ttss4

I'm building a rally car based on a 99 uk model and i'm looking for around 250bhp,
is it possible using a 34mm ristrictor. got any ideas on DIY water spray or any other mod that would make the motor last a little longer.
I've got a scoobysport de~cat exhaust and the car came with a cone filter and a dump valve how much bhp will these items give me.

Thanks for reading


Ian.

P.s. I'm running on tight budgit so lots of diy mods wil be really helpful.

911

It should last for ages @ 240 bhp?
911

ttss4

Thanks for your reply,Could you tell me what the best way to get that power
out of my motor is.

mark@wrx

If you want it to last longer make sure it is mapped properly and don't use anti lag. Its a trade off of performance for reliability but, to coin a well known phrase, the choice is yours. My mate has the ALS on his STi6 at a relatively low level as he didn't want the expense of changing turbos every other rally. Still, with GEMS and a 32mm restrictor, the car is producing about 275bhp with 320lbs/ft torque.

911

That is killer torque!
911

ttss4

I've just bought a prodrive Group N ecu for a £50 but i know diddley sqot about the engine spec needed to run this type of ecu.
Also is it worth making a diy water spray kit for a rally car where it could be runing out of water every stage. Has anyone ever fitted a small fan on top of the ic.I noticed this on a shogun i repaired last week.

mark@wrx

Not compared to the newer cars! They are producing massive amounts of torque, high 300's at least.

DaveW

Prodrive base their GPN cars on STI JDM models, so I doubt that your GPN ecu would be suitable for a UK car (different internals and turbo). You'd probably want to think about getting it Tek'd with all your mods fitted and tell the mapper what your using the car for so they can map it accordingly. I'd suggest you speak to Bob Rawle as he has a very good reputation.

Graham,

Thats not killer torque, current owner of my old UK MY99 had it Tek3'd by BRD and got 330ft/lb

Dave.

911

So what torque will a TD05 20g deliver with Gruppe S headers and 3'' decat, 550cc/Walbro and Apexi FC?
Any 'real life' facts? I'm keen to know as a 6 speed box feels like a good idea...
911

madou

911

Google "MRT Discussion Forums - My dyno run TD05/06-20G" by Denmark ( Skassa )

link to google cache version, mrtrally.com is not serving this page at present

http://64.233.183.104/search?q=cache...ient=firefox-a

dyno graph

http://img14.photobucket.com/albums/...k/2370888c.jpg

Do you have the six speed box on order ?

911

NO!
911

ttss4

Thanks for your reply guys,
The ecu i've got has a standard subaru sticker on it,here are the numbers on it,

J2 (large letters) 22611 AF041

Is this an 99my sti?????

Vauxhall Vixen

Can probably help you here....If you can run to race fuel (Carless turbo Ultimate @ £2.60/ litre) then although power will still be limited to circa 250-270 BHP (as all GP N cars are) torque can be as high as 350 -380 ft lb.we typically use a VF34 turbo as these have proved able to take a reasonable amount of ALS. Typically 0.5 - 0.9 Bar off the line and 0.4 bar on overrun. If set up properly the ALS is not hard on the engine - there is boost but no torque - but obviously turbo life is limited.The car I have run this year (2nd in class B13 in National Tarmac Championship) is running 1.6 Bar peak with no servo and quite agressive ALS, and develops 425 ft lb torque, but the engine has done 20 + events with no problems.Turbos we rebuild every 6 events.

If the fuel seems to high a price to pay, then the Shell 101T is a good alternative.Failing that, good old optimax will normally get you into the 320 ft lb region with a good turbo.

You obviously need a mappable ECU for all this...I run GEMS....give me a call on 07836 635001 if you need any help on this and other bits.

Steve Simpson

911

Thanks Steve.
How do you get 400+ lbft? Must be more than just mapping,als,fuel?

I've driven an RA you mapped and it was full of torque, very different to my stock Sti at the time (Rob Walpole's RA).
911

911

Madou, 452 Nm...!
What's that in lbft? The torque curve seems 'substantial', ie tall and flat.
911

Andy.F

Race fuel will allow massive torque figures in comparison to omax, as Steve mentions the difference can be from 320 omax to 425 race fuel, just from a bit more boost and mapping mods.
453Nm is approx 330 lbft

Andy

steve rally

That's right Andy - but on some of the engines in the hire cars we have tried different Compression Ratios....The car I mentioned earlier is running 10.5:1 CR with GP A cams and water injection.With std CR and cams you are nearer the 380 ft lb mark depending on what peak boost you can get - the restrictor design has a massive impact on this.The current design requires the turbo to be slightly rotated so that the "trumpet" can clear the inlet manifold.

Steve

mef

ttss4,

I have fitted a home made alloy water tank in the boot, capacity is 15 litres, it works well, the little washer pump provides a good i/c spray from the standard nozzles, the pump is switched automatically by the GEMS with boost & inlet air temp. I have a large Sti8 TMIC with a home made alloy air duct & splitter on top to force the air though it. VF34 turbo is used with a "long" 34mm tapered restrictor. All works well, 2nd O/A on the rally at Anglesey last Saturday until a gearbox problem, not sure what yet, think centre diff problem.

Martin

911

On hill climbs there are NO restrictions on the induction system, carbs to injection non turbo to turbo (as long as the multipier put you in the right capacity class) etc.
My car has/will be running no restrictor at all except the stock Panel filter/MAF restriction.
Would you get more torque from the engine with a 34mm restrictor, or is as open a system as possible the best route?

Andy, I have an Apexi FC + Commander now, awaiting you to fit in Jan 05, can I reasonably use the Commander to adjust the map at the track (having driven to the meeting) for race fuel? So, if I had a separate small tank/pump just for hill climbs I can make the most of the 'features'.
Can't go for an Apexi AVCR, but have a 3 port sol'd.

Think the wife is fed-up of the spending spree I've had!

911

911

Mef, don't suppose you would send a pic of the Sti8 TMIC and the ducting on top of it?
911