slower w/afc and 660s

[droptopgst]

Whats the deal here? I just put on the TDO5 18g that wont stop boosting, ported the he!! outta the mani. and 02 then installed the afc and 660s to get what????? A slower car than I started with!!!! YES nothing like wasteing $$$ If anyone has any clue with this set up please let me know. if not i am going to yank everything off and put the ol t25 back on at least there I was running high 14s instead of well I would guess 16s now.

 

[candela]

:laugh:

Someone needs to do a little tuning You cant just slap it in and expect better results

 

[droptopgst]

tried cant tune until I get this out of control boost problem fixed. (boost creeps to 25+ psi) One of the turbo techs said afc and 660s would fix that boost problem so there it is and made no difference.

 

[HiPsiTsiMike]

HAHAHAHHAHAHAHAHA learn how to tune an AFC

 

[Ben K]

Originally posted by droptopgst
tried cant tune until I get this out of control boost problem fixed. (boost creeps to 25+ psi) One of the turbo techs said afc and 660s would fix that boost problem so there it is and made no difference.

What turbo tech told you that fuel control will fix a boost creep problem?

 

[eyebrowski]

hmm, you shouldn't still be creeping that bad on a ported 02. do you have all your vacum lines conected to your wastegate properly? im assuming you are using an internal gate, have you ported it yet?

 

[jdmawd]

i bet his boost controller is hooked up backwards or his wastegate actuator is not working properly.

 

[asian312]

Fuel is not part of the equation of controlling boost, unless u detune your car soo much that it no longer produces enough exhaust gas to spin your turbine.

Check your MBC/EBC for proper connection. Then back the knob or set it to release at the stock wastegate setting (normally 10 or 15 on internally gated setups). If the boost still climbs then it's your wastegate or actuator arm. Unscrew the arm a turn at a time and retest. If this doesn't solve it, then your wastegate is shot.

Anther solution after catching up on your other thread. If the wastgate is opening at 12 psi then check the flapper and O2 for obstruction. How did u check this? While driving? Would it only boost to 12 psi? Are there any kinks in the input/outut lines to your MBC?

Remember also to adjust your MBC slowly (like 1/8 turns at a time). Backed out all the way it should only boost to ~12 psi. When u start to tighten the knob it won't register until the MBC overcomes the input pressure, and then the boost levels will start to rise very rapidly.

 

[red91gst]

Did you have the turbo manufacturer install a larger flapper door? If not, port it yourself, most boost creep is from a big turbo, trying to run low boost, with a small wastegate passage.

 

[droptopgst]

Fuel is not part of the equation of controlling boost,

I didnt think so either but i tried everything else so i figured i would give that a try

Check your MBC/EBC for proper connection. Then back the knob or set it to release at the stock wastegate setting (normally 10 or 15 on internally gated setups). If the boost still climbs then it's your wastegate or actuator arm. Unscrew the arm a turn at a time and retest.

did all that, i even bought a new b/c. hell i even bypassed the b/c and ran the line from the turbo to the actuator. Turned the arm out, and it jsut made the car slower.

i bet his boost controller is hooked up backwards or his wastegate actuator is not working properly

it is hooked up the right way and it is working properly

do you have all your vacum lines conected to your wastegate properly? im assuming you are using an internal gate, have you ported it yet?

yeah, all new and connections, it is an internal gate, the turbo was ported by them and i ported the mani. and O2

 

[eyebrowski]

if it is all hooked up correctly something is broken. actuator maybe.

 

[asian312]

Ok one thing at a time.

When u hooked the line directly to the wastegate, did it open at the set psi (12 I believe in your case)?

If yes, then something is fishy with your MBC.

If no, then something is wrong with the wastegate and arm.

Next try hooking up the MBC and unscrewing the knob out all the way. Did it boost to 12 psi?

If yes, then it's your adjustment technique. Turn the boost up really slowly.

If no, then your lines are messed up or possibly backwards. Where is boost source for the MBC?

Answer these and we'll continue from there

 

[droptopgst]

When u hooked the line directly to the wastegate, did it open at the set psi (12 I believe in your case)?

Ok To test the actuator I hooked a line from an air compressor to the actuator and the arm moved(it opened) at 12psi.

I tried to hook up 2 diff. mbc and even eliminate the b/c all together by running a hose from the turbo nipple to the actuator.

I read the directions of the b/c over and over again I know I Have it on the the right way. The first b/c was a turbonetics and the second one was a hallman.

At around 3,000 rpms or so my boost jumps to 12psi (what the actuator is set at) and then holds at that until about 5,500 rpms where it creeps really fast to 20+psi and keeps going until i let off the gas or until it hits fuel cut.


could it be poss. that i need to port out the O2 even more and put a bigger w/g hole in there?

how about running higher boost? if i do this say set my boost to like 19 psi do you think it will be alright and not creep since it is starting at a higher psi than 12?

 

[Thalomos]

My car is a 1st gen, so this could be different...... but here's what happened with my car.. and in your profile you have an "intake" listed as a mod.. so here goes....

I put the 3" Intake on the car, and suddenly the car was boosting 20+ psi no matter what, with nothing else changed... (was holding at 15psi fine before the intake)

We found out the 3" intake was pinching the vac line running to the wastegate... so we took the intake off, pulled the rubber vac line off, and bent the metal tube coming off the wastegate down some.. so the intake wasn't pinching it... and all was well.

I hope this helps.. if not, ah well. :/