RWD_cossie_wil

iTrader: (9)

What are the major factors in making a majorly grunty YB? Most 500BHP engines you see are around 450Lbs/ft, and the further up the power you go the more torque you seem to loose.

Is it possible to make 500Bhp and 500Lbs/ft on a T4 YB? Is it just a case of running a huge boost spike with sensible cams? Most of the other internals will be std items except low comp pistons

Stavros

on the whole...

boost= torque
smallest ports you can get away with= torque
mildest cams you can get away with= torque

RWD_cossie_wil

iTrader: (9)

so a T4 on std cams and a lightly ported head should get close to 500Lbs/ft? It's running 2.5Bar spike+ held boost , not had chance to get it RR'd yet.

Charlie Chalk

iTrader: (1)

What car will, Saph?

RWD_cossie_wil

iTrader: (9)

yes mate, the silver saph

Charlie Chalk

iTrader: (1)

When you looking at actually having this on the road?

RWD_cossie_wil

iTrader: (9)

got the head back yesterday, so should be back together monday and get it MOT'd and insured asap ...then wait for the 7" 4x4 diff to shit it's self since its not 2wd

Rod-Tarry

Is that a fact .

Mark Shead

Not a chance, With that spec you would be lucky for see 400 to 420ftlb,
The sum of a engine is just more than a small port head and low comp pistons, To get 500ftlb the engine will need to be a little more trick than that.

Mark

Lloyd

isnt the power and torque more about the volumetric efficiency of the engine?

RWD_cossie_wil

iTrader: (9)

What sort of areas should I be looking at improving then?

RWD_cossie_wil

iTrader: (9)

Rod, it's all very well on your spec engine, but I'm talking about a std geometry YB , yours is so far removed from a std engine its not really the same thing is it?

Stavros

Did you not see the mental torque and powerband his "normal" old T4 and 8inj engine made? Thats was summat like 504bhp and 540lbft if i remember right.

RWD_cossie_wil

iTrader: (9)

Thats what I was interested in Stav

Gatecrasher

Just tagging this as im quite intrested in the question and hopefully comming answers

Good topic

Fiecos Dan

My memory comes up with

@ 37psi boost, 492 lb/ft @ 4500 rpm, 504bhp @ 7000rpm

T4 and 8inj, but cant remember if it was a std stroke,bore or rod length.

Mark Shead

First look at cams stock are nice but they wont cut the mustard, Then IMO management but others will disagree.

Mark

GARETH T

i disagree totally, HOW will the management help make more power?

Daviet

did staffy not lose torque when he changed his managment
what type of torque did the old touring car spec engines make as they were apparently over 500bhp

Daviet

dont think kev sharp ever got a figure for his escort did he? as that must have had some power and was that not classed as touring car spec.
what torque does euans car make?

scoooby slayer

iTrader: (4)

have to agree i think its a total waste of money up to 500 hp anyway

Charlie Chalk

iTrader: (1)

Explain then please

rapidcossie

mines must make not bad torque as it was wheelspinning in the dry at 8k in 3rd today on way back from supercar day at KH

rapidcossie

second thoughts maybe its cos i still run the standard rear axle

Gatecrasher

Have to Admit im more intrested in what cams are Mark's preferd choice to get a Genuine 500/500 engine

In regards to ECU's making more power i know fuck all about it to be honest but at a stab in the dark would it be because you can map a car better on newer engine managment than you can on old style managment, so you get the best from the engine thus more power?

Good topic this

Mark Shead

Accuracy and speed of management and for it to make changes, This allows you to map closer to the edge over a wider band of engine operation.

Mark

Mark Shead

No he did not the prev graph was not correctly calibrated to his car.

Mark

Gatecrasher

So was i sort of right in what i said Mark?

XRT_si

iTrader: (2)

Interesting topic

Mark Shead

IMO yes

Mark

Mark Shead

The cam choice if affected by Head ports/comp ratio/turbo/exhaust manifold among other things.

Mark

glancy2081

does running a comp ratio of 8.0-1 as apposed to say 7.2-1 make more torque

Daviet

Deleted by Request

...firstly you wont be able to physically run 2.5 bar boost thru a lightly ported head...the max will be 1.5bar or its surge city..i know i tried it!

Gatecrasher

Doesnt your 500/500 engine run GT30 / 2wd manifold? dont know about CR or Cam Choice but i assume the heads pretty worked on

GARETH T

how close are you mapping to the edge then? do you think the L8/p8 isnt good enough, i cant remember the stats of an L8 but they aint that poor

scoooby slayer

iTrader: (4)

my head is nms middle of the road port size ie inbetween standard and touring car spec.

to stop surge im checking my msd mapping sheet now boost is capped at 22 psi > 4700 rpm, 25 psi > 5400 rpm and 32 psi >7800 rpm

i am certain ive lost some torque by doing this but i see it as a good thing as my gearbox and diff will last longer.

once u get up the revs abit the engine will consume it but 32 psi at 4000 rpm well boost gauge was fluctuating by 6 psi herific surge, a set or air injectors and a decent mapper will cure it

Mark Shead

Phil

I have just done a completly stock RS500 2bar boost at 4k no surge, Realy awsome bit of kit .

Mark

rapidcossie

scoooby slayer

Any plans for sorting the engine out so you can run to its full potential?