Something Wrong Here?
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Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Something Wrong Here?
For the life of me, i cannot get my truck to make over 25 PSI of boost. tonight coming home from town, turned the **** to "140", i locked the TC in 3 (drive, 1:1) and rolled on the throttle until it was matted. let off at 75mph/3000RPM (scared of PMR carnage) and i kept a keen eye on the boost gauge, and it would not go past 25. it shot from 5-20 very rapidly, and then took a long (relative) time to make the last 5 pounds. i think this may be a fuel problem. i have a Kwik filter in good condition, only about 5000 miles on it. do you think it can be a turbo problem? it needs rebuilt, as it only takes 4-5 seconds to stop spinning after a shutdown. luckily for me i have everything to rebuild it.
please come through again for me FTE!
please come through again for me FTE!
Elder User
Joined: Jul 2005
Posts: 533
Likes: 0
From: NorCal
Curious of EGTs as well, that may indicate if you have a turbo prob or not. You have your boost readings from your AIH delete correct? Mine will shoot to 25-27 psi after 2k RPMs very easily on the 120 setting.
Posting Guru
Joined: Jan 2006
Posts: 1,605
Likes: 1
From: Elkhorn, WI
maybe your wastegate is opening letting boost escape. dont you have a relief valve in your map line? if the valves on the relief open and your tee for the boost guage is in the map line wont the guage read the same thing as the computer sees? i get mine to about 23 unloaded but i have a constant 90 hp chip and i dont have a relief valve so 25 doesnt sound that bad unless with ts chips it is suppossed to be higher
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Post Fiend
Joined: Jul 2005
Posts: 14,582
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From: 21791
EGT's were right about 900-1000*, although i didnt have too close of an eye on it. i find it very hard to get EGT's over 1050. pulling a hill in OD about 55mph i could only get EGT's to 1050*, and ive never had it above 1100* EVER before. however i did glance at it once or twice while WOT. boots are clean and tight. i can tighten them up tomorrow and make another run.
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Post Fiend
Joined: Jul 2005
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From: 21791
Originally Posted by Muktown
maybe your wastegate is opening letting boost escape. dont you have a relief valve in your map line? if the valves on the relief open and your tee for the boost guage is in the map line wont the guage read the same thing as the computer sees? i get mine to about 23 unloaded but i have a constant 90 hp chip and i dont have a relief valve so 25 doesnt sound that bad unless with ts chips it is suppossed to be higher
Posting Guru
Joined: Jan 2006
Posts: 1,605
Likes: 1
From: Elkhorn, WI
ya i was thinking if it was close and some boost escaped it would go right past your boost guage tube
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Elder User
Joined: Jul 2005
Posts: 533
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From: NorCal
Originally Posted by strokin_it7.3
wastegate unplugged (soon to be gone) and i do have a relief valve. however i did trigger the SES light as soon as i got to 25psi, but it still held 25 and wouldn't budge.
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Postmaster
Joined: Nov 2003
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From: Utah County, UT
Yes and no, a releif valve will pulsate, ex. takes 25 to open, then closes at say 20, then opens at 25, the closes, back and forth type thing. A regulator is constanly adjusting to maintain what ever the set point is. Spring diaphram tension to open or close needle valve basiscally (maybe not so basic if you don't know). Obviously, a regulator is much more desirable.
I can make 27 with my PRE99 turbo without any boost eliminators and such, it does trip the light though.
EDIT: Was looking through your gallery strokin, thought you had a wicked wheel? didn't see it listed. I wonder if the wicked or equivelent can produce a higher peak boost? Mine has essentially a wicked wheel from stock, but also has a smaller turbine inlet.
I can make 27 with my PRE99 turbo without any boost eliminators and such, it does trip the light though.
EDIT: Was looking through your gallery strokin, thought you had a wicked wheel? didn't see it listed. I wonder if the wicked or equivelent can produce a higher peak boost? Mine has essentially a wicked wheel from stock, but also has a smaller turbine inlet.
Last edited by cangim; Mar 26, 2006 at 09:06 AM.
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Post Fiend
Joined: Jul 2005
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From: 21791
11th mod down= wicked wheel. i wouldn't give it for the world. well maybe for a BTS but then i'd buy another one to put back in. i do want the ATS housing now, i want that screeching sound.
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
Perhaps the relief valve was sticking? Mine (when I had one) would stick, especially in the cold. SES light every time. Glad to hear you're finally making the move to the regulator. 
I been waiting for you to finally do that. 
I been waiting for you to finally do that.
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Post Fiend
Joined: Jul 2005
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From: 21791
Lead Driver
Joined: Oct 2004
Posts: 7,413
Likes: 1
From: Columbia, MO
I saw that a few months back. It all made sense to me, and that was one of the main reasons that I switched from the relief valve to a regulator. Then I did some checking here on FTE to verify their claims, and promptly ordered one the next day. That's why I've been pushing the regulator over a relief valve for someone to eliminate the overboost code.