forged pistons and or decomp
 

bought a boosted car recently, went ver very well indeed!

was tiold the engine (vtr) had forged pistons and rods, breaking the car down today realised theses 2 head gaskets either side of what looks like a decomp plate,

whats the likelyhood of it having the pistons and rods? i think unlikely as the pistons alter the comp dont they alone?

stew

Id say very unlikely its got pistons n rods

Pistons with the right headgasket will be low comp enough

why would the person use 2 HG's and a decomp plate, id find it unlikely that it'll have the pistons could have rods tho only way to find out is to take the sump off

yes true lads,

one thing for sure it went well, very well. the car had been built in 2006 and lasted this long, the charged engine was miles quicker than my vts/cams/bodies!

i have no use for the vtr engine. i may offer it for sale as is, after all its handled power for so long etc, or i can split the engine and take a look to see what its got.

whats it worth as is? mk1 98 vtr engine was running 170atw! 200ish flywheel.

ive also got mf2,dastek, 5th inj, map sensor and some pipework for sale.

dont think many saxos built back then would have been forged, the cost of the conversion alone would have been stupid money back then, ppl used to use decomp regular back then going off other projects ive seen

you got dynos for that too mate ? figures seem quite high for a s/c vtr, most of them ive seen have been about 150-160bhp, just curious seeing as it was stil on mf2 :) not seen too many s/c vtrs, used to be really common as vts were daft prices back then aswell lol

it could of been forged andrew, mine was forged and had a decomp and that was in 2004

Oh I know Martin, but it's gmc built so I'd have thought John would match the pistons and gasket to the CR, so decomp and 2 gaskets I'd have thought no, but as you said, could still be, won't know without looking tbh

Is it a good idea to run a 2mm decomp with 2x 0.6mm gaskets off of gmc?

It would have to be running 1bar of boost to be significantly quicker than Stew's 'bodied 16v, which makes 150+bhp crank, it'd need to be up in the 170-180 ergion for Stew to say it's 'significantly quicker', so running a bar of boost IMHO giving it 180-200bhp crank

lads i was told the car was running just over 170, i presume atw? as its way quicker than mine, far more than 20brake. previous owner did not have any paperwprk with the car.

and the vtr it came from was a heavy full car with rear brakes binding as it was stood for a long time.

hang on a min there too, we may be talking bhp figures here but its more likely to be the torque thats a lot more than my bodies vts?

I was gonna say as I was reading my way through... Turbo is going to have a load more mid range where you'll feel like it's toasting your N/a engine. Peak power could well be the same, just the turbo has a huge slug of torque below that.

id iexpect a supercharged vtr on 150bhp to piss allover a bodied 16v making 150bhp(just comparsion figures)

the torque will be far greater, and come in much lower down the rev range :y:

more so with a turbo..

This is what pisses me off with people saying "ma car haz 150 hp from ph3'z", or similar. That's great, but there's bugger all torque 2000 rpm below that figure.

thats where turbos rule tbh :D

could boost a vtr on super low boost, making say 140bhp @fly with a nicely matched turbo for instant spool, if it makes 140bhp under 3k rpm its gonna smoke a 16v on bodies that makes 150+bhp at 6-7k+

its still gonna get more torque all the way through the revs aswell

wont forgies be dished?

yeah if theyre low comp but i dont know if hes splitting the engine to find out

its also possible that its running hi comps with a decomp plate to bring it back into the right CR

My thought tbh, cheap set of used high comps to take the heat, with a decomp to lower cr....

Should split and find out.

Was this the silver vtr that was on pistonheads for sale up near Glasgow? If so I hope you cut a good deal with the lad since it had been for sale on and off for a year

I did well thanks