vxrjdave

hi guys im seriously looking into the zfr6758 turbo and zzp stage 1 cams with fuel lobe for my a20nft (lhu) thats in mt astra vxr, trouble is ive read that boost doesnt come in till 4k ,some say same as stock which i dont believe, can someone give me a no bs idea on how this turbo performs in the lower rpms .thanks in advance

AaronJ

iTrader: (4)

My ZFR 6758 spools at 3,100 rpm and hits full boost by about 3,400-3,500 rpm. These numbers were pulled from my HP Tuner logs.

vxrjdave

how is the torque below the boost effected? this thing pulls very well from 1500rpm then goes pear shaped just after 2000rpm , i dont really want to loose that too much which i understand i will to an extent.i currently run 350lbft at 2500rpm, dont want it ending up like vtech

Wert842

iTrader: (3)

You do realize vtec is at the end of powerband.

Omiotek

iTrader: (2)

you wont get any quicker spooling turbo the the efr line of turbos.... if you want like stock spool stay stock. everything else spools slower.

vxrjdave

I don't mind slower spool but after coming from a mazdaspeed 6 and the big turbos do nothing before 4.5k,really don't want that . 3.5k would be fine

vxrjdave

I know , this is what I don't want to have.

AaronJ

iTrader: (4)

I never dyno'd mine at that low of an rpm, but I doubt you'll lose much. The ZFR builds boost and spools pretty darn quick.

vxrjdave

thanks aaron , best get saving

Omiotek

iTrader: (2)

I would flow over 20psi by 3400-3600 with my old 6758

dcrep06

the zfr will put you in the backseat from start to finish compared to stock turbo, no need to worry about losing torque. it will still be there lol. a lot of people also boost ramp cuz of our transmissions too. so depends on everyones tune. i hit 25psi by 4k

colodude18

iTrader: (4)

You don't want to go WOT on the 6758 under 3500 rpms anyway unless you have some serious transmission upgrades.
Like everyone else said, yes it spools slower but only by about 500rpms. Just have to get used to revving a little higher. The stock turbo runs out of steam at higher rpms, this one doesn't!
Once you've experienced this turbo, you won't complain about slow spool anymore. Trust me.

Terminator2

ZFR6758 spools quickly. If setup and tuned correctly it spools about 200-300 RPMs later than stock which is hardly noticable. Oh yeah and tuned most of the ZFR6758 guys in this thread so I know this one LOL.

vxrjdave

Ok cool . That's me sorted . I have 353lbft at 2575rpm so I'm pushing the trans a fair bit. What do you guys run in 3rd gear . I touch 115 mph at 7k rpm.you guys the same ?