IFR Value Limit Workaround - Parameters to scale?

[z06Hunter]

Ok so when u say .8 that would be assuming that I am scaling my tune 20% correct?? So I am scaling my tune by half so I would take any table that deals with airflow that doesn't have g/cyl or lb/min on one of the axis and multiply the whole table by .5?

[sabastian458]

.8 is scaling 80%, sorry. So if you were scaling 50% then yes, multiply by 0.5

[NYLS1346]

This is a very resourcefull thread and I think it should be stickied

[99LS1SS]

Alright guys, I'm going to attempt to scale a 2008 Pontiac G8 GT with the 6.0. I've gone through every table I can find in the tune and checked to see if it can or does use g/cyl. I've read this thread once, and I'll probably read it a few more times, and I just want to make sure I understand the process.

I'm going to scale everything by .7. Since this is a 6.0 liter car, I'm changing the Cylinder Volume value from 0.75000 to 0.52500. That should take car of the virtual VE tables (even though I'm going to tune for MAF only). Is that a correct assumption?

Next question is, it appears that there are 35 tables that use g/cyl. Are there ANY of those tables that I do NOT scale?

I understand how to scale the spark table so I don't think that will be a problem.

Is scaling the MAF table as simple as multiplying the entire table by .7 or is there a lot more to it than that?

Sorry for the barrage of questions. Thanks!

[DSteck]

I'm going to scale everything by .7. Since this is a 6.0 liter car, I'm changing the Cylinder Volume value from 0.75000 to 0.52500. That should take car of the virtual VE tables (even though I'm going to tune for MAF only). Is that a correct assumption?

Cylinder volume is baked into the GMVE on Gen IV cars, so it won't do anything.

Next question is, it appears that there are 35 tables that use g/cyl. Are there ANY of those tables that I do NOT scale?

No.

Is scaling the MAF table as simple as multiplying the entire table by .7?

Yes.

[wreckwriter]

I read that auto trans settings can be affected by scaling also. can anyone expand on this a bit as it would apply to a 6L80? Thanks!

[carlrx7]

Next question is, it appears that there are 35 tables that use g/cyl. Are there ANY of those tables that I do NOT scale?

I kept all the IDLE tables stock. that tab did not like being scaled.

[Snyper]

Im running 83lbs injectors on my e40ecu and I get 25mpg and the car runs absolutely perfect...maybe all this really isn't needed? But then again im running OLSD 2bar...maybe CL and non SD are different?

[HNK]

Would these be the only data that needs to be scaled under the transient fuel?

Warm up transient fuel: min decay - max decay
Transient Fuel Mass:
Transient fuel mass impact factor-GAIN
MAX MASS

[JoeCiv]

Warm up transient fuel: min decay - max decay
Yes.
Transient Fuel Mass:
Really not sure about this one. If the value represents a fuel mass, then yes.
Transient fuel mass impact factor-GAIN
No, thats a multiplier
MAX MASS
Yes.

[HNK]

Warm up transient fuel: min decay - max decay
Yes.
Transient Fuel Mass:
Really not sure about this one. If the value represents a fuel mass, then yes.
Transient fuel mass impact factor-GAIN
No, thats a multiplier
MAX MASS
Yes.

Thnx Joe,

For the impact factor gain, i was going to scale the horizontal labels as they are in G/s. I wasnt sure about the Transient fuel Mass myself since it doesnt mention what sort of units. But since it says MASS i thought it should fall under the scaling requirement.

thnx again

[Snyper]

So far so good with the 50% scaling but I have a question...when scaling the knock sensors after you transfer .8 to .4 what do you do with .5-.9? Do you 0 them out? or keep then at the last line?


Also, since I am OLSD only do I have to divide both VE and VE BOOST by .50 or leave it alone? Im sort of confused since I read both. Mine is the newer VE tables with the numbers in the 1k+

[slyb28]

Ok Lots if Good Information.
My question is do you have to do this with a return style fuel system

[DSteck]

Yes.

[Ben Charles]

I am doing a scaled tune (decided on 35% scale for my power range)
I think I know everything I need to do, but this table. Do I Multiply it by .65 or scale it like I do my trans and Timing table (shifting it)??

Thanks

[DSteck]

Shift it.

[Ben Charles]

Thank you

[5_Liter_Eater]

Super dumb question, I'm switching from 60# to 1000cc injectors so I'm starting over with a stock tune and doing a 50% scale and make sure I hit all the tables necessary based on Carl's text file. OK, fine, here's the dumb part; I'm also going to be swapping engines from my stock LS2 (364) to a 403. This would require the same scaling of all the same tables by 1.11 (403/364), correct? Clearly the VE/MAF would need to change by that 10% so it makes sense that all other airflow/airmass tables should change as well.

[07MontRedcp]

Super dumb question, I'm switching from 60# to 1000cc injectors so I'm starting over with a stock tune and doing a 50% scale and make sure I hit all the tables necessary based on Carl's text file. OK, fine, here's the dumb part; I'm also going to be swapping engines from my stock LS2 (364) to a 403. This would require the same scaling of all the same tables by 1.11 (403/364), correct?

Why wouldn't you just change the engine volume?

BJK

[DSteck]

Engine volume isn't used on E40s. It's not required by GMVE.