Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

I got a 94 Civic DX Hatch
p28 ECU (ofcourse
Greddy SOHC Turbo Kit (15g)
Intercooler
Gude Built Head:
port & polished
valves
springs
retainers
camshaft

adjustable cam gear (set at 0)
dsm 450cc injectors
VAFC II
greddy sp catback
stock greddy downpipe (could be part of the issue)
msd ignition w/blaster coil

Dist. is retarded all the way

cars moves pretty well from the get go, but the moment Vtec Engages which is around 5200 the car feels like it just loses power all and all like the turbo just dissapears.

Not sure the proper way to test of Vtec is engaging or what. The dial changes color on the VAFC when Vtec Engages, but i'm not sure what else could be going on here. Boosting 6psi so the turbo should not be topping out really granted it is a small turbo.

Any suggestions as to what could be going on here?

I am also running a stock cat . . . . any and all suggestions are welcome.

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

why is the dizzy retarded all the way?

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

I just thought it was safe, but I guess that by doing so i'm loosing a lot of power. What would u suggest?

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

I am no turbo guru but I would suggest selling the VFAC II on Egay and go Uberdata! Change your dizzy back to stock and troubleshoot from there. Projecteg does the ecu's for cheap!

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

very understandable. I ran uberdata and made 350hp on my LS motor running 14psi. I had uberdata on my car but my ECU crapped out which is why I was forced to buy yhe VAFC to make my car drivable because I refused to drive with a FMU on my car. So I need to kinda address this issue and fix my ecu to run uberdata again

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

TTT

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

Get another ECU if you have to but troubleshooting with the VFAC is gonna own you!

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

they are selling a kit in classifeds, u get a ecu, chipped, basemaps, and a buner, sell that hack and use the money or uberdata

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

The thing is I don't believe it's the hack that is causing my power to be lost when Vtec Engages . . . . so selling the VAFC II is not going to solve my problems. I know how could Uberdata is because I ran it on my self tuned 350whp Built LS Motor and everything was good until my car was stolen. I'm pretty sure i'll encounter the same problem running uberdata, so I first need to resolve this issue =)

I have 4 spare chips, I got the moates burner, I got a chipped p28 ecu just not sure if it works yet since I have not tested it out since my friend re-soldered it.

Does anyone have any idea as to what could cause that power loss?

SMall Greddy Downpipe with a Cat Converter? Perhaps creating to much back pressure?
Timing?
Valves?
Vtec Not Engaging?

Re: Boosted Z6 w/Built Head, Power Dies After VTEC Engages
 

Here is the only CAM that I have found that GUDE makes for my particular application:

PART NO: HCCS14
DESCRIPTION: Excellent with NOS.
POWER BAND 2000 RPM. to 8500 RPM.
IDLE: Fair
SPECIFICATIONS:


Intake Lift - .397 Duration - 261
Exhaust Lift - .407 Duration - 228

Is that the specs of a NA cam or turbo friendly cam? Here is some CROWER Specs for a turbo cam just to compare:



Stage 1 - Features far more agressive ramp rate then stock with added duration.
Excellent for turbo and nitrous.
Idle to 7200+ rpm.

Advertised Duration: 292 / 302
Duration @ .050": 228 / 208
Gross Lift w/ 1.6 int /1.8 ext 406 / 385


What do you guys think?