drifting any one ?

[foggyjames]

Hehe, the man makes an excellent point

cheers

James

[classicswede]

James,

exhaust do give very good improvment in power. I would be more than happy to prove this. Sticking on just a rear can may not do much but a correctly built full stsem will give impressive gains in power.

For tuning a stock 1.7 I would start with the exhaust first air cleaner and re set the carb to cope with this. Cams could be done but a engine conversion may be a better next step. The 2ltr from a 460 can be very simple to fit. The other option you have is a twin webber conversion (would fit both engines) Non of these mods are cheap and the car is going to take some cash to make it shift.

[foggyjames]

A full system including manifold makes an appriciable difference if it complements the general 'tune' of the car, but just swapping to a "straight through" system on an otherwise standard car is going to have a minimal effect in my opinion...unless of course the standard system is particularly bad for performance - which it is on a 360, for example. It's not good even on a standard car, and mine is flowing a lot more air than standard...so I'm sure my exhaust is holding the car back. It's pretty high up my 'to do' list.

On the other hand, Adam had a K&N and his fancy exhaust when I went to see him in the summer, but he wasn't pulling away from Nessy noticably, despite Nessy's engine being less than A1. That's almost certainly because the intake and exhaust setup on the B14 cars is fairly well matched to "where the engine's at". In that case, the best solution is probably just to put a larger displacement engine in - the B14 is pretty much beyond hope for serious performance usage.

It obviously varies from car to car, but I think the Max Power culture of air filter, zorst and chip is too much of a blanket treatment. All of that together will add...what...10bhp max on the average NA car? Not great, given what that stuff can cost.

Having said that, it's easy stuff, so if people wanna have some fun with it, why not?

cheers

James

[pettaw]

I'd love to see the proof that an exhaust on its own can give an improvement in power. Ok, sure if you're flowing more air throughout the engine with bigger cams, air etc, then it makes sense to do an exhaust with more power. And, IMO the stock 360 exhaust flows pretty well, provided you get a proper one and not a cheap aftermarket one which is too restrictive.

IMO, and it is my opinion, no proof of this although there is plenty of anecdotal evidence to support this, but many exhausts, give more noise and less power than stock.

[340cbr]

If I have not swaped my 1.7 engine, what I have done was:

- Volvo 440 B18K carburator with upgraded jets
- some uprated exhaust
- Volvo 440 B18 EP camshaft (I think that it's the 18EP one)
- Taking out the air filter

But... take that engine out and put a turbo one instead!

[Frits]

Did anybody tried multipoint injection on the 1.7?

[foggyjames]

MPI on the B172 would make for a nice drive, I think.

cheers

James

[Carl]

What do you want the car to do? Stock when running correctly the 1.7 can just out accel a 205 XS

Sorry Chris, but there's no way a stock 340 would out accelerate a 205 XS. The 205 would either not be trying, or be shagged!

[foggyjames]

It seems the man has a good point - a 205 XS being a closer match for an injection 360 spec-wise (and a bit quicker off the line, probably thanks to the weight).

cheers

James

[Chris_C]

Shagged could be right, it was Matt's

[Carl]

If it was a WMC XS it was bound to be shagged

In the dry I think reckon the 205 could take a 360 too. They're suprisingly fast little cars. I had one for about a year, which I must have done around 30 events in, so know them quite well!

[classicswede]

I'd love to see the proof that an exhaust on its own can give an improvement in power. Ok, sure if you're flowing more air throughout the engine with bigger cams, air etc, then it makes sense to do an exhaust with more power. And, IMO the stock 360 exhaust flows pretty well, provided you get a proper one and not a cheap aftermarket one which is too restrictive.

IMO, and it is my opinion, no proof of this although there is plenty of anecdotal evidence to support this, but many exhausts, give more noise and less power than stock.

If you look at most cars from the 90's back then an exhaust is proably the cheapest biggest gain in power you can get.
Typicaly you will get a 10 - 15% increase in bhp with a good manifold back system. On cars with a very poor restriced system (B20 amazon) you can often get much bigger improvments.

Modern cars tand to have better flowed systems (bar the cat that has to stay if on petrol) and thus only lesser gains should be expected.

[pettaw]

I'd love to see the power graphs to back that up. Not saying it can't happen. But I think that those sort of percentages seem very optimistic IMO.

You're right that on Amazons, the stock exhaust created a lot of back pressure and to convert to Unleaded fuel, you had to put a larger bore system on to stop them burning exhaust valves, but on a car designed for it all that's a more difficult case to argue.

[foggyjames]

I think it varies massively from car to car...I just don't like the "K&N and 'zorst, now it's modded.....SIIIIC" thing that Max Power seem to endorse.

cheers

James

[V6 Man]

I think it varies massively from car to car...I just don't like the "K&N and 'zorst, now it's modded.....SIIIIC" thing that Max Power seem to endorse.

cheers

James

Yet ironically the one thing that's strangling your car at the mo is the fiendishly restrictive back box...