Couple Vortech Tune questions!

[Cobraman]

I have all my vortech stuff set and ready to go, but my current budget won't allow for the intercooler until the end of next month. I want to wait to get the car dyno tuned until I have the intercooler so I don't have to pay the money for a re-tune.

Two options that I know of-

1. Run the car with stock maf/injectors and the fmu
2. run the car with the 39# injectors, and 90mm cobra maf, without fmu.


I know that the cobra maf is calibrated for 39#'rs and im running a T-rex inline as well as a 255lph pump, so I figure that would be all right.

Will my car live without the tune?

[jnobles06]

I have all my vortech stuff set and ready to go, but my current budget won't allow for the intercooler until the end of next month. I want to wait to get the car dyno tuned until I have the intercooler so I don't have to pay the money for a re-tune.

Two options that I know of-

1. Run the car with stock maf/injectors and the fmu
2. run the car with the 39# injectors, and 90mm cobra maf, without fmu.


I know that the cobra maf is calibrated for 39#'rs and im running a T-rex inline as well as a 255lph pump, so I figure that would be all right.

Will my car live without the tune?

i would wait. it's not a lean condition you should worry about, it's the timing on a non-intercooled blower. the stock tune will have too much and cause detonation.

[majorownage]

I have all my vortech stuff set and ready to go, but my current budget won't allow for the intercooler until the end of next month. I want to wait to get the car dyno tuned until I have the intercooler so I don't have to pay the money for a re-tune.

Two options that I know of-

1. Run the car with stock maf/injectors and the fmu
2. run the car with the 39# injectors, and 90mm cobra maf, without fmu.


I know that the cobra maf is calibrated for 39#'rs and im running a T-rex inline as well as a 255lph pump, so I figure that would be all right.

Will my car live without the tune?

Run stock injectors. Boost refrence the fuel pressure so that there is a constant delta across the rails. Lighting suck through maf. You might be able to get away with the stock, but it really starts pegging around 400hp...

There is no such thing as "calibrated mafs and injectors." Basically what reallys happens is, a bigger maf = run lean, so bigger injectors are added. The stock ECU has no idea that it has bigger injectors or bigger mafs, and the idea is to cancel each other out.

Its a horrible way to run a stock tune like this and hope for the best.

60 psi delta and you will hold 400 rwhp with 24s

Get a dyno asap before running it hard, but you will be ok if you drive it there. No trailor needed. KEEP YOUR FOOT OUT OF IT!!! lol

If you run your stock maf and injectors with a boost referenced fuel, you can run your stock tune. (The stock tune is very rich to begin.)

http://www.lethalperformance.com/96-98-svt-cobra-fuel-delivery-fuel-regulators-aeromotive-regulators-c-469_864_6361_6363

Thank me later. lol

[majorownage]

I just dont think you will hit 400rwhp with a 3.6....maybe on a dynojet. lol

[greenbullitt]

There is no such thing as "calibrated mafs and injectors." Basically what reallys happens is, a bigger maf = run lean, so bigger injectors are added

That's not how it happens. If that was true you wouldn't be able to have a 75mm maf for more than one injector size. Mafs are a cheating way, but your info isn't precise.


I forsee lifted ring lands with the info in here...

[turbos66coupe]

If you have an fmu through it in the trash.run the cobra lightning maf as a draw thru set up and the cobra injectors will be safe to past 400 rwhp. As stated the there is no such thing as calibrated mafs/injectors. Every maf has a tranfer function. The voltage the maf sends back to ecm corralates to specific amount of air mass. Any way wait on the intercooler and take your time putting every thing together. Contact andy at prime-tuning.com good guy and great tuner. I bet it does close to 400rwhp

[majorownage]

That's not how it happens. If that was true you wouldn't be able to have a 75mm maf for more than one injector size. Mafs are a cheating way, but your info isn't precise.


I forsee lifted ring lands with the info in here...

^^^^ That is how some aftermarket solutions work. No way I would ever do it.

A larger maf will report a lower voltage for a given air flow.

The EEC will translate the voltage from the new bigger maf into an air flow using a maf transfer table for the SMALLER STOCK maf. The EEC "thinks" it has less air than it really has. The band aid is larger injectors. The EEC commands a smaller pulse width, however, the larger injectors deliver more fuel.

This is a VERY GHETTO way to do things. Don't do it. There is no such thing as calibrated mafs/injectors.

[STRONGNUFF]

Just wait and do it right, anything else and you will posting up a boom bitch thread

[SVT Lurch]

Why not just leave the blower off and do it all at once?

EDIT: Ditto what Andre said.

[majorownage]

Why not just leave the blower off and do it all at once?

EDIT: Ditto what Andre said.

I agree.

Intercool, lighting maf, boost refrenced regulator, t00ned. All at once.

[Cobraman]

I agree.

Intercool, lighting maf, boost refrenced regulator, t00ned. All at once.

Why do I need to worry about a regulator? Won't the tuner take care of that?

[majorownage]

Why do I need to worry about a regulator? Won't the tuner take care of that?

You can run smaller injectors.

If you run 60 psi delta at idle, you have around 55 psi of fuel pressure. Depending on vacuum. (55 - -5psi) -5 psi for vacuum sucking out fuel from the injectors

If you don't have it boost refrenced, once you make boost your delta will go down.

50psi - 10 psi = 40 psi

Now your delta is 40. This means your injector cannot deliver as much fuel.

If it was boost referenced, it will increase the fuel pressure so that no matter what, your delta pressure is 60:

X-10psi=60psi, so "X" (fuel pressure) is 70psi

You will get more flow out of a given set of injectors. And your tuner will love you because the commanded lambda will be correct...


Remember the key to make an injector flow is pressure difference across the injector. With boost, it is fighting against you.

Stock the fuel pressure is referenced, but unfortunately the stock regulator doesn't work with boost, only vacuum.

[pr1042]

Did you buy a full kit or piece it together yourself?

[svauto-erotic855]

Stock the fuel pressure is referenced, but unfortunately the stock regulator doesn't work with boost, only vacuum.

Who told you this?

[turbostang]

Run stock injectors. Boost refrence the fuel pressure so that there is a constant delta across the rails. Lighting suck through maf. You might be able to get away with the stock, but it really starts pegging around 400hp...

There is no such thing as "calibrated mafs and injectors." Basically what reallys happens is, a bigger maf = run lean, so bigger injectors are added. The stock ECU has no idea that it has bigger injectors or bigger mafs, and the idea is to cancel each other out.

Its a horrible way to run a stock tune like this and hope for the best.

60 psi delta and you will hold 400 rwhp with 24s

Get a dyno asap before running it hard, but you will be ok if you drive it there. No trailor needed. KEEP YOUR FOOT OUT OF IT!!! lol

If you run your stock maf and injectors with a boost referenced fuel, you can run your stock tune. (The stock tune is very rich to begin.)

http://www.lethalperformance.com/96-98-svt-cobra-fuel-delivery-fuel-regulators-aeromotive-regulators-c-469_864_6361_6363

Thank me later. lol

You are trying to get this dude to blow his shit up, eh?

If there's no such thing as a calibrated MAF, then why will a car not run "right" when you switch an aftermarket MAF onto a car that has a different size injector other than what it's spec'd for?

Answer: it's calibrated!

Now, "calibration" could be left open for interpretation - it's no more than tricking the electronics by altering the airflow that actually hits the element. Slower moving air because of a bigger opening tends to lean the car out, but, Bigger MAF doesn't automatically mean lean, it means it can move more air than a stock MAF, or a stock sized MAF. If MAF's weren't 'calibrated' why are there different transfer tables for every aftermarket MAF?
If the engine can only consume what will come through a stock MAF in the first place, putting a bigger one on there won't do squat, other than make it run bad. Stock MAF's are calibrated to run with a certain amount of air moving across the tube/element.

I'm not totally familiar with the tuning strategy on the Cobras - but most any other Ford doesn't take full advantage of the 0-5V range of the MAF, they peak around 4.3V for whatever reason. (it's been a while, and my numbers may not be 'right', but you get the idea) - simply increasing the 4.3V to 4.99V nets a HUGE gain in useable flow... aka 'tuning'.