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Engine Specific Info and Questions => IDI Engine => Topic started by: carrizog60 on January 05, 2007, 08:07:18 am
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I made all the "fast" pump mods and to incresase boost i put the wastegate bolt all the way in.(kkk24)
my problem is that the boost acts like it was a supercharger, it keeps rising as the rpm goes up...it doesent peak.
i think if i could make more boost at lower rpm i could clear all the smoke it does.
i hit max 1.6 bar at redline but at 3000 i only get 0.8/0.9 bar...
is it normal to boost react like this? or if i put a boost controller i could get full boost at less rpm?
sorry to Xpost this also in the french forum but it hasent had many replyes... :roll:
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sounds like your wastegate might be stuck open, or opening too soon? try disconnecting the wastegate. you will probably have to cut a piece of the metal line to splice into it though. plug it with something and voila. :)
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before messing with the screw i tried to take off the line and that way it would react the same way...
i was in the mood to put a MBC but the line of the turbo to WG is smaller than the one of the MBC so even with the tightest hose i can fit on the MBC it would be sloppy on the metal line...don't know how to hook it ...
so what is the normal boost reaction? peak at a certain rpm and hold till red line right?
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boost should start to come on at around 2000rpm and peak at 3000 rpm provided your foot is in the right position. i rarely floor the pedal and so if you do, you may get peak boost sooner :)
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thats the problem...the boost starts to build at +-2000 but it doesent get max until red line...
i floor the pedal but it doesent peak boost ,it keeps rising as the rpm go up...
here are some videos...
i reaaly feel the extra power almost at redline... :roll:
http://www.youtube.com/watch?v=59r3-c9-12g
http://www.youtube.com/watch?v=ELnJKeUmEU0
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thats pretty quick :) should let your car get up to temperature before driving it too hard though... stresses the aluminum from the heat of the turbo.
sounds to me like your wastegate is stuck open, or leaks. mine works flawlessly and i have since disconnected it and can spike 20 psi if i stay on it in the right rpm. (not for more than a few seconds though... no IC yet!)
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yeah always let ur car warm up
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it was warm.
i stopped to mount the camera and then as soon as i strat the car o went off.
how do i disable it?
i ran without the line going from the turbo to WG and still did the same...(the hole on the turbo side remained open so i could cause this).
so what can i do? should i mount a MBC?
any idea on how to mount it?
the hose i have for the MBC fits too large on the turbo line... :roll:
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you need to block off the hose coming from the compressor side. your boost air will just leak right out and as a result, egt's may rise.
my temp gauge reads just over half way when warm... maybe you should look into getting a new thermostat :wink:
has anyone tried spraying some sort of lube into the WG boost intake to free a 'stuck' wastegate????
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With enough fuel mine would never peak either. With out a boost controller, and the wastegate closed I would see in excess of 35psi (gauge limit). However with only 1.6bar max boost I doubt this is the case. More then likely your wastegate is slowly coming open and as such is bleeds off the boost, to a max of 1.6 bar. The easiest way to diagnosis this is unplug the wastegate from the turbo take it for a drive (be careful with enough fuel you can destroy the turbo if it hits ~2bar+ let off the accelerator) If you make more boost quicker and your max boost is up, then it was a wastegate problem and you need a manual boost controller (well really, you need one anyway). If it didn't make boost any quicker or any more max boost, then you have a tuning problem, or a turbo problem. For complete diagnosis steps from here check the FAQ.
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well i ran without the line comimg from the turbo to WG and its the same.the hole where the line gets pressure was left open so that could be the problem...
how can i hook up my MBC?
cant figure out a way to get a hose that fits the MBC on one side and fits the line on the other... :idea:
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your best bet is to go to a store and get any kind of hose that is as big as you need it. use hose clamps if you need to. heck.. flare the end of the metal line :) and that hose is sure not to come loose! you're only talking about 20 or so psi... :lol:
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i just wanted to get the same boost i have now but sooner.
all the cars i know that are modified tend to peak and then hold till red line but mine just keeps climbing...
it looks like my G60... :?
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my td does the same thing, it's because the wastegate is stuck sure, i'm gonna assume your car is the same, what is the max boost at red line? my car ran the same, i've since turned down fueling, but 3500-4800 was like an amazing range for power, everybody that road in my car when it was like that was amazed and highly impressed, that was peaking at 25 psi, usually by 4k i could have 25psi. so yeah in a sense it's gonna look like a supercharged car since the higher you rev the more air you're moving through and the more boost you're going to make, even thougha supercharger is the faster the engine spins the faster the charger spins, same thing really. the other cars that peak like you say is because their wastegate works. i bet you have the kkk turbo on your car?
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i hit 1.6 bar max.
even without much fuel i would hit 1.6bar.
i have the KKK24 turbo.
what can i do if the WG is open?i dont want to ran like that because that way i always have more fuel than boost...
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i believe your wastegate is stuck closed like mine, you're going to have to find someone to get it loose, try removing the metal line from the wastegate and then putting the aircompressor on it, this freed mine, but make sure you drive around alot afterwards, and shoot lube down in there to get it nice and loose. and hopefully it will stay free, otherwise you'll have to pull the wastegate off and clean it. the way yours is now, the only way to control boost is with more or less fuel. you'll always have as much as there is boost, like on my jetta, more fuel just made more and more boost. your only option to get it to work is to free the wastegate somehow
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so is there a way to check if it is real stuck?
i thought the problem was if it was open...if its closed it would be ok...
so if i can get it loose it will change the boost reactions right?
i want to have full boost at 3000 or 3500 not at red-line...
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if it was open you would have low boost, and if you have 1.6 bar, thats a good bit so, i'm asuming it's not open, you can make sure it's not stuck open, by taking a 10mm deep well socket and loosening the lock nut on the wastegate, then you need a 3mm allen wrench, and tighten the adjustment the entire way, then loosen it back to either where it was, or until the screw gets very loose, then tighten it again until it touches then lock it back. if that frees your wastegate which it could, then you'll stay at around 10psi.
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well so i think that could not be the problem because i was at 0.6 bar stock and to increase boost i put the 3mm allen bolt all the way in and the boost came. :idea:
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well thats the problem then, if you want it to peak you have to loosen it some, you either have it shut the entire way or you have it set at a pressure your not fuelign enough for to reach
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but how can i have 1.6bar at loer rpm?
even with this setup i have some smoke on boost...
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you will need to mess with your fuel screw for that kind of boost. a larger exhaust will definitely help too.
i would also recommend that you take off the intake plumbing going to the turbo and shine a light and see if you can verify the state of the turbine blades. there should be little or no clearance for the blades, and they should be straight and not curvy. bent blades will give poor boost qualities.
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i have a good intercooler but no EGT yet.
so there is no point on adding the MBC right?
i just wanted to increase boost at "lower"(read 3000)rpm because i still see light some on boost.
thought that on boost all the smoke would be gone that way
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thanks...
i will try to see if my wallet let me change the downpipe for one with no restriction.
also,i have my pump timing at stock.would it help to advance it a bit?
to what values?
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anyone?
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1mm to 1.05 is what people say is the best, i haven't messed with timing yet
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i can start my car without the cold start pulled now... before i had to even with 5C weather.. the timing is around 1.06mm :)
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what would be the benefits and downside in performance/reliability on setting the pump at 1 or 1.05 or more?
sorry about all the Q... :oops: