2Litre

Hi all,

Just changed my turbine housing to a ar.48 from a .63. I was wondering what determines when boost starts to come in?
Is it solely the size of turbo - compressor/turbine sizing/housing ? or has the mapping/ecu etc play a part?
I no longer use the Amal valve and have a duel port actuator with a pressure adjuster feeding the back of actuator, I beleive this helps to run higer boost by applying pressure therefore stopping the wastegate opening?
It just seems to me that boost starts coming on a bit late, if the presure is not set correctly via presure regulator ajustment that keeps wastegate closed is it possible I am getting premature opening of wastegate causing boost to come in later than it normally would?



Thanks for any info-knowledge.

Tim.

Rsmat

iTrader: (2)

A mapped .48

martysmartie

iTrader: (1)

The fact you have changed the exhaust housing, means you need a remap for a start!

There are a whole lot of factors that effect "spooling", i.e. compression, cams, mapping etc.

Also the turbo plays a big part, a lot of the new types are roller bearing or "twin scroll" affairs which will spool up quicker.

Martin

2Litre

Thanks alot for replies, The guy who wrote my chip for me (Zodqi racing , Malta) has told me it does not need remapping as map sensor-air temp sensor tell the ecu what is needed re fueling etc...



Thanks for your help-opinion's/all input.

Tim.

BigChuck

.
i'd seek a second opinion on that, i would think a major change like exhaust housing would require a tweak to the map,

Rsmat

iTrader: (2)

He's talking bollox mate ... Get it looked at !!!!

2Litre

I have a dyno readout when the car was set up on ar.63 turbine housing but how do I attach cos the exprienced might be able to tell me somthing from it?

The car was set-up with the following-

-Yb205 block
-standard cylinder head
-Standard cams
-Standard pistons/rods/valves/crank etc
-Isky double valve springs
-airtec rad/intercooler/pro alloy turbo cooler (effectivly extra rad as turbo not water cooled)
-standard 3 door ecu
-Uprated loom/fan/fuel pump wiring (MSD)
-Grey injectors
-044 fuel pump
-071 spark plugs
-4x4 exhaust manifold
-Magnex three box exhaust system
-Turbonetics T3/4E stage 2 50 trim .63ar

Compressor housing-inlet 3inch/ outlet 2inch
Turbine wheel- F154/ Minor 2.126 inch/ Major 2.555 inch
Compressor wheel- Minor 2.122inch/ Major 3 inch.


I also have turbo map and again don't know how to attach?


Let me know how to attach dyno readout I sure it will tell?

Cheers everyone, spent three years restoring this car love it and what it right.

Tim.

Rsmat

iTrader: (2)

Attach the pics through photo bucket mate

2Litre

Thanks for that matt , lovely car. Got them on photobucket how do I put them on here?



Thanks Matey.

Tim.

2Litre

It says , I may not post attachments. I supose I cannot attach dyno run sheet etc?

Thanks . Tim.

2Litre

What do i have to do to post attachments?


My best, Tim.

BigChuck

go to photobucket, at the picture there should be some codes, copy the IMG code and past that into your post

Rsmat

iTrader: (2)

Sorry for delay back mate... As above copy IMG code and paste

RSricRS

iTrader: (2)

My cossie t3 .48 on a 2ltr zvh comes on boost at approx 2.5k rpm

RSricRS

iTrader: (2)

Peak boost at 3k rpm

Rsmat

iTrader: (2)

Needs to be a YB RIK mate to compare for him.. I miss the 2.5k spool on my old Rs turbo on the stage 3 T3.48

RSricRS

iTrader: (2)

Got ya! Had a few beers and just dived in on a reply haha, yeah cant beat putting ya foot down and hearing boost kicking in pretty much straight away.

I do need more boost 1bar is boring now, compared to you ya boost junky!

2Litre

Ridgey

iTrader: (5)

I don't think it will need a remap, i'm sure the 380 chip from MSD i have for a T34 can be use dwith either .48, .55 or .63 rear housing.

Isn't it the compressor size that dictates the flow at what ever the boost pressure is.

Having a smaller or bigger exhaust housing just means that the bost will be earlier or later, held for longer etc. A long as the map has the boost range mapped for the rev range combinations then all should be OK.
Thats my understanding anyway.

2Litre

Managed will attach turbo map next, thanks anyone . Get there in the end!



Tim.

James @ M Developments.

iTrader: (2)

Our T34 maps are very different between exhaust housing sizes, the compressor maps are quite different.

In fact we were getting slagged off on another ford forum just last week as one of our T34.63 maps on L8 wouldn't work and was very rich at high rpm and as always it had to be the map at fault.

I got the car in and It was a T34.48. Surprise!

2Litre

Ridley, that is what I have been told, thanks for input. Cheers . Tim.

James @ M Developments.

iTrader: (2)

What turbo is that?

Look at where mats makes peak power compared to yours

James @ M Developments.

iTrader: (2)

the T34 maps of all variants are very different. One won't work on the wrong exhaust housing as they make boost in totally different areas of the maps

Rsmat

iTrader: (2)

Jesus WTF is that turbo ???

2Litre

Hi James ,you guys map cars based on spec, I have no help in Malta to determine weather it works or indeed is any good?
Can you please tell me what you and those at MSD think ? The man who wrote my chip has been doing so for 27 years a very respected cosworth yb tuner in Malta but my knowledge is limited !!!! your thoughts???

My Best, Tim.

James @ M Developments.

iTrader: (2)

Why is it so slow to reach peak power? A good T34.48 map like matts one above that we live mapped will make big boost at 3k rpm,

Yours is very very lazy more like a T4 power graph without the numbers

The fuelling looks ok, but something is not right with that at all unless its been set up and mapped to be like that but I fail to see why you would do that

Rsmat

iTrader: (2)

Hope you sort it Tim mate ...

Ridgey

iTrader: (5)

Ahh right, i got the wrong end of the stick when i bought my Chip from you then James.
I'm looking to upsize my rear housing to a 55 or 63 so i'll be in touch when i do for a chip remap.

James @ M Developments.

iTrader: (2)

Yeah, we can recal the chip for you to suit mate,

2Litre

James , please advise on chip nes- you have my spec 's as above , I will need costings/directions for max boost / instrutions as you deem fit. I will dyno her and post results.

Tim Bliss (timbliss@onvol.net)

Thank you for you help , and thank Mat , my car is as clean as yours. (I have the bug) Ha Ha .

Rsmat

iTrader: (2)

No drama... Get it sorted and enjoy it mate

James @ M Developments.

iTrader: (2)

I'm not sure on that turbo spec if its actually a T34 as we know it. There's no way they make peak power at over 6k rpm

The rest of the. Engine spec looks sensible and pretty normal, we run them at 32psi tailing as rpm climb but they make peak power by 3.5 k rpm, I'd use a -31 actuator with 4 mm of preload.

2Litre

You need the turbo map, sorry James bear with me , can't remember how I attached the last and you are right some pigs are more equal than other's (T34 are by no means the same)

My best. Tim.

James @ M Developments.

iTrader: (2)

I don't think we could do a chip off the shelf for it, it would be a live mapper with that blower on it.

My advise is, if that turbo makes power like that, take it off and get a proper T34

matthewpickup

sorry to jump in what actuator would i need -31 or -34 ?
using msd off the shelf chip 380 bhp
t34 .63
bd14/bd8
siemens55s
double valve springs
valve cut outs
group a air filter
4x4 exhaust manifold
3" exhaust
rs 500 intercooler
turbo cooler
motorsport leads
uprated con rods

also do you sell a pre set fuel regulator for that bhp?
thanks

2Litre

Fair play, What turbo would you sugest? trim? Major-minor on comp/turbine? along with related housings?

Tim.

James @ M Developments.

iTrader: (2)

-31 mate will work fine, we do the weber reg that is pre set

matthewpickup

thanks mate will have to get you to live map it anyway to save the gearbox a little but i want all the right parts on it before i bring it down to you guys dont like wasting peoples time
thanks for getting back to me

James @ M Developments.

iTrader: (2)

The usual T34 will work fine they don't really need playing with, up to you which variant you use but the .48 is the most punchy but runs out of puff at high rpm, where as the .63 is a little more lethargic but has more top end.

Ask cr turbos or turbo technics for some help I'm sure they will be glad to do so.