Turbo questions

[iguana]

chris_n said:

One question - you mentioned you are using LRP

Aggh horrible stuff, seriously its the sporn of the devil that muck, get some optimax down its guts.

[Ultra Violent]

In the next week or so i'll post some stuff on mods for 911/C2 turbo's. This will be based on my experience, rather than mechanical ability (or lack of), and a lot of expensive dyno time....

[DemolitionDan]

chris_n said:

they're pretty noisy on full boost anyway so you could just be describing the normal state of affairs.

I'm coming to the conclusion that this is the case, but I'm aware this could be wishful thinking so am taking the car to a specialist anyway. My main concern was due to the car's Jekyll and Hyde nature which I wasn't aware of before (My M5 was so well behaved in comparison).

chris_n said:

Your fuel consumption situation is certainly consistent with my experience - trickle round off boost and the petrol gauge needle is quite well behaved, but start using it as it's intended and it quickly takes a dive!

Been trickling around a bit but I've only been trickling around looking for places where I can floor it.

chris_n said:

As for popping and banging on a trailing throttle - mine certainly does it, not sure if it ought to but I've always presumed it's because the Bosch K-Jet is pretty notorious for over-fueling. Got to admit I quite like it, all adds to the sense of occassion around driving the car.

It does all point to overfuelling, my Ascona rally car (16v Astra with Twin Weber 45s) does exactly the same.

chris_n said:

One question - you mentioned you are using LRP, I didn't think you needed to on this engine because it's got hardened valve seats? I've always used Super Unleaded Hope I haven't been doing something daft!!!

LRP is much more common round my way than Optimax or other Super unleaded. I didn't want to use normal 95RON because of detonation. You're right about the valve seats; alloy heads and valve seat inserts are fine for unleaded.
Thanks all for the help, given the MPG situation this car is not going to be a daily driver so I am planning to take it to Cadwell on 18/10 and Donington 15/11 - maybe I'll see you there......

>> Edited by DemolitionDan on Monday 29th September 09:52