I'm not trying to scare you or knock your tuner's ability, but things like that are the exact reason I ended up learning how to do my own tuning. Between the check engine light stuff, the surging, and the fairly low power numbers, it seems like they are either a little wet behind the ears on these types of builds, or didn't take the time to get the details right. Either way, I'd be a little nervous.

Makes me wonder if they used the proper data for the ZR1 MAP sensor, amongst other things. While you don't "need" to change the sensor like you did, it's nice for the ECU to be able to see boost and properly calculate fuel flow when there's boost pressure in the manifold. Your tuner needs to manually activate that feature in the tune file, though.

My stock cammed LS3 runs quite smooth in pure MAF mode. My intake is pretty similar to the stock unit, though, so maybe that helps. I've been meaning to play around with SD, but I really have no reason to. Your bucking/surging could be related to a number of things, really.

And I can't remember if this was mentioned, but do you have a wideband? If not, you should. That and the ability to log should be requirements to owning one of these cars, IMHO.

 

I took it to a shop that ECS specifically recommended. They say they have done hundreds of these tunes for ecs kits. Ill see what happens tomorrow before I start getting negative.

 

No doubt a MAF only setup can work.. it seems to do better on E38/E67's for whatever reason (when using a card style MAF). A few other people had the same issue I had when using a card style MAF on an E40

Regardless... I think we all can agree there shouldn't be any surging on a stock cam'd car

With as much time as it's taken me to get the tune right on mine.. I wouldn't say bad things about the shop yet. Give them some time to try to make it better.

 

That's exactly what mine was doing. Went SD and it disappeared.



Mine was tuned by Matt@FSP who's more than reputable. SD just made the car drive better. Every car is different but pre methanol just LT headers and ECS1500 he ripped on a MUSTANG dyno 574 / 532 on my C6. Matt doesn't try to over push a car but certainly gets a lot out of a little bit of mods.

 

Check engine light was evap codes, nothing to worry about. Checked over system and no issues. No issues on test drive.

The maf readings are very scattered on a constant RPM run. The tuner said he is going to reach out to ECS about some potential fixes... Showed me the datalog of the maf readings from 7-22 all while at a constant rpm. So I guess ill just wait to see what ECS says to the tuner. Basically saying there is nothing he can do with the tune to fix this...

It would be cool if an ECS rep got in here with his thoughts. Not a huge issue, but I'd like to be able to happily drive my car when im not racing around... Daily Driveability is not the greatest.

 

Mine was doing the same thing.. I still haven't figured out why some people don't have that particular issue but some do.

Adding a honeycomb prior to the MAF will likely help

SD would obviously get rid of using the MAF so that would take care of it too

 

To me it deff sounds like a tuner issue. SD tune should brings oem stock driveability, me and canuck have a chance to have a wicked good tuner right around the corner! Tune is a HUGE part of a setup. Let us know how it turned out.

 

There was a thread on here about some of the maf sensors being weak several years ago. They work fine stock so you would never notice but once you have increased airflow is when the weakness would become apparent. I just wonder if this might be the reason some cars suffer from the "surging" while other don't. Something to consider anyways.

Here's the thread https://www.corvetteforum.com/forums...d-effects.html

 

I've tried a "strong" one and didn't notice a difference

If anyone wants the strong one I bought to try I'd sell it for $50. I'm probably going to get rid of the MAF altogether at some point.

 

Post a pic of the maf placement......

 

I bought a strong one for mine, but I never had one of the supposed weak ones, so nothing to compare to.

 

Yea idk what to do really. The tuner said they would send an email to ECS about the issue and let me know if something can be done tune wise. I love it at WOT I really do. But I'm getting more and more upset the more I drive it normally and have this surge. I feel like spending more money to have it retuned in SD isn't right. I shouldn't have to ya know.

 

I'd be more annoyed that they tuned it MAF only when you even brought them a ZR1 MAP sensor to do it SD

See what ECS says first. Maybe there's something else that could be causing it that they know of. I've already given you my suggestion about adding a honeycomb, but at that point I'd probably just do SD and be done with it honestly.

 

I don't have any experience with the ECS charge pipe setup, so I'm not much help there. It could be the nature of the beast with how turbulent the air is across the MAF. Other than trying to straighten the air with a honeycomb deal like Schpenxel mentioned, there may not be much else that can be done other than going SD. Maybe that's why ECS does their cars SD in house? I dunno.

What was up with the evap code? Hope they didn't just change it to "no error reported".

 

We spoke yesterday on the phone regarding this. I'll be glad to send an SD file to get started N/C, or almost finished for that matter. I tune them closed loop SD because I personally feel it is a more performance oriented tune.
Speaking with many tuners over the years, some that insist on tuning MAF have told me that if they see inconsistent MAF signals, all it take sometimes to correct it is just a slight turn to the upper charge pipe and re-tighten.
Which would explain why some see it and some do not.

I hope that helps.

 

Hey Doug,

Did that shop ever reach out to you? I want to get this straightened out whether it's adjusting the pipe, or switching to the SD tune. I just wanna make sure I approach it correctly with the tuner. I'd rather not take it in and complain then somehow manage to get a blown motor haha.

 

not that is' the solution but i'd imagine Doug at ECS has the closed loop SD tunes pretty nailed at this point and assuming you're at similar elevation with not too crazy weather, the closed loop SD tune ECS would send is probably like 75% of the tune already done and wouldn't be all that hard for the shop to wrap it up. I'd hope they'd work with you on the price of a SD tune in that case since the tune would be relatively close to done, but i'm no tuner.

quality of the tuner is EVERYTHING, i've had a lot of cars and a handful of built LS cars fbodys, c5s, c6 etc tuned by everyone in my area who does LS tunes at one point or another and it is the single most important factor in these cars hands down. it's amazing the difference in driveability with my current tune vs. past tunes from other shops.

 

I also bought a ECS kit black can't wait to get into the Fl game . I bought my from TPS motorsports thanks mike hopefully receiving it soon.

 

Bottom line, SD will fix it. Doug offered a file to start with that will be close. Seems like a no brainer to me.

 

THIS!!!!
OP if you try to go around that, you'll ended up pissed, with more money waisted before going back for SD tune. What Chris is doing for you is awesome, if that ain't some great technical supports i dont know what it is!!! Props to ECS