dom123

iTrader: (1)

i'm currently running a bd14 inlet which seems is a very popular choice for most diy builders.

but my car seems very gutless at 1k to 2,5k revs. so ive just had a look at the power bands on the kent cam web site to see its likely to be the cam..

bd8 standard cam is 1500rpm to 6000rpm
bd10 1500rpm to 6500rpm
bd12 1500rpm to 6000rpm
bd14 2000rpm to 7000rpm

so my bd14 starts abit late for nice easy pull aways from junctions etc
by looking at these figures surely bd10's are the smothest on the road?

why does no one rate them?
what power can be acieved on standard cams?
also what power on bd10 inlet?

it seems odd if you run a bd14 inlet which produce power to 6500rpm then using it with a bd8 exhaust cam which produces power to on 6000rpm?

who runs performance cams on standard pulleys?

what kind of settings should my veriors dispay using a bd14 inlet with a bd8 exhaust? so i can check my timing isnt miles out..

cheers
cheers

bigchez

I'm not an expert but from what I have read BD10's are very laggy, and would make it worse. Standard cams will do 400 I think.

dom123

iTrader: (1)

i trying to build the sharpest 460bhp off boost as i can get really the chap at torque of the devil recons he's seen 450bhp on standard cams lots of times

Gazzonator

iTrader: (9)

I had mine running 450 bhp on standard cams at Torque Of The Devil last year.

Was nice and responsive low down and it did go well but I think it would have been a nicer car to drive with a set of cams. It seemed to suffer from quite bad boost surge when running 28 psi of boost on a T38 and ported head. I was starting to get fucked off with it tbh, if you wanted to accelerate hard on the motorway, I had to drop a gear, sometimes 2 to stop it surging it's tits off!!

dom123

iTrader: (1)

what exhaust manifold were you runing mate? and inlet? what bhp did you make and lbft

mine was holding back around 5-6k as soon as i changed to a 2wd exhaust manifold it just cured it..

mechanic28

iTrader: (5)

i think bd10 produce less torque then standard ones and for the little gain they give in bhp it just aint worth it

i would say for 360 go for bd15 inlet(i only just found out they insist thro will!) and bd14 exhaust

Rod-Tarry

Correct Cam choice can only be specified if the full Spec is known & then only if you have development background to check that its the best for that combo. Some of the cams being selected are crazy & will create the average shite response YB that litter our streets. Do you pick your Dentist off the street with no training.

dom123

iTrader: (1)

its odd because looking at the bd10 cam spec the powerband 1500rpm to 6500rpm which is same as the standard cam low down with a extra 500rpm at the top...

in my old saph i had both bd10's and i made 385bhp and 416lbft on a t38 which aint to bad. but this was with a 2wd inlet was holding the bhp back..

fordpop

Need to post full spec of motor before you ask

dom123

iTrader: (1)

spec is....

200block with standard 4x4 pistons with valve pockets cut in so whats that around 7-8-1 so ive been told, long stud 4 layer metal gasket..

small turbo inlet with 63mm throttle housing
2wd exhaust manifold
head is 27mm inlet and 23mm outlet
tt38 turbo
60mm cooler 63mm in/outlets.
ybp type engine..

Rs1

iTrader: (1)

Surly just about every yb is going to be gutless below 2.5k and 2.5-3.5k wont be anything spectacular with a tt38. Unless its setup very badly or has a mega tall 1st the car wont be bad at pulling away from junctions.... youve just got to drive it properly or lower your expectations,lol.

dom123

iTrader: (1)

i'm not talking about lag what so ever, i'm just talking about general bhp the engine should have, when i had it on a dyno without using the turbo boost off i was geting 72bhp at the wheels so whats that, 110bhp ish at the fly?... surely it should be near 160bhp ish...

i dont recon i could tow another car with out thrashing it...

as for gear ratios i get about 50 mph in first on my t5 running a 3.62 fifth

Rs1

iTrader: (1)

Hmm, even though 160 @ fly is nothing i think that may be a touch above what the avergage yb will do with no boost?? Not sure though.
T5 gearing isn't great for stop/start towing but thats not how 99% of cossies get used. I guess its application specific, do you need torque/power that low down, do you need to tow? If yes then maybe you have the wrong engine/car.
Realisticly a low comp yb is never going to be great off boost, with that in mind you dont see many people complaining about struggling to get away swiftly at junctions so maybe there a underlying problem.... cam timing like you said probably want checking and maybe a good idea to check fuelling also.