yhe chod

i have a scooby with ppp my99 .whats the best mod for massive torque keeping the drivability of the car for everyday use.im looking for more power bellow 2000rpm

harvey

iTrader: (48)

Not easy to get power that low down.
Depending on what model you have it will start to get up & go from 2500rpm to 3500rpm. A good de-cat exhaust & D/P will allow power to come in 300 to 500 rpm lower.
Hope this helps.

muppet paster

Nitros,
nitros,
nitors,
nitros,
nitros,
then maybe, if you up for it,

conversion to methanol?

Or just ditch **** loads of weight.


Nah, nitros, the true path to enlightenment!
sqeak-sqeak

muppet paster

**** , what's all that about?

i meant to say S-H-I-T, BTW

yhe chod

THE PPP CONVERSION IVE GOT INCLUDES CENTRE AND BACKBOX MINUS ONE CAT BY PRODRIVE IDONT THINK THEY TOUCH THE DOWN PIPE. I THINK THE DOWNPIPE IS THE ONE TO REPLACE TOGET MORE POWER WITHOUT FUEL ECONOMY PENALTIES -WOULD A FALKLAND DOWNPIPE GEL WITH THE PRODRIVE SYSTEM OR WHAT DO YOU THINK? ALSO WOULD A UPGRADED AIR FILTER HELP.

TonyBurns

iTrader: (3)

You have a few options on downpipes really, most go for the scoobysport one as its a 2.5 inch but you should try the scoobymania one which is a twin dump and a 3 inch to boot also sounds very mean when fitted (like it is on my MY00 PPP'd car )
The only down side is that you may get overboosting, this can be sorted by making the hole in the little brass restrictor larger (see John Banks for details as this tech stuff baffles me lol! )
Hope that helps

Tony

Hoppy

For 'massive' torque you'll need a new ECU and some clever mapping, but big power at 2,000rpm is asking a lot.

Check the dyno pages (click top right of screen) and you'll see hundreds of power runs with details of mods. At Power Engineering, Sunil Patel (come back Sunil!) got an astonishing 319lbs/ft at only 3,030rpm from his UK99 with a Link ECU, so it can be done. However, the shape of that torque curve is the weirdest I've ever seen and doesn't look very driveable.

Richard.

Mufasa

Nitrous is a wonderful thing, but you don't want to be dumping in large amounts (75+ bhp) at low revs, it sends cylinder pressures extremely high for an over extended period leading to possible piston or rod failure. This is made much worse if you 'hit the button' in a high gear....I have heard of it being used as anti-lag, but it's not the best use of it IMO, and you need a bomb proof engine.

Far better to dump it further up the rev range where the engine can accelerate more freely.

None of this is gonna be cheap, but I reckon the options depending on how much you want to spend are:

Expensive nitrous system using progressive delivery.

Higher compression ratio and a smaller turbo for earlier spool up, so sacrificing top end performance....

Swap the turbo for a supercharger, again possibly at the expense of top end performance.

skiddusmarkus

Is a Falkland down pipe otherwise known as a sheeps ****?

RB5SCOTT

The Scoobysport is a 3" downpipe that tapers to 2.5". 3" systems generaly lose torque but gain power

Scott

muppet paster

i have a scooby with ppp my99 .whats the best mod for massive torque keeping the drivability of the car for everyday use.im looking for more power bellow 2000rpm


Er, have you considered a diesel?

Just a thought...

check please

john banks

Impressive pull from 2000 RPM is possible without nitrous. 50-70 in 5th takes about 5 seconds on my car at present (recorded from speedo 53-73 to correct for typical speedo errors, done in two directions several times). You will note that this figure beats the vast majority of 50-70 5th magazine times, including diesels and a fair bit of exotica which is high revving. This is from 2000RPM at which it makes about 10 PSI boost. Standard car takes over 8 seconds to do the same increment. It doesn't feel really fast until 2500 RPM, but it does move from 2000 RPM like a standard car would about 700 RPM later. I am not hitting the surge line on the turbo from the feel of it or on the compressor map.

A boost controller (electronic or manual = Dawes) and a decat downpipe (any will do) added to your PPP and set to 18 PSI will do the trick nicely I also tightened the actuator on the turbo, but this makes a difference to boost taper from 4500-6000 RPM - still running 14.5 PSI at 6000 RPM. Holding 18 PSI 2300 to 5000 RPM. (Std car 13, PPP 16-16.5). There is plenty of fuelling, it doesn't knock. The intake temperatures on track do climb over 17 PSI after more than 5 laps of Knockhill, but this happens on some standard cars also. For road use 18 PSI seems quite a good level before the turbo just pumps hot air.

Beware some induction kits will make worse a lean spot low down which although not dangerous will rob you of the low down torque you seek.

Even if you don't want to up the boost a boost controller will give you a wider boost curve. A downpipe is strongly recommended whatever.

If you want the thing to pull smoothly from 1000-2000 RPM buy a V6. If you want it to pull smoothly and hard buy a V8! If you can wait until 2000 RPM and don't mind it sounding crap until 2500 RPM stick with the Scooby.

[Edited by john banks - 3/30/2002 11:01:58 PM]

harvey

iTrader: (48)

Total de-cat.Went for 3" Revolution on my STi v6. £510 fitted IIRC inc D/P. VERY happy with result.On power 300rpm earlier @2700rpm.
IMHO it has to be open neck as opposed to twin dump.
K+N pannel filter will give slightly better breathing up the rev range but will not help low down torque.
Short of spending a lot of money power below 2000rpm in these cars is just a dream. They are not designed for it but have other qualities.
Might be better to start with a 2.0 16v GTE Vauxhall if torque below 2000 is the first criterion or change your driving style & enjoy the Scoob.

harvey

iTrader: (48)

P.S. Have a modified Revolution D/P for sale. Less than 2mths/2000mls use. Replaced original Revolution with modded pipe then did same mod to this.

harvey

iTrader: (48)

Just read J.B.s post which must have crossed with mine.
In addition to what I said I agree that a Dawes from Performance Exhausts on a U.K. car would help greatly but I must stress these cars are not intended for torque below 2000rpm. As John said that is V8 territory.

harvey

iTrader: (48)

Nitrous is not an every day, take your Granny to the shops option. More for having in reserve for the odd occassion you want to show it.