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post #16 of 42 (permalink) Old 10-25-2019, 10:14 PM
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Keep in mind that the LNF airbox has a MAF flange in it you don't need. Most LE5 turbos use a blow through MAF in the cold side charge pipe rather than a pull through MAP in the intake like the LNF.


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post #17 of 42 (permalink) Old 10-26-2019, 01:33 AM Thread Starter
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That is a good point Robotech. I have a maf bung to weld into the cold side pipe. I was planning on making a simple cover/plate for the lnf lid maf bung hole. If i can't find a lid i will either modify the le5 cover for a curb-side outlet, or build a CAI. I will shop for a lid and decide.

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post #18 of 42 (permalink) Old 10-27-2019, 02:42 AM
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I built my CAI. A 3" straight coupler, a 3" to 2.75" 45 degree reducer coupler, a 3" 90 degree elbow and a 3" straight section along with a proper sized air filter. I think you can get it all of eBay for pretty cheap.
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post #19 of 42 (permalink) Old 10-27-2019, 10:03 AM
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Loving this thread, great information.

Ive come into a situation where someone near my has just bought 3 gxp's and 2 base model solstice from an auction(all totaled). He parting them out completely. I can basically have my pick of parts incredibly cheap. So my question is:

IF I were wanting to do this build as well, What is EVERYTHING that I need to pull off of a turbo model that I can use for the LE5 to build the turbo setup.
And a quick list of everything else I will need that I cant get off these would be great too. Rob, im going your direction here and only able to possibly do this because I can do it as cheap as possible and slowly upgrade later. Im looking for extreme budget build here. lol
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post #20 of 42 (permalink) Old 10-27-2019, 12:18 PM Thread Starter
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Rob, what brand and size air filter is that?
Also, where did you tap in for the crankcase vent? Did you use the port on the turbo?
My turbo is missing the port/tube that attaches to the compressor inlet. I was thinking about blocking it off and welding a nipple on the cai tube. Not ideal, but it would be cheap and package well.

Thomas
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post #21 of 42 (permalink) Old 10-27-2019, 12:40 PM Thread Starter
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draike,

You need to get the following:
-exhaust manifold, turbo, downpipe/cat, <all the heat shields for these, oil feed line, oil drain line, coolant feed line (with all of the line and fittings, all the way to the head, especially the banjo with barb fitting... lol), thermostat housing and tube, coolant drain line, get the airbox and lid from the turbo car (unless you want to go cai, in that case mail the airbox lid to me, lol), go ahead and get all of the turbo air piping (from turbo to throttle body, you can't use it all, but will help with mock up), intercooler with all the brackets and braces, go ahead and get all the plastic shrouds that are around the intercooler (i don't think you can use the one that the bumper attaches to, because sky vs solstice). Keep all the fasteners you come across while removing everything.

What else you will need:
-bigger injectors, map sensor (2 or more bar), the plastic piece/shroud that fills in between the bumper and the intercooler(see Rob's build for part numbers).
-a tune.
-optional: boost gauge, boost controller


I may be missing something. Hopefully Rob can fill in the blanks!

Thomas
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post #22 of 42 (permalink) Old 10-27-2019, 03:37 PM
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Originally Posted by coothethird View Post
draike,

You need to get the following:
-exhaust manifold, turbo, downpipe/cat, <all the heat shields for these, oil feed line, oil drain line, coolant feed line (with all of the line and fittings, all the way to the head, especially the banjo with barb fitting... lol), thermostat housing and tube, coolant drain line, get the airbox and lid from the turbo car (unless you want to go cai, in that case mail the airbox lid to me, lol), go ahead and get all of the turbo air piping (from turbo to throttle body, you can't use it all, but will help with mock up), intercooler with all the brackets and braces, go ahead and get all the plastic shrouds that are around the intercooler (i don't think you can use the one that the bumper attaches to, because sky vs solstice). Keep all the fasteners you come across while removing everything.

What else you will need:
-bigger injectors, map sensor (2 or more bar), the plastic piece/shroud that fills in between the bumper and the intercooler(see Rob's build for part numbers).
-a tune.
-optional: boost gauge, boost controller


I may be missing something. Hopefully Rob can fill in the blanks!
Thanks, I know ill also have to fabricate some charge pipes, or buy some. but I can work on that.

Basically im able to buy a guts pull out; engine, intercooler, intake, cat, shrouds...everything in the engine bay pretty much... for $700
so I think that's a pretty damn good offer to get most of what I need for a turbo.
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post #23 of 42 (permalink) Old 10-27-2019, 03:51 PM
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Originally Posted by Draike13 View Post
Thanks, I know ill also have to fabricate some charge pipes, or buy some. but I can work on that.

Basically im able to buy a guts pull out; engine, intercooler, intake, cat, shrouds...everything in the engine bay pretty much... for $700
so I think that's a pretty damn good offer to get most of what I need for a turbo.
Dont forget a wideband 02. Without it youll really have no idea where your AFRs sit and would make tuning more difficult. Also, its a good way to generally tell if your engine is still OK haha.

Pat
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post #24 of 42 (permalink) Old 10-28-2019, 12:43 AM
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Originally Posted by Draike13 View Post
Loving this thread, great information.

Ive come into a situation where someone near my has just bought 3 gxp's and 2 base model solstice from an auction(all totaled). He parting them out completely. I can basically have my pick of parts incredibly cheap. So my question is:

IF I were wanting to do this build as well, What is EVERYTHING that I need to pull off of a turbo model that I can use for the LE5 to build the turbo setup.
And a quick list of everything else I will need that I cant get off these would be great too. Rob, im going your direction here and only able to possibly do this because I can do it as cheap as possible and slowly upgrade later. Im looking for extreme budget build here. lol
https://www.skyroadster.com/#/topics/68089

This thread includes an entire parts list of what you need for a 2.4 turbo build using the LNF K04 turbo. Includes part numbers and MSRP prices.

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Originally Posted by coothethird View Post
Rob, what brand and size air filter is that?
Also, where did you tap in for the crankcase vent? Did you use the port on the turbo?
My turbo is missing the port/tube that attaches to the compressor inlet. I was thinking about blocking it off and welding a nipple on the cai tube. Not ideal, but it would be cheap and package well.
Just a Spectrum filter from Autozone. For the vent, I routed it to an oil catch can then back up to the fitting for the LNF line that comes off the head to the turbo but you could just put a filter in it.

Quote:
Originally Posted by Draike13 View Post
Thanks, I know ill also have to fabricate some charge pipes, or buy some. but I can work on that.

Basically im able to buy a guts pull out; engine, intercooler, intake, cat, shrouds...everything in the engine bay pretty much... for $700
so I think that's a pretty damn good offer to get most of what I need for a turbo.
I have a set of 60# injectors I just took off my car for sale as well for $125. Plug. Plug. Plug. Lol

Quote:
Dont forget a wideband 02. Without it youll really have no idea where your AFRs sit and would make tuning more difficult. Also, its a good way to generally tell if your engine is still OK haha.
HIGHLY recommend this. Not totally necessary, but can be an engine saver if something really bad were to happen Nd it is a great tuning and troubleshooting tool. I have and AEM unit that I can log its output on HP Tuners when I scan my car. Tuners LOVE having live wide band O2 data in the logs.


V.A.L. (#1108)
2007 2.4 Base
MagnaFlow dual outlet, quad tip exhaust test car
**Sold**

Max (#1547)
2007 TURBO 2.4
Too much to list here. See my Garage for details.
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post #25 of 42 (permalink) Old 10-28-2019, 12:27 PM
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Thanks guys. Im seriously thinking about doing this. Looking like I can do the entire thing for around $1200-1500 +tune. Vs the Hanhs kit for $3800...Im liking this idea. lol
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post #26 of 42 (permalink) Old 10-28-2019, 01:06 PM
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Originally Posted by Draike13 View Post
Thanks guys. Im seriously thinking about doing this. Looking like I can do the entire thing for around $1200-1500 +tune. Vs the Hanhs kit for $3800...Im liking this idea. lol
Mine was around $1200 but I got the turbo, exhaust manifold, water/oil lines, intercooler, charge pipe, coolant tube, and thermostat housing for free...basically I had an entire LNF with turbo given to me so I also had all the nuts and bolts that went with those things. I also got an LNF downpipe for $50.


V.A.L. (#1108)
2007 2.4 Base
MagnaFlow dual outlet, quad tip exhaust test car
**Sold**

Max (#1547)
2007 TURBO 2.4
Too much to list here. See my Garage for details.
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post #27 of 42 (permalink) Old 10-28-2019, 01:56 PM
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Originally Posted by Robotech View Post
Mine was around $1200 but I got the turbo, exhaust manifold, water/oil lines, intercooler, charge pipe, coolant tube, and thermostat housing for free...basically I had an entire LNF with turbo given to me so I also had all the nuts and bolts that went with those things. I also got an LNF downpipe for $50.
Yeah, I don't get that lucky. lol. But I figure and entire engine bay and exhaust pull out from a gxp for $700 is pretty good. and at least a good place to start.

Other than the brackets and plastic surrounds for the intercooler not fitting the same, is there anything else I should be cautious of going with the GXP setup?
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post #28 of 42 (permalink) Old 10-28-2019, 03:14 PM
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Originally Posted by Draike13 View Post
Yeah, I don't get that lucky. lol. But I figure and entire engine bay and exhaust pull out from a gxp for $700 is pretty good. and at least a good place to start.

Other than the brackets and plastic surrounds for the intercooler not fitting the same, is there anything else I should be cautious of going with the GXP setup?
Support brackets should all fit, it's only the plastic duct work that may be a bit different.

You need injectors. The LNF injectors are completely different (Direct injection of the LNF vs the port injection of the LE5).

The cold side pipe of the LNF is nearly useless. You need a 2.75" pipe with about a 70 degree bend in it for the LE5 cold side from the intercooler to the throttle body but 2.75" pipe is not a common size (you can get it, but not common). If you can't get 2.75" pipe, get 3" pipe and a 2.75" to 3" 90 degree elbow for the cold side pipe to throttle body connection. All connections at the intercooler are 2.5" so a 2.5" to 2.75" (or 3" depending on what you get) straight connector for the cold side pipe to intercooler will also be needed.

Of course, depending on pipe size will also dictate which size MAF bung you'll need. It may be here that finding a 2.75" MAF bung will be hard. I have found 3".

Whatever you do though, DO NOT make your cold pipe from 2.5" tubing. Trying to tune the MAF to go DOWN in pipe diameter is a nightmare. Some tuners won't even do it. My pipe is a 3" from RPM that I had made after I had a 2.5" made and tried to tune for it. Far easier tuning for a larger size than a smaller.


V.A.L. (#1108)
2007 2.4 Base
MagnaFlow dual outlet, quad tip exhaust test car
**Sold**

Max (#1547)
2007 TURBO 2.4
Too much to list here. See my Garage for details.
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post #29 of 42 (permalink) Old 10-28-2019, 03:43 PM
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Originally Posted by Robotech View Post

The cold side pipe of the LNF is nearly useless. You need a 2.75" pipe with about a 70 degree bend in it for the LE5 cold side from the intercooler to the throttle body but 2.75" pipe is not a common size (you can get it, but not common). If you can't get 2.75" pipe, get 3" pipe and a 2.75" to 3" 90 degree elbow for the cold side pipe to throttle body connection. All connections at the intercooler are 2.5" so a 2.5" to 2.75" (or 3" depending on what you get) straight connector for the cold side pipe to intercooler will also be needed.

Of course, depending on pipe size will also dictate which size MAF bung you'll need. It may be here that finding a 2.75" MAF bung will be hard. I have found 3".

Whatever you do though, DO NOT make your cold pipe from 2.5" tubing. Trying to tune the MAF to go DOWN in pipe diameter is a nightmare. Some tuners won't even do it. My pipe is a 3" from RPM that I had made after I had a 2.5" made and tried to tune for it. Far easier tuning for a larger size than a smaller.
Im surprised by this, thinking back im pretty sure my charge piping from the PAW kit is all 2.5" (didnt measure them though) except on the cold side a slightly larger diameter pipe is integrated for clearance where the MAF sits. The air intake is a 3" though and its bigger than the charge pipes so i know those arent 3". May have to go measure them now and see what they are.

I wonder if the smaller diameter pipe gives the air flow more turbulence (and thus the MAF doesnt give an accurate reading so then its harder to tune)? Im interested in why the smaller diameter is bad for maf but bigger is okay. Guess i shouldve paid more attention in my fluid mechanics classes haha.

Pat
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post #30 of 42 (permalink) Old 10-28-2019, 05:15 PM
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Im surprised by this, thinking back im pretty sure my charge piping from the PAW kit is all 2.5" (didnt measure them though) except on the cold side a slightly larger diameter pipe is integrated for clearance where the MAF sits. The air intake is a 3" though and its bigger than the charge pipes so i know those arent 3". May have to go measure them now and see what they are.

I wonder if the smaller diameter pipe gives the air flow more turbulence (and thus the MAF doesnt give an accurate reading so then its harder to tune)? Im interested in why the smaller diameter is bad for maf but bigger is okay. Guess i shouldve paid more attention in my fluid mechanics classes haha.
Stock the 2.4 comes with a 2.75" intake. In that intake is the MAF. MAF's work by taking a reading of the airflow moving over them to determine how much air is coming in but this is just a measurement of the rate of flow (or how much the Mass of Air is that is Flowing over the sensor). Imagine the air as a stream of water. You have a stream you can walk across moving 5 mph...then you have a section of Mississippi river moving at 5 mph. Both are flowing at the same rate but which one is moving more water? The MAF has the same issue. A smaller pipe is going to be moving less air for a given MAF reading than a larger pipe is for the same MAF reading.

It is the role of the MAF tables (we have two, a low range table and a high range table...why we have two I have no idea as the high table picks up where the low table leaves off and you think of them as one big continuous table...) to interpret how much air is moving into the engine for a particular MAF reading. Go down in pipe size the numbers in the table have to be scaled down. Go up in pipe size and they have to be scaled up.

The other issue is you want that MAF's sensor to be as close to the center of the pipe as possible. 2.75" is ideal but you can go between 2.5" and 3" and still have it close enough. But for a 2.5" pipe you have now increased the chances of running off your MAF sensor's scale...and running off the scale means the ECM has to start guessing how much air above the maximum value for the MAF is really coming in to add the proper amount of fuel. Not good. Going to a larger pipe means you scale the MAF range down and you will be getting more air for a given MAF reading. Since we are forcing more air in than GM originally designed, this is a better solution because we will be less likely to run off our MAF when we are pushing in more air.

Thus the area around your MAF is critical. RPM may have done 2.5" by the intercooler then stepped it up to 2.75" or 3" before the MAF. I have attached images of my 2 cold side pipes. The first is a 2.5" pipe I had made originally. The second is one made by RPM just for me as a one off out of a 3" pipe.
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V.A.L. (#1108)
2007 2.4 Base
MagnaFlow dual outlet, quad tip exhaust test car
**Sold**

Max (#1547)
2007 TURBO 2.4
Too much to list here. See my Garage for details.

Last edited by Robotech; 10-28-2019 at 05:24 PM.
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