[Smokey88]

ok well today i was driving and i was getting onto the freeway and i nailed it just to have some fun and i noticed my car was pulling ALOT harder then normal i looked at my boost guage and the needle was around the 16 mark. i immediatly backed off and didnt nail it again all day. any ideas on what caused it to jump so high??? also do you think it would of hurt my enigine at all??? i havent noticed any ticking or sluggish response and my car didnt go to limp mode so i think im fine. just thought i would ask for some opinions.

[phillystangman]

16 psi is bad if you have stock internals. how much boost are you usually making? if you didnt do any s/c upgrades it is probably a fluke thing or your boost gauge got stuck I cant see it just creating boost on its own

[Smokey88]

well i was noticing that it was pulling harder then normal like it felt like i was riding a nuclear missle!!! ok ok exaggerating a bit..... but it was a normal pull and only when i get on it does it get to 11psi max thats what its set for. i usually get ten pounds though.

[sqidd]

Originally Posted by Smokey88

ok well today i was driving and i was getting onto the freeway and i nailed it just to have some fun and i noticed my car was pulling ALOT harder then normal i looked at my boost guage and the needle was around the 16 mark. i immediatly backed off and didnt nail it again all day. any ideas on what caused it to jump so high??? also do you think it would of hurt my enigine at all??? i havent noticed any ticking or sluggish response and my car didnt go to limp mode so i think im fine. just thought i would ask for some opinions.

As far as I know there are only two ways that it will “gain boost”. One is to put a smaller pulley on it, which we know that is not it and the other would be if a restriction was added to the system after the blower. Most likely cause of a restriction that didn’t involve major engine failure would be a collapsed or clogged up cat.

If it was pulling harder than normal it wasn’t the gage needle sticking. Stuck needles don’t make the car faster.

If your motor didn’t let go and it’s not making any noise it’s very likely you did ay damage. Engine failures due to overboosting result in major engine failure. You would be aware of it.

You don’t want to overboost it if you can manage it but you should go out and get back I the gas and see if it wants to push more than normal boost. Just be ready to back out of it. If it keeps doing it you will need to start the diagnosis process.

Good luck

[Smokey88]

your motor didn’t let go and it’s not making any noise it’s very likely you did ay damage. Engine failures due to overboosting result in major engine failure. You would be aware of it" i hope you meant didnt do any damage to the engine..... and ill try to see if my boost jumps again. thanks for the advice squidd

[stlwagon]

Wondering if a bad bypass valve could do that?

[tbrock]

What was the outside air temp? I took my stang out a few times in the winter and with the cooler air I was getting 13 psi where normally I get about 9 psi. Now that it is warmer I am getting the usual 9. Just a thought if it was cooler than normal you might have been getting a little more boost.

[stlwagon]

6psi is a lot for just a change in ambient air temp.

[travelers]

Air Density/ Barometric pressure can have an effect on it.

[PLstang]

Agreed, air temp might get you a little more but not 6 lbs.

You could have a malfunctioning bypass but even then......6 lbs.? I'm not sure about that. You can check your vacuum lines and such to the blower. You should be able to see the arm move back and forth on start up. It just clicks into place and I have seen those pop out so check that.

Other then that the diaphragm in the bypass valve might have popped (not sure if that's the correct terminology). Seen that happen before on occasion also.

[Smokey88]

ok well you guys were right, i was in prescott when the boost jump happened and it was about 43 degrees outside. oh and plstang and stl your a genius i think my bypass isn't working cause today everytime i got into it the boost was more then the 10 i had it set for. oh and im back in tucson now so its about 90degrees out. i called whipple and they said probably a bad bypass valve and that if i can somehow disconnect the valve they would send me a new one. thanks for the help guys