...do you think i will get 400bhp?

...std rebuilt engine no porting std cams grp a head gasket (until she blows) t34 .63 with greys...using a MSD chip for anti lag etc..radtec intercooler,side exit 3inch exhaust


...i am hoping this will get 400bhp on big boost..and in theory with the 3.9-1 diffs and strengthened front diff with i assume std 4x4 gearbox (grp n box) should be pretty ok aslong as launching is kept to a minimum?

I want a fast reliablish car..not going big bhp too much money..plus a rally car should be more about torque

 

My 3 door has run 403 bhp with a standard head/bottom end, 500 cooler, t34.48 and light blues. Its running less than that now, but I have the graph in the folder, and PJ confirmed this on Saturday morning when I took it for a set up.

So yes, I can't see a problem.

 

....so would a .48 sneak 400bhp...or would a .55 be better???

 

.48 would sneak it if you wring its neck. 55 should deffo do it. But the 48 is punchier, and if you want it to drive like a rally car...... you'll prob use ALS!!

 

I thought it was physically impossible to run 400hp on a .48 housing?

 

Not if you stick a "400bhp" sticker on the boot!

 

...so lets get facts:-

max BHP on:-

.48

.55

.63

 

Depends what rolling road you go to.

 

I have the graph showing 403 bhp on the dynapack hub dyno. The car is mapped for v-power only, and PJ said he played with the spark side of things quite a bit to get there. Its not running that power now - only stage 3 - but I don't see why he'd lie to me. Its not like that was the selling point of the car, or even like I bought it from him. I'll scan the graph if you want.

 

I think PJ is on coke if you got a genuine 400bhp from a .48

.48 your lucky to get 350bhp
.55 380 at a stretch
.63 will punch over 400bhp

Thats what i have physically seen

I have never seen the power quoted on a .48 ever and never seen a .55 at a genuine 400bhp

Think he needs is Dyno sorting or stop sniffing

 

 

I bet he managed it on yellows as well

 

Blues will manage the power but not on a .48, unless im ve4ry much mistaken (which i dont think i am)

 

Dunno then. I'm no Cossie expert, I only bought it 2 weeks ago!!

I have no reason to disbelive him as to what it ran, and I have the graph. He said that he used to have an engine dyno, and cars ran about 30-40 bhp less on the dyna pack than they did on the engine dyno.

Perhaps I am completely wrong and there's not a hope in hell of 400 on a .48. But again, there's no reason to lie to me - I only had it in for a set up to check fuelling etc.

It is a still very fresh engine - less than 12k now from a FULL rebuild including bore, ground crank, fresh head etc. And when it ran the 403 it would have been about 9k on the new build.

Need someone who REALLY knows their stuff to answer. not saying you don't, but one of the well known and knowledgeable tuners.)

 

Fair enough, im only saying true figures i have seen, so see what others say

 

im running a T34 48 on 55lb siemens injectors im looking for between 380 and 400bhp but will have to see what Stu can do with the final map

 

you wont see those figures on a .48, you would be ringing the tits off the turbo and even then there to high

 

A .48 running that power even if possible wouldnt last long imo due to have its arse kicked big style.

Steve

 

i made 370 on a .48 at 32psi,headwork plenum etc etc,you wouldnt get any more....i tried

400-410 is .63

 

i got round about 420-430 on a standard engine runnig a rs500 T4 (bigger rear housing than a t34 .63) and at 28lbs.

and you think you can get 400+ with a t34 .48, i don't think so.

deffo need a bigger housing and lots of boost.

 

Depends massively on the rest of the spec, but the figures of 350/380/400 above are a pretty good rule of thumb based on what ive seen TBH

350 is plenty if you have huge gobs of low down torque anyway IMHO for anything but 4th/5th gear, and thats not what a rally car is for.

Are you actually going to use it at a rally though?

 

i was right then

 

Ah maybe a bit ambitious then tbh im not on a horse power quest anyway i have built the engine to be punchy and quick with as little lag as possible to make it more usable on the road thanks all for your insight tho will let you know the figures when i eventually get it on the road!!!

 

What is a reasonable figure to add to an at the wheels figure to get flywheel power?

(I know it is a %, is a guess at best, blah de blah, but is there a figure that can be added as a rule of thumb?)

 

15% ish, but TBH its all bollocks, it varies massively and is not easy to measure as the rundown losses arent neccesarily the same as the amount lost under load as the friction between the cogs are different.

 

 

Silly me, dunno what came over me when I actually asked that as a serious question

for me

 

Got 406bhp out of mine with head work,T34.63 live mapped MSD greys with L8 ECU.
Peaking at 35 psi and holding 28psi,turbo lasted 6 months running that boost

 

i reckon im pretty close on my figures then

 

was just about to say youll be over spooling the turbo to fuck on todays shit fuel and will kill it quick

 

changed my mind,, this car is all in my head ROFL

 

whos posing as phil?

sad cunt

 

Its a 50/50 gamble between SECS and Phil IMHO

Could genuinely be either of them tonight

 

KOS KEV : That sounds about right.....but remember you were running a .63 ......... Modified Head.........Grey's...........L8 ECU.......Live Mapped, and a huge 35psi of boost. Assuming it was a good engine, then that was still very good to achive anything over 400bhp.

So a standard engine running a .48 has no chance of getting 400bhp at all. If it took you 35psi of boost, modified head, L8 Ecu and a Live Map.....then a .48 is going to run up to about 360 absolute max.

I remember when Mike R was recomending a set-up to go beyond Stage 3......I ran a T34 .55, Big Intercooler, Greys, Live Mapped on a fresh engine on standard cr, and could still only manage 368BHP....and that was running at 2bar (30psi), and I don't think the turbo would have lasted too long at that boost.

 

Ive noticed simon keeps appearing, if he had spent as much time on customer service as he has hacking this forum he would be worth a fortune now

"coming back from the dead - like his many relatives who died when he didnt return someone,s parts in time"

 

BTTT...400bhp from a T34 .55 OR .63?

 

Why does it matter?

Surely just go T34 with a 55 on greens if you want a nice punchy point to point car, or 63 on greys if you want to push the turbo hard.

 

green/grey and t34 55 or 48

nice little spike makes a lovely road car, and very responsive.