Author Topic: Too many LNF's failing (Read 23283 times)

tazz · « **Reply #25 on:** July 06, 2011, 05:02:47 PM »

I remember quite some time ago reading that continued boost levels above 25psi would lead to ring land failure so My tune has always been about 23psi of boost.

kennysabarese · « **Reply #26 on:** July 06, 2011, 07:52:01 PM »

I need to get my stock sensors back!

tazz · « **Reply #27 on:** July 06, 2011, 07:55:52 PM »

I sold one of my stock sensors/connector to another member but still have the MAP sensor/connector that goes on the intake manifold.

Kelu · « **Reply #28 on:** July 06, 2011, 08:05:47 PM »

Quote from: tazz on July 06, 2011, 05:02:47 PM

I remember quite some time ago reading that continued boost levels above 25psi would lead to ring land failure so My tune has always been about 23psi of boost.

I do up to 27-29psi boost spike during the summer, over 200 drag races, engine still running after 2 years.

tazz · « **Reply #29 on:** July 06, 2011, 08:16:05 PM »

I dunno I just remember reading that figure and I really doubt any of us hear that have had turbo troubles have been boosting that much on a stock turbo I know I havent.

HAMMER DOWN · « **Reply #30 on:** July 06, 2011, 08:16:12 PM »

Quote from: tazz on July 06, 2011, 05:02:47 PM

I remember quite some time ago reading that continued boost levels above 25psi would lead to ring land failure so My tune has always been about 23psi of boost.

I should hook up my scan tool and see if I'm boosting over 23psi. Sense the 07 max out there.

Mike

tazz · « **Reply #31 on:** July 06, 2011, 08:21:47 PM »

Funny thing with the DIC it will round up or down so if you hit 22.5 or 22.6 it will read 23 but if your sustaning 23 on the DIC all the way till Redline your probably higher than 23psi no way to tell until unless you have HPT and carry it out 2 places past the decimal or possibly your scan tool..

Brazen17 · « **Reply #32 on:** July 06, 2011, 08:28:14 PM »

Quote from: tazz on July 06, 2011, 08:16:05 PM

I dunno I just remember reading that figure and I really doubt any of us hear that have had turbo troubles have been boosting that much on a stock turbo I know I havent.

We have only been boosting stock + GMPP levels. I think the highest I have seen was 24 psi but that was on a very hot day and we are at ~2500' elevation with very low humidity.

Buzzardt · « **Reply #33 on:** July 06, 2011, 08:28:39 PM »

Quote from: Brazen17 on July 06, 2011, 12:50:29 PM

I understand what you are saying but do not totally agree. Otherwise all our engines would be 2.4 and no turbo. I do agree it is not a totally built race engine but GM should have built it to withstand the GMPP tune HP/TQ and "spirited" driving. What's funny/strange is I have two turbo cars and the one that is babied is the problem child!

Checking with GM will probably revel that they did expect "some" spirited driving even of the 2.4. But no The engines are not designed to take all kinds of punishment in compression to a daily driven car, or the engines would cost around 160 to 200K. When I was younger I drove the dog out of my cars and only lost one transmission. I was lucky. I am sure if I drove this one that way I would be surprised if it would have lasted 2 years.
I am not saying that the driving style is the problem, only that it might be part of the problem. Who knows, babying these cars might be as bad on them as running the dog out of them.

tazz · « **Reply #34 on:** July 06, 2011, 08:30:39 PM »

The DIC uses the one of the Tmap sensors and the Barometric sensor to calculate the boost.

Brazen17 · « **Reply #35 on:** July 06, 2011, 08:36:24 PM »

Quote from: Buzzardt on July 06, 2011, 08:28:39 PM

Checking with GM will probably revel that they did expect "some" spirited driving even of the 2.4. But no The engines are not designed to take all kinds of punishment in compression to a daily driven car, or the engines would cost around 160 to 200K. When I was younger I drove the dog out of my cars and only lost one transmission. I was lucky. I am sure if I drove this one that way I would be surprised if it would have lasted 2 years.
I am not saying that the driving style is the problem, only that it might be part of the problem. Who knows, babying these cars might be as bad on them as running the dog out of them.

I run mine pretty aggressively and have no major problems. I did have a cracked intercooler but I think this was chalked up to a bad batch during procuction. I check the compression in the cylinders yesterday and they are all at 150 psi +/- 2 psi. I have over 50K miles on it to date. It just defies expanation why some of these engines take a beating and go on ticking and some can't survive even with minimal spirited use. The wife's redline only has 43K miles on it.

Excelsior · « **Reply #36 on:** July 06, 2011, 09:07:33 PM »

I am hitting 25psi regularly with my 08 Wester's race tune. It builds super fast, too.

Arabas · « **Reply #37 on:** July 07, 2011, 02:49:25 AM »

over here, we have 3 failed engines (that i know of). all of them had an aftermarket tune, no GMPP. all three of them are in smaller cities. i mention this because in smaller cities there is supposed to be a better chance to find shitty gas... just a thought...

DeepBlueGXP · « **Reply #38 on:** July 07, 2011, 06:21:01 AM »

shitty gas mean more knock.

GXPinKC · « **Reply #39 on:** July 07, 2011, 08:20:36 AM »

So far we have not had any problems with our after market tune of course there are no guarantee's with gas, just luck sometimes as you can always have the possibility of that happening, wrong place, wrong time, all you can do is be aware of your choices. When possible always fill up at the same location that we have trusted over time. On vacation it's a crap shoot so the odds might go up. I really don't run the Eagle as aggressively as I used to and I guess that goes with getting older. In the back of my mind is the thought that if something bad should happen to the Eagle replacement would be impossible! That does seem like a fear scenario and I guess it is and reactions are not as sharp as you younger chaps and ladies. The problem might be when you go out on vacation or to a Meet cause you have no clue.

Arabas · « **Reply #40 on:** July 07, 2011, 08:38:14 AM »

Quote from: GXPinKC on July 07, 2011, 08:20:36 AM

there are no guarantee's with gas, just luck sometimes as you can always have the possibility of that happening, wrong place, wrong time, all you can do is be aware of your choices. On vacation it's a crap shoot so the odds might go up.

Ron, i bet you could win this Kelu dude in a drag race, even with a blindfold in your eyes, even thought he is younger..

to Kelu

spicy3480 · « **Reply #41 on:** July 07, 2011, 10:11:33 AM »

The only time I ever had a misfire issue was on a tank of very bad gas when I first got the car. Since then, I have been running a Westers tune and now an upgraded turbo with no issues. I drive it daily as well, and it has about 55k miles on it. I just drove it to Canada and back with no problem...actually more comfortable than I thought. Does anyone think the failures could be linked to more than one issue? Maybe cooling was an issue as well on the failed engine cars. One of the first things I did when I first got the tune was upgrade the intercooler. Driving it harder meant higher running temperatures, so the intercooler was a big help to that. I could actually see the intercooler was doing its job when I was logging the new turbo setup and saw the IAT's were holding at lower numbers through a hard run.

Brazen17 · « **Reply #42 on:** July 07, 2011, 10:23:55 AM »

I have wondered if heat was an issue with the wife's redline. She never had a warning light nor were any cels ever set. Does anyone know what it takes to set a cel for over temp?

I know here in Vegas during the hot months whenever I park and the cooling fan stays on I will pop the hood a few inches to let the heat out faster. If at home I raise the hood all the way up and won't put it in the garage until after it has cooled down considerably.

Brazen17 · « **Reply #43 on:** July 07, 2011, 10:46:05 AM »

I do believe I am going to invest in the pillar pod mod and get an oil pressure gauge at the very least.

Buzzardt · « **Reply #44 on:** July 07, 2011, 10:59:26 AM »

Beyond the fact of just being one of the unlucky ones who get a bad engine , Preventive maintenance may be our best defense.

Brazen are you are one of a very few that check your cylinder compression before you have a problem.

Graywolf · « **Reply #45 on:** July 07, 2011, 01:53:27 PM »

In the GM ectotec build book- the LNF piston is good up to 300 hp then they should be replaced with after market pistons. Gm racing put alot of testing to come up with when failure occurs with different engine parts. Of course why should you believe them! You know plenty of people running 400hp and their engine is fine! I have not had problems with my Wiseco pistons. I was a victum of piston failure with no warranty coverage. Like it or not ,GM used some cheap parts in many areas on this car,

kennysabarese · « **Reply #46 on:** July 07, 2011, 02:46:34 PM »

Quote from: Brazen17 on July 07, 2011, 10:23:55 AM

I have wondered if heat was an issue with the wife's redline. She never had a warning light nor were any cels ever set. Does anyone know what it takes to set a cel for over temp?

I know here in Vegas during the hot months whenever I park and the cooling fan stays on I will pop the hood a few inches to let the heat out faster. If at home I raise the hood all the way up and won't put it in the garage until after it has cooled down considerably.

I've seen 225F* on my DIC and haven't had a problem.

I think I remember hearing that things shut down around 240* or so.

On gas quality...

Our cars can run on 87, and our engines will learn down the knock.

Every time you start the car it tests the gas by playing with timing. I went out logging with GMPP a few days ago. I ran HPT for about 30 minutes, and i would do WOT pulls in 3rd 4th and 5th and there would be less and less knock each time and eventually it went away. The most was still under 3*. Mostly like 1.5*

If you put water in your tank yeah you will have a problem, but unless you go from E85 to 87 and go WOT first time, I really think that the LNF ECU is great about handling varying gas quality.

Uranium-238 · « **Reply #47 on:** July 07, 2011, 02:51:06 PM »

I though the GMPP tune came with a warning to use premium fuel only?

kennysabarese · « **Reply #48 on:** July 07, 2011, 02:53:03 PM »

Yes it does, but it doesn't break if you put in lower octane. I haven't tried. But I know it's true from other members on all the other forums.

I currently have a problem with my 93 not being that great, but the knock goes away after you do a few pulls. The ECU is smart. It's fine.

GMPP turns up the boost, so if you put in 87 and slam on it, you might have bad luck and break somethng before the ECU can detect the knock, but I really doubt it.

Brazen17 · « **Reply #49 on:** July 07, 2011, 03:01:56 PM »

Quote from: Buzzardt on July 07, 2011, 10:59:26 AM

Beyond the fact of just being one of the unlucky ones who get a bad engine , Preventive maintenance may be our best defense.

Brazen are you are one of a very few that check your cylinder compression before you have a problem.

As much as I would like to take credit for being proactive I only checked my car after the wife's had problems! Might be something I start doing every now and again however. Doesn't take very much time or effort but I am not sure how helpful it would. It certainly wouldn't hurt.

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Author Topic: Too many LNF's failing (Read 23283 times)