23 replies to this topic

[Ibexx]

I'm fitting a Weber 45 on my 1380. Because of my dashboard and 5" manifold I only have 80mm available for stacks and an air filter. According to the bible stub stacks provide the best airflow for the Weber and they require very little space. I therefore went to look for these. I was very surprised to find that nobody makes them except for MED with the DCR System. This is outside my budget and is 100mm deep. They do make plenty of stub stacks for the Hif44 and HS6.

My question is, does anyone know where I can get them? Or can somebody measure their Hif44 or HS6 to see if they would fit on a Weber. It's the distance between the two holes for mounting the air filter (65mm on a Weber 45)

See the first drawing


Want something like this:

Edited by Ibexx, 25 March 2009 - 10:08 AM.

[Nightrain]

MED do a kit for webers, a SU stubstack will not work/fit.

[WiredbyWilson]

can you not just buy ram pipes - thats what i did mate.

i have some in the shed that i was running when i didnt have a bulkhead box, left just enough room the slip socks over them - was snug though!!

[Nightrain]

Actually Webers should come with ram pipes, there actually a integral part of the carb and they don't work properly without 'em.

[Ibexx]

MED do a kit for webers, a SU stubstack will not work/fit.

Yeah i have looked at the MED kit, but that requires 100mm and I only have 80mm available. I have e-mailed them and they want 125,- for just the stub stacks, which I think is not a fair price.

can you not just buy ram pipes - thats what i did mate.

i have some in the shed that i was running when i didnt have a bulkhead box, left just enough room the slip socks over them - was snug though!!

I have looked at the normal ram pipes. The standard shaped Weber ones are pretty good at messing up the airflow. I have found full radius ram pipes, but they are 30mm high. You need about 32mm of clearance between the top of the rampipe and the filter. Which means I have to get an 80mm air filter from Pipercross or ITG, which in turn means that the filter is touching the car messing up the airflow through the filter. 20mm full radius ram pipes would be great too.

I've also read that the socks aren't any good because the carb needs to balance the airflow.

I want to get the best, and the stub stacks seem to be the best solution.

[Paul Wiginton]

Why a 5" inlet?
If you use a 3.5" Maniflow you can fit the standard Weber trumpets. They will go just into the original bulkhead hole.

Paul

[Ibexx]

Why a 5" inlet?
If you use a 3.5" Maniflow you can fit the standard Weber trumpets. They will go just into the original bulkhead hole.

Paul

Because Vizard says the 5" Maniflow gives the most power/torque. That 1,5" difference would have saved me a lot of time though... But again I want the best solution.

Is there somebody who can make them? I'm sure there are other people interested in getting a few extra BHP's for relatively little money.

[WiredbyWilson]

Sounds like you want top power, for little money and want to do it your way.

In that case - fit a weber box, 5inch mnifold and some proper weber ram pipes as vizard shows the best length for airflow.

Failing that you WILL have to compromise something.

No there are no companies that want to seel stuff cheap that gives good bhp - makes no business sense!

[Ibexx]

Sounds like you want top power, for little money and want to do it your way.

In that case - fit a weber box, 5inch mnifold and some proper weber ram pipes as vizard shows the best length for airflow.

Failing that you WILL have to compromise something.

No there are no companies that want to seel stuff cheap that gives good bhp - makes no business sense!

I have fitted the 5" manifold and have made a Weber box. The thing is that Vizard says the stub stacks are best for maximum airflow. If I'm wrong then I'd gladly fit ram pipes.

I don't mind spending money, but the price has to be somewhat proportional to what I'm getting. Two alloy rings for £125,- is not gonna happen. The ones for the HS6 in the opening post are £11,-. I think it does make business sense if noboby makes them and can be made for a few quid with the right equipement.

Anyways if there's no solution i'll go with the normal ram pipes.

Edited by Ibexx, 25 March 2009 - 11:27 AM.

[WiredbyWilson]

Im sure webbers only ever use trumpets, and if memory serves Vizard book shows which ram pipes to use, as sais above I don't believe webers were designed to work with stub stacks.

[Nightrain]

The other problem with the wrong stub stacks is the auxiliary venturi will be loose, as the weber ram pipe holds it in place.

[philc]

i have tried stubs stacks and found a reduction in torque, changed back to rams i think 60mm ones and work a treat with a good filter

[Paul Wiginton]

A long inlet gives more power and a short inlet gives more torque.
If you want torque which is more important than power in most applications you could try the 3.5".
Just a suggestion.

Paul

[Ibexx]

The other problem with the wrong stub stacks is the auxiliary venturi will be loose, as the weber ram pipe holds it in place.

True, the MED kit has spacers for this. I was planning on cutting of the original pipes for this.

i have tried stubs stacks and found a reduction in torque, changed back to rams i think 60mm ones and work a treat with a good filter

Ok, good to know. Thing is that Vizard states that with the original pipes the airflow lets go of the side of the pipes therefore limiting the amount of air going through them.
I now think I'll go for these: Clicky
This seems to be the closest to what I want. Does anyone have any experience with these?

[Ibexx]

A long inlet gives more power and a short inlet gives more torque.
If you want torque which is more important than power in most applications you could try the 3.5".
Just a suggestion.

Paul

As I'm now only using the car on the track it's the power I'm after. This is why i've changed from my double HS4's to the Weber. If I'm not happy with the amount of torque then the 3,5" would be the way to go. It all depends in the other parts installed, probably making it a bit trail and error. Can't wait to take it out! First have to get it setup though