Schwitzer Turbo

I dont really want to get too involved buy are you the only guys changing Turbo's every 600Km?

Compressor map's are based On Heat, So if you had to increase your cooling buy 50% turbo will last longer.
But its rally and you cant cos of the rule's. Maybee the Mitsi Factory Just mad a Batch Of bad turbo's Maybee ther Scaled Downthe Quality of there product's

I remeber 5 Years ago the Garrett T2.5 was inderstrcutable now, that they are made in china hence they so cheap they can even hold .8 of a bar...

Why Dont You use a Recycle Vavle it will be a Fair trade between have a DV and NO DV..

are the other guys in your division using dump valves?

NNBD

Some do, some don't, but no WRC has a BOV as far as i know. We do have a WRC engine lying around...its just that we don't use it since pretty expensive to have anything broken on it....everything is just a bit different...even the moulding of the block (just little things so WRC stuff doen't bolt up a stock engine to keep everything exclusive . Never the less, its a study project, our WRC engine. We examen it, and learn from the little smart tricks Although a 2nd hand WRC engine is way up in the 5 digit price ... ...

Btw, the mitsu turbo's are decent turbos...that is something i know for certain, when its still possible we rebuild them.

NNBD

oke, well we know what the problem probably is. The engine is so heavily modified and tuned, there is something very small going on...causing a vibration, slamming etc etc. Conclusion, we made the engine abuse the turbo so heavily that the turbo just isn't up to the job anymore. The radial bearings are like new, its the axial bearings that don't hold...
Since we cannot use another turbo cause of regulations, we CAN change the bearings (although BB isn't allowed). So we just have to upgrade the already upgraded bearings, something thats going to be tricky.
Lucky as we are, we have very good connections with a engine engineer who is like a guru with these things...(well, the guys from garret sometimes come to him when even they don't know it anymore...so yea..i guess he knows a few things...)...

There is nothing to be done with the tune...it would make it slower and that's unacceptable

So it will be fine with the next few turbo's
Also we're going to add teflon to the oil to get a better mixture.

PS: today i heard that the turbo just lasted 60-80 km in stead of 600. It drove exacly 200km, of which 60-80km were stages, the rest transport....so yea....its pretty bad.

CspecRun

I was askin' myself the same question, ESPECIALLY with some of the smartasses HERE who would rather just criticize than offer any ACTUAL help...Most people who are involved in something on that large of a scale, with that kinda money involved, would RATHER walk around with their nose in the air like they know everyf@ckinthing anyways...HOWEVER, those are some badass cars you guys have there, that ---- looks like fun...

Tom-Guy

BB is is downgrade from a journal bearing, homey, those things fail like clockwork.


You do realise that DuPont has publicly stated several different times that they do not recommend thier product, Teflon, for use in engine oil?



I agree, you are rather counterproductive.

NNBD

Why would i all get arrogant cause we drive cars of >100.000 euro a piece....we can always learn something from someone else....ALWAYS. If someone has a smart idea, why not listen to it ? i think thats just being stupid.

Obviously it's a lubrication problem together with a abuse problem. When the turbo gets slammed into the axial direction...very short and very hard (like when shifting, ALS etc, all little combinations), it will get a high frequent vibration, force whatever. It just slams the oil right out of the axial bearings for a fraction of a sec. IF we were coking, burning oil etc, the radial bearings would die allot sooner. There radial bearings are like ------- new.
There is an addon in the market, its teflonbased, but its for mixing with oil. I'll lookup its name. It was used allot 15 years ago with the cosworths for better lubrication.
Never the less, we don't have the right equipment to get an accurate measurement. Motec only logs with 200hz, we have a Labscope but its AD converter isn't fast enough. Also test equipment at XXXX Trucks (yes we have connections in the engineering department there), isn't quite fast enough. Also, we would have to get the engine on a engine test benche. Not really a problem but we got races to win...not a engine out of the car.
We're probably going to "engineer" our own axial bearings. We'll try to get the bearings coated with a special coating which is still being developed at XXXX. They ran a 100% dry engine with that coating for 8 hours. Nothing happend So that would be ideal for our bearings......

We would rather have corolla WRC bearings, specially developed by toyota, we know a guy that has one, he never ever killed a turbo. Its bearings are diamond hard Its just that they are not available other than for the WRC...pretty classified ----.

PS: about the BB's, i wouldn't know, but they guy that came by yesterday (the turbo guru that develops this kind of ----), told me that the problem WE have, would not be an issue with BB's....never tried it but the guy knows what he's talking about......

NNBD

It is.... The EVO 4 has about 310hp and 550- 600NM. We tested 0-100 km'h in 3 to 3.5 sec (with launch control). it's top speed is like 200-210 km'h but thats cause of the gear ratio's

NNBD

I haven't got pics of the bearings.. and im not able to make them. We gave it to the guy that came by so it can go to the lab for examination and an upgrade.
Its not a high EGT issue, its a high gradient, high frequent pressure differential problem. thats something we know 90% sure

Tom-Guy

The only way this happens is by changing the thrust direction. That happens by subjecting shaft velocity to a neagtive acceleration.

Dmc1 might be onto something with the burnt exhaust valve. A bypass/blow off valve is meant to prevent these things. I would not call it a lubrication problem as it is manufactured by a mechanical problem; there's no problem with the system's lubrication because something with the car is completely fucked.

Give her a leakdown, see where the compression in your low cyl is escaping to.