exhaust - feedback & pics please?

[Miura]

I know a lot of you guys have upgraded to Powerspeed or Caterham 4-2-1exhausts.

I am in no doubt these are valuable upgrade compared to the original system but I currently run a CC 4-1 race exhaust which I really like ....

 

... However, I have upgraded to Supersport spec and as the engine is peakier the lack of low/mid range torque is now more obvious. Some suggests that the 4/1 exhaust maybe worth changing.

 

So, I'd be interested in feedback of powerspeed/ CC 4-2-1 users on performance, reliability, noise output. Especially if you have upgraded from a Caterham 4-1 race exhaust. Pictures of the Powerspeed would be nice as well

 

thanks

 

Edited by - miura on 31 Jul 2006 15:17:52

[robmar]

pictures of my powerspeed exhaust

 

after 3+ years it could do with a repack

 

been reasonably happy with it considering the price

[CageyH]

Miura,

 

Have you had vernier camshaft pulleys fitted, and the cam shaft timing done?

This made a big difference to my car, and it is cheaper than a new exhaust.

[Miura]

Cagey, yes we did fit cams with verniers and played with the timing so I am confident we got that right

robmar

[CageyH]

I am not sure changing the exhaust will give you a huge improvement.

You would probably be better off fitting the larger "trophy" throttle body and fettling the inlet manifold.

[John Howe]

Thomas, I fitted a Powerspeed system to Adam Q's car on Friday. When would you like me to do yours?

 

 

This is the most cost effect upgrade you can do... IMHO.

 

 

 

 

 

JH

Deliveries by Saffron, the yellow 230bhp Sausage delivery machine

[Miura]

John why do you keep looking at my threads when it's about me spending Money 😬

Remember: I already have a 4-1 long primaries and not the original system ...

 

Anyway you can't play with my car for the moment as it is with Rat Race for a "nose job"

 

How did you find that powerspeed anyway , quality wise?

 

 

 

Edited by - Miura on 31 Jul 2006 17:14:37

[CageyH]

As you aleady have the long 4-1, you may be better off with some head work and an emerald.

Speak to Oily and see what he suggests.

[AdamQ]

Thomas, I fitted a Powerspeed system to Adam Q's car on Friday. When would you like me to do yours?

Thomas, as always Mr H did a grand job so if you do go down this route, he's your man. Just don't try and be helpful and take along your own Dremel - he takes the pi$$ out of its puniness beside his ~25 BHP die grinder 😬.

 

As for the quality, I don't know what John thought, but it looked good to me: all the holes were in the right place and everything fitted (all we (well, John) had to do was drill another hole in the front mounting bracket). The finish looks impeccable.

 

As for noise, I wouldn't have said there was much in it either way. The Powerspeed makes a slightly deeper, less tinny, noise. If anything, it's slightly quieter I'd say (all very subjective though). As for performance, it's made a noticeable difference. As somebody else posted a while back, the engine is more 'free' and much less asthmatic (remember though that I switched from the 4-1-inside-the-body exhaust). Previously, I got a shove in the back at about 4700 rpm and that's now less pronounced as there's more oomph lower down.

 

FWIW,

 

Adam

[david nelson]

I am unsure about the diffrence between the 2. what real diffrence will it make? unless you can pop it on a RR and see you are unlikly to know.

 

i also think it might depend on the state of engine tune.

 

David

[CageyH]

Might be good to have a change in cams?

[Dicky]

Thomas,

 

I have just upgraded from the Caterham 4-1 race exhaust to a Powerspeed 4-2-1 system and in my opinion the diference is quite obvious.

 

The car feels quicker (well quicker reving anyway), has more low down torque and is much quieter. I did not think that it would make much difference but I was wrong I think.

 

The car is a standard 1600 Super Sport.

 

I do not have any close ups but you might be able to see it on my Webshots page here and look under Mull 2006.

 

Richard

[davef]

There's a few photos here of my PowerSpeed system being fitted by Dave@PS.

 

I'll echo the comments above - freer reving, less asthmatic. Noise was last measured by MSE in PAril - that was 96db (1.6K SS at the time) - I think it is louder now since changing the engine.

 

dave

 

[Miura]

Thank you all for feedback and pics.

Dicky what you say is particularly interesting as you were in the same configuration I am now (1.6SS w/ 4-1 race)

Mmm, I'll have to think about it. I think I will start with a 52mm TB and take it from there

[Bozz]

Miura

 

My 1997 1.6SS now has verniers and a 52mm TB, but standard short primaried exhaust (and cat). These two changes made a big difference, particularly the verniers, to the mid-range but both upgrades were reasonably 'cost effective'

 

Next upgrade would (will 🤔) be changing the exhaust, but don't expect quite the same performance leap. It will certainly be a more expensive upgrade.

 

The only downside of the Powerspeed system as far as I can see is the size of the side skin hole needed for the primaries which I don't think looks very pretty ☹️

 

 

Bozz

 

My Chocolate Orange here

[Miura]

Bozz good point about the hole

Dicky did you have to enlarge the one thatw as already there 🤔

[Tom_C]

If you do change the whole lot, first dibs on the existing 4-1...

 

Cheers

 

Tom

 

FH54WLX - only the car supports ManU, honest!

 

see here - UPDATED

[Miura]

Tom, your interest is dully registered

[Kevsta]

First dibs on the....oh damn...alright second dibs then (how about that, the guy is thinking about a chnage and we are already after his left overs!)

 

 

Should get mine running first (as the mrs would say)

[Miura]

Kevsta 😬

I haven't said how much though 😬

I am seriously considering the change , I will let you know in due course

but you have second dibs

[Miura]

SC, I have replied to your blatmail re: exhaust

don't know if you got my message though as Blatmail rarely works for me

if not blatmail me a valid e-mail address for you, thanks

[Graham King]

Miura, can only echo comments about PowerSpeed system, as to the size of the hole, I had mine fitted by PS and they contoured the hole nicely around the shape of the pipes so no large hole evident at all. This was changing from a standard exhaust so can't say exactly how the race exhaust would affect this but they took a huge amount of time and care about cutting the hole.

 

Graham.

 

R7 GPK

Superlight #85

[Casbar]

Put a CC 4:2:1 on in 2003, does what it says on the tin

 

May not sound as good But on an R300 engine, measured 98db at Keevil and 100db at Oulton a couple of weeks ago. No need to re-pack, but eventually the packing will blow out I suppose and then you have to either buy a new can, or cut it open and try and re-pack. But 3 years on, its still fine.

[Andy Best]

In Jan I bought a Caterham 4-2-1, but this was to upgrade from the internal collector.

 

I don't know how the Powerspeed and Caterham systems stack up on the RR but I would expect there is not too much to choose. The powerspeed has a better can (repackable) but I prefer the (looks) of Caterham primaries/collector.

 

The reason I chose the Caterham system was down to cost (no BB running on powerspeed at the time) and the thought I would get a Raceco can at some point in the future with either system.

 

As has already been mentioned the Caterham system has a smaller exit hole than the Powerspeed system. It is also smaller than the old Caterham race system you have. This means you maybe best with a Powerspeed.

 

Hope it helps

 

Andy

 

Edited by - Andy Best on 3 Aug 2006 22:06:16

[Grubbster]

Miura, I have a powerspeed 4-2-1 and a load of pictures here including fitting and repacking. Very happy with it, gives a very noticeable improvement in mid-range compared to the standard exhaust (the one with the collector under the bonnet, not the same as yours). Workmanship is very good. The only problem I have had is noise (search powerspeed grubbster in tech talk for the story) but it is fine now. I believe Dave modified the design (smaller perf tube I think) to make them quieter. Mine has a small 'bung' made of perf tube in it now, supplied by Dave and it makes it OK for track use (pictures at the same link above).

 

HTH

 

Steve

 

Roadsport build photo's here

Le Mans 2004 photo's here