how reliable is the hf manifold? how much power/psi?
 

what power levels / psi are you guys making with the hf manifold? i have no issues at all about using it. but i want to know if i go to a higher psi (14-20) making 250-300whp, if it can take it. im hoping to pick up 2 soon. thanks

Re: how reliable is the hf manifold? how much power/psi?
 

youre worried about the manifold failing or not flowing enough?...its not gonna fall apart when you hit 276.5 hp, dont worry. But id get/make a better manifold if i was making a serious setup like that

Re: how reliable is the hf manifold? how much power/psi?
 

I'm hoping to make 250-300whp with it...and AC ;) Flanges should be done soon, just hafta cut and weld the rest. Right now I'm thinking no more than 200whp on 7-10psi stock z6, but I have nearly all the parts for a built sohc vtec with zex cam. Assuming I don't blow more than 1 motor, I'll be trying to convince LovFab to make a EQ-minime manifold that's AC compatible. This project is more about getting my feet wet while making a not-so-common setup. 300whp EF 4door w/AC & drag/autox suspension.

Re: how reliable is the hf manifold? how much power/psi?
 

i was more concerned with it failing or cracking. i just won 2 on ebay. so if one cracks, ill throw the other one on there, with lower boost until i get a decent one made. thanks.

Re: how reliable is the hf manifold? how much power/psi?
 

the amount of boost has no effect on the manifold really

Re: how reliable is the hf manifold? how much power/psi?
 

I got my HF for $5.

I haven't found a reason to upgrade in the 2 years I've been using it. :6

Re: how reliable is the hf manifold? how much power/psi?
 

better then a ------- piece of ---- ssautoslanteye mani

Re: how reliable is the hf manifold? how much power/psi?
 

yeah....i didnt even think of that....the pressure and power isnt really effecting the manifold that much. i would take an hf over ssauto anyday. thanks for you help.

Re: how reliable is the hf manifold? how much power/psi?
 

i'd take a port matched HF over a log manifold any day of the week.

Re: how reliable is the hf manifold? how much power/psi?
 

HF over a GREEDY POS anyday!

Re: how reliable is the hf manifold? how much power/psi?
 

beside isnt the hf mani cast? like a dsm manifold?

Re: how reliable is the hf manifold? how much power/psi?
 

yup

Re: how reliable is the hf manifold? how much power/psi?
 

bad comparison lol...dsm manifolds crack like crazy

Re: how reliable is the hf manifold? how much power/psi?
 

so do their turbo exhaust housings

Re: how reliable is the hf manifold? how much power/psi?
 

i dont think a hf/std will ever crack

but flow compared to like a tubular or a nice ss ram horn would be probably a decent comparisent.
probably a way faster spool.

couldnt really say that though with out finding out its cc rating.

Re: how reliable is the hf manifold? how much power/psi?
 

not me.... i make mad logs, and ive used a hf mani. ill taKE A POERTED LOG ALL DY.

lovefab mani is a gross waste of money also.

Re: how reliable is the hf manifold? how much power/psi?
 

i agree with mr hotrex here. most logs have alot bigger runners than the most extreme ported HF manifold and its the same basic concept (plenum style with no real collector)

Re: how reliable is the hf manifold? how much power/psi?
 

kinda money preference thing. i got a ported/polished hf mani ill prolly use for awhile and then when iget serious ill need to look into something else.

Re: how reliable is the hf manifold? how much power/psi?
 

id get serious from the start.

Re: how reliable is the hf manifold? how much power/psi?
 

I'm considering heavily porting my hf mani and getting a precision scm internally gated turbo down the road. Yeah 500hp potential with the smaller ones eat it.

Re: how reliable is the hf manifold? how much power/psi?
 

why 2? and what is the rest of the setup you are going to use for the big hp D-series?

Re: how reliable is the hf manifold? how much power/psi?
 

are you serious? i'd be willing to say that i've seen in person atleast 10 HF/STD/CX manifolds that were cracked and in a 100% stock car

Re: how reliable is the hf manifold? how much power/psi?
 

so bigger runners meen more power ??? in some aspects.. on a smaller turbo (witch most likely will be going on a d-series.. ihi, t25...) wouldnt need huge runners. i would wrather have a better flowing manifold for that type of application. less bends=better flow... you be the judge ;)

Re: how reliable is the hf manifold? how much power/psi?
 

thanks for all the replies. i picked up 2 cause they were cheap....$10 each on ebay.....they didnt sell cause they never said hf or std or turbo manifold.....just d15 or d16 exhaust manifold. so they ended $10 each plus 25 shipping...for the money i set aside for 1, i got 2. for the 06, im just going for 250-275 whp. for 07 i might upgrade turbo,fuel pump, and ignition, and axles, get some slicks, and shoot for 3-350whp. bulding a d16z6 just eagle h rods, and still need advice on which pistons. depends on how much the stock sleeves can take. would i be better off filling the block, and get a block guard, just a block guard...or just leave it? im using a 14b for now, so i dont expect to get much higher than 250, for this year. and if anyone who is reading this has a 14b exhaust housing for sale, please let me know, i need one. thanks

Re: how reliable is the hf manifold? how much power/psi?
 

I have only seen them cracked on stock cars because of the cat below it. I have never seen them crack on turbo'd cars.
post of fill the block if you can.

Re: how reliable is the hf manifold? how much power/psi?
 

I've seen very few hf manifolds crack, the only one I did see crack I just rewelded it real quick. I would also choose a well ported HF mani over a log manifold. I'm running around 270ish whp in my daily driver using a HF manifold and t3/t4 turbo. However you want to keep AC? thats not gonna happen with the HF mani and decently sized turbo. If you wanna keep AC definatly go with the log.

Jeff

Re: how reliable is the hf manifold? how much power/psi?
 

this is a homemade turbo project....the ac was gone along time ago ;D

Re: how reliable is the hf manifold? how much power/psi?
 

ahh, I accidently read the guys post below yours and thought it was you

I'm hoping to make 250-300whp with it...and AC

I just dont see how it's possible unless you have some crazy ass adapter plate.. Maybe a top mount HF mani? haha.