of alot better now huh!!! :)
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for comparison, post a datalog of a 4th gear pull now.
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did you try running without the MBC at all?
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Turbos definitely spool better when the wastegate is shut.
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Originally Posted by ThePass
(Post 359478)
for comparison, post a datalog of a 4th gear pull now.
Originally Posted by akaryrye
(Post 359484)
did you try running without the MBC at all?
Originally Posted by patsmx5
(Post 359486)
Turbos definitely spool better when the wastegate is shut.
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ya that boost controller is designed to raise the boost, so if you ever get in that situation again, first thing to do is to take it off.
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Originally Posted by akaryrye
(Post 359590)
ya that boost controller is designed to raise the boost, so if you ever get in that situation again, first thing to do is to take it off.
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Alright, I'm back again w/ more stupid questions....
The night I tightened the wastegate the car was awesome for a few minutes, then I the adjuster on my boost controller apparently came loose and blew the end off and the the spring went flying. I've been through a couple other boost controllers now but everytime I'm back to the same old problem of building boost very slowly. The wastegate is tightened down now and I've checked thoroughly for boost leaks. I haven't tested for leaks yet but I'm 99.9% sure it isn't leaking anywhere. I checked my wastegate actuator and it does not hold suction (I can suck on the vacuum hose to it and it doesn't seal). Is it supposed to do that, or could that be my problem? 1 step forward and 2 steps back I guess. Again, any help is greatly appreciated. |
Originally Posted by patsmx5
(Post 359486)
Turbos definitely spool better when the wastegate is shut.
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Originally Posted by pdexta
(Post 364415)
Alright, I'm back again w/ more stupid questions....
The night I tightened the wastegate the car was awesome for a few minutes, then I the adjuster on my boost controller apparently came loose and blew the end off and the the spring went flying. I've been through a couple other boost controllers now but everytime I'm back to the same old problem of building boost very slowly. The wastegate is tightened down now and I've checked thoroughly for boost leaks. I haven't tested for leaks yet but I'm 99.9% sure it isn't leaking anywhere. I checked my wastegate actuator and it does not hold suction (I can suck on the vacuum hose to it and it doesn't seal). Is it supposed to do that, or could that be my problem? 1 step forward and 2 steps back I guess. Again, any help is greatly appreciated. |
Originally Posted by NA6C-Guy
(Post 364451)
Thats just a myth from the land of China. They flow better with the wastegate open.
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Originally Posted by ZX-Tex
(Post 364679)
What did you connect the wastegate actuator vacuum line to in the intake system? Is it before or after the throttle?
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