2G Evo VIII Injectors?

[jrpmp69]

What size are the stock injectors on an 2005 Evo VIII? Will they fit a 2g 4g63t? Are they a direct replacement or would I need to modify anything?

I can get a set of them really cheap from an Evo guy that is upgrading.

 

[DSMunknown]

What size are the stock injectors on an 2005 Evo VIII? Will they fit a 2g 4g63t? Are they a direct replacement or would I need to modify anything?

I can get a set of them really cheap from an Evo guy that is upgrading.

They are 560cc injectors.



According to this site, that is (scroll down to "Uprgrade Fuel Inectors" section):
http://www.roadraceengineering.com/evo.htm

And this site says the same thing:
http://www.roadraceengineering.com/evo/scc-mrstg1.htm



You should be fine if you're looking for a cheap and fast upgrade, but depending on your goals, you will probably want to upgrade those Evo injectors sometime down the road. So why not upgrade to a decent size the first time around?

 

[diablos991]

They are 560cc and yes they are a direct bolt on. They are also a common upgrade.

The search button will yield more information.

 

[Kevin Jewer]

The EVO injectors act like 580s, not 560s. I'm not sure where the info came from, if they have been flow tested, etc. I have run a 2g ECU with DSMlink in my EVO and they act like 580s. The DSMlink guys said this initially, and I tried to prove them wrong and couldn't do it. Take that for whatever it's worth.

You can install any EVO injctor (stock or aftermarket) in a DSM, but you can't install a DSM type injector in an EVO without modifying the end of it.

 

[RockSolidGST]

*I just put evo8 Injectors in my car , "560's" heard they flow Closer to 600 , They Perform great , Had to take away 2-3 more points of fuel on the safc accross the board to get the fuel trims right on low throt , So they def flow more then 550's
Picked them up for 100$!

 

[larsrya8]

The reason the Evo8 injectors flow more than they are rated when installed in a DSM is because they have "negative deadtime." The Evo injectors open faster than the stock DSM injectors, so the ECU is overcompensating.

 

[DSMunknown]

The reason the Evo8 injectors flow more than they are rated when installed in a DSM is because they have "negative deadtime." The Evo injectors open faster than the stock DSM injectors, so the ECU is overcompensating.

Ryan, I'm just curious if there is a link you can show us that corroborates this information. It would be much appreicated if there was one (or two or three ).

 

[larsrya8]

Ryan, I'm just curious if there is a link you can show us that corroborates this information. It would be much appreicated if there was one (or two or three ).

It's all over the DSMLink forums, since you can make deadtime adjustments with DSMLink. Linking won't work unless you have an account.

 

[pneumo]

I can vouch for this. Info posted on the DSM-ECU list shows a deadtime correction factor of -180 microseconds for EVO VIII injectors.

 

[Kevin Jewer]

That's an interesting bit of info. It's no wonder myDSMlinked EVO ran a little better with the EVO specific settings than the DSM chip. Or perhaps Tom never moved that over to the EVO chip and it was due to some other change... Now I'll have to ask him.

 

[DSMunknown]

It's all over the DSMLink forums, since you can make deadtime adjustments with DSMLink. Linking won't work unless you have an account.

I will look for this information when I get the program hopefully sometime within the next year.

I can vouch for this. Info posted on the DSM-ECU list shows a deadtime correction factor of -180 microseconds for EVO VIII injectors.

So what is the cause of this dead time? Does this mean that the EVO VIII injectors are superior to, say, the Precision disc-style 550cc injectors or the Precision ball-style 580cc injectors? If so, why are they superior? If the EVO VIII injectors are very similar to the ball-style 580s, what makes them similar?






EDIT: I found this:


http://www.motec.com/definitions.htm

Injector Dead Time - Injector dead time refers to the latency of the injector in producing maximum flow rate. All injectors require a certain amount of time to open completely and produce maximum flow. The amount of time is dependant on several variables including; fuel pressure, battery voltage and physical characteristics of the injectors themselves. Typically higher fuel pressure or lower battery voltage tends to increase the dead time. This leads to a reduction in fuel flow in to the engine and as a result influences the engine's state of tune. Luckily MoTeC allows the user to define an injector Dead Time table if the values are known, or use a standard compensation which is known for a number of injectors. The ECU automatically adjusts the values as the battery voltage changes to ensure that the fuel curve remains constant. If a fuel pressure input is used on the system, MoTeC can compensate for variations in fuel pressure to achieve a consistent fueling even with varying fuel pressures.

edit X2: A few other links that pertain to this:


http://www.3si.org/plhelp/injdutycycle.html
http://www.motec.com/products/ecu/tutorial.htm
http://users.wpi.edu/~ktarry/EPROM/features.html
http://users.wpi.edu/~ktarry/dsmtech/dsmromedit.html

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http://www.dsmchips.com/faq.asp?A=8
http://www.dsmlink.com/details-fuel.html
http://scitation.aip.org/getabs/ser...00126000004000781000001&idtype=cvips&gifs=yes
http://www.openecu.org/index.php?title=Injectors
http://www.zal.tu-cottbus.de/zal/prakt/gaschrom.htm
http://epaper.kek.jp/p83/PDF/PAC1983_2022.PDF