dohc vtec and boost - Honda Prelude Forum

greengangsta · 01-02-2002, 12:14 AM

this question is for anyone who has a dohc vtec engine with turbo. i wanted to know do this two work together to produce a good response. i was told that when you boost a car thats vtec, the vtec hurst the performance of the car. i heard that when vtec engages and u are already in boost that there is a noticeable drop in power. so can ne1 lemme know how there dohc vtec car is running with boost? how does it feel or act when vtec engages? basically i wanted to know can vtec and boost work together in harmony?

BlueShadow · 01-02-2002, 12:52 AM

Quote:

Originally posted by greengangsta
this question is for anyone who has a dohc vtec engine with turbo. i wanted to know do this two work together to produce a good response. i was told that when you boost a car thats vtec, the vtec hurst the performance of the car. i heard that when vtec engages and u are already in boost that there is a noticeable drop in power. so can ne1 lemme know how there dohc vtec car is running with boost? how does it feel or act when vtec engages? basically i wanted to know can vtec and boost work together in harmony?

Although I don't have first hand experience, I've heard that VTEC Turbo's are harder to tune I think its because of the sudden jump in airflow. so you have to tune for non-VTEC then again for VTEC above the VTEC X-over.

the 2.3L Si non-VTEC although easier to tune has been known to make less power as a 2.2L VTEC with similar setup... or so I've heard.

akuma · 01-06-2002, 12:16 PM

When I dynoed my car, at 4500rpm there was a sharp dip in HP due to VTEC coming in. This was a noticeable dip of 25 - 30 HP. Using the Vtec controller we bumped up the crossover to 6000rpm resulting in a smooth HP curve.

greengangsta · 01-06-2002, 12:57 PM

thanks for the reply. so basically i see that it is all about tuning. to make the vtec and boost work together.