Driving with the wastegate disconected.

Japedo · Post by **Japedo** » 21 Jul 2009, 21:03

Hey everyone, I was fiddiling around tonight with my MBC as I just got a new intercooler and can build boost now. After I had it setup I decided I'd just remove it and see how the car works with the wastegate staying closed.
I know that was probably a stupid thing to do, but i'd never hit fuel/ignition cutoff before. The car sure pulls hard with the little vacume hose off the wastegate and it still wasn't cutting off. Deffinently likes spinning the tires more.
After a couple test runs I put the MBC back in place.
Just wondering what the negtive consequences could be of running the car with the wastegate stuck close. ??? All I know is it worked good and wasn't cutting out so maybe it could handle it for a while.
THankis for everyones opinion on this, and yes I may be an idiot

oh ya, the car is a 94 850T stock with 300miles

Post by **MadeInJapan** » 22 Jul 2009, 07:59

Don't do it- in the upper torque area, there is a chance your computer won't be able to compensate and you could detonate you engine.

Japedo · Post by **Japedo** » 25 Jul 2009, 08:16

THanks for the info MIJ. I kind of thought that I would damage something by building boost to quickly down low. Didn't think it was a problem on the top end.
Oh well sure did some good burnouts.

Post by **matthew1** » 25 Jul 2009, 12:00

Japedo wrote:Oh well sure did some good burnouts.

!

FCPEURO · Post by **FCPEURO** » 11 Aug 2009, 07:11

That should sum it up.

Japedo · Post by **Japedo** » 18 Aug 2009, 07:31

hahaha, ya gotta love a good explosion. I have the car working just as good with the mbc as I did with the wastegate dissconected. However I am unable to hit ignition/fuel shutdown from excessive boost.
I think my problem/boost leak may be my compressor bypass valve. Maybe my diaghram is leaking. I hear a "ch ch ch" when I cut throttle. As apposed to a slight whoosh.
any ideas???

FCPEURO · Post by **FCPEURO** » 18 Aug 2009, 08:09

It could be, but what is you boost gauge goin up to at full boost. Fuel cut was around 13 PSI on my 940T with the stock MAF.

Japedo · Post by **Japedo** » 18 Aug 2009, 17:32

well, unfortunantley all I have is the stock gage. It's boosting to about 80% of the white. BUt usually drops down to about 2/3 of the white zone.
I find I am able to hold a higher longer boost with about 3/4 throttle as apposed to wide open.
Deffinently going to need a cheap boost gage to get some actuall numbers.

curtis

FCPEURO · Post by **FCPEURO** » 20 Aug 2009, 07:25

Get yourself a boost gauge, even if you just borrow it from a friend. Once you have the numbers, let us know.