hi ive currently got a 2wd which im doing an engine rebuild on at present. Im looking for 400 and 400 only as im on a 205 block. So far its got standard mahle 0.5 oversize pocketed and dished pistons, lightened and balanced crank, rods, flywheel, its running a t34 with 360 normal bearing and .48 exhaust housing, ive got bd14 inlet and exhaust cams, isky double valvbe springs, group a head gascket, full mongoose exhaust, 500 intercooler, bailey breather. did have greys but got told they were hose pipes so sold them and opted for some siemens 660's. the head ive got has been nicely ported but is cracked in one of the chambers which im currently trying to get repaired, yeah i know but its a good head othet than that. ive been told that going to a bd10 exhaust cam would be a better option and also im a little unsure if these are the injectors i need? any other pointers to get 400 would be great. it made 378 before on the set up ive just explained with the greys and the orginal chip it had. we have full mapping facilities at my work so thats no issue, its just gettting the basics right, any help would be great. oh yeah its got a 3bar and is on standard L6 2wd saff management.

 

.48 housing will need to go and a .63 required (although this will be still pushing your turbo to its limit!)greys will be fine!hosepipe and borewash is nothing to do with the injector all down to the mapping!or seimens 55lb will do!thats about it on what you have!standard camshafts can do 400bhp i think!also you will need a grp A fuel pump and coil just to be on the safe side!what inet plemun have you got?

 

as said turbo housing needs to be bigger, and agree its down to mapping rather than greys injectors being bad for borewashing etc, been told that by a few tuners now. Cam wise a bd10 wont be much good? been told you can bhp with a bd10 over standard but loose torque. Your Bd14 will be fine for 400bhp althou most ppl i speak to say a standard exhaust is fine, not head of standard cams being used for 400bhp thou?! if the heads off you can run the group a headgasket but alot of ppl prefer the multi layer ones, althou wire ringing the block and a group a gasket is a tried and tested way of doing it too, and as said a group a fuel pump is a deff good idea to make sure your getting enough fuel, but also worth going over the wireing too ti aswell!

 

cheers for that, forgot to mention its got a group a coil, how much do group a pumps cost? someone said that its better to have a smaller exhaust cam then inlet cam because it retains gas pressure in the head or something like that. shit sold the greys now, slightly annoyed, theres so many bloody experts out there tellin me they were shit but it always ran fine on them and the bores wernt too bad when i took it apart! just need to get the head sorted now, someone tried welding it but the weld turned out to be pourous so im back to square one! is a group a gascket good for 400? its a standard inlet plenum aswell. any ideas on where and how much a .63 is? so siemens 55lbs are the ones to get, do ineed a fitting kit or anything? thanks boys, much appreciated.

 

seimens fit straight in!.63 aint cheap new around £350 i think bit if you can wait good second hand ones do turn up from £120-£160 i dont think standard 2wd inlet plenum will flow enough for 400 you need a 4x4,small turbo(escos)or a 500 t flow enough for 400 hp,grp A fuel pumps cost around £130 and like said above good idea to rewire the pump wiring!grp A headgasket is good for 400 hp although a small turbo one is even better

 

your head is scrap

 

i was going to say the same but didint want to ruin the guys day

 

Aren't you helpful today tony... at least tell the guy why its scrap

 

Well not necesarily, my boss has welded up loads of cracked heads with alot of success, you shouldnt be so quick just to throw something away! unfortunately my boss's big tig welder is broken at present hence why i had to get another machine shop to do it but not sure if they done a proper job or not, just gonna have to wait and see also dont forget how expensive a good, thick and ported head is!

 

thanks by the way to mechanic 28 for the advice

 

as tony said throw it away or stick it on ebay in need of repair, if you are only after 400bhp a good uncracked head wont need a major porting job

 

Make sure you uprate your brakes too!!


I've got a good 2wd head for sale too

 

I have said it many times 400bhp is a shit figure to go for on a Cossie. Either go for 370-380bhp or 420bhp, T34's dont last long when being pushed to try and get 400bhp. Either change your turbo and go for 420bhp ish or just be happy with what you have got.

 

205 block could be an issue, fair comment tho.

 

nah 400bhp is ok for 205 imo my old cossie was 425bhp on 205 for years.

 

205 blocks are hit and miss in truth just like the 200 blocks some 05's carack at stage 3 others will handle 500bhp,its luck of the draw tbh mate!although it seems in general most would not recommend going above 400-420 on a 205

 

If you are worried i about it i would just stick with the spec you have. Car will be very quite like this and is it worth the extra hassle of a turbo being pushed so hard you go through 3 of them a year?

I would change the BD14 exhaust cam for a standard and get it remapped, it will be more responsive low down then which is a better match for the turbo you have.

Just to add i have ran a T4 and Greys on 2 different 205 blocks and not cracked yet.

 

my advise would be not to chase numbers! why do you want 400hp?

if its going to be a road car and dont want it to laggy then a t34 is ideal for the road, 400 is a bit

your 205 block is fine at that power level, although i dont like the sound of your head tho i'm afraid

my road spec i had was, 500 cooler, msd chip, 55lb siemens, t34.55, standard head and standard compression

it made for a useful road car with around 360-370hp, but most importantly it drove nice, came on boost quick etc

stick with standard cams if i were you

 

i would go...

ported head
standard cams
group a head gasket
4x4 inlet plenum with 10mm spacer
60mm 500 intercooler
grey injectors
group a fuel pump with new fuel filter
t38 or gt30 turbo
l8 ecu
live map

this will piss 400bhp 400ftlb

 

And you shouldn't be as quick as to dismiss some ones opinion who seriously knows his stuff.Yes Tony was blunt,but if he says scrap then he wouldn't use it so you shouldn't yourself.In all fairness you have put no pics of the damage for anyone to see but if you meet anyone who you think has more knowledge/experience of the yb motor tell em to ring Tony,their head will spin !! Just my 10p worth,no dig intended

 

Hi there Stu, i'm rebuilding my 205 YB at the moment and about 400bhp would be really interesting, as long as that doesn't mean i'm over stressing the engine. The car is only used on the road and not a track toy so i won't be using it's power all the time. Can i have a rev limit of 7,5/8k rpm, to give a bit more top speed?
What would you suggest?Cams/turbo/boost?
At the moment i have: grey's, 3 bar, forge 500 ic, mongoose 3''
Hope you can guide me in the right direction, thanks

 

400/400?

Why not BD14 inlet, GT3071 and fucking good map?

 

 

My head was porous, got it lock and stitched around water jackets,
Has been working for 2 years on a t34.63 @26 psi not a problem.

But for the price it cost me to get repaired it was a gamble as to if it would hold up to
the abuse. + the other thing to bear in mind is the heads thickness as thats also a factor as to whether the heads worth saving or not.