He mates,

I was wondering what the maximum amount of bhp is that you can run on MFI, when you will get problems with fuelling? when will it detoned? i don't want to buy any more stuff for more bhp after this. So still standard pistons and conrods. So i was wondering what i could run...

what will be my next limit and max bhp running this:

engine just had complete re build with all bearing ect.
APR conrod bolts
Flowed head
285T cams set
oilcooler
*looking for a intercooler
*looking for a chip


Turbo:
TOB32
T03B as
360 degree bearings
small bronze bearings
exhaust house .48
inlet housing Z32 + compressor wheel
new backplate
-31 actuator

Cosworth fuel pump

 

mine ran 240bhp on mfi with a 5th injector after that i reckon its cossie management for mine

your spec should be getting you around 180-190bhp after its chipped and you get a good cooler but to be honest every car is diff so best get it on the rollers for a acurate reading

 

Did you ran std pistons and conrods aswell? And how much psi were you running? what will be limiting me @ 180-190 bhp?

 

is your cam a 285 T or T2 because a piper 285 T is a mild cam they dont like to have boost running anything past 15psi, i'm sure the mfi can push out 250 brake easy with the right mods

 

can anyone remember sevenvally's s2 rs turbo's the balck & grey one i'm sure they both were on mfi & one was running 320 brake.

 

it's a T
i didn't had this big plans in the beginning

but i bought it from berry rst incl a flowed head for a nice price

but now i know more i now i needed the T2, but i'm wondering what will limit me

 

i would never trust MFI much above 220bhp myself although there have been cars which have done higher using a fifth injector or modifications to the airflow meter.
personally soon as you have to start adding additional injectors or playing with the airflow meter I think you should be considering alternative management. (im not suggesting that these do not work, its just that the management is at its limit for you to have to be taking these actions, I personally prefer some headroom)

I ran a similar setup to you a while back but it was a turbosystems ported head, cam and chip and got around the previously stated 180-190 bhp depending upon rollers i visited

 

from what ive been told is the piper 285 T dont like big boost, but they maybe a way round this, you really want a newman cam if you going for real big power like i said mfi can knock out 250 brake with right mods but for a real strong engine then you want pistons, rods,maybe lightweight & knife edged crankshaft cossie management, bigger injectors, maybe mappable water injection, bigger bore exhaust, filter's, suspension, brakes getting it mapped set up the list goes on, but i would say a chip & cooler with the mods you already have will give you around 175-185

 

ohw i forgot to tell, but i also have a 3" stainless steel exhaust and a K&N filter, but also got the orgininal. Don't know which i'm going to use.
I think the K&N is sucking alot hot air


I also got other mods but didn't list them for bhp

Already got cossie brakes fitted
Got koni dampers & eibach spring all around

So with this all it will be the cam that limit's me and when i change the cams what will be the next limit then?

 

get a standard cam! they are best all round cams!

 

yes & no they can be a good all rounder but start to tail off at the top end if fitted to big head's ( gas flowed ) but low down range can be very good.

 

forgot to say performace ford did something a while back with kent, piper, & the std ford cam not much between kent & piper but the ford was down on torque when compared to the other's.

 

I just nearly spat tea and chocolate digestive all over my monitor.

 

You sure on that one mate?

 

It did an 11 second 1/4 mile.

 

What holy fuck

 

Yeah man. Even though it only managed that once and every other run was total shite. Can't remember which of their cars it was, but certainly caused a stir back in the day.

I think it amounted to faulty timing gear.

 

Didn't the R5 that it run next to run a 10 something and the owner of that even said not a chance!

 

So back on topic please

What will it start doing with the 180/190 bhp? will it start detonate? of will fuelling will be to low?

 

Right, remember this, MFi equipped RST's are now around 20 years old. which means that the parts on these cars are mostly old and tired. As such there is alot of variation in the amount of wear that has occurred, therefore there is no positive answer as to how much fuel (and therefore power) an MFi system can supply.

That said, I did 155mph on MFi with no 5th Injector. I must have had at least 250bhp then. However, RST's have been known to not even make it to 180bhp before needing a 5th Injector.

Basically, as you increase boost, you must also increase fuel and there will reach a point where the MFi system just cannot supply enough fuel for the amount of boost you are trying to run. Consequently, if you run the car at a boost level beyond which there is adequate fuel to support it, you will melt the engine.

No-one on an Internet forum can tell you where that point will be on your car, this can only be learnt via a proper RR setup.

Understand?

 

nathan scadden, white s2, all jacked up at the back

that was the 11 sec car im sure

 

Dont say that, every time I hear that it makes me want to piss myself.

 

There is so much talk about how much bhp some one has with a set up and i couldn't explain the big differences. But now i understand

Tnx mate!

 

Remember also that there are ALOT of bullshit BHP figures out there too, which makes it all even more confusing.

 

if your getting it rolling road ask which bhp figure your getting the one at the wheels or the one at the crank because some firms will take it at the wheels like most but the run it through a formula and give you what in thoery should be the crank figure but like what has been said because of the wear and tear on these engines the only way to get a true crank figure is with engine outta the car and on a dyno

 

In all honesty, part of what you say is true, but in reality, wear-and-tear is not relevant with Rolling Road runs.

It is true that a Rolling Road only measures power at the wheels and estimates a 'Flywheel' figure. Its more down to the actual dyno how it does that and how 'accurate' it is. RR's that measure coastdown losses are easy to manipulate, a quick tweak on the brake or a movement of the steering wheel will give the illusion of more resistance through the transmission, this inflated figure is added to the measured wheel figure to make an inflated 'flywheel' figure.

Some say that an engine will make more power as it ages, as it is nicely loosened up. There is a limit to that though. I'd say that an engine is in its prime from 5000-50000 miles, depending alot on spec and how much power it has run.

My engine has only done 8000 miles since it was built more than 2 years ago and it has noticeably improved lately with better vacuum readings, suggesting that the rings are now nicely bedded-in.

 

there was a series 1 on mfi in perf ford a while back with 320bhp

with a impreza top mount cooler

 

Did it have 4 separate injectors controlled by an ECU too?

 

 

the grey 1 was 320 bhp on cossie management 1.9zvh ran 13.1 quarters

 

why is that then you know something we dont

 

was a lot of power for 10 year's ago but this christian gezza thinks this sevenvally car was a one hit wonder

 

I recon it was fuck me the 13 are bad enough to get into let alone the 11's lol

mine on mfi and 5th inj did 157
my car ran out of fuel at 240 hp on mfi

 

Christian and Beccy

 

I think christian probably does know something you don't mate look at his sigg ffs he's built a fucking awesome rs turbo and knows more about them than most people,

OH and just incase you didn't see the bit about the severn valley car being on cossie management have one of these for free

 

turbo - There you go, I've amended my signature, just for you, since you thought it was some kind of attack on you. WTF?

 

OK, come on then, what else did it do?

 

WTF i didnt even say anything hold i'll pm you

 

 

hmm thanks for the info pal but dont you think what most people are doing now sevenvally done 10 years ago makes you think. oh be careful who you point that at