V1 LSJ / M62 Intake

[jirwin]

M62 (and I suppose TVS) guys, can you please post pictures of your intake tubes with a description? I'm running a cobbled together setup that ZZP is finding is giving weird MAF readings when getting off throttle. Looking for a better solution and wanted to see what everyone here is running.

Thanks!

 

[snirtman]

Not sure what kind of description you're looking for, but here's the stock M62 with stock throttle body, DF silicone elbow, DF MAF tube and DF air filter:

 

[Gtstorey]

M62 (and I suppose TVS) guys, can you please post pictures of your intake tubes with a description? I'm running a cobbled together setup that ZZP is finding is giving weird MAF readings when getting off throttle. Looking for a better solution and wanted to see what everyone here is running.

Thanks!

You could try and insert a honey comb air straightener in front of the MAF. Post pictures of you setup.

 

[Ross]

My intake uses the same pieces as snirtman, I just rotated my filter upwards.
This setup is at the limit of the MAF tube being too short. It is important to lengthen all the hose connection spots, to maximize the length of the intake, and help the MAF get good airflow.

 

[escapepilot]

My intake uses the same pieces as snirtman, I just rotated my filter upwards.
This setup is at the limit of the MAF tube being too short. It is important to lengthen all the hose connection spots, to maximize the length of the intake, and help the MAF get good airflow.

Looking at Snirt’s pic, it looks like the MAF tube is pushed into the silicone elbow as far as it can go. Would length after the MAF cause issues or only length before the MAF?

 

[Dsteinhorst]

I've also had issues getting good off throttle MAF readings. I had to shorten up my couplers because my fuel lines are in the way. It's the standard supercharged Goblin intake.

I've thought about a straightener or restricted MAF tube, but it runs okay as it is.

 

[Gtstorey]

I've also had issues getting good off throttle MAF readings. I had to shorten up my couplers because my fuel lines are in the way. It's the standard supercharged Goblin intake.
View attachment 41644


I've thought about a straightener or restricted MAF tube, but it runs okay as it is.

Where’s the maf?

 

[Gtstorey]

Looking at Snirt’s pic, it looks like the MAF tube is pushed into the silicone elbow as far as it can go. Would length after the MAF cause issues or only length before the MAF?

Most important is length straight length in front but straight length afterwards is also helpful. You also don’t want to abrupt transition close by.

But just to be clear because of the way you wrote the question, it’s the lack of length that is the problem. The longer/straighter the better.

 

[Ross]

Looking at Snirt’s pic, it looks like the MAF tube is pushed into the silicone elbow as far as it can go. Would length after the MAF cause issues or only length before the MAF?

It is recommended to have 2*diameter both ahead and after the MAF as straight pipe. For a 2.5" intake pipe, that is 5" before and after the MAF. So the goblin is under this recommended length...but it (barely) works.

 

[Dsteinhorst]

Where’s the maf?

It is directly below the 90 degree breather fitting that is perfectly blocking it in the picture.

 

[jirwin]

Here's my setup. The silicone 90 right before the maf is probably no bueno. Ordered a bunch of stuff, we'll see what works and what doesn't!

 

[Dale E]

One of the Goblin GURU mathematicians will have to figure the difference in the pipe diameter for the Goblin intakes versus the LS 4 inch, but

Here is what the GM crate engine control system instructions have to say about it:

"Ensure the MAF sensor is oriented correctly in the induction (it will
only read correctly in the proper direction). An arrow is located on the
sensor indicating correct flow direction. Verify this before welding the
mounting boss, as the sensor will mount only one way in the boss.

Ensure the MAF Sensor is mounted in the middle of a minimum 6 inch
length of 4 inch diameter tube, and is a minimum of 10 inches from
the throttle body."

 

[Gtstorey]

Here's my setup. The silicone 90 right before the maf is probably no bueno. Ordered a bunch of stuff, we'll see what works and what doesn't!

I’m not sure it’s possible to get a good MAF configuration on a Goblin. But that is about as bad as it can get. But it might improve by simply rotating the maf in relation to the bend.
If the maf problems are in the idle area, I would recommend that you not go larger on the tubes since that will slow the velocity down and probably cause even more issues.

 

[Desert Sasqwatch]

The 3 inch diameter pipe is 7.069 square inches, a 4 inch diameter pipe is 12.566 square inches, which makes the airflow - for the same cubic volume of air - less than 60% the flow rate for the 4 inch pipe versus the 3 inch pipe. The MAF will think there is 40% less air flowing into the engine and compensate according to the ECM program for that volume of air.

As @Gtstorey stated, it is a very bad idea to just increase the intake pipe diameter and expect more power out of the engine. Keeping with the 3 inch pipe size is highly recommended, since it is very close to the 'stock' Cobalt pipe diameter and more readily falls within the ability of the ECM tuning.

Putting one of these in the pipe upstream of the MAF will help to improve its function.
3.0 OD x .5 Airflow Straightener Screen .187 honeycomb cell mass air flow | eBay

 

[Gtstorey]

The ECM can probably be tuned for a larger size, but if the layout isn’t real good, the maf will have trouble getting a good sample and the turbulence effect seems to be magnified..

 

[jirwin]

I ended up putting an airflow straighener right before the MAF, and changing to a 45 degree silicon coupler. Will be testing on lunch to see if it made any difference.

 

[Rauq]

potentially relevant quote from Lonny:
"Also make sure you do not push your air filter on too far. The end of the MAF tube needs to blend with the radius at the base of the filter or it will cause turbulence and the MAF will misread. "

http://dfkitcar.com/forum/index.php?threads/nukers-city-goblin-2009-ss-tc-number-2-build.1324/post-65030

 

[jirwin]

Yep made sure of that too!

 

[jirwin]

Test drive didn't go any better really, though I did notice that idle free-revving went a little better. Still stalled when coming out of load. Sent to ZZP and they said that its way way better. I'm hopeful that fixes the problem!

 

[jirwin]

No stalls!!