Alright so I picked up this car a couple weeks ago and while it was claimed to be "tuned" I quickly discovered this tune wasnt up to my standards. Cruise was mental rich (see 12:1 on the highway and in boost 10:1) and just generally it looked like it was tuned to never blow up and run very inefficiently. Unacceptable.

So the car is a low comp (3mm HG)F20c w/ GT35R Lovefab mini ramhorn, ext tial, aem v2, 1000ID's, Walbro 255, ect

My issue is that the car seems only to make around 9psi or so before vtec engages, it literally feels like it hits a wall until vtec hits then it sprints up to 17-19psi instantly (depending on what I have it set at).

So is the economy lobe (or lower lobe whatever you guys call it) on the cam limiting my 35R so much that its choking it out?

I've read abit about lowering vtec engagement on turbo motors but this is the first vtec turbo honda I've had (turbo miatas are my forte ) and Im not positive that this will solve my problem. As it sits vtec is 7200rpm...definitely seems way to high

-Dean

edit: So digging into aem tuner I see vtec is set to engage at 5200 but only above 8.4psi which takes forever to make with this huge turbo. Thoughts on lowering this load? Definitely would have to make the runs with det cans on as I'm guessing thats why its set so high in the first place.

 

I'd suggest posting this (or at least referencing it) in the Forced Induction section. I know it's EMS-related, but the turbo guys should be able to quickly answer your question.

 

I would personally set VTEC to come in at a much lower boost level, if not atmospheric pressure.

Tim

 

there is really no telling whats going on... you'd need to post the map or get it to a tuner. sounds botched to me

 

It's possible one of your sensors isn't reading correctly. The air intake, coolant or map sensor. Verify all those are reading correctly. I would move vtec engagement down to 1lb or round about. The rpm is fine.

 

This too, lol

 

that tune is shot man get a new tuner

 

yeh i would be setting Vtec to engage around sub 4000rpm and with a MAP of 100kpa. What about the boost control settings? how are they controlled? very important you need to match your vtec opening with how boost is controlled. You dont wanna switch into VTEC when your cruising, this is important.