ANOTHER boosted 5.3 build with summit bottom end
03-13-2020, 12:27 PM
#521
What ecu is in a gto?
I’m assuming it’s not a P01 or P59?
Scaling doesn’t reduce resolution. Just changes the numbers in the tables. 50% is smart, reduce by 1/2.
The timing table changes rather dramatically. You need to double the g/cyl values in your head. Sadly we can’t change that axis labeling.
I don’t scale mine. I simply tune timing for the max boost I’m running and live with the loss in performance when I run lower boost.
2 bar to 3 bar you do lose resolution, but it’s not an issue.
On the two step step I adjust the timing in the table for that condition. Works great. Those areas of the timing table aren’t hit during normal driving. At least not in my car, so it’s essentially invisible.
I’m assuming it’s not a P01 or P59?
Scaling doesn’t reduce resolution. Just changes the numbers in the tables. 50% is smart, reduce by 1/2.
The timing table changes rather dramatically. You need to double the g/cyl values in your head. Sadly we can’t change that axis labeling.
I don’t scale mine. I simply tune timing for the max boost I’m running and live with the loss in performance when I run lower boost.
2 bar to 3 bar you do lose resolution, but it’s not an issue.
On the two step step I adjust the timing in the table for that condition. Works great. Those areas of the timing table aren’t hit during normal driving. At least not in my car, so it’s essentially invisible.
what timing should I be giving it on the 2 step say at 2-4psi?
03-13-2020, 01:11 PM
#524
that’s what I’m reading. And I brought my laptop to work so I’m scaling it in my feee time. However. When I cut everything in half on the ve table, the numbers are so close in many areas that are almost the same. How is that going to work? Check it....
scaled
before scaling.
does this look right to you and how is it going to control fuel like that?
03-13-2020, 01:17 PM
#525
I haven't scaled a SD tune before but that looks right. You still have differences cell to cell. You're telling the ECU that the engine is 50% smaller, and so is the airflow and fuel injectors. There's a specific table in the airflow section for engine size that you'll cut by 50% too. Basically it thinks everything is smaller but it's all been changed proportionately. Greg banish has a video where he takes a Z06 with 60lb injectors that is running and tuned perfectly, scales everything and it starts right up with the same AFR and everything. And things like injector duty cycle and engine load are still accurate. I wouldn't go making a full pull until you do it all and get some idle and cruising BENs to make sure you scaled everything right. Then go from there.
03-13-2020, 02:04 PM
#526
I haven't scaled a SD tune before but that looks right. You still have differences cell to cell. You're telling the ECU that the engine is 50% smaller, and so is the airflow and fuel injectors. There's a specific table in the airflow section for engine size that you'll cut by 50% too. Basically it thinks everything is smaller but it's all been changed proportionately. Greg banish has a video where he takes a Z06 with 60lb injectors that is running and tuned perfectly, scales everything and it starts right up with the same AFR and everything. And things like injector duty cycle and engine load are still accurate. I wouldn't go making a full pull until you do it all and get some idle and cruising BENs to make sure you scaled everything right. Then go from there.
Working on it right now. cant hurt to try it I guess. Just really time consuming.
03-18-2020, 11:49 AM
#527
Launching!
03-18-2020, 12:03 PM
#528
That would be THIS ONE... Having tried the Stoich/AFR method and this, I feel that this method is more flexible when done properly.
03-18-2020, 02:08 PM
#529
That would be THIS ONE... Having tried the Stoich/AFR method and this, I feel that this method is more flexible when done properly.
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G Atsma (03-18-2020)
04-20-2020, 09:31 AM
#535
That would be THIS ONE... Having tried the Stoich/AFR method and this, I feel that this method is more flexible when done properly.
I purchased this just now. I'll let you guys know how it turns out.....
04-20-2020, 11:38 AM
#537
Right now im in a situation. I put 80lb dekas in yesterday. Decided to weld on my 6an fitting to my regulator. That didnt go well. I had to pull the rails off four times because the weld kept cracking. I think I was using the wrong filler rod. O well. Now I'm ordering a fasster fuel rail kit. I really didnt feel like doing the fuel system right now, but I may be forced to. I'm rethinking my choice of two pumps, I may just do one big pump with upgraded wiring. I'm I wanted to make (eventually) a max of 750-800 rwhp, What single pump could I use? On pump fuel with meth. Looks like a 450 wont cut it either. might have to bite the bullet and do twin pumps.
04-20-2020, 11:46 AM
#538
You don't need the MAF. And if you're talking about a stock MAF, there's no point in putting it back on because you'll max out the frequency. Scaling the tune buys you around the airflow limit, but doesn't get you around the max frequency the maf can output, similar to maxing out a 2 bar map by running more than 14.7 psi. Now if you're talking about installing a card style MAF in a tube that's a different story, but it sounded like you meant a stock MAF.
Im a fan of duals because the cost of a big single is typically much more than 2x the cost of smaller duals lol. What's your pump now? You have a 450 intank? I've hard those 525's will flow 10% more than a 450, but not real world experience. Meth is just a safety or are you going to use it for part of your fueling? You can probably get there with a single 450, solid voltage at the pump and a decent nozzle for meth flow.
Im a fan of duals because the cost of a big single is typically much more than 2x the cost of smaller duals lol. What's your pump now? You have a 450 intank? I've hard those 525's will flow 10% more than a 450, but not real world experience. Meth is just a safety or are you going to use it for part of your fueling? You can probably get there with a single 450, solid voltage at the pump and a decent nozzle for meth flow.
04-20-2020, 12:07 PM
#539
I'm confused. So walbro makes a 525 "hellcat" pump, its rated at the same Hp that a 340 aeromotive is rated at. Is it just overated vs the aeromotive? i know the aeromotive is true to its rating or under rated in all the tests I saw.
I have two aeromotive 340's but only 1 installed.
I do have a card style maf I could use, but if theres no advantage to it, then I'll skip the hassle. If there was a way to just use the maf at idle and cruise, that would be ideal for me if it helped fuel mileage.
I have two aeromotive 340's but only 1 installed.
I do have a card style maf I could use, but if theres no advantage to it, then I'll skip the hassle. If there was a way to just use the maf at idle and cruise, that would be ideal for me if it helped fuel mileage.
04-20-2020, 12:23 PM
#540
If you have a card style MAF, there is definitely an advantage. Re-read my last post. There's no advantage to a STOCK MAF. The way the stock tune works is its blended an idle/transition/low rpm. There is a cell "rpm threshold for airflow calc" that you set an RPM above which it only looks at the MAF and not the MAP. If I were you and I already had the 340's, I'd run both with good wiring/fuses, add the meth and re-evaluate.