Low boost edit: problem solved...

t_w · Post by **t_w** » Sat Apr 05, 2008 6:57 pm

My 480 (B18FT, 1990) suffers from a low turbo boost.
I've searched the forum for different solutions, but found one that draw my attention.

It was a topic in which someone stated his boost was lower than normal. He also stated that his cat was 'rattling'.

I have exactly the same two issues...

Could someone explaine to me, how the 'rattling cat' has an influence on the turbo boost?

Derek · Post by **Derek** » Sat Apr 05, 2008 7:04 pm

When the cat starts rattling it breakes up and parts of it block the exhaust restricting the flow

t_w · Post by **t_w** » Sat Apr 05, 2008 7:10 pm

is it really that simple?

Derek · Post by **Derek** » Sat Apr 05, 2008 7:22 pm

yeh its that simple. happened on my brothers escort. easy way to fix it is to smash the insides out of the cat

chris1roll · Post by **chris1roll** » Sun Apr 06, 2008 9:50 am

Yep, happened to me in my 440, stalled the engine in lane 3 of the M5

Since yours is a 1990, smash the insides outof it and stick it back on again.

SMOOTH 480 · Post by **SMOOTH 480** » Sun Apr 06, 2008 12:11 pm

wouldnt smashing the cat out make a big void ? id get a nice piece of pipe and replace it

more power aswell

t_w · Post by **t_w** » Sun Apr 06, 2008 1:17 pm

SMOOTH 480 wrote:wouldnt smashing the cat out make a big void ? id get a nice piece of pipe and replace it more power aswell

The problem is, that I need a cat for the APK (Dutch for MOT)
So I'll try to empty it first. If it doesn't work, I'll buy a new one...

t_w · Post by **t_w** » Mon Apr 07, 2008 10:46 am

Well, cleared the inside of the cat this morning and the turbo boost is as it should be!

So I am one happy man!

chris1roll · Post by **chris1roll** » Mon Apr 07, 2008 7:08 pm

SMOOTH 480 wrote:wouldnt smashing the cat out make a big void ? id get a nice piece of pipe and replace it more power aswell

Yes it will, your right, however I think we were going for the cheapest and easiest option!

I have a decat pipe made from part of our old 240's exhaust, the pipe is now 26 years old!

Robou · Post by **Robou** » Mon Apr 07, 2008 10:43 pm

What I don't understand here:

1- The cat was up till 1993 courtesy of Volvo and so one can pass the Dutch MOT (aka APK) without it. Officially it is non existent.
2- The cat can be replaced with a standard muffler which fits exactly in place with the same flange. It has much less restriction than the cat. And is cheaper. A lot.
There is no mounting point for the oxygen sensor though. But the ECU of these cars can do without it. If you want to keep your sensor, a mounting point is easily welded in.