jonny s2

iTrader: (12)

ok guys,got a t34-48 with 360 bearing,and planning putting it on my freshly built 1.6cvh, wanting to know roughly wot power il be running.ok so heres the spec.ported head newman cam solid lifters 7-8-1 mahl pistons arp rod bolts throughout lightened an balanced bottom end 4paddle clutch,cossie 803 green injectors 3bar map,dta management.cossie t34-48-360bearing-31act, with full 3" straight through exhaust, was wondering if anyone knws the boost i should be running and wot sort of power the turbo can handle

clarke5700

i would say at a rough gess limit the power at 230-240 due to standard rods.

just a wiled gess tho

jonny s2

iTrader: (12)

yeah was thinking between 230-250,just to run it in then change the rods, as the pistons are rated to atleast 350hp. was originally going to drop my full zetec turbo in but things are taking timewhich i knw i could get alot more from. but quite like the cvh

DazC

iTrader: (1)

I'd not push it past 250 on standard rods. Change them and you should be able to see over 300.

jonny s2

iTrader: (12)

dont intend wringing its neck without the rods, daz do you knw wot boost i should be running with that spec? when its run in i shall change the rods, thanks for the sugestions

Herbo747

I would personally run around the 18psi mark should be fine its purely the rods that hold it back.

Rick

if the pistons are 7.8:1 they are std machined items, so around 16-18psi is your limit before you'll do a land.

Rick.

rstdave

iTrader: (3)

Sorry to hijack....bin thinkin about another turbo for my new spec engine and thought about a t34 0.48, wondering how laggy they are on a 1.6 though, anyone care to enlighten??!! 300bhp at what boost??

gus

iTrader: (1)

i would look at a roller bearing core really

mine if not driving in high revs was real laggy, didnt like it as much as when running a t3

hopefully this new thing i have should do the biz

clarke5700

why are you lot thinking about what psi of boost to run?? you need to be aiming at a bhp figure one engine might make 180bhp @ 18psi yet another 230 @ 18psi it all depends on your engines volumetrick efficanty IMO

rstdave

iTrader: (3)

Yeah roller bearing is the way i'm going, obviously it's all a bit of a gamble as i don't know what's proven to work for bigger bhp and no-one exactly shares any tips lol. Exactly what you're saying is what i don't want, my t3 running 250bhp is pretty snappy and i don't want a laggy pig as i use it on track mainly.

Rick

T34 isn't laggy on a 1.6 in my experience.

Rick.

gus

iTrader: (1)

when compared to a t3?

Christian and Beccy

iTrader: (14)

Yeah, I see your point. My machined Mahle's didn't like 16-18psi. They preferred 30psi, 300bhp and 160+mph.

jonny s2

iTrader: (12)

hi guys, i understand that the t34 is more laggy than a t3 originally i planned to strap it to my zetec turbo, just wondering wot it would do on my cvh-mahle pistons can handle 350hp and we all know how crap the rods are,i plan to change the rods once ive mapped it,we are mapping the car our selves hopefully we can dial some of the lag out as its standalone management, once again i thank everyone for your input, john

Rick

Borrowed time thou C.

morph

iTrader: (1)

have you thought about running anti-lag to get rid of the lag?
its does the job on a t34 turbo!

Tim

iTrader: (1)

agreed never had a problem never melted or broke a ring land i would say they are by far the best piston i used ,until this last engine.

jonny s2

iTrader: (12)

yes we maybe fitting anti lag an also a turbo restrictor to reduce this once its been mapped, obviously after the steel rods have been fitted,

Tim

iTrader: (1)

to answer your question about the t34 only change up when you have maxed out the compressor otherwise its pretty pointless tbh.

Christian and Beccy

iTrader: (14)

Rick, I ran those pistons for years! They were removed, I think, in 2005 (see my project thread). They were in very good condition when they came out and certainly weren't changed because they failed!

Good pistons IMO, under-rated.

Christian and Beccy

iTrader: (14)

Don't get too carried away with ALS though, it's not going to make a laggy turbo OK.

jonny s2

iTrader: (12)

thankyou christian for covering that

Micky

I run a t34-48,don't notice any real lag,but mine is only used on track,so rev's are always used.But if you let it fall out of the medium revs,then lag becomes a problem.I'm guessing a 3-5 second wait for lag to dissappear.But again,why would you drive the car badly to let the revs drop in the 1st place?????Regards,Micky

COLEYST200

iTrader: (3)

so lets get this right you are going to put the motor togever put it in the car run it in th en take it out pull iy all to bits put new rods in then put it back in the car ....that is just mad to do the job twice

Rick

C, i've seen a number of mahle ring lands crack. My own did about 30k before faiing. No damage to the anything else, and an easy fix but i can't put my faith in them for an engine built to last.

Rick.

jonny s2

iTrader: (12)

mad?not really this would just to get some sort of map,then if we liked it how it ran then build a higher spec engine ie with steel rods,originally the zetec turbo was planned and would handle that turbo perfectly, just wondering wot it would do on the cvh,ie wot boost and power it would run, people who have had expierience with this cheers

morph

iTrader: (1)

If your going to run big bhp, then there are other reasons like the lag will make the power band much higher which will help with traction issues as the car will be rolling more, whereas a smaller turbo coming in would probably overwhelm the front wheels as the power band starts alot lower down.
i found this with my setup when i had a t3 stage 2 and then went to a t34.
the t3 would make the car spin up very easily but the t34 didn't!

jonny s2

iTrader: (12)

thankyou very much morph,did you find the t34 a better drive as in power delivery?

RSTurboSI

iTrader: (1)

my question is, why you running standard legs? why didnt you go steal rods? lol

jonny s2

iTrader: (12)

TBH MATE THE ENGINE GOT BUILT FOR ANOTHER PROJECT WHICH I AM NO LONGER CARRYING ON,WE ONLY WANTED AROUND 240HP FROM THIS IN THE PREVIOUS PROJECT, I AM AWAITING FOR BITS TO ARRIVE FOR MY ZETEC TURBO,SO REALLY JUST WANT TO HAVE A PLAY AND LEARN MORE ABOUT MAPPING AN DEVELOPING, LATTER ON THIS CVH WILL BE IN ANOTHER SHELL AND RUN AT AROUND 240 ON A STAGE 3 T3,SORRY IF THIS SOUNDS A LIL SILLY

mart rs

iTrader: (5)

use the t3 then and have less lag lol

then you only need mapping once dont you