Hi guys I have a track car (CC GSR) converted to a 4G63T from a Galant VR4, it wouldn't idle properly so after some research I removed the FIAV & the ISC and fitted a block off plate, but now it still idles high around 1500 rpm although it's not that big a deal on a race car I know it's not right and it bothers me.
Any ideas?
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#1
Posted 12 February 2012 - 12:53 PM
Oldschooler
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"Can you tell me just exactly what freedom means, when i'm not free to be as twisted as i wanna be"
RIDES:
'71 HG Holden V8 - Daily/Weekend Driver
'93 GSR AWD Lancer Mitsubishi 4G63t - Racecar
RIDES:
'71 HG Holden V8 - Daily/Weekend Driver
'93 GSR AWD Lancer Mitsubishi 4G63t - Racecar
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#2
Posted 12 February 2012 - 01:55 PM
jack be nimble
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Is the throttle shut completely, have you done a boost leak test, this will show any vacuum leaks. Is tps correct and if you have idle switch is it switching correctly.
Without a isc, you can adjust biss, does this lower the idle?
Without a isc, you can adjust biss, does this lower the idle?
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.
#3
Posted 12 February 2012 - 03:21 PM
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Is the throttle shut completely, have you done a boost leak test, this will show any vacuum leaks. Is tps correct and if you have idle switch is it switching correctly.
Without a isc, you can adjust biss, does this lower the idle?
First I should say I'm new at this turbo crap, as my name suggests I'm use to carbys and dizzys LOL, but I' learning a lot lately.
Now for your questions.
1) Yes the throttle is completely shut.
2) No haven't done a boost leak test (wouldn't have a clue how
), side note when idling the vacuum/boost gauge is at 20 vac (IN-Hg)3) I'm fairly sure the TPS is correct, I've tested it with my ohm meter and set it to 0.7 at throttle closed.
4) Idle switch isn't connected.
5) Yes adjusting the BISS makes a difference, but if I set the idle at anywhere between 800 - 1500 rpm it stalls after revving it up letting the foot off.
Thanks for your response hope these answers clear thing up.
"Can you tell me just exactly what freedom means, when i'm not free to be as twisted as i wanna be"
RIDES:
'71 HG Holden V8 - Daily/Weekend Driver
'93 GSR AWD Lancer Mitsubishi 4G63t - Racecar
RIDES:
'71 HG Holden V8 - Daily/Weekend Driver
'93 GSR AWD Lancer Mitsubishi 4G63t - Racecar
#4
Posted 13 February 2012 - 01:27 AM
jack be nimble
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I don't have much experience with race cars, but I would run a isc, and probably a fiav as well.
The isc basically mirrors throttle position but controls idle as well.
There is a sticky about it in the evo1-3 section or the mitsi madness part.
I can't see how to control idle without a isc.
Boost testers are available from eBay and is the next tool on my list.
The isc basically mirrors throttle position but controls idle as well.
There is a sticky about it in the evo1-3 section or the mitsi madness part.
I can't see how to control idle without a isc.
Boost testers are available from eBay and is the next tool on my list.
4g93t jumbuck conversion. PRANGED 18/3/12, CHECK MY MEMBER RIDES Page 11. no serious human injuries.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.
ON THE ENGINE STAND. g4cs 2.4l + Gt35r. PLUS: auto conversion + Awd coming.
thanks for parts and help: BMGTZ, EVOCPE, cwolf, Benozi, Jamo-GSR, 1JUM2NV, RXVII..much appreciated, cheers guys.
Aerodynamics are for people who can't build engines. —Enzo Ferrari
REMEMBER: you cant polish a turd, but you can roll it in glitter.
#5
Posted 14 February 2012 - 12:50 PM
alltime01
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I'm sure you guys have seen this before, i made one, costs basically nothing......
http://www.vfaq.com/mods/ICtester.html
http://www.vfaq.com/mods/ICtester.html
Edited by alltime01, 14 February 2012 - 12:52 PM.
#6
Posted 22 February 2012 - 10:02 AM
caged
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Thats normal. Is it factory ecu or after market? Iv had the same problem, when I look back now I should of just run an idle control solenoid of some description. You can mask it up with fuel and timing around and above idle. You run heaps of ignition timing from 500-800 and then back it right off progressively till 1500rpm. Timing makes a huge difference with idle speed, so every time the rpm drops down the high timing catch's it and stops it from stalling. Not ideal but definatly the best that can be achieved with out an idle control.
4g63 GSR.
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