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NeilR
1st August 2000, 17:27
The weeks (months even) leading upto the bigend failure saw the following.

Note that i don't condone speed in anyway but...

5th gear, throttle nailed, 7000+RPM. At about this point a greyish cloud of smoke would start to pump out of the car. It actually got very noticable and quite 'Thick', embarrising really http://bbs.22b.com/ubb/frown.gif

Ive seen something similar on BMW M3's when they are really gunning it in a vain attempt to pull away.

I put it down to air/fuel mixture (PE phase 1)or could it be the start of turbo failure.

Im trying to guage whether to replace my existing high mileage VF23 turbo with a VF28 ( no! i don't really want to but i will if need be ).

Lots and lots of relevant advice needed please as it's almost decision time.

Ive been offered a second hand Link which im really contemplating..... Costs of setting up????

NeilR

Anders
2nd August 2000, 00:12
Link = BRDevelopments.

Why go for a VF28 when Bob can map out the turbo lag from a VF22? http://bbs.22b.com/ubb/biggrin.gif

Any replacement ECU is only as good as the mapper! http://bbs.22b.com/ubb/rolleyes.gif

BTW Branco has replaced his VF28 for a VF22 and loves it and he is rather fussy! http://bbs.22b.com/ubb/wink.gif http://bbs.22b.com/ubb/eek.gif

NeilR
2nd August 2000, 07:59
Anders,

The VF28 is Free, it comes with the replacement engine.

The VF23 is my existing turbo with 75,000 miles on it.

The grey smoke only happens in 5th gear.

I need to make up my mind......old VF23 , new VF28 (free) , cheap(ish) Link + cost of setting up or Free remap of PE phase 1

I really need to guage from you guys what is causing the high rpm grey smoke.

Any takers? ta, NeilR

Chef
2nd August 2000, 13:00
I'm not touching this one with a 20ft bargepole!

pat
2nd August 2000, 16:24
Neil,

odd that it only does it in 5th... but grey smoke doesn't sound too healthy, at least on a car that isn't running leaded petrol :)

Perhaps it's worth getting your VF23 checked over... you could even get a VF23 hybrid constructed by Turbo Dynamics (IIRC) which will take your impeller to more than 2 inches [oooo err... :)] Should flow enough air to inflate an airship :)

Another possibility is that the smoke at high revs was due to detting... I have noticed "smoke" from my car when it encounters transition det, and the FPS module generates HUGE amounts of smoke, extremely loud bangs and 3 foot flames :) None of this is oil though, just unburnt / partially burnt fuel.

As for Phase 1, I would stay well clear of that. Not saying that the map wasn't right for the day it was mapped, but the JECS seems too reluctant to do anything about det... at least the Link *WILL* back off the timing if it detects det, and with Bob mapping it, this should never happen in practice.

Sorry I can't be more precise on this one, but it's difficult to guess at what is really causing the problem without seeing it and seeing what the car is doing at the time... ie with det cans and a LambdaLink.

Cheers,

Pat.