 Overboosting!!! Help |
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 Nov 25 2006, 07:39 PM
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#1
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Person of Wisdom  Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399  |
14b (ported exhaust -- meaning where the turbo bolts to the manifold) It boosted up to 10lbs then holds but at 4000 to 4500 RPM at WOT the damn thing boost up to 20 to 23 lbs. OK the AVCR is not the problem. I have the line connected from the nipple on the jpipe to the wastegate. Yes I did a boost leak test and fixed all the leaks and the wastegate rod moves about 1/2in at about 13 lbs. With turbo on the car and the O2housing on the turbo. Took the turbo off and everthing looks fine. I am using a 2g 02 housing as well. My exhaust setup is a 3in downpipe to a 3/ 1/2 test pipe to the 4 in oulet. Also the exhaust side of the turbo has a white powder or film on it. Thought it maybe coolant leak Ran alittle bit of air thur the water lines and it does not leak air into the exhaust side. Any help would be great. Clutch is still giving me some problems but on thing at a time.
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Nov 25 2006, 10:34 PM
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#2
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
Sounds to me like boost creep. Not sure as to how to fix that one as you've already done the bigger exhaust. Maybe some of the other guys will have a suggestion.
-------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Nov 26 2006, 12:54 AM
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#3
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DSM Tech Wizard Group: Members Posts: 2,256 Joined: 10-January 01 From: central IL Member No.: 10 |
Porting out the wastegate and installing a larger flapper would fix the creep.
_Spy_ |
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Nov 26 2006, 01:20 AM
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#4
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Person of Wisdom Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399 |
I am getting 10lbs of boost creep?
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Nov 26 2006, 09:25 AM
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#5
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
When I last had the Talon running, I had it directly hooked up from J-pipe to the wastegate. I would get about 7-9lbs immediately but then a split second later, it would peg 18lbs. So yes, it's possible to creep 10lbs due to little or no porting on the exhaust side.
If money is not a problem right now, I'd go for an EVO 16G or if that's out of your range, try putting a 7cm exhaust housing with a bigger flapper on that 14B. You'll get a little more out of her and still have little to no creep -------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Nov 26 2006, 10:14 AM
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#6
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DSM Tech Wizard Group: Members Posts: 2,256 Joined: 10-January 01 From: central IL Member No.: 10 |
I've still got the exhaust housing that kicks used for his 12.6 runs, if you want to just swap the housings around... it's been ported such that it may very well get rid of your problem.
-------------------- The fastest car I own is a minivan....
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Nov 26 2006, 10:26 AM
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#7
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 DSMCentral Freak Group: Members Posts: 259 Joined: 6-February 04 From: Bloomington Member No.: 233 |
QUOTE (turbohcar @ Nov 25 2006, 11:34 PM) Sounds to me like boost creep. Not sure as to how to fix that one as you've already done the bigger exhaust. Maybe some of the other guys will have a suggestion. Kinda questionable on a stock motor, how about trying a MBC just to be 100% shure it's not the AVCR. Before I got my EVC IV figured out I had tons of problems. -------------------- Yeah!!!!!!!!!!! AND WASH THAT THING OFF BEFORE YOU COME BACK!!! GROSS
FP 3065, Ported 2G exahust manifold, AEM EMS, 3" 02 housing, Shepard Racing Stage 3 tranny, Fadinza 8 LB. flywheel, Exedy stage 2 tripple puck thick ceramic cluch, 08 from the tank to filter, -6 to rail from filter, Aeromotive FPR 1:1 riseing rate, Crower Stage 4's. All of that and I don't know what I want to do next. |
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Nov 26 2006, 03:07 PM
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#8
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 Eats and sleeps DSM jargin. Group: Members Posts: 1,985 Joined: 30-June 03 From: Peoria, IL Member No.: 150 |
with my old MBC I had about 5 psi of creep... with the kris 144 MBC I have completely eliminated creep... the trick is the hole drilled in the side of the MBC housing.
-------------------- You CAN sleep in your car, but your CAN NOT race your house!!!
------------------------------------------------------- Double Decker spoilers are uber ricerlicious!!!!  |
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Nov 26 2006, 03:28 PM
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#9
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 DSMCentral Freak Group: Members Posts: 352 Joined: 7-July 04 Member No.: 319 |
my evo3 doesnt creep.. it just snaps to 22psi right away.
during the summer it only hits 18psi |
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Nov 26 2006, 04:15 PM
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#10
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 Post Master Group: Members Posts: 986 Joined: 7-July 04 From: Central Illinois Member No.: 318 |
I was going to mention the MBC - if it disassembles and can be inspected it's worth a shot.
You mean my stock Evo VIII O2 housing's useful? -------------------- ... she likes bein' forced ...
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Nov 26 2006, 06:01 PM
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#11
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Person of Wisdom Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399 |
I do not have a MBC. I am using a AVCR. But right now I have the wastegate hooked up to the jpipe. So the car should be running under stock boost.
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Nov 26 2006, 06:12 PM
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#12
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
QUOTE (97TalonTSI @ Nov 26 2006, 06:01 PM) I do not have a MBC. I am using a AVCR. But right now I have the wastegate hooked up to the jpipe. So the car should be running under stock boost. Exactly. MBC or not it doesn't matter right now. He can't prevent it from creeping even when it's directly hooked to the wastegate. -------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Nov 26 2006, 09:56 PM
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#13
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Person of Wisdom Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399 |
JACK POT!!! I just have never heard of 10lbs of creep. I have band aided the problem for the time being by adjusting my BOV so it leaks at 10lbs.
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Nov 27 2006, 05:01 AM
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#14
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DSMCentral Freak Group: Members Posts: 352 Joined: 7-July 04 Member No.: 319 |
there is always the expensive solution... external wastegate
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Nov 27 2006, 08:31 AM
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#15
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 Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
QUOTE I'd use a hand pump to check your actuator if possible hook a pressure guage in parallel with it so you know at what pressure your actuator is... actuating. Like I said in the other thread, check your actuator. There could be a leak in the diaphragm causing the actuator to not fully open your wastegate. Also, in the future, please refrain from starting multiple threads about the same topic. |
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Nov 27 2006, 09:26 AM
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#16
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Person of Wisdom Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399 |
I did check the actuator. Also this is a diferent thread. The other one was about the AVCR. That is not the problem. People are more likely to view and read a thread on over boosting than one about a AVCR.
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Nov 27 2006, 10:49 AM
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#17
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Zen Master DSM Group: Moderators Posts: 3,008 Joined: 10-January 01 From: in front of you Member No.: 5 |
Ahh, missed the part in your original post about the rod moving with 13psi. Sorry about that.
I see where you are coming from, but in the future please ask a moderator to change the title of your thread if the topic has changed. As of right now both threads are essentially about overboosting. Its not a big deal, but we like to keep one thread per topic. That way it keeps us from having to merge two threads if both follow the same path on the same topic. |
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Nov 27 2006, 12:14 PM
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#18
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 Eats and sleeps DSM jargin. Group: Members Posts: 1,995 Joined: 27-November 04 From: Yates City IL Member No.: 389 |
QUOTE (97TalonTSI @ Nov 27 2006, 09:26 AM) I did check the actuator. Also this is a diferent thread. The other one was about the AVCR. That is not the problem. People are more likely to view and read a thread on over boosting than one about a AVCR. FYI...I think everybody on this board reads about every thread posted. -------------------- 92 Eagle Talon TSI AWD "The Black Golfball" How fast can a 14B go???
91 Chevy C1500 "Problem Child" **SOLD** 01 Impala DD 07 Trailblazer Wife's new DD Cars run on blood, sweat, and horsepower... Without the first two, you can't get the last" SOB Racing "Sitting On Blocks" |
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Nov 27 2006, 02:05 PM
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#19
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DSM Tech Wizard Group: Members Posts: 2,404 Joined: 16-December 03 From: Fletcher/Bloomington Member No.: 214 |
I try to read everything
-------------------- "I hear he tunes the space shuttle also...and that thing is fast"
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Nov 27 2006, 03:34 PM
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#20
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Person of Wisdom Group: Members Posts: 173 Joined: 22-December 04 From: Bloomington Member No.: 399 |
I hear ya! I will let you guys know the status as we look into this alittle more. I think I might over work the turbo with doing the BOV band aid. But all signs are pointing to a different turbo but I was not planning on that until the spring.
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