xr2i-carl

Can ti be done? had a discussion today with a guy who rekons big power turbo cars are ALL undrivable. I cant see this being the case tho..

Surely with modern systems like omex and with anti-lag systems a decetn 500-600bhp cossie can still be driveable?


Carl

Chip

iTrader: (3)

500bhp isnt a big turbo in the views of a lot of people.

500bhp is perfectly possible to have driveable, Rod Tarry's first engine spec being the perfect example

C4llyT

What size turbo is on the 6.75 litre Bentley thing?
Local garage building a YB had that stuck on it, reckoned boost would be in nice and low.
Why my mates wasn't on standard cossie they'd serviced I don't know...

xr2i-carl

ok chip what about 700+bhp cosworths, can they be driveable?

Cally the bentley 6.75 litre push rod engine has two turbos. Big fuckers...

Martin-Hadland

iTrader: (2)

I can answer that.... Yes!

C4llyT

I'm sure with todays technology, and enough money, you could make a 1000bhp as drivable as a Focus.

xr2i-carl

Hi Martin, when does your boost come in?

do you have a graph to post up?!

Carl

luke89

iTrader: (1)

even with rods last engine ( the 206mph one ) im sure he used to drive it to and from work

Chip

iTrader: (3)

I would say your car isnt what most people woudl consider road driveable, mainly for reasons of the clutch and gearbox, but obviously you could put it on a T56 or something to get round that.

whats it like for economy?

(NOT trying to be clever, I suspect the answer will actually be a lot HIGHER than most people think)

Karl

What do you mean by undrivable?

A BIG bhp engine will never produce boost as early as one fitted with a T3, but in terms of perfect road manners, YES a big bhp engine can drive perfectly. (i.e. like a std engine does)

The biggest issue with big bhp engines is that they are usually later coming on boost and hence have to be revved harder to extract their power, but that can hardly be called undrivable.

Remember a lairy turbo engine is actually quite a mild engine once the turbo is removed from the equation and unlike a wildly tuned N/A will always be civilised as a road car. (i.e. C/R, cams and cam timing will not be outrageous as you would find on a wild N/A engine)

Kevin Sharp

iTrader: (3)

funny that...the 93 bentley continental i had through my hands last year only had 1

soooo many questions....bored?...school holidays is it?

xr2i-carl

I was talking about the arnage T later ones.. Early ones had a single t4!!

later ones had 2 x t3!

NEIL A

iTrader: (6)

Westy

iTrader: (1)

is Daddy thinking of buying you a Big BHP Cossie Carl..?

C4llyT

Would have thought you guys pleased a thread about Fords rather than BMW's

Rod-Tarry

Soon I may be able to answer yes to a 1000bhp being drivable, certainly 900bhp was OK with no problems.

rapidcossie

I have 550 BHP with what could be called lairy cams, silly big injectors and an old truck turbo yet it comes on boost nearly as well as a T3 and has an awesome power band.

Proves it can be done with a little work.

NEIL A

iTrader: (6)

Euan do you have any graph's of your new set up with the new turbo and airbox fitted.

rapidcossie

I dont have any here in the house Neil but I know I need to get some up

NEIL A

iTrader: (6)

Was just looking at the ones in your forsale post for the old T4 and it does look like a big power spread which would be useable.

rapidcossie

On the old spec it made 90 bhp at 3k.

New spec it makes 170 bhp at 3k, kinda shows the difference

these figs are at the wheels and ti might be more bit I will have to check

col cos1

iTrader: (5)

euan how much would this new turbo cost

pm if you like?

Kevin Sharp

iTrader: (3)

[schoolteacher mode on] explain yourself more clearly then boy[/schoolteacher mode off]

rapidcossie

new one is 1400 plus VAT I think.

but you could sell or get your own T4 converted so it aint that bad

col cos1

iTrader: (5)

does alan have to tamper with it aswell or is it a straight fit as is

Stu @ M Developments

iTrader: (12)

Of course they can. Your mates is ill informed.

Interestingly, and anyone who has had a live map by me will confirm this as i usually make a point of it during the demonstration, One of the tests i do when mapping is almost finalised on an averagely high powered YB such as one modified with 83lb Siemens, Ported head, sensible inlet cam, T4 or GT30 turbo (Or of course anything lower powered) is to tune the calibration enough to ensure that 5th gear can be selected at 30mph and then driven round town or accelerated from there to its rev limiter with no hesitations or sudden changes in power delivery.

If it cant, i wont give it you back until it can, even if that means delaying the return of your car.

Edited to add, this is all with its 20yr old Ecu of course. Results vary on aftermarket as some arent half as good as the OE one but thats no fault of the mapper.

rapidcossie

fits exactly same as any other T4 col

col cos1

iTrader: (5)

no mate i mean does alan have to port/modify it in any way before fiting on car

xr2i-carl

(skool boi mode on) http://en.wikipedia.org/wiki/Bentley_Arnage check out this link, it explains everything

(skool boy mode off)


Carl

rapidcossie

No and yes

pete mcrash

iTrader: (1)

[quote="Stu @ M Developments"] is to tune the calibration enough to ensure that 5th gear can be selected at 30mph and then driven round town
.............ohh the noise it makes in a shitty 4x4 box...............sorry i'd have to drop a few cogs.............

Butch.

iTrader: (1)

mechanic28

iTrader: (5)

ask 4x4ste or cossierich about how the 530 bhp cossie is to drive that stu mapped

James-W

it could, infact it could even have a t3 turbo

that doesnt mean to say its driveable. the owner might not rev it hard enough to produce any boost on the way to work

Stu @ M Developments

iTrader: (12)

However, everyone elses 4x4s are just fine.

4x4 ste

iTrader: (1)

My old 3 door isnt the best to compare tbh, as the box had a long first gear and a slightly shorter 5th. But as Stu said we did do that test while mapping the car 5th less than 30 mph to the limiter.

And for town driving really it was ultra drivable as you only used 1st gear up to 70mph

That was T4 bd16 and bd14, 27 / 25 mm ports iirc and 7/2-1 comp.

However i feel clutches is more where you would want to look at as a std cable clutch is the biggest downfall not the engine power.

Steve

Edited to say : on L8 too

twoblacklines

Judging by my focus, you really wouldnt want that

pete mcrash

iTrader: (1)

..........i am on my fourth in just over a year.......... .......

Crowder

Was thinking the same maybe his dads buying an escos?

xr2i-carl

Nah daddy has those sort of cars when they were new, decided on the intergrale evo tho instead of the escos in 1992

I am just interested as i always have been about these engines.