General Supercharger Thread

What's the AFR gauge read? Does it ever richen out?

 

It's at 13-14 on both sides, didn't see it get richer so I got out of it, but before I had the gauges I hooned it all the time, so this is scary. BTW, I'll be getting your tune flashed and datalogged today now that I'm finally setup.

 

Pull up the stock narrowbands as a check for the widebands. The narrowbands will go down to 12:1, so if they're reading full rich and the widebands haven't moved then the widebands are wrong.

 

The stock AFR is showing 14 at the same time, according to my headunit's display. I managed to get it in the picture, top left.

 

Something is majorly up then. Also I would expect the wideband and narrowband to be much closer than 0.75 off from each other. Mine are usually within 0.2 at most.

If you flash the tune I sent you at least you'll have an A and B comparison, the one I sent you richens out at 35deg throttle angle. If it's still behaving the same after that tune then something really weird is happening.

 

You could test the lsu4.9 sensor. Fuel soaked rag or brake cleaner should read 8.8 or whatever the low rich range is. Think in manual it also give a test by jumping pins on sensor. But again both being out is not likely.

 

Ive got the 76 and even at 7k ft im hitting close to 9

 

They are both fairly old, so I wouldn't put it past them being buggy at the least...good thing is I ordered two new ones just in case. I'll swap out the sensors later and do a logging run with the channel layout provided by @snivilous . I'd like to have a good before and after, just to see how out of whack it is.

 

I've got the 77.5 sitting on the shelf, but I had no idea I was already close to 10PSI. If it wasn't too much work, I'd swap back to the RCF throttle body to see what difference, if any, the GM 90mm is adding.

 

Also had a full tank of gas, so that shouldn't have contributed to the lean numbers

 

Maybe do it some other time when you've got everything else dialed in better.

 

If I remember I gained 1.5 psi. I removed about 50 inches of exhaust to have it like @reywcms dumped above the axle. I'm now in the low 12's. Which is good with me...for now.
Edit: exhaust length 50in not 5ft

 

We will see what we gain back from the larger intake and TB setup.

 

That'll sure let the Whipple breathe!

 

Waiting on the final piece to arrive but here’s a preview from the mad scientist @snivilous

https://youtu.be/R5UtRoWM6lw?si=B1iGk21oBYXRq5gC

 

The difference between the sensors could be due to the stock sensor 1 in both banks is installed in a header primary tube, the AEM sensor is installed at the collector, ARH longtubes have it almost at the trans crossmember. ProSpeed moved the sensors to alleviate the idle surging and said it would be easier to tune. I'm wondering if I should do the same for the AEM sensor? Keeping it at least 18" from the head, but in a primary tube instead of the collector?

 

That's slick! Nice work @snivilous

 

My primary O2's are about 8 inches down from manifold and AEM O2 just after the collector before the first cat. Which is about 18 inches or so.

 

I just measured my passenger side, stock is about 10" from head, AEM is about 23" from stock...nearly 3 feet from the head!

4" to first bend

6" to stock sensor

4" from stock sensor to next bend

~9" to next bend

10" from last bend to sensor

 

First I need to thank everyone that helped, you guys rock!

Here is some oddness, when I first got the Non Flex ECU in, I flashed the last file I had from Sniv no problem & after the R&R it works great, he just sent a file based on the read & it fails to load. He made a new file based on his last file for the flex, removing all the flex junk & it wrote no problem.

Here's the error that freaked me out!



WTF???

 

Whats your full exhaust sytem like?

 

What, thats its brickable?

 

I got that once but I realized I didn't put my ignition fuse back in. Then it wrote fine. Another happened when I lost internet connection right when it was about to write.
I had a hotspot timer on and didnt disable it.
Awesome that you and @snivilous got it working!

 

JBA headers with 1 7/8 collector into dual 3 inch exhaust, one 200 cell metal catalyst into DirtyDeeds 6x22 mufflers exiting just above rear axle. It was one of Dirty Deeds original 3 inch true dual full race exhaust. I just measured the part I removed and it was only 50 inches not the 5ft I thought.
It's nice at cruise and wakes up when on it.
The SPD exhaust looks great but I can't justify changing mine.

 

No. That it says "Argument Null". Meaning there's no connection to ecu or unable to write to it.

 

I didn't do anything. But I'm confused, and maybe @ViktorG can answer this.

e30 puts in a new ECM. The new one can get flashed with the tune from the previous ECM. But the "stock" file that HP Tuners downloads for the new ECM is different (as expected). The new ECM file doesn't have the flex fuel tables for example, and the calibration number is different and the VIN listed is different. But that file cannot be flashed onto the ECM. Only the previous file from the flex fuel ECM can be flashed onto the new non-flex fuel ECM.

At the end of the day, as long as ethanol content doesn't come back, who cares. But it doesn't make sense to me. And say another tuner comes along and grabs the stock file from the ECM that HP Tuners downloads, well that file can't be flashed onto the ECM and just errors out. So now we need to always have the original ECMs file to use, but there's no way to actually get that besides already having it on hand... I'm lost.

 

Ok. I had it backwards about the files being written and it does not make sense.

Do you think there is another module besides the ecu that dictates what it needs to see to be in unison with the ffv side?

 

You could try swapping sensor locations and see if the readings change. Though regardless how it's setup, they shouldn't be reading that lean under boost and no way three (four?) sensors all just happen to be that far off in the lean direction.

 

@armyoffoo I know the further away it will read leaner but not that lean. Not sure if you have access to get new bungs welded in closer to AEM spec but it also may not be the answer.

 

Youve got a lit done to your engine though huh?
Just wondering as you said you gained some psi by shortening. Im on stock headers with rear cats deleted, 2.5" into Y 1 in2 out muffler and pipes out to bumper