Broman_The_Swede

I have a thought about my boost..
I run with 4 "pulley and reaches only up to 10 psi, and no signs of belt slip what I can see.
i´ve tightened all the clamps on the sc.
I logged boost pressure, and the graph looks ok.
Could it be the map sensor?

My setup:
Vortech + after-cooler, 4 "pulley, gatorback belt
Rev limit 9200rpm
Stock hg
E85
340 aeromotive fuelpump
Aem ems, stock map sensor
ID 1000cc injectors
Toda header
T1R 70 EM exhaust, testpipe
Greddy RS bov

Ideas?

/Broman

Chulos2k

map sensor wont stop you from making more then 10psi..

I thought 10psi was average for the Vortech kit with a 4" pulley, maybe someone else can chime in..

Moddiction

I made 12.5 psi with the 4" pulley. AP1.

Did you try putting the stock vortech bov back on? Did you do a boost leak test?

Broman_The_Swede

I noticed the loss of boost when i was in the rolling road, and i read that the stock bov only could handle 8psi.
Then i switched to this greddy rs without any difference, so i let it stay on.
Then i noticed that the core in the aftercooler was leaking water, and i bought another one.. thought that the boost went out that way.
i have never done a boost leak test on the car, you mean like plug the pipe after the aftercooler and blow air into the supercharger?

leo520

I am only making 10 on 3.8 .ap2

Moddiction

The stock vortech bov has been working great for me for a couple of years running 12 psi.

For a boost leak test would need to pull the after cooler off the sc and then cap it with something that seals it well and has a little nippe or compressor line connector. Then just pump 12-15 psi or so into it and see if any is leaking out. It will always bleed out a little slowly but if all the air bleeds out right away or you hear it hissing you know you have a leak.

joes sled 2000

Four inch pulley here with around 12 psi . Youre running the stock map sensor ? Not a qood idea above 11 psi . That is more than likely youre problem . The oe map sensor cant read over 11 psi if you try to run more boost it just reads wrong .

Broman_The_Swede

"map sensor wont stop you from making more then 10psi.."

Yes i´m running the stock map sensor, but like Chulos2k says will it really make me stop making more boost?

Chulos2k

From my understanding no, as I was running the stock map sensor and making 12 psi..

I know its not recommended to run stock map sensor for anything over 10psi but it wont stop you from making more boost, you just cant tune for it properly.. but meh what do I know..

SgtDuracell

is your motor built? lower compression ratio? this is apparently what held my boost back 2 psi.