Deleted by Request

...mark..how could you run that boost thru a std head? ...1.5bar thru mine max...scooby slayer has confirmed it too

Scooby slayer yes you can control it out but isnt the engine just a massive compromise?

Mark Shead

Phil

No surge it had full boost as soon as the turbo made it, This was the first 500 like this I have done the only diff from stock Exhaust and Autronic, 750cc injectors running 75% duty at 6.5k.

Mark

scoooby slayer

iTrader: (4)

im pondering on trying a different inlet manifold. i dont know what the restriction is either inlet or head or both

but to be honest once im in second gear if im going for it and reving to the top she doesnt drop out of 32psi anyway so i dont really notice it.

even stu commented how good a road car it is the gentle power increase helps to stop wheelspin and it has traction problems now in the dry in second.

so basically i dont think i can gain much more power maybe 20 - 30 bhp tops, but i can gain gearbox and diff breaking lowdown torque and is it worth it

Jay,

iTrader: (4)

so the enigine is totally stock then mark ?

Deleted by Request

..so mark your saying autronic sorted it? ..or does the rs500 run a different head port config to normal yb's?

scoooby slayer

iTrader: (4)

not really a compromise imo caped boost helps prevent wheelspin and then once ur going like driving a 2 stroke motorbike just stop in the powerband which you can do from 2nd to 5th. and even with the boost capping im still making 380 hp and what use is anymore than that in first and second gear

and when its wet i can overtake in fourth with my foot down and 380 hp instread of wheelspinning 470 hp works well imo would be more fun at its full potential but less use as a road car in reality

Deleted by Request

...very true infact!

..my XKR deals with access power via traction control

Jay,

iTrader: (4)

very good point

rapidcossie

I had my car out today in the wet up to knockhill and just use the accelerrator pedal to limit the boost to stop wheel spin

When the road dries up you can hit 2.5 bar at 4 thousand revs, it makes it so fast for overtaking in and out of other cars.

scoooby slayerbeing 10 psi down at the lower revs you will be way down on power compared to what it could run.

Deleted by Request

Rapid....in 1st 2nd you cant use that boost..lol

rapidcossie

its hard to use in 3rd to but when it hooks up its mental...

the midrange on my car is awesome

Deleted by Request

...but youd get wasted by a stage 3 4x4 on the road thru b roads..THATS where its at mate..not this str8 line shit

rapidcossie

i wouldnt mate i can assure you of that

Deleted by Request

..unless you come across an equally mental driver

rapidcossie

Im defo not a mental driver but I did have to stop myself today on the back road to Knockhill....I was chasing my mates 911 turbo on a muddy road and I had double speed wipers on cos of the rain

Daviet

dont think euans a mental driver his car is just mental fast lol

scoooby slayer

iTrader: (4)

i can see what ur saying mate but from second to fifth i dont drop below 5400 rpm anyway so in reality im not loosing a thing. only if i try to pull from lower down the revs then i havnt got all the power i could have. simple answer to that though mate change down a gear. like if i wana overtake someone doing 70 i just drop her in 3rd and bang instant 470

i have plans in the back of my mind for 600 hp now that would be worth pulling the head of and spending some money. but we will see if i get bored or not

RWD_cossie_wil

iTrader: (9)

Which is what makes a nice road car IMHO, great having a big fat torque curve, no point in having 600 BHP for 1000 revs at the top when you can have 450+Lbs ft across 4000RPM and a huge flat power band

Rods graphs on the first page are an example of what makes it such a mental engine, its making std cossie power and then some just after 3000 RPM . Can only imagine how well that pulls, and rapidcossie, I imagine your engine is pretty damn special as well.

The traction issue is one that you could talk about forever and a day, a decent rear beam and a set of danny B's frame connectors should be a good starting point, which is what I will be aiming for on both of my cars

But back to the Torque conversation, anymore tuner input would be most welcome, this is getting interesting

rapidcossie

I know I 100% need a rear beam to get the best from my car but its something i cant afford just now..

My car is actually pretty good up a back road cos you dont need to rev it very much if you dont want to...

It destroys most things without even taking it back 6k

was revving abit harder on the run back down from Knockhill but the convoy I was in consisted of my mates 911 and my other two mates on their 06 plate GSXR600 and ZX-6 ninja

Daviet

euan have you got you latest graph when it made 505bhp to see what torque it made must be well over 450??

rapidcossie

I dont have the graph as a print out mate...

AVA rollers doesnt measure torque in a way that easily recognisable so I dont concentrate on it, I leave to Alan to mess around with.

scoooby slayer

iTrader: (4)

thats the thing you dont have to thrash ur engine to make ur horsepower whereas i do

anyway did just look at that graph of rods engine and that is a massive torque curve torque on a cossie normally spikes then disapears from the graphs ive seen

rapidcossie

Surely Karl must have known this when he built then engine?

Daviet

no probs euan
when i had a graph for my old s2 and worked out the torque from my graph with the formula it seemed pretty much inline with what it should have been

rapidcossie

the calculation doesnt work with power at the wheels figures

Daviet

why not? surely it would just give you a torque at the wheels figure or am i being really thick

rapidcossie

Your asking the wrong person davie as I have no clue

Daviet

bad as each other

NEIL A

iTrader: (6)

Euan Diva has rear beam for sale for a ok price, im thinking about it myself. So where is your car making full boost now, 2.5 bar spike must make some decent torque.

Karl

Just to clarify, I did'nt build or port the head in Scooby slayer's car. All work was done by Alan himself (previous owner). As such I actually have no idea what's in alan's old engine other than what Alan told me. Think its on BD14's with cleaned up standard port head.

puddy

Back ot the original question about torque,I understood to make better

torque,a standard bd8 exhaust cam and a bd 14or16 inlet with the

appropriate cam timing was effective.

Also,were,nt the escos wrc yb's high comp to make higher torque figures

as the turbo's ran restrictors?

puddy

scoooby slayer

iTrader: (4)

so what is it alan owes alot of money for then ? as when i spoke to ollie about mapping he wasnt to happy that alan had sold the car and nms hadnt been paid ? it wasnt for mapping as that wasnt done anyway and i got the jist it was a fair amount of money
infact it was ollie that told me the head is your and i quote (middle of the road spec head) ?

doesnt matter either way engines great

RWD_cossie_wil

iTrader: (9)

Why would restrictors allow a car to make more torque? I think you got the wrong end of the stick there mate, they made the car as torquey as possible as due to the 34mm restrictor the airflow for more than 300ish BHP is non-existant

puddy

No,that was my point ,they couldn't make big hp because of the restrictor,

so they ended up as high torque,huge amounts of boost I am led to believe.

puddy

ps. I think I'm right about the small exhaust cam though

Staffi

iTrader: (1)

But i'm only peaking @ 27 psi now, it was 35psi

Daviet

if you read the rest of the post you will see it wasnt actually to do with the boost acording to your mapper it was an incorrect reading
and your right.i couldnt give a fook about number either

Staffi

iTrader: (1)

I did read it but i've just come back off holiday and i'm fucked nothing is registering..


Mind you, i think my boost gauge is dodgey aswell, it feels stronger than 27psi

Mike Rainbird

iTrader: (3)

If it's NOTHING to do with boost, turn it down to 30-32psi and see what torque it makes then .

Big boost = big torque, without the boost spikes, you don't get the big torque spikes.

bud-weis

I've got 3 different graphs from different RR's...they can't all be wrong surely??

Weston Performance
Powerstation
Re-Worx

all gave roughly the same reading from memory

not that it really matters lol...