ct 26 questions
- Thread starter allen600
- Start date
allen600;1656407 said:
http://www.supraforums.com/forum/showthread.php?152334-Newbie-s-guide-to-Modifying-your-MK3-turbo
This is a pretty good thread to read. You might also want to check out some of other the sticky under the MK3 FAQs section.
If you have a stock afm on, just play with the boost until you hit fuel cut, then dial it down a notch so that you don't hit it when you go under WOT. Fuel cut will vary depending on your altitude, mods, and environment temperature. Typically, with these in mind, I've seen and had everything 8 and 14psi on stock afm. Which is why its good to just play with it until you're happy.
When you get the lex afm, fuel pump, afpr & 550's, you need to be a little more careful. You'll still have fuel cut protecting you...to a degree...
A few things to keep in mind:
1) make sure you get the supporting mods if you get a lex afm. The most common is: headwork (gasket and/or bolts with proper torque) 550 injectors, fuel pressure regulator, fuel pump upgrade, and most importantly a wideband to monitor your a/f ratio.
2) Fuel cut does exist, but you can still damage your motor even with it with the lex afm...which is why you want the wideband...
3) If you need a comparison (which is not ideal because I have a 50 trim ct26): With the Lex AFM I saw fuel cut at 18psi on my 50 trim ct26 and 10 a/f ratio with base fuel pressure at 28 and the screw all the way out...after some playing around and getting some suggestions, i pulled the boost back to just under 15psi atm and 10.8 to 11 a/f with no tune..and it seems to have the same power as if I were running 18psi...so the point is you don't always get more power by overboosting the turbo...it loses efficiency at a point...and is putting you in the danger zone more...
Do your research, do the right thing, and Goodluck!
When you get the lex afm, fuel pump, afpr & 550's, you need to be a little more careful. You'll still have fuel cut protecting you...to a degree...
A few things to keep in mind:
1) make sure you get the supporting mods if you get a lex afm. The most common is: headwork (gasket and/or bolts with proper torque) 550 injectors, fuel pressure regulator, fuel pump upgrade, and most importantly a wideband to monitor your a/f ratio.
2) Fuel cut does exist, but you can still damage your motor even with it with the lex afm...which is why you want the wideband...
3) If you need a comparison (which is not ideal because I have a 50 trim ct26): With the Lex AFM I saw fuel cut at 18psi on my 50 trim ct26 and 10 a/f ratio with base fuel pressure at 28 and the screw all the way out...after some playing around and getting some suggestions, i pulled the boost back to just under 15psi atm and 10.8 to 11 a/f with no tune..and it seems to have the same power as if I were running 18psi...so the point is you don't always get more power by overboosting the turbo...it loses efficiency at a point...and is putting you in the danger zone more...
Do your research, do the right thing, and Goodluck!