Rear exhaust pipes ?

[stesrg]

phazed said:

Your splitter is so similar to mine!

Yes I like it and want one :-)

The rear I was going for vertical diffusers not the horizontal ones imo they look better , saw some home made ones on a lotus and they looked the BO!!ox
Ste.

[stesrg]

phazed said:

Your splitter is so similar to mine!

Yes I like it and want one :-)

The rear I was going for vertical diffusers not the horizontal ones imo they look better , saw some home made ones on a lotus and they looked the BO!!ox
Ste.

[phazed]

stesrg said:

phazed said:

No, a friend had it made for a cerb.

I chopped it about and recently fitted it to my chim.

Hopefully it will knock a tenth off my time at Curborough

Ohhhh churborough been round their a few times my old sunbeam alpine was faster round the circuit than the Griff !!
Lol.

Currentish TVR times for the circuit we use.

Fastest lap time is held by a Caterham R500, 1.20ish.

1) Steve - TVR Tuscan - 1'22.9
2) Jony Ellis - TVR Chimaera 4.3 - 1'25.2 Rib
3) Peter High - TVR Chimaera 5.5 - 1'26.5 phazed
4) Trevor McMaster – TVR Tamora – 1’27.5 K4TRV
5) Anthony Bristow - TVR Chimaera 5.0 - 1'28.0 QBee
5=) Rob Pack – TVR Chimaera 4.0 – 1’28.0 Flying Banana
6) Steve Gullick - LS TVR Tamora - 1'32.0 SteveSPG
7) Matt - TVR Tuscan - TVR Tuscan - 1'40.2
8) Richard Cresswell - TVR Griffith - 1'41.4 AcidRich

[jesfirth]

phazed said:

jesfirth said:

Except yours looks a lot prettier! Did you make it yourself?

No, a friend had it made for a cerb.

I chopped it about and recently fitted it to my chim.

Hopefully it will knock a tenth off my time at Curborough

Sadly you will not be going fast enough at curborough for it to really work. My best speed in the griff over the finish on a single lap,sprint is 94 mph. My aero does not seem to take effect until I am over 70mph. It will work on circuits with fast bends though.

[phazed]

Point taken, the sprint bends are too slow.

Have you any more pictures of the rear diffuser?

I'm interested to have a go at making one at some time.

[jesfirth]

Hi pazed a couple of shots of the rear diffusers. I mad it out of 1.2mm aluminium sheet cut. The front needs to be flat and the rear is angled at about 10 degrees. I just reverted it together and then bolted it through the floor. The fins are splayed outward at the rear slightly at the sides to increase the exit speed of the air. The conventional wisdom says that you have to be able to stand on a spoiler or splitter because of the force they create. However it have had mine at 150MPH and neither front nor rear failed. I do check the mounts regularly though

Edited by jesfirth on Tuesday 3rd March 19:44

[Shezbo]

jesfirth said:

Hi pazed a couple of shots of the rear diffusers. I mad it out of 1.2mm aluminium sheet cut. The front needs to be flat and the rear is angled at about 10 degrees. I just reverted it together and then bolted it through the floor. The fins are splayed outward at the rear slightly at the sides to increase the exit speed of the air. The conventional wisdom says that you have to be able to stand on a spoiler or splitter because of the force they create. However it have had mine at 150MPH and neither front nor rear failed. I do check the mounts regularly though

Edited by jesfirth on Tuesday 3rd March 19:44

Sorry - the images of the front and rear "aero additions" within this post look very home made and I bet do absolutely nothing for performance? Air flow - is very high tech...you could actually be adding drag or lift?

[phazed]

Thanks for the shots Jes.

As for the comment above, I believe Jes uses the car for the Speed Championship.

I agree that aero generally isn't pleasing to the eye but it's all an experiment!

[steve-V8s]

Shezbo said:

Sorry - the images of the front and rear "aero additions" within this post look very home made and I bet do absolutely nothing for performance? Air flow - is very high tech...you could actually be adding drag or lift?

Aero is admittedly a bit of a “black art” and even the professional aero people tend to say an idea may work or probably won't work rather than give definitive answer without modelling it first. Having said that Aero under the car in basic terms is a bit simpler.

The less of it that goes under the better. If you can speed up the flow that is there the pressure will reduce and suck the car down a bit, or at least not push it upwards, then it needs to exit cleanly.

Luckily there tend to be a number of very capable professional Aero people wandering around the hillclimb and sprint paddocks, their advice is I would guess the basis for the arrangement Jes has on his very competitive car.

[Precat]

I have played around with aero and the difference over 100 mph is unbelievable. At 170mph ,with the roof down and aero my car feels very stable and planted. I wouldn't drive any other Griff that fast without Aero. All testing was carried out in Germany on an Autobahn.

The front splitter is home made and designed to counter the affects of the pressure build-up between the road and the radiator.
The rear diffuser is an SC Power item.

[Toma500]

How's about some sidepipes

[Precat]

Side pipes. Good idea



LS powered sprint car with side pipes and a flat floor

Edited by Precat on Saturday 7th March 19:50

[jesfirth]

Shezbo said:

jesfirth said:

Hi pazed a couple of shots of the rear diffusers. I mad it out of 1.2mm aluminium sheet cut. The front needs to be flat and the rear is angled at about 10 degrees. I just reverted it together and then bolted it through the floor. The fins are splayed outward at the rear slightly at the sides to increase the exit speed of the air. The conventional wisdom says that you have to be able to stand on a spoiler or splitter because of the force they create. However it have had mine at 150MPH and neither front nor rear failed. I do check the mounts regularly though

Edited by jesfirth on Tuesday 3rd March 19:44

Sorry - the images of the front and rear "aero additions" within this post look very home made and I bet do absolutely nothing for performance? Air flow - is very high tech...you could actually be adding drag or lift?

Shezbo. Phased and steve v8s are right. The aero does work-despite looking awful. The downforce created is quite significant and on a fast bend on the track makes a huge difference. The problem actually isn't the downforce it's the front rear balance or imbalance when you add aero. Getting front downforce could not be easier just bang on a big splitter. Getting the rear to work without a large wing which we are not allowed in sprinting is much harder though. It is all trial and error. The photos I posted are about the 4th version I tried. Once you have downforce your problems really start because you then need much stiffer springs to stop it diving under braking. I have just had to up my fronts to 700lb to control the dive. It's a never ending spiral. Interestingly the purple griff in the last photos belongs to a good friend of mine Matt who has sprinted in the TVRCC speed champ with me for many years. Matt actually had to reduce the size size of his front splitter to reduce the front downforce because regardless of what he did at the rear he could not get it balanced.

[77racing]

Hi Jez,

Two words for you to ponder now from car 77

" Vortex Generators "

Best of luck this season man, I expect great things from your aero package as I do indeed from my winter aero upgrades. My upgrades will break cover at Combe in a couple of weeks Easter Monday, I will keep you posted on lap times.

regards P

[jesfirth]

Perry. What have you done? Bolted a dyson to it to create ground effect. (-:

[jesfirth]

Perry. What have you done? Bolted a dyson to it to create ground effect. (-:

[Bluebottle]

I used to have a Zertec quad zorst on my car but the way it was designed it kept sagging each side. Got aero on my car these days so have a straight through system with two mufflers for circuit noise limits and also have optional straight pipes for noisy days
Got to agree with others that diffusers and splitters does have very positive effect on these cars (but only at track speeds)

[77racing]

jesfirth said:

Perry. What have you done? Bolted a dyson to it to create ground effect. (-:

LoL Umm food for thought. I did however play with the idea of using the spent hot air from diff and gearbox coolers hot air from boot ,mixing it with the air from the top of each rear wheel arch to blow the floor but Red Bull started to..................................

you will have to wait till car is at Combe to see the latest aero tests Easter Monday

This car inspired the thinking with spent air although I don't see this configuration helping much because I think it should be towards the midway/front of car not rear but I do admire the thinking from racers willing to have a go with idea's, not sure how the car went I think it was a sprint car.............

Edited by 77racing on Friday 20th March 09:17

[Precat]

Hamish
Looks like you have adjustable ARB?
How thick are there?

[7 TVR]

Precat said:

Hamish
Looks like you have adjustable ARB?
How thick are there?

You don't miss a trick do you