Largest injector size on stock ecu?

[v8s_are_slow]

Wondering what the largest size injector is that anyone's had on a stock ecu. No chip or anything of that nature. I'm dying to get my T-67 turbo back on but wondering what size injectors I'd be safe to use on it with the ecu being stock. I'm sure people have done it. Wondering what side effects I'd have if any. Feedback? Thanks.

 

[95 gsx]

It depends what ecu you have. 450cc for e/t/l 1g mt and all 2g, 380cc for e/t/l 1g at,
510cc for evo III, I hope you dont plan on putting bigger injectors in your car without anything to tune them with and I dont think anyone else would. That would be half-assed.

 

[drewvr4]

550s

 

[v8s_are_slow]

I've been tuning with a maft and wideband. I've been 7.7 in the 1/8th with an Evo 16g so far with 550cc's but it's not fast enough for me. Thinking along the lines of 1000cc injectors with the T-67. Not sure how the ecu will react to it though (could always get a chip to compensate for the deadtime but for now let's pretend I don't have one just for giggles).

 

[steve]

Since your tuning with the MAFT, how far they do they provide setting for?

I'll assume that you have done your homework and read enough to understand that any external compensation for changes in injector size involve messing with the airflow measurement and have secondary impact to ignition times because of the changes to perceived engine load.

Given that the rest of your question is academic. The correct answer for how you worded it is the largest injector safe to use on a stock ECU is the stock size.

With the correct software changes via a chip or DSMLink today is likely the 1600cc injectors. The largest with a SAFC or MAFT depends on how the car reacts but generally it's around 650/680cc before the timing gets too advanced.

 

[DGajre777]

What ^^^ said.

To answer you question - stock. You can't have bigger injectors and have no way of controlling them. A chip for your car with injector and deadtime compensation would run you about $140. That's cheap considering you'll have to pay a lot more for injectors and an AFPR with a big fuel pump.

As for the chip - KEYDIVER Chips - DSM ECU Tuning

 

[v8s_are_slow]

Well that's obvious. Lol. But you know people run larger than stock all the time with no ill effects (that are noticable anyway). Main reason why I'm asking is because I wanna be able to get the dang turbo on the car so it can be driven. Of course I'll probably end up getting the chip until I can get dsmlink but just wondering if I'm gonna be having any major issues.

 

[v8s_are_slow]

I'm thinkin of maybe going with some 880's if they'd be large enough for a turbo of that size.

 

[steve]

Well that's obvious. Lol. But you know people run larger than stock all the time with no ill effects (that are noticable anyway).

Not without some form of tuning to correct for the change.

 

[BringBackDSM]

Are you saying you want to run bigger injectors without compensatng for them?

 

[DGajre777]

I'm thinkin of maybe going with some 880's if they'd be large enough for a turbo of that size.

Get the biggest injectors that you can get that work with a chip and DSMLink, in this case it would be 1000cc injectors. It is better to run low IDCs, instead of running high IDCs and then having to buy another set of bigger injectors.

 

[pneumo]

It's well known that using a piggyback to compensate for large injectors leads to high timing, so why not simply rotate the CAS and pull out a few degrees? It's not perfect, but it's close enough for a DSM'er!

 

[BGRIPTP]

Get the biggest injectors that you can get that work with a chip and DSMLink, in this case it would be 1000cc injectors. It is better to run low IDCs, instead of running high IDCs and then having to buy another set of bigger injectors.

You can run 1600cc injectors with the Link, it might just take some tweaking. I would not reccomend trying to use it as a DD tho.

 

[DSM90AWD]

It's well known that using a piggyback to compensate for large injectors leads to high timing, so why not simply rotate the CAS and pull out a few degrees? It's not perfect, but it's close enough for a DSM'er!

You could to a degree, but as you can see below, removign too much airflow can put you in a world of hurt w.r.t. timing (courtesy Kyle Tarry):