1G Changing Injectors and fuel pump?

[Hunts_13]

Hey guys

Car is a 90 TSi AWD with big 16g turbo and turbo back exhaust. So I just got my Evo 8 injectors and Walbro 190 fuel pump in and am just waiting on my Apexi SAFC. (1 week away).

My question is if I put my fuel pump and injectors in now before my SAFC is going to hurt anything? Any idea how rich I'll be running.

 

[RadDsm]

The fuel pump won't, but the injectors will. Just wait until you have a way to compensate for the injectors.

 

[Hunts_13]

alright thanks man

 

[Chaosweaver]

The injectors wont technically hurt anything, just will cause you to run a bit rich. Also make sure to have something to data log so you can tune, if not you run the chance of tuning too lean and having some major issues.

I would follow RadDSM's advice though, just wait it out until you can get everything set.

 

[RadDsm]

The injectors wont technically hurt anything, just will cause you to run a bit rich. Also make sure to have something to data log so you can tune, if not you run the chance of tuning too lean and having some major issues.

I guess if you don't consider the risk of washing down the cylinder walls "hurting anything" then you are right.

It would certainly be a shame to see the excess fuel make it past the pistons to mix it's way into the oil, causing a spun rod bearing or other issues.

You make a good point on the logger which I didn't mention. OP- make sure you have a logger and a wbo2 before you put the injectors/safc in. You need a way to monitor what your engine is doing and your AFRs.

 

[dsmTripp]

Not to hijack the thread but I have similar situation. Got a Walbro 255 already installed along with my SAFC II and AEM wideband. My wideband shows I'm already running rich and soon I will be installing my PTE 680 injectors.

Will I be good to go as far as being able to tune?

 

[RadDsm]

Not to hijack the thread but I have similar situation. Got a Walbro 255 already installed along with my SAFC II and AEM wideband. My wideband shows I'm already running rich and soon I will be installing my PTE 680 injectors.

Will I be good to go as far as being able to tune?

If you have a logger, then yes. You are probably over running your stock FPR, it would be a good idea to pick up an AFPR before going much further with that 255.

 

[Chaosweaver]

I guess if you don't consider the risk of washing down the cylinder walls "hurting anything" then you are right.

It would certainly be a shame to see the excess fuel make it past the pistons to mix it's way into the oil, causing a spun rod bearing or other issues.

You make a good point on the logger which I didn't mention. OP- make sure you have a logger and a wbo2 before you put the injectors/safc in. You need a way to monitor what your engine is doing and your AFRs.

You do have to keep in mind that they're 540s (which are 10-15% bigger than stock if I recall), so the amount of fuel added by them isn't enough to damage anything on the short run (he said he was 1 week from getting the SAFC). If they were 660's (which are over 40% bigger) then I would wait for the SAFC and the logger to tune.

I maybe wrong, I don't know. It all depends on if people take risks, I've been known to and tend to pay for it a lot .

 

[EclipticalGS]

just wait, 540's untuned will make your car run like dogshit, and burn a shit ton of gas..just wait.

 

[Badgst96]

I wouldn't run or tune anything without a wideband/logging device, your just going to be tuning in the dark and run into problems.

I believe the Evo injectors are 560cc but I have seen threads (on this site) saying they been flow tested and they flow like 580cc-590cc some even more. Those injectors will work perfectly with the SAFC, any bigger and you might need to use a different tuning device.

Rewire that pump for constant voltage and get a wideband and you are set depending on what your plans are for boost.

 

[Chaosweaver]

I wouldn't run or tune anything without a wideband/logging device, your just going to be tuning in the dark and run into problems.

I believe the Evo injectors are 560cc but I have seen threads (on this site) saying they been flow tested and they flow like 580cc-590cc some even more. Those injectors will work perfectly with the SAFC, any bigger and you might need to use a different tuning device.

Rewire that pump for constant voltage and get a wideband and you are set depending on what your plans are for boost.

Anything up to around 720s will work well with an SAFC (even though I wouldn't suggest past 680s with an SAFC for safety reasons), anything bigger will need DSMLink or better.

 

[Carter_95RS]

I would rather wait a week than possibly damage my engine by washing down my cylinder walls. A week isn't a long wait