306 D Turbo won't go above 90mph!

Hi,

I recently bought an R-reg 306 1.9 D Turbo (no history) and am rarely
on a motorway, but when I am it just gets to 90 - 93 mph and will no
go any faster - WTF!

the revs aren't going mad or anything, and the turbo works fine up to
90mph, it's like it has a limiter or something.

I've just bought some 10k Diesel (see www.10kdiesel.com) to decoke
everything, assuming I can find the turbo to spray it in, but I don't
know if it would help my problem.

Any ideas?

Cheers.

 

Does it have an intercooler pipe, if so,its prob fell off.

--


Kind Regards
Cheater

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"10k Boost is dispensed as a fine spray in to the air-intake system,
whilst the engine is running, the air flow carries it through the
air-inlet into the combustion chamber. 10k boost then passes out of the
open exhaust valve through the exhaust itself, decoking every surface it
touches."

What a load of bollocks! No 'protective spray' is going to survive
passing through the combustion cycle, and be able to 'decoke' the
echaust system on the way out.

It's snake oil mate - the best thing you can do is keep it serviced,
especially change the oil often. All these teflon wonder products are
basically fancy cans of kerosene.

Your car should be good for 100-110, so it needs to go into a garage for
a check-over. Likely to be fueling related, but pick a small expert
who'll have time to look at it carefully.

HTH

 

I got a petrol and believe me about 100mph is swift in a car that
size. Been at 120mph on M1 (late at night) and you wouldnt want to go
much faster. Gets a bit hairy!!! I think its down to the wheelbase,
cos its short it doesnt sit that well at high speed.

scott

 

Could well be your injectors that are full of crap or someone's been messing
with the turbo adjuster.

Pete

 

Interesting idea Neil. I have absolutely no idea what happened to my
car in the 5 years of its life before I bought it - it was from an
auction and didn't even come with a log book! However the gearbox
feels a little stiff so I'd be surprised if it's new.

Someone has also suggested a boost leak in the fuel pump (split
diaphragm). Wish I knew more about engines!

 

If it was a different gearbox the revs would go up.

Tobi

 

There's a thin hose going from the intercooler to the fuel pump that
basically tells the fuel pump to add extra fuel when the turbo is giving
boost. If the pipe is split the fuel pump doesn't sense the boost pressure
and doesn't add the extra fuel required to make full power. The diaphragm is
inside the fuel pump. The pressure in the hose moves the diaphragm which in
turn moves a shaft in the pump that inceases the fuelling. It is possible to
check the diaphragm for splits etc. but it requires some disassembly of the
pump and probably isn't a good idea if you haven't done this kind of thing
before.

Have a look over the fuel pump to see if any of the adjustment screws appear
to have been tampered with. Especially any marked with yellow paint if you
have them. It is possible that the maximum fuelling was turned down to
reduce the smoke for an MOT. If you have the Bosch pump the important screw
is shown here http://mysite.freeserve.com/sjp80/Power.jpg.

Shaun

 

Just had my cam belt changed, and at the same time got the guy to
check a couple of things.

First the throttle cable needed adjusting. It wasn't allowing me to
achieve full power.

Second the intercooler manifold seal needed changing – now it can do
110mph and is quicker overall!
(still not as fast as I'd expect but it'll do

 

110 mph on a private road I hope

 

Mine runs out of puff at 110 (on my private test track) as well.

 

Get a V6. It's still accelerating at 145mph... <g>