Can this be done without an AFC

[2GAWD]

I'm trying to see if anyone has found a way of not using an AFC with 550s? I've got a 16G, walbro 255, MSD DIS2, Greddy FMIC (small), and a line up on some 550s... Any help would be appreciated.

Rob

 

[sleeper]

I think a AFPR will be more important than the AFC if you have the walbro 255 in....
And I believe if you do get the AFPR, you can turn the base fuel pressure up or down to richen/lean things out... but you can't get it fine tuned as the AFC can...

Regards

 

[2GAWD]

Originally posted by sleeper
I think a AFPR will be more important than the AFC if you have the walbro 255 in....
And I believe if you do get the AFPR, you can turn the base fuel pressure up or down to richen/lean things out... but you can't get it fine tuned as the AFC can...

Regards

But that still won't help with some of the idle issues I've heard of with going to 550s

Rob

 

[herostar]

from what I've heard, an afc is about the only deal (or at least the cheapest) you can use to compensate for the idle issues associated with 550cc injectors. with an afpr you can't turn the pressure up/down with regards to RPM's. you can pick up an AFC for 200 bucks or less on DSMtrader.com, so just look around a little, and maybe you'll have to just wait a couple of weeks to install the 550's...

 

[2GAWD]

Originally posted by herostar
from what I've heard, an afc is about the only deal (or at least the cheapest) you can use to compensate for the idle issues associated with 550cc injectors. with an afpr you can't turn the pressure up/down with regards to RPM's. you can pick up an AFC for 200 bucks or less on DSMtrader.com, so just look around a little, and maybe you'll have to just wait a couple of weeks to install the 550's...

If I hold off on the 550s then I shouldn't run boost over what....10psi....14psi? And should I hold off on installing the DIS2 due to the hotter spark, or will that not make as much as a difference?

Thanks,
Rob

 

[TurBoGs-T]

Do you mean DIS as in "direct intake system"??? If so heck no don't hold off put that baby on asap. If it's not an intake then what is it???

 

[2GAWD]

Originally posted by TurBoGs-T
Do you mean DIS as in "direct intake system"???

No, MSD DIS2 (distributorless ignition systems) if your not sure they are a great asset to any DSM. Here's some info on the
MSD DIS2.

 

[brads]

MSD is a great asset? if you like to add stuff in to make your car less reliable, yeah, they are a great asset. I run 24 PSI, stock ignition, no problems. MSDs spark output is weaker than stock, unless you get the HO version. And even then, you dont really need it. You want to upgrade your ignition? Replace the plugs and wires with new ones, stock or something close.

If you sell your MSD, that covers the cost of an AFC, or is a healthy downpayment on an really good method of adjusting for injectors, DSMLink. Once you start getting well over 20 PSI, then you can start worrying about whether or not your ignition is up to spec, and consider something else. For now, your money is better spent on fuel and timing management, as well as datalogging.

Brad

Originally posted by 2GAWD


No, MSD DIS2 (distributorless ignition systems) if your not sure they are a great asset to any DSM. Here's some info on the
MSD DIS2.

 

[Laser0385]

I've seen alot of questions regarding tuning various aspects of a car. Datalogging is just that, logging what your car is doing. Are they any engine managements systems, that effectively combine fuel, timing, boost, knock and air without spending upwards of $1,500? I was planning on going with a Palmlogging set up but want to see if reasonable priced options exist. Jake

 

[herostar]

Originally posted by 2GAWD


If I hold off on the 550s then I shouldn't run boost over what....10psi....14psi? And should I hold off on installing the DIS2 due to the hotter spark, or will that not make as much as a difference?

Thanks,
Rob

with your mods I wouldn't run over 14-15 psi on pump gas because you will be maxing out your injectors. I'd stick to no more than 14psi for now, then when you have your 550's and afc you can run pretty much however much boost you want granted it's tuned correctly to that boost level. I always hate telling people to sell stuff, but the DIS-2 isn't really helping you at all. I'd use the money from selling the ignition set to get an afc. You will probably want some datalogging software too... you can get a complete setup for a palm pilot for liek 125 bucks + the cost of the palm

 

[2GAWD]

What else can you use to provide the stutter box option except the DIS2? I see your points about it not being a requirement at this point but if I sell it is there something else that I can get to provide that function.

Thanks,
Rob

 

[brads]

DSMLink would give you the stutterbox, as would a TMO chip. DSMLink would actually fill a number of needs that you have right now: stutterbox, fuel, timing, and datalogging. To be honest though, stutterbox should be much lower on your list of priorities than the other 3. Especially trying to tune in your new injectors, a datalogger, and fuel adjustments should be your priority.

Originally posted by 2GAWD
What else can you use to provide the stutter box option except the DIS2? I see your points about it not being a requirement at this point but if I sell it is there something else that I can get to provide that function.

Thanks,
Rob

 

[DSMJim]

Originally posted by brads
MSD is a great asset? if you like to add stuff in to make your car less reliable, yeah, they are a great asset. I run 24 PSI, stock ignition, no problems. MSDs spark output is weaker than stock, unless you get the HO version. And even then, you dont really need it. You want to upgrade your ignition? Replace the plugs and wires with new ones, stock or something close.

Here is what I am going to run from MSD, now to figure out how the hell to wire up these...

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Those bad boys with the DIS2 should give me trouble free studder box. Now where can I get a clutch that never fails from?

 

[Laser0385]

Anybody heard when DSMlink will have a set-up for the 1g guys?

 

[HPF_MK3T]

Have any of you looked at the new MSD coil that is direct replacement for the 93+ Eclipse? Fairly new item.

Also, MSD makes a Stacker system that controls up to 4 coils, which is a piggyback system like the HKS DLI but at almost half the price. It splices into the existing wires and doesn't interfere with coil/injector firing where the DIS2 requires the tach adapters.. You don't have the 2 rev limiters like the DIS 2, but you still get good coil output. The DIS2 puts out from 110-115mj of power, and the Stacker puts out 120mj, so the spark "energy" is greater, ie more intense spark, but the voltage output is half since it uses the stock coils, 250V primary output compared to the 460V primary output of the DIS2, so the DIS2 will be able to jump a larger gap compared to the Stacker. The lower stacker primary voltage output is lower so it doesn't fry the OE DIS Coils.

Thanks,

 

[brads]

120mJ? Almost as good as stock on the DSMs. Impressive. The DIS-2HO is like 170mJ. Thats the only one that is better than the stock eclipse stuff, in terms of spark energy.

The 250V vs 460V thing is moot when you are talking about firing them through different coils, with different turns ratios. Its the output voltage after the coil, not at the ignition box, that determines how big the gap can be. If you put compared these on identical coils, you'd be correct. But you are saying the DIS2 shouldnt be used with the OE coil, the Stacker should be. So you should compare them at the output of the coil.

Brad

Originally posted by HPF_MK3T
The DIS2 puts out from 110-115mj of power, and the Stacker puts out 120mj, so the spark "energy" is greater, ie more intense spark, but the voltage output is half since it uses the stock coils, 250V primary output compared to the 460V primary output of the DIS2, so the DIS2 will be able to jump a larger gap compared to the Stacker. The lower stacker primary voltage output is lower so it doesn't fry the OE DIS Coils.

 

[2GAWD]

Where did you find that the stock ignition put out +-120Mj. I haven't seen anything on it.

Rob

 

[brads]

A buddy measured it. I have been meaning to get mine onto the test bench to double check the numbers just for my own curiousity, but havent gotten around to it yet. But as we had guessed from the measurements he did, the stock ignition is more than adequate. I run 20+ PSI boost on the street with a 50 trim hybrid. Stock coils. Stock wires. I had been running stock plugs too, just recently swapped them out(they were getting old), and went with a bpr-7es. Car pulls very hard. Low 12s last time at the track(20 PSI, with cat, and unleaded), with some boost loss issues. With those resolved, I expect 11s, with the car at full weight.

If you run well over 7500rpm, you will start running into a dwell problem with the stock coils and ignition, and the spark energy will go down. I cant say exactly how high RPM you have to go. I have been shifting at 8000rpm, and havent had any problems, so somewhere beyond there.

For 99.9% of us, the stock system is quite adequate.

Brad

Originally posted by 2GAWD
Where did you find that the stock ignition put out +-120Mj. I haven't seen anything on it.

Rob