EVO III 16g into a 2nd gen

[Fabian972]

Okay my T -25 is about to bit the big one. I'm gonna replace it with the Evo III 16g do I need to upgrade the fuel system or can i run it at stock psi on my stock fuel sytem?

fo life

 

[kenamond]

Okay my T -25 is about to bit the big one. I'm gonna replace it with the Evo III 16g do I need to upgrade the fuel system or can i run it at stock psi on my stock fuel sytem?

You can run stock fuel depending on how high you intend on boosting, but if you push the boost too high (presuming you have all other supporting mods), you'll eventually reach the duty cycle limit of your stock injectors and hit fuel cut. At that point, you either back off the boost or upgrade your fuel system including some sort of fuel control. You can also rewire your fuel pump to get a bit more out of the stockers.

Consider porting your evo3 and 2g mani as part of the install if you intend on upgrading your exhaust in the future. Read the tech article called "How to cure creep by porting" or something similar to find out more about why to port and how to do it.

Good luck!

 

[-DSM2NR-]

you can run it on stock fuel but it's only good for 15psi max. If you want to run more than 15psi get either a 190fuel pump or an 255fuel pump and bigger injectors.

 

[GSTBlack95]

really? 15? are you sure on that one? Everyone cries bloody murder at 11 or more....I mean heck if your right thats cool, I just didnt know that, I figured the flow is about twice that of a t-25 at 250 cfm, if I remember the evo is 550cfm....

 

[97_eclipse_gst]

Thats correct the evo 3 16g is rated at 550 cfm, and the stock boost for a 2g is 14.1 so 15 lbs should be fine. But you will definitely need bigger injectors and fuel pump to raise boost and get the most power of the turbo. PLus it would be a good idea to start saving for some kind of engine management. Such as a air to fuel controller, piggyback, etc but the best way to go is with dsm-link. Good luck

 

[R-U-QUIKR]

I'm running a Evo 3 and I can't go over 11lbs on the stock system with out hittng fuel cut.

 

[kenamond]

really? 15? are you sure on that one? Everyone cries bloody murder at 11 or more....I mean heck if your right thats cool, I just didnt know that, I figured the flow is about twice that of a t-25 at 250 cfm, if I remember the evo is 550cfm....

If the T25 and evo3 are roughly equal efficiency at 11psi boost, you'll push the same air charge into the motor (very similar flow rates, because it's the same engine displacement and rpm range). I don't know what the efficiencies are, but I expect that the T25 is probably on its island at 11, and I'd expect that the evo3 may be at a lower PR at 11psi than its peak, so it'd probably run as hot or hotter than the T25 there. Someone could tell quickly with both compressor maps in front of them. Hopefully, I'm not full of it.

 

[Fabian972]

Thanks guys that is what i thought my buddy kept saying you have to upgrade your fuel system or it won't run right dumb nissan guy in there dumb 240's 4G63 power baby

 

[GSTBlack95]

I would like a little more info on this.....if anyone has any more...I know the evo is way out of its efficancy range on power at the low lvl of boost..the t25 is good up to 16.

aye to much thinking for my head right now.

 

[kenamond]

I would like a little more info on this.....if anyone has any more...I know the evo is way out of its efficancy range on power at the low lvl of boost..the t25 is good up to 16.

aye to much thinking for my head right now.

That sounds reasonable. But if the evo3 is inefficient at 11psi, then you'll get a hotter air charge and therefore less air than a T25 which is more efficient at 11psi (and same flow rate) , so fuel cut wouldn't seem to be an issue. I know that running too high a PR/boost for one compressor will result in much hotter compressed air than a more efficient compressor would produce at that same PR/boost, and I'm assuming it's the same if you're too low, though it doesn't fall off a cliff like up top. In otherwords, I'm assuming that when you go down in efficiency, the outlet air temperatures are artificially higher (more entropy) than at a higher efficiency regardless of whether that is up or down in PR. And that shouldn't lead to fuel cut. Knock, maybe (doubtful), but not fuel cut.

 

[GSTBlack95]

I could very well see your reasoning in that, I might need to find the maps for them to get a better understanding of it all.

Would anyone happen to have that?

 

[kenamond]

I could very well see your reasoning in that, I might need to find the maps for them to get a better understanding of it all.

Would anyone happen to have that?

Might be here.

What compressor is on an evo3? I was looking for a map for my B28, but I don't know what compressor it has either (FP didn't answer my emails ). And I don't know what the T25 compressor is, either. I hyperlinked to a compressor map on FP's website through a forum post one day, but I couldn't find any maps by searching, so I know they have them, but don't know how to find them (email didn't work, search didn't work).

If you know, I'd like that info so that I can get ahold of a map for my B28. I keep thinking of searching on the forum, but I haven't yet.

 

[2gGSX]

I'm assuming you haven't removed fuel cut, which will prove to be a godsend. For a majority of people (even those who port the wastegate flapper area, which is supposedly the correct way to fix creep) the turbo will creep no matter what at high RPM. I'm telling you now, the stock fuel system is nowhere near up to par for that turbo when it really starts to flow air (~27-30 lbs/min).

My advice to you would be to very careful in how you drive it. With all safety measures removed, that turbo can easily outflow your stock fuel system and grenade your engine.

As for flow maps..
DSM T25 (via http://66.102.7.104/search?q=cache:...t+dsm+t25+flow+map&hl=en&gl=us&ct=clnk&cd=1); http://img33.imageshack.us/my.php?image=t2560trim2kw.gif
T28 (or very close anyways); http://www.stealth316.com/images/gt28rs-62trim-raw.gif
Evo III; http://linux.forcedperformance.net/merchant2/graphics/00000001/full/evo_ti_map_full.jpg