Fired up new Build- Trying to diagnois surge- LS2 TT

[Lakegoat]

Nope, Use your STFT table numbers that you need to change, highlight, paste special half, into your VE table and BOOM, the crystal ball strikes again. If you don't know which numbers then don't do it. Being new to this with a boosted application, pay him to do your whole tune cause it is a lot cheaper than a new engine.

[driftnfb]

Nope, Use your STFT table numbers that you need to change, highlight, paste special half, into your VE table and BOOM, the crystal ball strikes again. If you don't know which numbers then don't do it. Being new to this with a boosted application, pay him to do your whole tune cause it is a lot cheaper than a new engine.

will he be able to do my whole tune virtually?

[driftnfb]

I ended up watching a video on youtube, the guy copies rows and column axis from the VE table and than copies the information from the LTFT (i only logged the STFT) and special paste half onto the VE table. I tried to recreate the information Ed had produced from the the first log file since the 45PSI change and it did not do what he had revised. I made sure to get the populated information from the end of the scan


edit to add graphScreenshot (111).png (changed table to read 1:1)

[driftnfb]

Bump with new Scanner Graphs. Looks a little lean up top and still rich at the bottom. any suggestions? im adding another 2 to the final airflow seemed to help with partial throttle and idle . how long do i need to log to get LTFT? Can i special paste STFT into VE table and not LTFT?

yyyyy2.hpl

[Lakegoat]

You don't need LTFT. Use STFT's to modify the VE table. I think it is more accurate.
Something happened to your charts---only info in one column. But, it is rich at lower rpm and lean up top.
At least it is not idling at negative spark.

[GrannySShifting]

What 2.5 bar MAP sensor? I don't recommend using anything except GM or AC Delco sensors.

To expand on that, I get ALOT of counterfeit AC Delco sensors these days, presumably off of Amazon most of the time. And Walbro/TI Auto fuel pumps, and NGK plugs, and and and ....

[driftnfb]

You don't need LTFT. Use STFT's to modify the VE table. I think it is more accurate.
Something happened to your charts---only info in one column. But, it is rich at lower rpm and lean up top.
At least it is not idling at negative spark.

I think im finally getting a hold of it- the car is getting way better as I go. I did fix the graph. somehow was on psi but switched it over to kpa and it was all there.

[driftnfb]

Over the last week I?ve been watching, reading a lot and logging/Modifying the Primary VE table for partial throttle and the car is 50X better- its taken about 10 or so logs but its driveable now. I?m curious about getting into a little bit of boost. I?m seeing how a tuner had used the scanner and VE table after a small pull that ran lean and started smoothing out the table by hand to slowly dial it in with smooth transitions. I?m wondering how safe I am doing this.- I see a primary and boost VE table- I?m confused on which one to use. How do I know when to start adding timing? I think im okay with 17-19 degrees of timing to keep the heat out of the motor and be conservative. I added my most recent log for shits and grins



yyyyyyyyy8.hpl

[edcmat-l1]

I'll typically pull more timing than needed, just to keep it safe while dialing in the fueling.

Make quick hits at first. Lower gears, like 2nd and 3rd so there's less load on the motor. Hit it around 2000, lift around 4500. Check your data, adjust as necessary. Do a couple or more this way until the AFR looks close, then take it to 5000 or 5200, and so on.

Once you have the fueling straight, start adding timing. This is where having a dyno is a huge asset.

[driftnfb]

I'll typically pull more timing than needed, just to keep it safe while dialing in the fueling.

Make quick hits at first. Lower gears, like 2nd and 3rd so there's less load on the motor. Hit it around 2000, lift around 4500. Check your data, adjust as necessary. Do a couple or more this way until the AFR looks close, then take it to 5000 or 5200, and so on.

Once you have the fueling straight, start adding timing. This is where having a dyno is a huge asset.

Thanks for your help you and lake have been more than helpful to me.

just to clarify, am i using the Primary VE table for the entire test/tune?

[edcmat-l1]

You should be plotting both tables in your scanner and applying the correction to both. It's not an either or. It's both simultaneously. Always remember to keep your 105 columns the same.

[JayRolla]

Over the last week I?ve been watching, reading a lot and logging/Modifying the Primary VE table for partial throttle and the car is 50X better- its taken about 10 or so logs but its driveable now. I?m curious about getting into a little bit of boost. I?m seeing how a tuner had used the scanner and VE table after a small pull that ran lean and started smoothing out the table by hand to slowly dial it in with smooth transitions. I?m wondering how safe I am doing this.- I see a primary and boost VE table- I?m confused on which one to use. How do I know when to start adding timing? I think im okay with 17-19 degrees of timing to keep the heat out of the motor and be conservative. I added my most recent log for shits and grins

Good old Goat Rope Garage. Don't take everything he says as gospel. He went from tuning his own stuff and making helpful videos to a youtuber content creator. Contradicts himself between videos and just trying to get followers and likes. But his old stuff helped me when I first started on gen 3 and now 4 GM stuff. Watch Matt Stanford if you have not yet.

[driftnfb]

Good old Goat Rope Garage. Don't take everything he says as gospel. He went from tuning his own stuff and making helpful videos to a youtuber content creator. Contradicts himself between videos and just trying to get followers and likes. But his old stuff helped me when I first started on gen 3 and now 4 GM stuff. Watch Matt Stanford if you have not yet.

Yes i have been watching goat ropes garage. mostly videos from 3-4 years ago. ill check out Matt

[driftnfb]

You should be plotting both tables in your scanner and applying the correction to both. It's not an either or. It's both simultaneously. Always remember to keep your 105 columns the same.

I went and did a small pull and on the 2nd one it seems to hit a limp mode. the car went down to 750 idle and shuttered there with no pedal. ive had this issue before.


boost1.hpl rx7new_45 psi_EH2.hpt

[edcmat-l1]

I don't think you're logging the correct MAP pid. It hits 104 Kpa and sits there.

On the limp mode, check the codes when it does that. You might have to scale this to keep it from doing that.

[driftnfb]

Does the Map PID need to be 2 bar or 3 bar with 2.5 Bar? The tune file says 2 Bar on it. I probably didnt have 2 bar in the VCM Graphs

[edcmat-l1]

Depends what the sensor is.

[driftnfb]

im trying to read on it now. the 2.5 Bar map sensor is inputted into the PCM fine but I cannot get it to log correctly with the scanner. I tried 2 bar and 3 bar PIDs and it logging in the 10KPA column only

[driftnfb]

I have no idea how to set this up. I seen one post about getting it to work with manifold absolute pressure SAE with the correct data in the PCM but i do not see a MAP SAE - only Intake MAP (SAE) . That is not logging at all. 3 bar map and 2 bar map is logging only single column. frustrating!

[edcmat-l1]

What MAP sensor are you using? Name brand, part number, etc.?