'Fast Road' Tuning a 911 3.0
- Thread starter MikeH
- Start date
Guest
New member
Hi Mike, if your car is nr Oxford I am up nr Banbury, just past Tuthills, so only a junc or two away on the M40. We should try and hook up around here one day.
Most likely places for air leaks are base of the intakes, those gaskets quite often cracked at this stage. Replacing or at least cleaning the injectors all these years later is a very good idea. There probably won't be huge air getting in past the injectors but any seal replacing on these motors is a step in the right direction.
Other jobs worth doing: strip and clean the dizzy and advance mech and check all the vac lines. I recently stripped and cleaned my throttle body and fuel distributor too. The above plus changing the accumulator and filter and sorting a few minor leaks here and there gave me another 13bhp. You can't get the seals for the metering head but they don't half get gummed up also.
The intake is in the right place. Monitor the intake temps on the move or on a dyno with decent airflow (i.e. lots from the top and a bit from the front w/suction at the rear) and you can see that the intake is at ambient/atmospheric more or less. Bigger or longer intakes do not make more power on these, and the way it is from the factory stops rain getting in there. Backdated heat helps get more air around the engine, and making sure no leaks around the lower engine tin helps the fan do its job.
Main ways of reducing weight: a smaller battery gives you 10 kilos, losing the big washer tank and fitting something smaller good for 8 or 9 kilos, lighter fuel load a great idea, stock seats are heavy, sound pads mega heavy - especially engine one, some factory tails weigh an obscene amount: 20 kilos plus. Easy enough to take 50 kilos off the car if you have air con that is never used.
Don't let this 'weight up front to balance the rear' malarkey scare you, they grip fine with a light fuel load. I ran my SC with full tanks for a year or more before I started driving at high speed (no spoilers) with low fuel, the car is lots more dynamic with 50 litres less fuel and there is no change to stability, it grips just as well and is a more entertaining drive.
You should consider bringing the car on track with us one time. No eejits and lots of impact bumpers, all safely doing their own thing within their comfort zone but with no speed cameras and no traffic coming the other way. I recommend experiencing your own car at full throttle under Bridge corner, or finding out just how hard you can brake at 135mph. These cars are really great fun when pushing on, they are brilliantly stable and the stories of IB 911s being scarey cars to drive fast is a load of nonsense. You would be welcome to passenger with me anytime, see what it's like. I promise I won't scare you [
]
Cheers,
John
Most likely places for air leaks are base of the intakes, those gaskets quite often cracked at this stage. Replacing or at least cleaning the injectors all these years later is a very good idea. There probably won't be huge air getting in past the injectors but any seal replacing on these motors is a step in the right direction.
Other jobs worth doing: strip and clean the dizzy and advance mech and check all the vac lines. I recently stripped and cleaned my throttle body and fuel distributor too. The above plus changing the accumulator and filter and sorting a few minor leaks here and there gave me another 13bhp. You can't get the seals for the metering head but they don't half get gummed up also.
The intake is in the right place. Monitor the intake temps on the move or on a dyno with decent airflow (i.e. lots from the top and a bit from the front w/suction at the rear) and you can see that the intake is at ambient/atmospheric more or less. Bigger or longer intakes do not make more power on these, and the way it is from the factory stops rain getting in there. Backdated heat helps get more air around the engine, and making sure no leaks around the lower engine tin helps the fan do its job.
Main ways of reducing weight: a smaller battery gives you 10 kilos, losing the big washer tank and fitting something smaller good for 8 or 9 kilos, lighter fuel load a great idea, stock seats are heavy, sound pads mega heavy - especially engine one, some factory tails weigh an obscene amount: 20 kilos plus. Easy enough to take 50 kilos off the car if you have air con that is never used.
Don't let this 'weight up front to balance the rear' malarkey scare you, they grip fine with a light fuel load. I ran my SC with full tanks for a year or more before I started driving at high speed (no spoilers) with low fuel, the car is lots more dynamic with 50 litres less fuel and there is no change to stability, it grips just as well and is a more entertaining drive.
You should consider bringing the car on track with us one time. No eejits and lots of impact bumpers, all safely doing their own thing within their comfort zone but with no speed cameras and no traffic coming the other way. I recommend experiencing your own car at full throttle under Bridge corner, or finding out just how hard you can brake at 135mph. These cars are really great fun when pushing on, they are brilliantly stable and the stories of IB 911s being scarey cars to drive fast is a load of nonsense. You would be welcome to passenger with me anytime, see what it's like. I promise I won't scare you [
]Cheers,
John
MikeH
New member
Hi John
Thanks for the tips... I'm busy with the Wayne Dempsey book at the minute too, which arrived yesterday.
I've been a bit over 135 on a 'private test track'. I'm not sure I want to do track days in the 911. I've already got a trackday car (Mk2 golf 2.0 16v) and the 911 is a bit too precious...
It would be interesting to see how another 911 handles on an empty tank - mine definitely wants to slide too much at the front. Maybe a proper setup is needed.
Thanks for the tips... I'm busy with the Wayne Dempsey book at the minute too, which arrived yesterday.
I've been a bit over 135 on a 'private test track'. I'm not sure I want to do track days in the 911. I've already got a trackday car (Mk2 golf 2.0 16v) and the 911 is a bit too precious...
It would be interesting to see how another 911 handles on an empty tank - mine definitely wants to slide too much at the front. Maybe a proper setup is needed.
Posts made and opinions expressed are those of the individual forum members
Use of the Forum is subject to the Terms and Conditions
