I'm having some problems with my turbo setup, nothing major but it's getting hotter than I think it should and not running as fast as it should.
My setup is a GA16DE HS kit w/DP turbo, 370CC injectors and 240sx MAF
I checked for boost leaks a few weeks ago, found some and fixed them. It's been running better since then, but the turbo is still not spooling up as fast as it was on my other engine. This weekend I plan to do a compression test, check timing & idle, and check for boost leaks again, is there anything else I should do?
One of the leaks I found but couldn't fix last time was a minor one around where the EGR goes into the intake plenum. Is there a gasket for this? I didn't see one listed in the FSM.
Also there are a couple of other problems I'm having.
The first thing is the EGTs, if I'm not careful they can get above 1450, and they've gotten as high as 1500 once or twice. At 1500 I've been letting off so as not to melt anything, but if I kept going they would go above 1500. Anyone know why they would be getting this high at 11 PSI?
Another problem I'm having, oil pressure at idle. When the car is hot the oil pressure drops as low as ~6PSI at idle. My thought on this is the oil is getting too hot and getting thin, but I don't have an oil temp gauge to check this. I'm currently running 10w30, should I try another weight?
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2008 BMW 135i
96 Sentra GXE
Boost is addictive
265WHP/257WTQ
Last edited by aminidab : Apr 23rd, 2004 at 09:39 PM.
5W 30 can transfer faster dude.. and it woudlnt hurt to use synthetic.. it can withstand heat better.. man, its very strange.. maybe you should consider water injection. cool down the cylanders a bit.. im actually shocked that you are running that high.. i wonder if somehow the discopotato heats things up?.. im not sure if a turbocharger would have anythign to effect the heat of the exhaust.. i mean.. different styles of turbos.. im thinking maybe the oil pump is going out possibly?.. or the pressure sending unit is just trippin.
eliminate the EGR!!! also, what size is your IC, and if you're running the GT28RS.....maybe you're creating more pressure in the exhaust manifold which would increase temps.............
generally if you had a boost leak you'd definitely be able to tell. my personal opinion is that the GT28RS is too big for a stock GA16.....but that's just my opinion.
The oil I'm using in synthetic, Mobil 1. I have thought about adding water injection, but then I have to get my ECU reprogrammed and I don't have an ECU to swap out for the injectors/MAF. Wierd thing is I'm running most of the same parts from the oil pump out of my old engine and I didn't have the pressure problem.
I haven't measured my intercooler, but it is fairly large(that's real helpful, I know). I was actually thinking of cutting a bit more of the bumper to get more air to it, but that's probably overkill. I'll take some pics and get a measurement tommorrow.
I'd love to get rid of the EGR, but in the end it seems like it'd be more trouble than it's worth.
Chimmike, why do you think a GT28RS is too large for a GA16? unless maybe you think any T28 is too big for a GA16.
The egr tube has a small gasket... its part # 14719+A
Is there any leaks between the manifold and the turbo?
Cool thanks for the part # James! I don't think there are any leaks there, but I'm going to check that this weekend. I put lock washers on this time because the nuts came loose on me last time.
You may be maxing out the 370 injectors at 11 psi. Then it runs lean when approaching max power and the EGT goes ballistic.
Do you have a Walbro 255 (or equivelent) fuel pump? The stock pump is not capable of 11 psi. I blew the electrodes off two spark plugs at 6.5 psi.
Lew
I didn't mention this in the original post, but I have a GA16. I should be ok with setup at 11PSI as wes and myoung have boosted beyond 14 PSI and been ok.
yea I was thinking that too but you have the DP turbo, which may flow more than the T28 at that psi.
I've thought about that too and I figure measuring the MAF voltage would be a good way to check where I'm at. I ghetto rigged up a way to check it too... I tapped into the MAF wire on the ecu. Now I just need to find a willing passenger to read a voltmeter between that and a ground
I didn't mention this in the original post, but I have a GA16. I should be ok with setup at 11PSI as wes and myoung have boosted beyond 14 PSI and been ok.
you can't compare a turbo that makes up to 250-280whp to a turbo that makes up to 320+whp.............at the same psi the GT28RS flows more air..................requires more fuel......c'mon bro, you should know this
try turning the boost down to 7psi and see what it does
I think the GT28RS is too much turbo for a GA16 in my opinion because it can probably flow more air than the engine can handle.
My personal opinion is it's not smart to use a turbo on a car that a simple spike in boost could cause it to throw a rod or something.
I'm having some problems with my turbo setup, nothing major but it's getting hotter than I think it should and not running as fast as it should.
My setup is a GA16DE HS kit w/DP turbo, 370CC injectors and 240sx MAF
I checked for boost leaks a few weeks ago, found some and fixed them. It's been running better since then, but the turbo is still not spooling up as fast as it was on my other engine. This weekend I plan to do a compression test, check timing & idle, and check for boost leaks again, is there anything else I should do?
One of the leaks I found but couldn't fix last time was a minor one around where the EGR goes into the intake plenum. Is there a gasket for this? I didn't see one listed in the FSM.
Also there are a couple of other problems I'm having.
The first thing is the EGTs, if I'm not careful they can get above 1450, and they've gotten as high as 1500 once or twice. At 1500 I've been letting off so as not to melt anything, but if I kept going they would go above 1500. Anyone know why they would be getting this high at 11 PSI?
Another problem I'm having, oil pressure at idle. When the car is hot the oil pressure drops as low as ~6PSI at idle. My thought on this is the oil is getting too hot and getting thin, but I don't have an oil temp gauge to check this. I'm currently running 10w30, should I try another weight?
Are you exceeding 5.1 volts from the MAF? If so you are out of injector. The DP is a real effient turbo and you coulkd be maxing out your injectors and running lean.
Mike
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There can only be one Icy Hot Stunta, Don't Hate.
you can't compare a turbo that makes up to 250-280whp to a turbo that makes up to 320+whp.............at the same psi the GT28RS flows more air..................requires more fuel......c'mon bro, you should know this
try turning the boost down to 7psi and see what it does
I think the GT28RS is too much turbo for a GA16 in my opinion because it can probably flow more air than the engine can handle.
My personal opinion is it's not smart to use a turbo on a car that a simple spike in boost could cause it to throw a rod or something.
I agree that it's not a good idea to be running at that level of boost for a daily driver when pushing it too hard could blow the engine. I'm probably going to get a different WG spring to set the max PSI lower for daily driving and get a boost controller so I can slowly increase the boost.
I was thinking it was a possiblity that the EGTs were high because I had maxed out the injectors and was running lean, but I didn't think it was too likely just b/c that would be putting out a lot more power that I thought I was.
Since everyone seems to think there is a good chance this is causing the problem, I'm going to check the MAF voltage as soon as possible. So I just need to find a willing passenger, who despite what James thinks, can ride inside the car
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