to much boost

[87supraturbo19]

well i finally got my hose off the bottom of turbo replaced today, but i am broke and i had to buy a peice of rubber flex pipe. seems more durable than just regular hose. anyways it was just a tad smaller. after installing it i warmed up my car and got ready take it for spin. as soon as i mashed it buckled and took off but my boost jumped up reallly fast and pegged out my stock boost gauge and hit fuel cut. my car is bored .050 over, 2.25 exuast and i shimmed the waistgate just a little(.062). my question, would that smaller pipe build boost faster and why am i hitting fuel cut? i cant be pushing no more than 10 psi. i plan on getting a bigger boost gauge and controller tomorrow.

 

[7M-GTE]

which hose are you talking about... the lower IC piping or something else? and where in MO are you... I'm pretty close to missouri...

 

[87supraturbo19]

ya the intercooler pipe off the turbo. Joplin,you?

 

[7M-GTE]

I'm in lawrence but I'm from olathe... that IC pipe shouldn't cause you to spike like that though...

 

[87supraturbo19]

is that very close to springfield? I guess i am gonna have to get a boost controller or take my shims out. . its freaking nuts . i didnt think that would make that big of a diff. it really sucks i cant put my foot in it.

 

[7M-GTE]

it's a few hours away... I'm in kansas city... I would take your shims out that could stop the spiking... try it and see... let me know I'll look to see what else it could be...

 

[87supraturbo19]

im still getting good boost but it actually cuts out around 7 or8 psi. still code 34 maybe its afm.in the tsrm is says it could be this

 

[lowbudgettarga]

if fuel cut is happening arouns 7 or 8 psi you my friend, have a boost leak.

 

[87supraturbo19]

ya thats what i would have guessed but i m building out ragous amounts of boost

 

[7M-GTE]

ya thats what i would have guessed but i m building out ragous amounts of boost

I'd say just go through all of your vac lines and redo them... just to make sure... I mean all the hoses are probably at least 20yrs old anyways...

 

[87supraturbo19]

how can vaccum lines make you build to much boost?

 

[williamb82]

you prolly have another pipe leaking somewhere, just cause it builds boost doesnt mean it isnt leaking.

 

[87supraturbo19]

i took my shims out, and i cant even give it quarter throttle with out the boost going over 8. i shouldnt be doing this if im stock.

 

[87supraturbo19]

i done a leak test and all my intake and ic pipes are good. it might be bov or other hose around 3000 pipe. its not the rubber connector between the 3000 and tb.i m lost.

 

[Wendigo]

Vacuumm line going to the BOV?

 

[87supraturbo19]

Vacuumm line going to the BOV?

its on there in good visual condition. are there other cases where this can cause it build to much?

 

[got_boosted]

I'm hitting FC at 7 psi because I have a boost leak at the rubber elbow directly after the turbo. Any leak in the I/C pipe system will cause abnormal readings from the AFM, usually causing early FC. If you're still having trouble, check your I/C piping for leaks (pressure test), and check all related vacuum lines.

 

[7M-GTE]

Just go through and replace all your vac lines... it'll save you trouble in the future... it's an easy job to do...

 

[87supraturbo19]

well i replaced all my vac. lines still no luck.

 

[7M-GTE]

replace IC pipes... or bov... I know when I popped my bov out I hit fuel cut almost imediatly... so you could have a slow leak...