? for you DSM Link guys

[forced power]

I just bought a Eprom Ecu and DSM link yesturday. The kid that I had bought it off of had it chipped for 850cc injectors. With my current mods I'm still on the stock 450's. SO my question to you guys is, can I get 850cc injectors and be able to lean them out enough on my current setup, or are they going to be too big for my application? I just want to avoid getting it re-chipped for stock injectors and then spend money again to buy bigger injectors next year sometime. Also, can I run 850's on a stock fuelpump or do iIhave to upgrade the fuelpump and regualtor at the same time?

Thanks - Jon

 

[doug]

You can set DSMLink for practically any size injectors with the software-- the "chipped" injector size is just the default setting for if you lose battery power and the ECU gets reset. Just zero out the global fuel slider and dead time and it'll be right back at the correct settings for stock 450s.

Also, make sure you document that sales transaction with the DSMLink people so you can get access to the DSMLink forums.

 

[ADrewzki]

Here's the math part of it.

1-(450/850) = -.47

So load up dsmlink, hit F6 for fuel, and set the global slider on the far right to -47%. That's it!

 

[Thomas91169]

-47? thats if hes running 850's

he wants to know how to run 450's.

set it to 0 on the global settings and zero the sliders out(if not zeroed already) and i believe dead time should be 0(since when altering dead time, youre actually only adding time onto the stock dead time, so then stock should be 0)

 

[doug]

set it to 0 on the global settings and zero the sliders out(if not zeroed already) and i believe dead time should be 0(since when altering dead time, youre actually only adding time onto the stock dead time, so then stock should be 0)

Exactly.

 

[ADrewzki]

Right right. My bad. Good catch guys.

 

[scottsee]

If DSMlink is chipped for 850's and you want to use your 450, you will need to adjust your fuel slider and dead time evertime you (loose constent power) disconnect your battery or when the ecu gets reset.

You will be fine on your stock fuel pump and FPR until you outflow your current injectors.
The stock 2g fuel pump (if rewired to support 13.5-14 volts) will Flow 36 Gallons per-hour (GPH) at peak t-25 compressor efficiency. Around 15psi. I read your Vehicle Mod profile and see you Ported your t-25 and are running about 17psi of boost. I'm supprised you did that. The wheel is the biggest restriction in that turbo, and it just doesn't flow enough air to challenge the housings.

I also see you're running maft! nice. just for a second I'm going to pretend it dialed to 0 and your running base fuel pressure of 43psi. Stock 2g AFR's are dialed in at 9.5:1. Together with the above fuel pump stuff your total supporting airflow is around 35lb/min. OR 122.4% IDC . The cool thing is with DSMlink abilities and the help of a Wideband if you can get your hands on one, you can get AFR's closer to Max Burn Rate Speed of 11.1:1 witch Provides best TQ.

I'm begging to babble but what I'm getting at is that your stock t-25 will not challenge your stock fuel system. And you will not need to replace your FPR until your pump pressure accedes that of the 190. Walbro 250's provide to much pump pressure and out flow the stock fpr. you're fine with your stocker until around 44GPH of fuel to the FPR which is about where the 190 is at 15psi. I might be off a few psi, but i don't have DSMlink yet to log the issue. I hope that helps, don't hesitate to PM if you need anything!

Scott See

 

[doug]

If DSMlink is chipped for 850's and you want to use your 450, you will need to adjust your fuel slider and dead time to compensate for what DSMlink is pre-set for. You will need to recalibrate DSMlink for your 450's evertime you (loose constent power) disconnect your battery or when the ecu gets reset.

Dude, stop confusing the issue. There's no "recalibration" required-- all he needs to do is zero everything out.

 

[scottsee]

Dude, stop confusing the issue. There's no "recalibration" required-- all he needs to do is zero everything out.

your right, I don't know why i was thinging 880 settings were stock 0 settings.

 

[TSiGoesPsSsSst]

How about if my dsmlink was chipped for 650s but have 860s in my car?
I assume it should be at -47 too?

 

[doug]

Yes.

Here's the math part of it.

1-(450/850) = -.47

So load up dsmlink, hit F6 for fuel, and set the global slider on the far right to -47%. That's it!

And again, it doesn't matter what it's "chipped" at-- those chipped settings are just the default values that the ECU returns to if it loses power.