so i finally got my car tuned. its an ls/vtec making 200whp. my pro1 cams liked vtec at 6800, and i redline at 8600. every shift drop me out of vtec by 800-1000 rpms, which i know will kill my times.

now my question is, i was planning on stepping up from my 4.4 final to a 4.785 fd. will this in anyway help the rpm drop? or is the only way to go with something like the mfactory close ratio gearset?

thanks for any insight

 

are you using a LS trans? why dont you upgrade to a gsr or b16 trans? what size tires?

 

gsr trans all stock with 205/50/15's.

 

Final drive will only lower/raise speed in each gear.

Ratio will change your rpm drop.

 

so i should do the 3.070 first with the close ratio 3-4-5 over the 4.785 final?

 

why not just lower ur vtec down to 6k?

 

because when tuned to clean the dip out of the power curve thats where it needed to be, and thats where it made themost power once we played with the cam gears. pro 1s usually like high x-overs. you cant just drop the x-over 800 rpms.

 

and the power stopped at 8600?.. most pro 1's make power to well over 9k if there a nice header..

 

no i can make power higher, but its on factory ls rods with just arp hardware so for longevitys sake we decided to keep it below 9k.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by killerpenguin21 &raquo;</TD></TR><TR><TD CLASS="quote">so i should do the 3.070 first with the close ratio 3-4-5 over the 4.785 final?</TD></TR></TABLE>

the MFactory closed gear ratio set will definitely cure your RPM drop problem. Is this a daily driver?

 

If the dyno graph is clean and smooth, just because it's not in VTEC doesn't mean it's not making power. It sounds like you need to re-evaluate your setup though. 1800 RPM from VTEC to limiter seems kinda pointless when those cams will pull much higher...

 

who tuned it? theirs no reason vtec should be that high.

 

^^ Totally agree with you, Vtec that high is just insanely pointless.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DJsilkyjr &raquo;</TD></TR><TR><TD CLASS="quote">who tuned it? theirs no reason vtec should be that high.</TD></TR></TABLE>


I am pretty sure I tuned this car. I have all of the graphs of the car. I do believe I started with vtec around 5800 and the car did not want anything to do with it. So it was moved up.

I will go back over the graphs and my logs to see if there is something I missed. This was the first car to be tuned on the new dyno. Now I have a much much better hang of the dyna pack, I wouldn't mind seeing the car again.

 

yeah the dip when vtec was below 6 was rediculous and then when you moved it up it made a perfectly straight line. trust me the car doesnt need vtec to make power, and infact if i wind out first the tires light up when i x-over. im more than happy with the tune, and it was my decision to put the limiter below 9.

this is how i wanted the motor, i didnt need it to be squeezing everything to the limit, i actually drive the car, and would like it to last a while. now im looking to optimize the rest of the parts to make it all one great package.