VEMS Community Forum
VEMS => Calibration & Mapping => Topic started by: Durr McDanks on October 24, 2015, 12:43:08 am
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I have a gt2871r with a .63 AR running 440cc injectors on an AAN (inline 5 20vt 2.2l). I am having some problems with late spool. I hit full spool around 4500 rpm's when it should be about 3500-3700 rpms. I attached a log below to give you guys a better picture. I have not messed around with the timing too much so I am not sure if the solution to my problem is to throw more timing down below. I have also pressure tested the system and found no major leaks. I am running version 1.5.3. Thanks in advance.
https://drive.google.com/file/d/0B953i4woSzc9dlJwazZER1ByazQ/view?usp=sharing (https://drive.google.com/file/d/0B953i4woSzc9dlJwazZER1ByazQ/view?usp=sharing)
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Boost refDC settings seems good to me,
have a look at the wastegate valve, a leak is often causing late spool. This wastegate-assembly is easy to check and maintain.
Also check the N75 valve, if it's leaking, the control pressure rises even with 100% refDC.
late spark should'nt causing late spool this much, resulting higher egt is even better.
Activate the EGO closed loop control, you are running quite rich.
regards :)
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I vacuum tested the external wastegate top port today with a mighty vac at 20 in hg and I was losing about 1 in hg per min. I understand that this can cause slower spool time but is this a minor or massive leak? I also tested the n75, even though it is fairly new, and I was receiving an accurate ohm range and it was clicking when being jumped.
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I vacuum tested the external wastegate top port today with a mighty vac at 20 in hg and I was losing about 1 in hg per min. I understand that this can cause slower spool time but is this a minor or massive leak? I also tested the n75, even though it is fairly new, and I was receiving an accurate ohm range and it was clicking when being jumped.
what boost wastegate spring holds without ecu boost controll? or what is the mechanical boost? maybe your spring is just too weak, so backpressure is opening it :)
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1.9 bar spring from 034 motorsports and I have an adjustable perch and cranked it down a little more and saw no difference in spool time
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I am starting to believe that the valve seat is worn out in my wastegate. If I take off the wastegate and test the bottom port with an air compressor and the valve guide is worn I would feel air leaking past the valve below .9 bar correct?
http://www.efiexpress.com/catalog/product_info.php?products_id=56
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yes, even if the valve guide is worn and control pressure is leaking, this spring should withstand the exhaust gas pressure as long as the valve seat is intact.
Disassembling the wastegate will show the seat condition.
I have also pressure tested the system and found no major leaks.
...there should'nt be any leaks at all between Compressor-outlet and intake-manifold ;)
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1.9 bar spring from 034 motorsports and I have an adjustable perch and cranked it down a little more and saw no difference in spool time
1.9 means it can hold 1.9 with ecu control, without it it will usually hold something like 0.9 or something
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I took apart the wastegate and the diaphragm is fine. The valve and seat looked like they would seal but the seat just popped right out of the wastegate. I am not sure if that's normal or if the seat is suppose to be pressed in. I would assume the seat has to be pressed in because every time the valve lifts that would mean the seat would rest on the exhaust manifold and rattle and then the valve might not seat properly the next time it comes down leading to a leak.
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The seat is not pressed in, that's normal. It is holding in place by the bolts.
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Dang, thought I had found something. Also, I do not have a gasket between my wastegate and manifold. I was reading that this is normal but I also see gaskets online for this. Should I buy a gasket or is this unnecessary?
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Dang, thought I had found something. Also, I do not have a gasket between my wastegate and manifold. I was reading that this is normal but I also see gaskets online for this. Should I buy a gasket or is this unnecessary?
there is no gasket :)
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I have a gt2871r with a .63 AR running 440cc injectors on an AAN (inline 5 20vt 2.2l). I am having some problems with late spool. I hit full spool around 4500 rpm's when it should be about 3500-3700 rpms. I attached a log below to give you guys a better picture. I have not messed around with the timing too much so I am not sure if the solution to my problem is to throw more timing down below. I have also pressure tested the system and found no major leaks. I am running version 1.5.3. Thanks in advance.
https://drive.google.com/file/d/0B953i4woSzc9dlJwazZER1ByazQ/view?usp=sharing (https://drive.google.com/file/d/0B953i4woSzc9dlJwazZER1ByazQ/view?usp=sharing)
btw, how your exhaust looks?
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I have a 3'' exhaust system all the way thru with a wagner tuner rs2 EM. I check for pre turbo leaks with some soapy water and found nothing.
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I have a 3'' exhaust system all the way thru with a wagner tuner rs2 EM. I check for pre turbo leaks with some soapy water and found nothing.
that's really really strange, you must have full boost like 3200rpm or something with that size turbo..
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I decided to visually insect the piping because it can be hard to hear air leaks when you have to take the oil cap off during pressure testing but I found this:
(http://i664.photobucket.com/albums/vv9/durrmcdanks/Mobile%20Uploads/9D2E20C0-A127-4313-B484-4DA46763388C_zpszymqxa81.jpg) (http://s664.photobucket.com/user/durrmcdanks/media/Mobile%20Uploads/9D2E20C0-A127-4313-B484-4DA46763388C_zpszymqxa81.jpg.html)
Backside of the pre inter cooler piping. I am going to replace this section with aluminum piping because this is the second 034 silicone hose that has ripped.
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;), also have a look at the whole boost piping and intercooler section, an unusual (bigger) pressure drop caused by constrictions leads to slow boost too,
Glad you found something :)
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Fixed and still no difference in spool time :/. Ran another boost test and this time I capped off the the line that runs to the valve cover and heard/saw (soap) no boost leaks. I have a Wagner intercooler that has a core size of 500x205x85 which is big but could this cause this much boost lag? I am stumped at this point. I also have 7a cams and double checked the timing, I will get a picture up.
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Try a 5th gear run that will properly show your best possible boost threshold at this point.
Boost lag and threshold are two different things, lag is a transient element while threshold is more of a stationery element.
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Have you tried to remove the hose(s) to the wastegate to see what difference it makes? Reading this thread i think you're using the stock wastegate, removing / blocking the bigger bottom hose should get you around your 1.9 bar (leave the wastegate ports open, block the tubes that went to it.)
This way you can rule out electronics / tune to help narrow down whats wrong / going on.
You could add a pressure regulator / schrapnel knob to the top of the wastegate and carefully turn up boost as another test.
Also look / listen for exhaust leaks between the head and turbo.
Do you have a silicone intake tube? If seen flimsy ones collapse and choke off the turbo.
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I had this setup without 7a cams. Made over 1.5 bar boost at 3k rpm. Over 1.7 bar at 3.5k rpm if you wanted.
Maybe it's the 7a cams?
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I was reading up on 7A cams and I think you may be right. I am running both exhaust and intake 7a cams. I suppose there is only one way to find out.
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Just saw this thread,your car has exactly the same setup like mine.GT2871/KKK AR.63 Wagner 'EM bla bla bla.on 4 or 5th gear iirc.
1 bar @ 3000RPM
1.5bar @ 3200RPM
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activate "Apply max DC until -30 kpA"