civicman

i am hearing too many things about the b16 and b18b...
A b16 turbocharged at about 5500 rpm(vtec engagement) will fight with the boost from the turbo and they will cancel each other out and also the driver will experience hesitation from the vtec and turbo engaging...next i hear the b18b is the one the best motors to run turbo with...I plan to do a motor swap in april-may 2003 and i just wanted to get as many opinions as i possibly can about this subject...

slowerthanu

Uh, I dont know who you get your info from, but my buddy is running a B18C bottem end (fully built) and a B16A head (Bone stock) and he pulls low 11's at 5000 feet above sea level.

yaya

vtec works wonders with a turbo set up......in a good way i mean

ExospeedAMcrx

what kind of ECU are you using on the swap. in some cases. such as the OBD2 turbo install in the 98+ prelude with the traction control (SH model). there is a hesitation when the map sensor detects boost. it starts trippin out when the Map and the ECU and the traction control computer try to control everyting at the same time.
so in some cases yes, it will have that kind of hesitation, but in most cases, expecially pre-obd2 swaps, Map sensor probs are solved by adding more check valves or using a Missing Link.

Wil

Zer0DazE

if tuned properly vtec and boost work fine together

B18C5-EH2

Bottom line:

VTEC + Turbo = MORE power.

Take equally boosted B16a and B18B and the B16A will outpower the B18B and the car will be quicker. The B18B will make more torque, but it still won't compare as well in terms of power because the sheer head flow of the B16A is much better than the non-VTEC head.

This isn't to say that boosted LS motors can't make good power, but they are not any "better" for turbo in terms of power output and drivablilty.

GetawayInMoscow

I swear to God 99% of Honda owners don't know what VTEC is. Can someone please try to scientifically explain how VTEC is BAD for a turbocharged engine? You CAN'T because It's actually a lot better. If you don't believe me go ask GSRwBOOST, I'm sure he can set you straight.

In my opinion, I think VTEC is an excellent thing for a turbocharged engine. It's like icing on a cake.

P.S. Listen to B18C5-Eh2 he knows his stuff....

B18C5-EH2

Before any of the Einsteins chime in with:

"...but Jojo Callos and the 9 and 10 second cars actually cancel out their VTEC with their turbo set-ups"

This might be true, but they have full race motors that also don't have water jackets and are not intended for street use most if not all of the time.

If we're talking basic turbo kits like Drag, F-Max, etc. then my original statements hold true - the VTEC motor will outpower the non-VTEC.

x James Bond x

Man oh man

You should preach what you know, not what you hear. Vtrec and turbo get along fine, WTF cancel each other out? Well you are at the right place, stick around here and learn. Read Read Read.

civicman

my friend has a b20/b18c1 built with a f- max turbo and hondat(can't remember) and he is having the problem I am speaking of.
at about 4500 rpm turbo spools and vtec engages, it redlines faster than i can blink at about 9500 rpm and he goes nowhere in first gear and second gear and sometimes third. he has to set the vtec engagement at 8500 rpm to move off the line...

x James Bond x

Well then, either he or whoever is tunning that hondata doesnt know what there doing now do they? I guess when I drove my 270 WHP(stock motor, just a head gaskette) turbo h22a prelude around for 2 years I was just on acid and it really didnt work.

Good Tunning, good Tunning and some more good tunning, damn even some semi good tunning will make power.

chillly

Don't you mean "EXTERRAwFAMILY"?

slowEJ6

might want to invest in a new tuning shop cuz whoever set up his shiet done fugged up.

EKB18BPR3

i nver heard of this rumor...

slowerthanu

So true, The B18B gets its extra torque over the B16A because of the displacement increase, unfortunatly, the B18B head just wont flow well enough at high rpms to keep up with a B16A. This is of course were the idea for LS/VTEC came from. For one, you can spend a shitload of money to get an LS head Ported and polished, get uprgraded valve springs and some nasty cams. Now you have a ported head with a crappy idle and you cant go any further, you could bolt on a VTEC head for less money and have a smooth idle and stock ports, leaving the opertunity for more power in your hands.