DOHC VTEC and boost spikes

[DarkCreep]

Sup all.

I dont know much about boost but I was thinking the other day and its probably a really stupid question but can DOHC VTEC cause boost spikes or give different amounts of boost when it kicks in at different times?

I know its not a problem (if it even is) with SOHC VTEC but with DOHC VTEC, it can be a 30hp increase and thats a lot of extra exhaust fumes that can make the turbo spool up faster in a split second.


Soooo can it??? I know people run it all the time im just curious.

 

[2slo4u]

i think it depends on the tuning as well..you can have so much air coming in but if the ecu is telling the injectors to only send out a certain amount of cc's..you'll just run lean
and also thats why turbo sizing is so important, a big size turbo for a single might be a regular size for a dual.
thats why you'll see singles with td04's or t3/t4's with a small exhaust versus the dohcs running t3/t4 right off the back

 

[got traction]

usually the boost spike is caused by poor manifold design, or plain old wastegate issues. It dosent matter if your in vtec or not, that spring should open at a certain psi.

 

[1993DX]

I believe there are a few boost controllers or piggy backs that work with / control vtec.

I'm pretty sure Greddy has one...