always faster

Did a lot of reading and all i can read is SD tune and only sd tune.I dont wanna start another MAF vs SD but ....

Can i get a maf tune since my car is a street car only but will get over 1000hp ???

What maf type should i get ???

Thanks
Eric

ysb02

You'd use the stock MAF and scale the tune. Our ecus are limited how their MAF readings which is why it's common to switch to SD. Mine is 99.9% street on SD. Idles + runs as good as it did stock.

always faster

So no need for a card style maf , just run the stocker.
Ok.

0Tampa Tuning

The reason you may be hearing to run in speed density is because with your 1000 HP Corvette, you may be running out of room on your MAF scale.

There's ways around that, but the more common way is to run in SD mode for fueling.

Im a fan of the MAF, and if you can use it, Use it.

Phil
Corvette tuner in Tampa www.TampaTuning.com

ysb02

The limitation for MAF is the ecu not the actual sensor. So sensor type doesn't matter at all.

always faster

I wanna keep the maf , it make perfect sens for a street car.
Whats the way around that ???
Any way to get bigger maf scaling ???

There must ne a way

BLOWNBLUEZ06

You can try expanding your charge pipe where your MAF is to a 5" to try to shift the physical scale down within limits or your can also use a frequency divider. They're actually very basic and relatively easy to build using a flip flop chip.

If you want to just buy one, you can probably get something from someone like Split Second.

Here's one that might work. You can call them to confirm. It would cut your frequency in half, so you would simply shift your values down. If you need to scale it back so that it fits within the overall limits then you can scale the injectors values accordingly or manipulate the stoich fueling values. There are a lot of methods to get what you want.

I would bet that you can't tell the difference between a properly SD tuned and a MAF tuned car.


Bret

lt1z

It depends on your ECM and OS really. With C6 stuff keeping that MAF isn't an issue but with a C5 PCM going SD is the usual solution since the hard coded MAF limits will cap power.

SBCGENII

It might be hard coded but their are ways around it like Bret mentioned above.

always faster

I agree , but no one in the Quebec ,Canada area does SD tune.Also a lot of shop doesnt even know how to properly tune a car on the street....
Can you elabortate more on the Split Second option ???

realcanuk

You're right. It is tough to find a good tuner here. I had a great one but he went to California to work for Tesla. Sucks to lose him.

I do my own tuning but he would help me out here and there. I was running MAF only for years with no issues and just recently tuned my VE and went blended. Works good also.

Mine is a C6 but I think the C5 has lower MAF limits, so I can't really help you out much.

Remote help might be you're best choice if you don't want to travel for tuning.

always faster

Dont mind travelling , i heard that Kevin @ championmotors does a great job tuning SD but no solid fact.I wont tow my car 7 hours away on some "maybe"

And yeah i would like to keep a maf setup.

Pekka_Perkeles

Now, there's a risk that the flow itself at lower TPS openings may become unstable around the card-style MAF. And that's not good, since the engine will surge if the flow is not stable.

I've seen this on some setups, especially with card-style MAF.

BLOWNBLUEZ06

I'll call them and let you know.

As you know, from the factory, the PCM's operate a balance between SD and MAF below 4kRPM. Although I'm not a fan of MAF only tuning, I've had a lot of MAF-only tuned C6's come to me and they didn't have any significant issues at low engine speeds and light throttle.

Pekka_Perkeles

I know, I know... :-)

With regards to C6, I've only once seen it and here's the screenshot:



https://www.hptuners.com/forum/showt...S3-A6-Corvette

Others having similar problems have been mostly crate LS engines with E67 PCM and card-style MAF in a large pipe...

realcanuk

That scan is obviously from a car with some issues... I can assure you a MAF can be smooth if placement is good.

Pekka_Perkeles

That was stock car. Logs don't lie and that car was surging.

But I do agree, when everything is right, MAF is stable. I've seen it countless of times, as you have as well.

But there's a risk with big "aftermarket" tube and card-style MAF. Sometimes it does work, sometimes it doesn't. Again, logs will show it.

realcanuk

Agree... most common issue with aftermarket tube is putting the MAF in a bad spot. When i went to 4 inch tube, I had to move it once to get it really good. My first choice of spots sucked ....LOL

always faster

Pm sent

ysb02

I know you didn't want to get into a maf versus sd but sd mode is very easy to tweak yourself using hp tuners. You should only have to use a tuner to lay down a base map then tweak yourself from road logging. This should help if your tuner is 6 hours away.