2 step on fuel injected cars
 

2 step on fuel injected cars I have heard that the fuel injection systems do not like it very well. Anybody have luck with or problems like going lean while on the 2 step. Working with 5.0 Mustang but would think it would be the same as a GM F.I. car.

Re: 2 step on fuel injected cars
 

I use a 2 step on my 5.0 auto Mustang stock EFI, work just fine, very consistent...............

Re: 2 step on fuel injected cars
 

Charlie I knew an old S/ST race would help out. How are you set up on the brake pedal or do you use where the brake light switch is.

Re: 2 step on fuel injected cars
 

I'm not sure if the MSD 2 step and the fi systems always work. We had trouble with an aftermarket system, went back to footbrake, went faster. On others (360 magnum trucks), works fine, worth about .02 in 60'. We have had a little trouble on fuel pressure when leaving (about 1.31 60'). Bigger pump, better, have another pump to try this year. Appears the more power, the more problem.

Re: 2 step on fuel injected cars
 

It all depends on the ECU and how its doing it, there is no deficincey of doing it in an FI system.

Depending on how its being done I can see Jeff could be right, but with an aftermarket ECU you can do spark, fuel, or both. If you do both....or fuel I could see an issue, if the ECU is doing its job right I can see having an issue.

If youre not doing it through the ECU itself I have no idea......all kinds of potential hiccups come to mind.

Re: 2 step on fuel injected cars
 

Home Depot door bell button on the brake pedal. MSD 2 step through a MSD 6A box. Works like a charm.

Re: 2 step on fuel injected cars
 

I am using a stock ECU 5.0 Mustang and was thinking on using a spare msd 7al2 i have laying around from my other car then just buy a 2 step. I am looking at using a mirco switch nuetral safety switch since i have spare laying around doing nothing and mount it to the brake pedal. just trying to be more consistant on the starting line. Thanks guys

Re: 2 step on fuel injected cars
 

I bought a seperate 2 step for my car (coil over plug system). Before the ECU manufacturer had the firmware done.
It worked just as stated cutting off the spark randomly. But the ECU was reading WOT and not doing anything about the fuel in conjunction with the spark.
My oil was fuel fouled in 2 passes (looked like it had thousands of miles on it). I was pressurizing the crankcase and pushing oil out everwhere.
Now my ECU manufacturer has finished the firmware. Got rid of the seperate unit. It works great no oil fouling or pressure in the crankcase. I can hit the button and hold it for a minute or more with no ill effects

Re: 2 step on fuel injected cars
 

Art are you saying you were pushing fuel past the rings then?

Re: 2 step on fuel injected cars
 

Exactly

Re: 2 step on fuel injected cars
 

Art what kind of car and ecu if that is not to much to ask you dont have to answer if you dont want to that is understandable

Re: 2 step on fuel injected cars
 

I use an MSD 2 step on mine with the FAST XFI ECU, no problems. It has nothing to do with the injectors, the MSD kills the spark. I had one customer having problems with that but he had his MSD grounded to the battery along with his XFI ECU. Don't do that, ground the MSD to the engine. Not the floor pan, roll cage, battery, etc. Directly to the engine. If your pushing fuel past the rings you much be over-fueling it. Don't do your launch air/fuel tuning from your wideband, if you can't do it on an engine dyno without the 2 step (I've never had mine on an engine dyno), go by your 60' times. The miss-firing while on the 2 step will make it look very lean to your wideband, you can end up leaving very rich. My wideband doesn't read correctly until nearly 6000 RPM on the launch. Just another reason they typically run quicker in open loop. It would be trying to fatten up a false lean condition. If your trying to run it in closed loop, be sure to set your minimum closed loop enable RPM well above your launch RPM. I picked up over a tenth just by putting mine back into full time open loop.

Re: 2 step on fuel injected cars
 

My ECU is a ViPec. I use LS1 coils so the only standalone 2 step I could get was from Lingenfelter The 2 step held the rpm it was set for. But the motor was over fueling.
I run open loop all the time. I don't run a long collector so the wideband is not to accurate at lower rpms.
The car has been setup on a chassis dyno using the quick tune setup in the ECU
I used a fast ECU and msd dis2. and you didn't have to worry about what to dial in. You had to worry about whether the car would start. The ViPec is a pleasure to use it starts the car with ease even in cold weather, idles great at low rpms and I don't even have the idle speed control hooked up.

Re: 2 step on fuel injected cars
 

You simply had something wrong. Never a problem with my FAST, or the other racers I help that uses them. You said before you had an older version they no longer sell or support. The guys I work with that use that older version also have no problems. You had something wrong you could not fix, that does not make FAST products bad. If your pushing fuel past your rings when on the 2 step, you still have, or are doing, something wrong.

Re: 2 step on fuel injected cars
 

Well Ed The motor that was pushing fuel past the rings, (the fast system was out of the car then) went 1.56 under (without reringing) with a ViPec Ecu. The fast people offered zero support for a unit that I had purchased new 2 years before. All they told me was to buy a new one
I guess I'm going to have to fix that terrible problem.

Re: 2 step on fuel injected cars
 

Art, curious what injectors ? The 687 cc ?

Nothing to do with the fuel in the oil, hell at 1.56 under Id agree with you, just curious how you were getting THAT much down the cylinders even :)

Was that on a turbo or NA setup ?

Cheers

Chris

Re: 2 step on fuel injected cars
 

The injectors are from a stock Pt Cruiser I don't even know what the specs are.
I'm N/A no speed screw here. We might have been able to take fuel out of the program under a certain rpm even with wide open throttle. But before I got the 2 step I'd just hold the button and mat it, the transbrake would hold the motor to 4500.
With the 2 step I'd make a run and push oil out all over the place. Clean it up and run for 10 runs without the 2 step. Clean and no problems. Try the 2 step one more time, push oil all over and break tip off a spark plug.

Re: 2 step on fuel injected cars
 

Art, if your na and it's doing that, your over fueling it. If so, try leaning it at the launch RPM and you'r likely to be faster. You evidently talked to the wrong person at FAST, as I have gotten people help with the older systems too. There are some very bright, helpful people there. I'm sorry you had problems, but if your pushing fuel past the rings on the 2 step, you still have something wrong.

That is a lot fo fuel. I wonder if the Lingenfelter 2 step is screwing with your ECU? If your battery is not grounded to the engine you might run a ground cable all the way to the engine. The biggest source of problems with EFI is grounds.

Heck, you may be as far under as the Caddy in Stock when you get it fixed.

4500 isn't very high, how big is your engine?

Re: 2 step on fuel injected cars
 

The 2 step in the ECU works fine no problems with it. It just took the designer of the ECU a couple of months to get it together. I don't overfuel now. I can stay on the 2 step for 5 minutes (in neutral).. And the plugs look normal
Grounding isn't a problem The battery is in the stock location. And I have a large cable directly to the block and to a ground plate. In the 70's We were the first car to use the MSD 404 box So I know what you mean about grounds
The people at fast told me there was only one person that could help, when I talked to him I realized if I wasn't running a GM motor there was not going to be any help. After fighting with the unit for a while I found out they they had no knowlege of the grey box. They just bought the company name then designed their own box. A few guys on here were a big help to get the car running.
The 2 step was inline with the coil packs. not connected to the ECU other than that.
The converter in the car then stalled at 4500 It has been modded to go to 5000 now.
The motor is 151 cubic inches.
When I ran stock (2.04 under) the caddy would have been no problem.

Re: 2 step on fuel injected cars
 

Before I had the Accel management system I had a 2 step setup in the car with no issues. I have it off the brakelight switch and a toggle switch to shut it off so you cant reactivate it when you tap the brake pedal.