Loss of power around 3600 rpm
#1
Loss of power around 3600 rpm
I have installed the JimB intercooler pipes yesterday. (btw i have ordered those pipes 3 weeks ago and received them this week in The Netherlands, so i dont have the same experiences with Jim as some other people do)
The car behaves a little strange now. Around 3600 rpm it feels like there is powerloss, like the engine holds back. At this point the turbo starts spooling. At 4000 rpm everything is fine again and the power comes in. Any idea what causes this behaviour??
Is this because of the new intercooler piping? Because the way the air is traveling is longer now??
The car behaves a little strange now. Around 3600 rpm it feels like there is powerloss, like the engine holds back. At this point the turbo starts spooling. At 4000 rpm everything is fine again and the power comes in. Any idea what causes this behaviour??
Is this because of the new intercooler piping? Because the way the air is traveling is longer now??
#2
Could be your exhaust, what you got at the back ?
Your in Holland ?
What type of fuel are you using over there ?
I'm in Ireland using the usual unleaded stuff, standard Greddy at 6psi (tighten that waste gate rod up and get more power for your kit). You could set your base timing to 7 or 8 to be safe.
Your in Holland ?
What type of fuel are you using over there ?
I'm in Ireland using the usual unleaded stuff, standard Greddy at 6psi (tighten that waste gate rod up and get more power for your kit). You could set your base timing to 7 or 8 to be safe.
#8
Originally Posted by Fergus
Could be your exhaust, what you got at the back ?
Your in Holland ? What type of fuel are you using over there?
My base timing is at 12 degrees and retard it with the bipes to 6 degrees at 3800 rpm. I have tightend the waste gate rod to 5/6 psi.
Originally Posted by olderguy
Could be that you are getting earlier spool while still in closed loop and the ECU is not allowing enough fuel to keep the mix rich enough for that extra boost until you hit open loop at ~4000 rpm.
#9
https://www.miataturbo.net/forums/showthread.php?t=2572
The first picture in the first post in this thread gives you a schematic to make an oxygen clamp. They are also available premade from FM and myself.
Basically it fools the ECU into thinking the mixture is lean and keeps it from pulling fuel as you enter boost or adds fuel if you set it lean enough.
The first picture in the first post in this thread gives you a schematic to make an oxygen clamp. They are also available premade from FM and myself.
Basically it fools the ECU into thinking the mixture is lean and keeps it from pulling fuel as you enter boost or adds fuel if you set it lean enough.
#12
Actually, I'm pretty sure their octane ratings, even though different from ours, are still better no matter what. Especially considering they don't have MTBE poisoning their pumps. Plus the Shell Supermax and BP's highest octane is well above anything we have with the possible exception of 76 96 octane which is becoming increasingly rare.
#13
Originally Posted by olderguy
Could be that you are getting earlier spool while still in closed loop and the ECU is not allowing enough fuel to keep the mix rich enough for that extra boost until you hit open loop at ~4000 rpm.
#14
Originally Posted by firedog25
Actually, I'm pretty sure their octane ratings, even though different from ours, are still better no matter what. Especially considering they don't have MTBE poisoning their pumps. Plus the Shell Supermax and BP's highest octane is well above anything we have with the possible exception of 76 96 octane which is becoming increasingly rare.
The 98 octane that Andrepascal puts in his car is actually a slightly lower octane than the 93 I put in my car.
#15
"My base timing is at 12 degrees and retard it with the bipes to 6 degrees at 3800 rpm. I have tightend the waste gate rod to 5/6 psi."
This is a problem - close bipes switch 5 & 6 to 'Open' only retard 2* and set switch 7 & 8 to 'Closed'.
Here is my Bipes map for the same set up, 6-7psi, 91 oct, Jimb pipe & Starion IC.
From 1-10 = ooooooccoo (o= open c= closed).
This is a problem - close bipes switch 5 & 6 to 'Open' only retard 2* and set switch 7 & 8 to 'Closed'.
Here is my Bipes map for the same set up, 6-7psi, 91 oct, Jimb pipe & Starion IC.
From 1-10 = ooooooccoo (o= open c= closed).
#16
Thanks, i will try these bipes settings right away
I have installed a simple air to fuel meter in the car, using the original o2 sensor. I know this isnt accurate (seems more like a disco light) but it probably can give me a hint if i have a rich or lean fuel mixture at 3600 rpm...
I keep you informed about my findings!
I have installed a simple air to fuel meter in the car, using the original o2 sensor. I know this isnt accurate (seems more like a disco light) but it probably can give me a hint if i have a rich or lean fuel mixture at 3600 rpm...
I keep you informed about my findings!
#17
I have tried the settings bartsimpson suggested for the bipes and the power loss seems almost gone now. So i probably used to aggresive settings on the bipes. I will test some more with the bipes settings the next couple of days! And maybe it is still a good thing to install the o2 clamp. Thanks for all the input!
Andre Pascal
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