2G 20g supporting mods

[megst98]

i have a 2g eclipse and i'm probably gonna be upgrading my turbo within the near future..
i have exhaust mani w/ 38mm wastegate opening, o2 housing w/dump (but i can take the dump tube off to run the wastegate), down pipe, test pipe and catback...

i was looking at getting a 20g because i think it would bolt right up to my existing setup.

can anyone help me as of what size injectors, pump, afpr, and tuning device..

i was thinking 660's and a 255 walbro pump.. with the firewall mounted afpr and the afc-II... but i think i need some sort of logging system.. if anyone can help that would be greatt...

 

[crunchymilk]

Check out DSMLink if you haven't already. It's about the cost of an SAFC2 and a logger, but it does 100x more. www.dsmlink.com

A 20g is a good choice, it's been proven over and over, but also check out the vast selection of "50 trim" turbos that are on the DSM market. Either of these turbos will spool fully by 4k, which is great for a street car. However, since you're FWD, I would also look into some mods that will get you some traction (LSD, tires, solid mounts) etc.

 

[2gGSX]

If you're going to try to max out the 20g, I'd recommend at the very least 720cc Denso's. If I were you I'd start looking at the 850cc/min + injectors. To complement any of these injectors I would get a Walbro 255HP rewired with an AFPR.

The basis of this is that if you run say 30 lbs of boost (73 psi fuel pressure) your pump will flow a maximum of 219 lph, or 3650 cc/min. At 95% of this you'll support 866 cc/min on each injector. With this I would recommend 850 cc/min injectors (850 * .9 = 765 which complements your pump flow). With ~750 cc/min of flow at 30 psi you'll be able to support 5.02 lbs/min of fuel flow which will be enough to support 55 lbs/min of airflow at 11:1 and pump gas specific gravity of .76 which is more than a 20g can feasibly support.

If you have any inclination that you'll upgrade to something even bigger (60+ lbs/min airflow) then I would recommend using 950cc injectors (855 cc/min at 90% IDC) which will get you 5.725 lbs/min fuel flow (supporting 63 lbs/min airflow at 11:1 and .76 specific gravity).

With injectors of this size you'll basically be forced to go the EPROM route of a chip/AFC or DSMLink.

As far as AFPR's, I would look at the www.importevolution.com special of the 255 hp and AFPR combo for 275. It comes with a proven Aeromotive AFPR and is a great cost.

Let me know if you have any more questions.

 

[fourreGsixty3]

To compliment the 20G I would say 660s will be fine but listen to ^^^ he seems to have a good grasp on injectors, skip the SAFC II and go to the DSMLink with logger, with SAFCs it gets hard to tune 660s+ if you dont have a great understanding for it. Rewire the wally 255, get an AFPR, and a MBC, with a boost guage and a BOV to handle the lbs you will be running with out leaking.

 

[2gGSX]

The reason why I say get larger injectors than 660 cc injectors is because I'm not fully sure what 20g you'll end up going with eventually. I see that in your profile you listed you're looking at the TD05H 20g as opposed to the TD06H variant. With the TD06H variant's flow map (http://www.stealth316.com/images/td06h-20g-cfm.gif) I was assuming your peak airflow would be close to 50 lb/min which is my reasoning behind suggesting larger than 660cc injectors. With the smaller 20g I've only heard mid 40 lb/min airflow, for which you will definitely strain 660cc injectors but it is still possible.

With 660cc injectors you may be able to slip by with just the SAFC/Logger path but I would highly recommend against that due to the 20g not being particularly efficient, so with the extra timing you will undoubtedly be limited to pump gas. If you plan on flowing low numbers for street driving then by all means this may work out, however regardless you will still get high timing values due to the large compensation necessary.

Beyond 660cc injectors you will basically be forced to use a chip or DSMLink to compensate.

 

[DGajre777]

To compliment the 20G I would say 660s will be fine but listen to ^^^ he seems to have a good grasp on injectors, skip the SAFC II and go to the DSMLink with logger, with SAFCs it gets hard to tune 660s+ if you dont have a great understanding for it. Rewire the wally 255, get an AFPR, and a MBC, with a boost guage and a BOV to handle the lbs you will be running with out leaking.

Why does he need DSMlink WITH a logger? http://www.dsmlink.com/details-datalog.html