Turbo M7 wont hold boost

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02DOO

Free Member

Nov 26, 2007

90

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• Jan 20, 2008

• #1

Well this has been givin me some grief...I can only get 4psi of boost under load. I checked the air box for leaks, put gooves on the t-bodies to make sure the hoses stayed on, did the extra springs and gasket goop on the exahust...whats the deal, its an aerocharged m7..Any thoughts???

 

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speeddemon

Well-known member

Feb 27, 2006

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buckley wa

• Jan 20, 2008

• #2

02DOO said:

Well this has been givin me some grief...I can only get 4psi of boost under load. I checked the air box for leaks, put gooves on the t-bodies to make sure the hoses stayed on, did the extra springs and gasket goop on the exahust...whats the deal, its an aerocharged m7..Any thoughts???

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some areos are made for low boost . did u buy it new in a kit or used !!! i thought u where a home built kit !!! when ordered i guess they put in what boost level ur gonna run !! have u had it past 4 psi before ? lil more info!! sounds like u have checked for leaks !! do u have a BOV? is ur exhaust free flowing and ur intake ?
mike

 

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speeddemon

Well-known member

Feb 27, 2006

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buckley wa

• Jan 20, 2008

• #3

bigbull was haveing kinda the same issue !! he could make boost till he put a good load on it then it went south . he has been trying some clutching , maybe pm him for some help as well
mike

 

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02DOO

Free Member

Nov 26, 2007

90

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• Jan 20, 2008

• #4

the wastegate is set at 8spi, did the shop compressor trick to confirm...I would assume that the exahust is free flowing....the intake eh..well its just open under the hood, pretty much how the pics on the OVS site show it..I thought this might be the problem, but you see so many that are the same way, ie just open under the hood...No BOV, I have not had it over 4psi yet, not for lack of trying though. 4psi is good, it spanks 800's and 900's but why stop there...

Could clutching cause this?

 

Last edited: Jan 20, 2008

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speeddemon

Well-known member

Feb 27, 2006

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buckley wa

• Jan 20, 2008

• #5

well i guess if the sled is not creating heat in the pipe cause ur clutching isnt right getting the rpm's u need i guess it is possible !!! do u have the heat sheild on ur pipe . u need as much heat in ur pipe to get the turbine spining . also what fuel pressure and control box u using , if ur to rich it wont create heat which = no boost .
mike

 

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02DOO

Free Member

Nov 26, 2007

90

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8

• Jan 20, 2008

• #6

pure logic controller and fuel reg...stilll have the heat sheild on the pipes...I thought the same on the heat...on a WFO pull i hit 1250 ish on egts and 8000rpm, I tryed to add more fuel but it wont rev and the egts are low..then i too away fuel and the plugs started to look scarey so i went back up...so I think im good on that front..I might try the clutching..i might have too much helix its a 40/44...but guys run a 44/40 with no boost...so I dont know....

 

Last edited: Jan 20, 2008

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DWHalverson

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Oct 19, 2003

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Rapid City, South Dakota

• Jan 20, 2008

• #7

Check the Y-pipe seem. I have had two different ones on mine pull the seem and not make over 5psi. Look close, the last one I had blow was hard to see. I welded both of mine and now carry a spare with me on trips.