New Exhaust - More Power

[SXS]

The more the merrier - more to choose from, in fact ACT's big-bore system already helps the cerbera community, he spent a lot of time and resources to get it designed up and is highly recommended by Austec too. Tim's a dedicated TVR nut and will move mountains to give us what we want - If anyones got the ACT big-bore system on and got some dyno charts, bang them up on here!!!! Its all relative.

Now if I turned around and said I can get a full cat-back/de-cat-back - titanium system built for Cerbie owners for a ball-park figure of £950 - who'd be interested? A group buy of 10 and I'll sort it out - MASSIVE weight loss and a beautiful titanium resonance note, music to your ears

[Steve_T]

Sounds a bit tasty Ash.

[nsparey]

SXS said:

Tim's a dedicated TVR nut and will move mountains to give us what we want - If anyones got the ACT big-bore system on and got some dyno charts, bang them up on here!!!! Its all relative.

Ash, next time your at Austec, ask them to check their email or can you recomend somone else to fit the new ACT system?

Edited by nsparey on Tuesday 27th June 09:15

[SXS]

nsparey said:

SXS said:

Tim's a dedicated TVR nut and will move mountains to give us what we want - If anyones got the ACT big-bore system on and got some dyno charts, bang them up on here!!!! Its all relative.

Ash, next time your at Austec, ask them to check their email or can you recomend somone else to fit the new ACT system?

I think if you just drive in with your exhaust, Paul and his minions normally can squeeze you in, in the meantime you can watch him scratch his nuts while he's finishing off another job, over a coffee of course

[nsparey]

SXS said:

nsparey said:

SXS said:

Tim's a dedicated TVR nut and will move mountains to give us what we want - If anyones got the ACT big-bore system on and got some dyno charts, bang them up on here!!!! Its all relative.

Ash, next time your at Austec, ask them to check their email or can you recomend somone else to fit the new ACT system?

I think if you just drive in with your exhaust, Paul and his minions normally can squeeze you in, in the meantime you can watch him scratch his nuts while he's finishing off another job, over a coffee of course

No probs, Just got a reply, thanx Ash, two to three hours so maybe not a squeeze me in job, must be a bit of a fiddle to do.

[Cyclone1]

scania164 said:

Cyclone1 said:

Some of you will have read from my post last week that I have had a new exhaust system made for my Cerb. At the moment I have only had the back section fitted (from intermediate pipes back as per Sports Exhaust), I have had it made in 2.5" into the back boxes and 3" all the way tail pipes. My car went on the Joolz'z rolling road last week at TCS and put out:

407.4bhp and 379lb/ft (has consistently been between 406 and 410bhp since short induction and linked de-cats were fitted).

Now it has produced:

420.4bhp and 389lb/ft

Am I happy................you bet!!!!!!!!!!!!

It has gained between 5-15bhp (mainly 10-15)and 5-20lb/ft all the way through the rev range.

Here's the graph with the two runs overlayed, pre exhaust in purple, post exhaust in red.



We have a couple more mods to finish, the first being the bigger bore intermediate pipes which should liberate a few more ponies, and then another which I'll let you know about after we have tested it.

I'd be suprised if there is a Cerb out there that can match this sort of power and torque throughout the rev range (Boss Cerb excluded).

I love this tuning lark............

Jules.

ps.......I now have a Cerb as it should have been when it left the factory.

Edited by Cyclone1 on Saturday 24th June 09:50

Be suprised Cyclone daggart's gives more.Get yours down to Austec and get an independant check done!!.

Hi Scania,

Just had a look at the graph from Vixpy and I have to say that it is very, very impressive...................however, I'll have to stand by my original statement and say.....

I'd be suprised if there is a Cerb out there that can match this sort of power and torque throughout the rev range (Boss Cerb excluded).....

Jules.

[SXS]

Cyclone1 said:

I'd be suprised if there is a Cerb out there that can match this sort of power and torque throughout the rev range (Boss Cerb excluded).....

We should get Cyclone and Daggart and the 5litre cerbie together on a 20mph rolling start in 2nd gear - head to head - and see how the power curves reflect on the tarmac.... I wont mention the NOS cerb because thats just mad, but just for reference sake we can get Allans 4.2 alongside.... that would be interesting to watch.... why dont we do this kind of stuff?

Cream 2006? 2007?

[TJW]

Try getting the power down at 20mph in 2nd

[ceejay]

Well done Cyclone, that's a fantastic achievement from a stock 4.5, and best of all, while these mods have been done the car has still been giving smiles on the road which is where it really counts.

Ceejay

[SXS]

ceejay said:

Well done Cyclone, that's a fantastic achievement from a stock 4.5, and best of all, while these mods have been done the car has still been giving smiles on the road which is where it really counts.

Ceejay

Ceejay you're back? I visited your website just to keep tabs on your boat racing and noticed you are being sponsored by Autocraft? So You and Track Car Solutions and Autocraft are doing your race spec T350?

www.tvr-racing.co.uk/sponsorship.htm

Edited by SXS on Tuesday 27th June 21:55

[dean_ratpac]

Cyclone1 said:

dean_ratpac said:

jules, so is this zaust gonna be available to buy?

Hi Dean,

I am trying to pursuade the chaps who built mine to build some more. I reckon if I could get a least five definite buyers then they would hopefully go ahead. As soon as I know I'll post it up and email those who are interested.

Jules.

Thanks Jules the reason i ask i've just broken one of mine. so looking for a replacement. is it a bigger bore?

[Cyclone1]

SXS said:

Cyclone1 said:

I'd be suprised if there is a Cerb out there that can match this sort of power and torque throughout the rev range (Boss Cerb excluded).....

We should get Cyclone and Daggart and the 5litre cerbie together on a 20mph rolling start in 2nd gear - head to head - and see how the power curves reflect on the tarmac.... I wont mention the NOS cerb because thats just mad, but just for reference sake we can get Allans 4.2 alongside.... that would be interesting to watch.... why dont we do this kind of stuff?

Cream 2006? 2007?

Cream would be good? or Santa Pod

[Cyclone1]

dean_ratpac said:

[Thanks Jules the reason i ask i've just broken one of mine. so looking for a replacement. is it a bigger bore?

Yes bigger bore 2.5inch into 3inch tails, read here - www.pistonheads.co.uk/gassing/topic.asp?t=280171&f=6&h=0

Jules.

[ceejay]

SXS said:

ceejay said:

Well done Cyclone, that's a fantastic achievement from a stock 4.5, and best of all, while these mods have been done the car has still been giving smiles on the road which is where it really counts.

Ceejay

Ceejay you're back? I visited your website just to keep tabs on your boat racing and noticed you are being sponsored by Autocraft? So You and Track Car Solutions and Autocraft are doing your race spec T350?

www.tvr-racing.co.uk/sponsorship.htm

Edited by SXS on Tuesday 27th June 21:55

Hi Ash, I've never been away, just very busy so only posting occasionally but keeping up to date with all things Cerbie and PH. All of the info on next years car is on the tvr-racing.co.uk website which I'll try to keep up to date. If I can find another sponsor we may well have a go at Britcar next year too.

Ceejay

[scania164]

Cyclone,how much is your car now giving at the wheels,bhp and torque?.

[Cyclone1]

scania164 said:

Cyclone,how much is your car now giving at the wheels,bhp and torque?.

Phil,

Not sure but I can probably get the figures. The dyno graph for Daggart's car is the same that has been used for mine, ran on the same type of dynamometer, in the same gear, same mode and even using the same tyre pressures, therefore the at the wheels figures for both cars should be calculated the same way, so you would expect to see the same proportionate difference at peak power and peak torque. From the two graphs Daggart's has more peak power 430bhp v 420bhp, but mine has more peak torque 388lb/ft v 372lb/ft, interestingly the only point in the rev range where I lose out is at 6300rpm - 7200rpm by 10bhp (420 v 430) and 2-10lb/ft, between 2500 - 6300rpm mine has it by 5-20bhp and 5-20lb/ft. On the road not alot in it at all, but as Daggart's engine loosens up then it may be even more potent.

Jules.

[vixpy1]

Cyclone1 said:

scania164 said:

Cyclone,how much is your car now giving at the wheels,bhp and torque?.

Phil,

Not sure but I can probably get the figures. The dyno graph for Daggart's car is the same that has been used for mine, ran on the same type of dynamometer, in the same gear, same mode and even using the same tyre pressures, therefore the at the wheels figures for both cars should be calculated the same way, so you would expect to see the same proportionate difference at peak power and peak torque. From the two graphs Daggart's has more peak power 430bhp v 420bhp, but mine has more peak torque 388lb/ft v 372lb/ft, interestingly the only point in the rev range where I lose out is at 6300rpm - 7200rpm by 10bhp (420 v 430) and 2-10lb/ft, between 2500 - 6300rpm mine has it by 5-20bhp and 5-20lb/ft. On the road not alot in it at all, but as Daggart's engine loosens up then it may be even more potent.

Jules.

Yep, thats all correct

[scania164]

The only problem i have with all this is that my brothers engine has higher compression.Now all of a sudden std 4.5's are making nearly as much as the speced up RR engines and there all coming from TCS?.Now when Austec came on the scene claiming power gains they were slated and yet TCS has now remarkably pushed the boundries even further?.Cyclone didn't your Cerb used to give around 330bhp??? and now your getting 90bhp more without raising the compression ratio??.

[Cyclone1]

All the figures I get are about as close as you'll get to SRR as possible. What did Daggart's make on Austec's rollers, I think you know the answer to this so you'll get my point.

My car has also proved itself on the Drag Strip, if it didn't have the power then it wouldn't easily be the quickest there, driver technique included (whatever that is).

Like I've said Daggart's car is still the highest powered 4.5 out there and it still has the potential for more, as an owner I would be more than satisfied with that.

Jules.

[Cyclone1]

scania164 said:

Cyclone didn't your Cerb used to give around 330bhp??? and now your getting 90bhp more without raising the compression ratio??.

339.6bhp and 339lb/ft as std on an MBE, never had it tuned up or remapped on the MBE so do not know what potential it had, I had an Emerald fitted and the mapping / modding process started from there, the details of what I have done and what the gains were at each individual stage are available in previous threads from me, and I have always backed up my results with a graph and an explanation as to what has been done.

Remember, that most cars in the early days of "just" a remap were making between 375-390bhp, since then the short induction has been added (10-15bhp?), as well as linked de-cats (another 5bhp?), do the maths and you will see that cars having a full remap and short induction can make from approx 385bhp - 400bhp, with the linked de-cats potential up to approx 410bhp.

Jules.