hi guys i'm new here,but i want to learn.I'm "working" on Anth 90' bin.My friend is building a 377,it is basically a bigger TPI since he loves TPI torque curve,just a slightly bigger cam,but nothing more than a 5200 rpm range cam,don't have the specs now but something like a 90 tpi cam.Thinking about future modds like a bigger cam and an highier range intake/plenum like a Miniram or a Superram i'm now focused on VE tables and Spark advance tables.From what i see the tables top at 5600 (ext) or 4800 rpm.
Knowing that bigger cam and intake engines usually have a top rev limit at 6500-6800 making power up to 6500,i'm thinking now this table need to be exteded over 5600 rpm for spark advance and 5600 for VE.
Am i wrong?Here what i did :

[IMG][/IMG]

this is for spark advance, all new cells have the same top values as previous 5600 rpm cells,just to be conservative...

Opening the VE tables i've seen that top rev limit is set at 5600,so if my new engine revs at 6800 top with a peack power at 6200 up to 6500 i think this table must be exteded too...
Again here what i did:
[IMG][/IMG]

Again here the added cells are a copy paste of previous 5600 rpm cells.Here i think values need to be changed becouse of different engine power curve. Looking at the stock table i see that highier cells are in the 3600 range,this make sense thinking about this is a TPI set up and its power band.Probably ,in a different set up, like a Miniram, a more linear power band wants highier cells are at the top of rpm range in the table. This is just to understand if this make sense,probably i'm wrong,just curious,thanks guys

 

The spark tables do not need to be extended over 4800 RPM. Whatever you use at 4800 will be fine for higher RPM conditions. A typical power curve for a SBC ramps in all the timing by 3000 RPM and it really does not have to change at higher RPM. In extreme cases where you are looking for every last bit of power after the HP peak ramping back the timing can extend the power band some but you need a very accurate dyno to figure out what needs to be done.

The VE table is a different animal and it is nice to have a VE table that extends as high as you plan to rev the car. It can be crutched by the PE table vs RPM but if you can add to your VE table that is the best.

 

thanks Bjankuski, seems to be the right way. are there other tables need to be extended the same way ?

 

Hi guys,i'm just trying to figure out the strategy not the number here:this is a school exercise for me,not a real tune. Now i'm trying to give some numbers to the VE table i've extended to 6800 rpm. Here i assume working in a 383 ci with big cam and an hi rev intake/plenum like a miniram,obviously headers...Thinking about the typical power curve of a 383 with peak power/torque on the hi band i'm setting stock Anth 90 bin numbers in a different ramp:


[IMG][/IMG]

here the stock Anth 90 VE table and 3d graph
[IMG][/IMG]

 

Your VE will peak at your max torque and fall slowly from there. I would assume your peak torque will occur around 5500 if your HP peak is at 6800. Look at the stock VE table and how it drops off after peak torque and model yours to look like that but use VE numbers that better represent the components on your engine. VE's in the mid to upper 90's is OK for a high performance engine.

 

thanks Bjankusky...something like this :
[IMG][/IMG]

 

from an old tech article,much of us know it..."Ten time the torque"It's a bench test of ten different intake /plenum set up based on a 383 ci.Based upon a 383 with a Miniram intake my simulation on new extended VE table will reflect this dyno graph:

there are two different power/torque curve,one from a TPI set up with tpis large tube runners,the other is the miniram on the same 383 sbc,according to Bjankusky advice i'm now focused on this torque band (miniram) to refine my previous VE table

[IMG][/IMG]

Since this 383 with Miniram has a peack torque in the 4800 rpm range with a flat curve i've refined again VE in the 4800 rpm range

[IMG][/IMG]

 

Keep in mind a typical engine will have a peak TQ and peak HP spread of 1000 to 1500 RPM. That is why I mentioned that if you had a peak HP at 6800 RPM the peak torque would be around 5500 RPM. The engine in your graph has peak HP at 6000 and peak TQ at 4800 RPM, if it had better heads, cam, and intake it would have higher peak TQ and HP RPM numbers.

 

I've tried also new rows in the XDF info, but this is impossible.
You overwrite another XDF info.
When you're start your engine it's running not friendly.
Maybe you can change for example 5600rpm change in 6800rpm.
I didn't try this.
Succes

 

Hi guys I'm here again with this old thread. We talk about VE tables for a ANTH 90' 3.07 auto here.i've extended the VE tables up to 6800 rpm range and i refined accordingly to a simulated 383 "minirammed" engine,or TPI ported , siamesed runner.
Now i'm trying to understand other tables like i.e PE tables and other "ADDERS tables".In addition to the technical barrier i have to face the language barrier here from Italy.....so be patient with me guys

First i need to understand what difference between Accel Enrichment and PE (power Enrichment).

I guess PE is an "adder" table that "ADD" a percentage of change to the preset AFR in relationship to RPM's or coolant temps.



Here the Accel Enrichment tables,just 4 of 7 tables in the bin.for me they are more difficult to understand:FIRST does DELTA means "variation"? When does Accel Enrichement starts? during engine Acceleration but not over a fixed % of TPS since i guess PE is only during WOT operation (more than 70% TPS).Please can you translate into a "simple" english guys?



Question 2:

When do you work on these tables PE or AE?
if i'm right a tune means create a new Bin for an upgraded engine where new components require new fuelling strategy to meet power and streetability.I think a new cammed engine need a good idling tune,a good "street range" tune and a very good refined tune for WOT operation that translate into a perfect AFR for power ,not too rich, just an hair before detonation for every cells at WOT.
With this in mind,if i'm true,we have to work on VE and Spark advance tables primarily,but other than this where do i need to work?