2wd cossy, 320bhp, rear spring rates...turbo lag

2wd cossy, 320bhp, rear spring rates...turbo lag

Author
Discussion

john.stuk

Original Poster:

24 posts

228 months

Sunday 5th February 2006
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I sprint a 320hp 2wd saphire cozzy. Anyone played with spring rates. On the track I use 250 lb front and 350 lb rears. I am told the rears are too stiff from fellow competitiors. Thing is I dont get axle tramp off the line but I am not sure I am 'loading up' the rear under acceleration. Before I blow a small fortune on tyre testing can anyone help?

Oh! TURBO's....Lagging a bit on a standard turbo. Anyone understand anti lag...I cant do the left foot braking thing. Holding the revs up heading for a grassy bank kind of takes my concentration. One or two competitiors have anti lag systems...dont know how they work or if I would want one. Please help cut the bull s**t for me...

cptsideways

13,648 posts

259 months

Sunday 5th February 2006
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Hi there

For sprinting I suggest you'll need traction off the line, in which case you'll want softer springs, get someone to video your launches & then see what the car does. If it does'nt squat much its not going to get maximum traction. Take a look at some of the super fast road based drag cars & you'll what I mean. I'd suggest with sprinting the launch is one area where a small improvement makes a big difference.

I'd suggest do some testing, The rates you quote are super hard I'd say, put some boggo springs & shocks on the back & see what it does, I think you'll be surprised!

As for lag I take it your running a T3? in which case you'll have little power or torque below 4k yes? They run into this problem on the 4wd cosworths in rallying, the big power cars T3 or bigger are REALLY slow off the line as you can't break traction, you get little or no boost without a huge clutch slip type launch. They are never quick off the line unless you sponsored for gearboxes etc!!

Anti lag won't really help those launches in my limited experience, but a smaller T25 turbo will help enormously. Go & try someones standard 4x4 small turbo T25 Escort & you'll see what I mean.

john.stuk

Original Poster:

24 posts

228 months

Monday 6th February 2006
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What a great idea, video...will give iot a go. I have AVO coil overs so swapping springs is easy. AVO suggested the rates I am using which are great for high speed cornering. I did think of using a kind of helper spring that gives a progressive increase but swapping whole springs costs about £40 a pair. Will try standards first.

Turbo is T3, and boost is 24psi at 3500 rpm. I seem to remember some of the escort cozzys had a smaller turbo, will give PJ Motorsport a call as they always seem to have plenty of recon bits about them. Thanks for your comments.

john.stuk

Original Poster:

24 posts

228 months

Friday 24th February 2006
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Fitted 180lb springs on rear, 350lb on front...what a fantastic improvement.

chuntington101

5,733 posts

243 months

Friday 24th February 2006
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have any of you cossy guys thought about getting the t3's converted to ball bearings????

its become a popular convertion for the Evo guys and really works well! or has anyone tried fitting an Evo turbo?????? they are good for about 4-450bhp and with BB will spool up qickly!

also haw about a new exhaust manifold?? they are said to reduce spool up and give a little power to. also what about cams??? can you run higher lift (helps get more air in and spool turbo faster)?

how about water injection? then you can run more advance which will help get the turbo running earlier and let you run a little more boost.

i know some of these are a litttle strange but you never know right?

Chris.

john.stuk

Original Poster:

24 posts

228 months

Saturday 25th February 2006
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subaru's earn great respect but the old cozzy tends to be better....except for the evo 5 we compete against that wins everything, cost 40k for his engine. mine owes me 5k for the whole car! value for money i think.

manifolds are short with little options available off the shelf. 360 degree bearings work well in turbos. The thing with rs cosworths is that they use very old technology ecu's.

Need emerald or megasquirt to run many of the ideas you listed.

And my best friend suggested going on a diet to make mine quicker...

cptsideways

13,648 posts

259 months

Saturday 25th February 2006
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Having just set up the geometry today on a 450bhp cossie 2 door & road tested it, I have to agree that 300ilb rear springs are USELESS for rear end traction. The thing had no squat so the tyres just lit up way before any accelaration appeared.

Softer springs

chuntington101

5,733 posts

243 months

Sunday 26th February 2006
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yeah i guess so john. its much easier to spend other peopls money than your own right???

weight reduction will help no end. i mean if you put the engine and running gear into a Dax Ruch i think you ould go much quicker!

is sawpping to an emerald out of the question?? they are good ECUs so i hear. and they might let you run anti-lag!!!

i stil think that a BB convertion for the turbo would be a good idea. or a ball bearing turbo such as the Garrett GT30R. should be able to get one form the states for a couple of $K (a little over a grand).

Chris