Anonymous

What sort of lbs/min do you think a standard T34 escort cossie turbo is capable of flowing at around 1 bar of boost?

Not into a cossie lump, into half a 7.2 litre V8

Thanks in advance lads.


Chip

Karl

For a 7.2 BBC you should be thinking about a pair of RS500 spec T4's. This is because you will need a turbo of this size to keep the engine VE high as the rpm rises, else you'll end up with a very unrevvy engine!

Anonymous

Thanks for that Karl.

To be honest we will probably end up using a single turbo (GT60 maybe?) but as i have found a source of a couple of new T34s at a good price i thought it might be worth considering those if they were suitable.

We're only looking for 1000bhp (140bhp per litre or so), its nothing majorly hectic so shouldnt need too many rpm anyway.

Karl

I would'nt go for one turbo for 1000bhp, I'd personally use a pair of suitable turbos such as a pair of GT35's.

Anonymous

What would be your reasoning for not wanting to go for a single turbo?
Ive never been involved in anything of that size before, so i have limited knowledge on the subject.

The inlet manifold only has a single entry point, but we could "Y" that easily enough for two turbos.

Is a GT35 happy to flow about 45 lbs/min at a bar of boost then mate?


Thanks very much for your help as i realise im a LONG way off topic here on a ford forum, but passionford just seems to be the best place to go for pretty much anything automotive!

Fudgey

iTrader: (4)

only 1000bhp

Anonymous

LOL, its all relative mate, its like on the mini forum i use, they think 100bhp is a big engine

Where as to a yank v8 7.2 litre turbo (or twin turbo as suggested by Karl) engine 1000bhp is a walk in the park, the thing used to make 750bhp N/A when it was running more compression and a hotter cam, and even now at 10:1 CR it will still make 550bhp+ N/A
So 1000bhp isnt really a very big increase

Stavros

Mate, for turbo V8 advice n info, there only one place to be---

http://www.turbomustangs.com/forums/

dont be fooled by the name either, its all kinds of cars, not just mustangs.

they will tell you everything you need to know and then some

Fudgey

iTrader: (4)

well, if you put it like that no, i guess its not.

whats it going in mate???

the nova?

do you work on cars for a living or just for fun mate??

your not far from me either, got any jobs going??

Anonymous

itsmeagain, thanks for that mate, ill give it a look.

Anonymous

Not my car mate, its going in a Jag XJ12, its a mate of mine, he does this sort of thing for a living (one man band, doesnt employ anyone else), in terms of engine conversions (mainly stuff like Audi's with 400bhp 1.8Ts and things like that) but this is for his own car, and he hasnt got any real experience of v8 turbos, only supercharged ones.

I dont work on cars for a living, its just a hobby for me.

Fudgey

iTrader: (4)

cool, what sort of stuff does he do to the audis??

me old mans got a A4 1.8T

he was asking me about chips etc and i found some info from usa that to get 400bhp out of them all you need is bigger injectors and new managemanet??

dont spose you could get any info on what he does and how much etc?

cheers bud

vroooom ptssssh

Suerly u wont know what boost it'll run untill u got it on a RR and are setting it up?

Anonymous

Not sure i get what you mean there mate?

If he is aiming for 1000bhp on a motor that runs 550bhp N/A then its going to need in the region of just over a bar of boost or so to get him into the right ballpark.


Fudgeass, i dont really know a lot about exactly what he does to the 1.8T to get those sort of figures, he as one at the moment though (in an A4 funnily enough, its a customer car, should be finished in a couple of months) if you PM me at the weekend to remind me (i work away from home during the week and dont see him) i can get some details off of him.

I do know its more than just a change of injectors though, he uses aftermarket management, a bigger turbo, and different internals as well, i believe that for about 300 you can do it on a more or less standard engine though, personally i wouldnt bother though in an A4, i would just sell it and buy an S4 instead, rather than tune the nuts off such a little engine!

vroooom ptssssh

well i thought when mapping a car you set it to whats best for the engine not what u reckon it will need? boost dont neceserally mean bhp as u probably know, it may get to a certain point where theirs no point running any more, but cant c that happening with just 1 bar im just talking shite no ament i ok i'll leave

Anonymous

You're right, you tend to hit a limit, normally cause the turbo is off its compressor map and starting to get ineffiecent, or cause the engine CR is too high to accept any timing at that boost level, or a combination of both.

It shouldnt be an issue here though, he is only pitching at the same level of tune as a 280bhp saph, it just sounds a lot cause there is a lot of cubic inches involved!

He will be down to 8:1 CR by then as well, if he was trying for 1000bhp on the current 10:1 CR i should see your points possibly being an issue, at the very least he would be running hardly any ignition to be safe at a bar of boost on 10:1, but he wont be doing that, he wants to install it as it is, and then see if he thinks the chassis and running gear can take any more power before he rebuilds it at lower CR.

If he goes 8:1 then potentially he could get 1500bhp out of it, but he isnt after that, he is after moderate power and reliable, a set of 285 wide street legal tyres are going to struggle on 1000bhp anyway TBH

ImaRacing 700

Change "we're" to "My mate"

Thought you said you was a fully trained mechanic with several degrees ...So the Mini with 500bhp is actualy your mates to.....i fear we have another Rainbird/ Harvey scenario here

Anonymous

My mini belongs entirely to me, in fact i started building it before i even knew this friend of mine, and im not a mechanic by trade and have never claimed to be, my degree isnt anything to do with mechanics, its software engineering based.

I help him with his cars, and he helps me with mine, cant see the problem in that, hence its a case of what "we're" doing, but ultimately with my cars its my decisions and with his cars it his decisions.

Anonymous

PS

"Fully trained mechanics" know how to remove and refit standard parts from a car, they dont know anything about modifying engines as a general rule, my ex mrs is a fully qualified mechanic but i still know far more than she does about modifying engines as ive got a lot more experience of doing so than she has.

AlexF

SOOOOOOOOO true!

I should know... I teach them their qualification!

alex