SAFC and 680's

[91 TSi GP]

Ok Long story short. I had dsmlink and I'm buying a house and needed fast money so I sold it, I just bought a SAFC. I also picked up a AFPR. I am running 680cc injectors. Will that be to much injector for the SAFC to handle? I have been reading that alot of places.
If anyone is running 680's and has a good place to start as far as settings go please let me know. Any input will be appreciated.
thanks

 

[Team Addiction]

It can be done but you are going to need to keep a VERY close eye on where your timing ends up because of the amount of correction it will take. By default your going to have quite a bit of timing advance.
I dont recall the settings I had on my 660s but I do remember I was afraid to up the boost past about 18psi on my 16g. I think I got as much as 24degrees advance and got scared

 

[jeffo]

If you have an AFPR, drop your base fuel pressure to 35-37psi, to minimize the amount of airflow Hz you need to remove. You will probably also have to move your base timing back 1-2* to be able to run any decent amount of boost.

 

[JayRolla]

You have a 1g so you can pull timing with the CAS if needed. I did this when I was running 550's. I ran e85 on an safc, maf-t and 1200cc injectors. Since I was running around 30psi the ecu still was seeing enough airflow(10psi) to switch over to the high timing map in most situations. In your case you may have to run around 0-2* base timing if knock is an issue.

 

[91 TSi GP]

Ok well I still cant get my car to fire, I have never had this problem with past builds but then again I had dsmlink back then and now I have an SAFC and AFPR.
I have fuel, I have spark, and I have compression when doing a compression test. Is it possible that I'm getting to much fuel and it flooding out? 680 injectors..

 

[dsm-onster]

Pull off the safc and put backl in the stock injectors and see what happens.

You will need a maf upgrade for any turbo upgrade where you'll be flowing more air than what a 14b can do. In fact the 14b can overrun the stock 1g maf . You cannot run your gm maf with the safc.

 

[91 TSi GP]

Pull off the safc and put backl in the stock injectors and see what happens.

You will need a maf upgrade for any turbo upgrade where you'll be flowing more air than what a 14b can do. In fact the 14b can overrun the stock 1g maf . You cannot run your gm maf with the safc.

I unfortunaly do not have the stock injectors.. and I cant use the GM MAF?! could you please explain this a bit more. I'm new to the SAFC and am still a bit confused.
Thanks in advance!
Edit: these are my power related mods..
50 trim
Precision 680cc Injectors
255lph Fuel Pump
3" GM MAF w/ translator
Buscher FMIC
SSAutoCrome Manifold rewelded/ braced
Tial 38mm wastegate
Synapse BOV
4" Straight Exhaust
AEM UEGO wideband

Hmm so all morning I have been digging around and found the tuning guide for the MAFT so when I get home from work I'm going to zero out the SAFC and make sure the MAFT knobs are all set properly and try to start fresh.

 

[dsm-onster]

^^^That's a great start.

Nice to see you added "w/ translator" into your mod list. It wasn't added into your profile. Link doesn't need a maf translator to run the gm maf. Since you sold it, this is why I said you cant use an safc with a gm maf.

 

[91 TSi GP]

Ok well tonight I messed with the SAFC and MAFT settings and it didnt effect anything. I still have spark, I still have compression, I still have good fuel pressure at my AFPR, and my spark plugs are wet with gas when I pull them.
Now is where its interesting. I WILL NOT fire at all when normally trying to start I sperayed some starting fluid in the intake and bam it fired and died as soon as it burned the starting fluid. So it seems that my injectors are not firing properly. Hmmmm now what?!

 

[dsm-onster]

Injector plugs paired to the correct injector?

 

[91 TSi GP]

Today just for shits and giggles I decided to plug in an ECU I had in the garage from and Automatic 92 Talon N/A... and it fired up! WTF! I was just trying to see if it would even try to fire and it started and was idleing for a real long time. So needless to say my ECU magicly went bad on me..

 

[dsm-onster]

It hopefully ran very rich since n/t ecus run 270s. Otherwise, you still havn't found your problem

 

[jrohner]

It hopefully ran very rich since n/t ecus run 270s. Otherwise, you still havn't found your problem

but they also use a different airflow sensor.

 

[dsm-onster]

From what I understand, they meter about the same (same transfer function hz vs. volume flow) but they just don't have the signal reset. Which you wire in when swapping to the turbo ecu. There is no lower screen for the n/t piece which alters flow a little except for the lower section has two smaller tubes instead. But it's a good point. It would be interesting if nt/t guys could get away with turbo injectors with just a maf swap