B20/Vtec .VS. LS/Vtec

[Girl]

What one would be better for a Turbo application? It seems that the cost to build them are basically the same. So which one will give out more power?

[EJMH]

Originally posted by Girl
What one would be better for a Turbo application? It seems that the cost to build them are basically the same. So which one will give out more power?

y dont u just save money and go ls or b20 turbo?

[txhatch]

Originally posted by EJMH
y dont u just save money and go ls or b20 turbo?

Adding vtec will be more of a hassle then its worth.

[mls]

Well, seeing as you are adding a turbine, then adding a VTEC Head isn't really necessary. It will be more reliable going with a standard DOHC (VTEC has more parts). Yes, a DOHC VTEC head will gain you more power, etc., but the turbine will do just as good a job providing enough drivability (depending on the turbine selection & boost settings, etc.).

Id choose a B20 complete engine for a turbo application, as the extra capacity will give more off boost torque & better low rpm response.

[90Si]

isnt B20 ***** a CR*****??

why is it showing those astricts and not V - T E C ????

[txhatch]

cus it is spelled VTEC

And yes crvtec is b20/vtec.

[Girl]

Wouldn't you get a lot more power from boosting a CRVtec then just a normal B20?

[mls]

Originally posted by Girl
Wouldn't you get a lot more power from boosting a CRVtec then just a normal B20?

If you get your cams profiled to the equivalent of the DOHC VTEC head (when VTEC is engaged), & considering flow rates through the head are the same, then it will make no more power. If you can get your B20 to rev out to 8000rpm, have the head flowed to the specs of a DOHC VTEC head & get the right cams to run at that speed, then theoretically, a DOHC VTEC will make no more power than the non VTEC B20. Just remember, the DOHC VTEC fitted B20 will be more tractable at low rpm compared to a high rpm high lift & duration cam fitted non VTEC B20. DOHC VTEC gives you two cam profiles for low & high rpm, whereas a non DOHC VTEC only has one cam for the entire rpm range.

But seeing as you are looking at forced induction, you do not need wild profile cams to make good power & torque (generally, the more lift & duration the cams have, the more power, but low rpm torque & response is compromised). Just to compare, a naturally aspirated 996 Carrera 3.6 has more aggressive camshaft profiles as the 996 Turbo 3.6.

Overall, the average B20 with DOHC VTEC head will make more power than a standard B20 (because most people don't really port the head to DOHC VTEC specs, etc.). The extra money you will spend on putting a DOHC VTEC head, you will be better off porting the standard head, getting proper profiled camshafts, & raising the boost slightly to make the extra power. You really don't need the extra revs when you are adding a turbo (the turbo fills in this gap).

I hope my post is legible.

[xJDM94x]

personally i wouldn't go w/ a B20 unless you plan on resleeving it.. those sleeves are so thin.. my friends sleeves started to crack in his b20vtec after 2 or 3 months. the LS has thicker sleeves.. considering a b20 is the same thing as a LS except it has a bigger bore.

[blueSI]

i know a bad ass turbo manufactorer with turbo kits but the are high, you can check out their website, they put a turbo on a stock gsr excpet for an jg edlebrock im and a hondata at 7 pounds of boost they made 317 whp. go check out fullrace.com and i would go crvtec i have seen 320 hp on a stck b20block and stock si head boosting 9 pounds.

[Girl]

Wow... So I'm confused... But I don't even know about what...

But you're saying that a B20/Vtec won't be any better than a normal B20 if I have a turbo on it. Just as long as the B20 has a P&P head and good cams?

And would I need to resleeve the B20 block?

Should I run higher or lower compression? I know lower compression will allow you to boost higher, but higher compression will just give out more power... So um... Yeah... What?

[CRVTEC0WNZJ00]

VTEC heads outflow LS heads period. Honestly if your building any serious serious turbo setup VTEC or not your going to build the cylinder head and that means cams, valves, retainers, springs etc etc. VTEC head will gain you more power on less boost for roughly the same cost of building a serious turbo LS or turbo B20.