Autobox question in relation to my 480s

martinholmesuk · Post by **martinholmesuk** » Tue Aug 24, 2004 5:45 pm

OK I own two 480 Turbo automatics,

Most of you know my lack of GO on my 480

I did this

Select drive, put foot hard on brake, put other foot on gas and the car revs to 5k (turbo spins up and works) and the car wont move.

take foot off brake and it moves off but nothing special.
(no wheel spin or kick in short NOTHING) (Just under red on turbo)
I'm now running volvo std boost and it's less revy and usable power.

New 480 from ebay!

Same thing as bove but car wants to move off (you feel it) only revs to 2.5k MAX , Turbo comes on and let foot of brake and she wheel spins and shoots off!!!! (normal boost)

I spoke to rpruen and he said this

The reason your car ends up all 'revvy' is that the torque converter is slipping more due to the extra power, that generates more heat, and thins the ATF, thinner ATF makes the torque converter slip more........

I did not give him all the info above but I just said the car is all revs and no power from these revs!

I think his got a point. Anyone else want to comment?

chris1roll · Post by **chris1roll** » Tue Aug 24, 2004 6:00 pm

makes sense, kind of like a slipping clutch in a manual car, ie lots of noise but no go!
perhaps you should change the ATF, or maybe change the box, as its possible the valves/seals in yours have gone/going?

martinholmesuk · Post by **martinholmesuk** » Tue Aug 24, 2004 6:04 pm

Used to woop between 2/3 but ok now i think. Changed atf already
car seems better when cold so thats when the atf is stioll thickish i think

chris1roll · Post by **chris1roll** » Tue Aug 24, 2004 6:04 pm

in fact, when i drove it, thats kind of what it felt like, lots of revs, but not actually that high a speed. whats the max speed in third gear BTW? my sisters ES auto would do 85 ish

martinholmesuk · Post by **martinholmesuk** » Tue Aug 24, 2004 6:17 pm

Not sure about that. I have always said it's all revs no power.

chris1roll · Post by **chris1roll** » Tue Aug 24, 2004 6:21 pm

perhaps i didn't phrase that quite right, lots of revs, no power so less go.

JohnTurbo · Post by **JohnTurbo** » Tue Aug 24, 2004 7:04 pm

I've always been under the impression that an auto has a thing called a fluid fly wheel to transmit the torque, this must be the "torque converter" right?

I used to have an expensive kit radio controlled car (back when i used to race them national level) which had a fluid flywheel instead of a friction clutch. The idea witht hat was that of the several grades of fluid available, th lightest would give the smoothest transfer of power and more grip when changing texture under heavy acceleration, and the thick fluid was like a kick in the back, but a bit mad.

That said, it does sound a bit like the clever peeps up there ^ have a point....bearing in mind that the fluid flywheel is like a fan in a chamber full of fins, the spinning flywheel, accelerates the fluid, which by viscous friction spins the cahnger which is the output.

Bramdeman · Post by **Bramdeman** » Tue Aug 24, 2004 7:14 pm

Well i read that whole thing about keeping your foot on the brake and letting go in full throttle. I tried it on my n/a 480 auto and on a '82 Mercedes 280se (a real nice automatic btw) and on both cars it didn't really feel faster than just stomping on the gas without the brake...

rpruen · Post by **rpruen** » Tue Aug 24, 2004 7:21 pm

martinholmesuk wrote:OK I own two 480 Turbo automatics,

New 480 from ebay!

Same thing as bove but car wants to move off (you feel it) only revs to 2.5k MAX , Turbo comes on and let foot of brake and she wheel spins and shoots off!!!! (normal boost)

I spoke to rpruen and he said this

The reason your car ends up all 'revvy' is that the torque converter is slipping more due to the extra power, that generates more heat, and thins the ATF, thinner ATF makes the torque converter slip more........
I did not give him all the info above but I just said the car is all revs and no power from these revs!

I think his got a point. Anyone else want to comment?

Your torque converter is buggered. I say this particularly as you already changed the ATF. It could be that the converter is clogged with burned ATF, or that the valves / pump are in a bad way.

Since you have a spare, then just swap it over. You could take the box appart, but it's hardly worth it if you have another.

Richard

martinholmesuk · Post by **martinholmesuk** » Tue Aug 24, 2004 9:49 pm

Well at least i know it's fucked now!

JohnTurbo · Post by **JohnTurbo** » Tue Aug 24, 2004 9:53 pm

I agree, gearbox parts are insane, a replacement 5th gear synchro sleeve for my ibiza would have cost 90/80/70 quid from vw/seat/skoda in that order (same part, same factory). And thats a small ring of forged metal about the size of a coffee lid.

Just get it in there martin!

I remember the revyness of your 480, but assumed that was just a characteristic of the auto....having never been in one.

martinholmesuk · Post by **martinholmesuk** » Wed Aug 25, 2004 7:13 am

Now i'm confused.

I done the test again this morning with my 480 and it's now doing the same as the ebay 480!!

2.5k revs and it wants to move then let brake off and she wheel spins (it was wet) but it's never done that before.

Last test was with MBC and it's now on stock volvo turbo valve.

pol · Post by **pol** » Wed Aug 25, 2004 7:21 am

Get a manual gearbox!?

pol

JohnTurbo · Post by **JohnTurbo** » Wed Aug 25, 2004 12:08 pm

He needs a license too tho, not sure if i'd pass that these days, i can't drive at thirty, its like i'm allergic.

martinholmesuk · Post by **martinholmesuk** » Wed Aug 25, 2004 1:19 pm

I don't understand why the mbc gave me more revs but less power.

I mean it wanted to move at 2.5k revs and it was starting to move and the turbo was spooling and making power.

With the MBC I got no power but all revs!

Help me guys please

What is wrong with that? MBC = more turbo boost but then remove it to volvo valve and i get more power but less revs.

rpruen · Post by **rpruen** » Wed Aug 25, 2004 8:31 pm

martinholmesuk wrote:What is wrong with that? MBC = more turbo boost but then remove it to volvo valve and i get more power but less revs.

There is something wrong somewhere. Catgroom has an auto, and an MBC, his car doesn't do that. So I still say you have a gearbox, or most likely, torque converter problem.

Richard

martinholmesuk · Post by **martinholmesuk** » Wed Aug 25, 2004 8:42 pm

it's a PITA.

JohnTurbo · Post by **JohnTurbo** » Wed Aug 25, 2004 8:46 pm

grey turbo, clutch slipped, guy said it worked better when cold. if i'd have put an mbc on that, it would have gone slower, because it would have just instantly made the clutch slip. Could be the same...picture this, mbc boosts, torque spins the TC so fast that it doesn't grip. yet if you are more gentle with it (no mbc) its works ok.

chris1roll · Post by **chris1roll** » Thu Aug 26, 2004 8:28 am

thats what i was thinking: the ATF will be thicker when cold, so more "grip"

of course braking and acelerating simultaneously will speed up its demise....

Volvo 480 Club Europe

Autobox question in relation to my 480s

Autobox question in relation to my 480s

Re: Autobox question in relation to my 480s