i just put together my LS/VTEC setup running SKUNK2 PRO1 cams. man these cams were a pain in the *** to get to idle. it took me a long time to get them dialed in. it was even tougher for me cuz i installed the SKUNK2 pro series IM and also SKunk2 66mm throttle body. i had to play around with the TB for at least a good hour trying to get it to idle. it's set to idle at around 1K rpms. i also had to bump timing up at idle in uberdata up to 21* to get it to smoothen out. will be dynotuning tomorrow so if the numbers r good i'll post em up


oh yea, does anyone have these cams in a OBD2 vehicle? im gonna need to throw on my stock obd2 LS ecu when i get my car inspected so im gonna have to try to get the car to idle with that ecu. does anyone know if they check the idle rpm on a car when they do the OBD2 plug in inspection method? if its over the stock rpm, will u fail?


Modified by boosted k20 at 10:42 AM 10/6/2005

 

what boxes did you bump the timing at?? How is the A:F at idle? Did you need to lean?

 

damn....must be pretty low vaccuum at idle for it to be that hard to idle. did you try advancing the exhaust cam alittle, that would help?

 

My friend has the same problem. He got them to idle now, but it took some time, good luck .

 

Definately try advancing the exhaust just a degree or so to get rid of some overlap. My setup needed that to idle aswell.

Also.. added some timing above and below (including) idle, and pulled out some fuel all around idle.

You may also try to raise the target dle speed some, That sometimes helps too if you bump it a couple hundred rpms u might find a happy medium.

 

im running stock cam gears.

in uberdata i bumped up the timing to 21* in the first 4 columns and up to 1200 rpms mark (from 0-1200 rpms and from 27in/hg to 16in/hg i bumped timing to 21*). idle so far is good, holding steady at 1K. any lower and the car sounds like it wants to shut off. the a/f at idle is in the 15:1 sometimes 16:1 but im gonna need to richen it up just a little bit tomorrow. right now idle rpm is set to 1000 rpms in uberdata

 

gotta love thise cams, i had to pull out -17%fuel to get them to idle in my b16a and play with the tb a little, but im very impressed with the power they make. Mine idles pretty well at 1100 rpm's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PURPLETERROR aka BIGMATT &raquo;</TD></TR><TR><TD CLASS="quote">gotta love thise cams, i had to pull out -17%fuel to get them to idle in my b16a and play with the tb a little, but im very impressed with the power they make. Mine idles pretty well at 1100 rpm's</TD></TR></TABLE>
whats the CR in ur b16?

 

i previously had a full LS motor in the car with crower 403 stage 2 cams. the car pulled nice with those cams, but the PRO1's pulls even stronger out of VTEC than my old setup. cant wait to tune

overall compression on my setup is 11.8:1 (GSR head, LS block, P30 pistons)

 

I ended up needing more like 21 deg timing / +3degrees intake cam (24 degrees cumulative - checked w/ timing light) on the 2L ITB car I played with that had Pro1s. Idle was actually equally smooth from 875-1000 RPM. Took a LOT of air to get them to idle tho - I'd bet you'd need to create a vac leak to help the IACV with a plenum manifold.

 

I just adjust the throttle stop screw and reset the tps afterwards..I can get them to idle at 600 rpm this way

 

i think i need to adjust my TPS sensor. it's not dialed in right. in uberdata, u can see a value for the TPS sensor. on my stock LS TB it was reading 9. now with the skunk2 66mm TB and my old TPS sensor, it's reading 18! i didnt set the tps right. so im gonna make adjustments to it tomorrow. need to dial it down a bit.

damn Tbone, u can get these cams to idle at 600 rpms???? i had it around 700 but the engine kept sounding like it wanted to shut off. with more tuning, im gonna see if i can get these to idle at 800 rpms.

i sold my skunk2 cam gears so i cant make adjustments to the cams. my vacuum gauge reads around 19 -20 in/hg at idle.

 

how do you reset the tps.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suck my DX &raquo;</TD></TR><TR><TD CLASS="quote">
whats the CR in ur b16?</TD></TR></TABLE>

11.6-1

 

if your getting 19-20 inches at idle i dont want to hear about it, you shouldnt have any trouble idling them. shimming the TB open a crack will help the iacv keep up with the engine. my car surges 750 or under because i didnt mess with the TB yet but it will idle at 750 and i only get -16 to -14 in/hg with my non vtec cams. anything over 900 though and i can feel the increase in vacuum on my break pedal lol.

anyway, take away fuel at your idle RPM in your map columns ALL THE WAY to like -3 in/hg. if the car chugs, it WILL drop down that low. you already have your timing bumped so you should be set with that.

 

the cars idling good now, steady at 1K rpms. i wasnt really try n to get pointers on how to idle these cams, i was just letting u guys know that these cams takes a good bit of tuning to get them to idle, but you fella's know that already

for the TPS, u need to loosen the two screws (SKUNK2 TB uses screws. stock TPS sensor is riveted on. u need to make a slot in the rivets and screw it out with a flat head screw driver) that holds it to the TB and move it so that the voltage is reading a certain value. i didnt take note of what this voltage is supposed to be, but im gonna use UBERDATA to tell me where i need to see it at. UBERDATA can read the TPS voltage and gives a number value for it. right now it's reading 18 but it should be reading 9. a quick adjustment should fix it.

 

Yeah sometimes you dont realize the idle issues until you can experience them first hand.

Atleast you got it idling decent. The test will be when the conditions start changing if it idles the same.

Im sure you already know but to get most out of the cams u might want some adjustable cam gears.

 

nah im gonna run the stock gears. Jeff evans tuned a set od PRO 1 cams run n about the same CR as me and he had the intake cam at 0 and exhaust cam at -1. i'll sacrafice the extra 2-5 hp that i might get from adj cam gears

 

The cams arent always degreed in the same. But yeah good luck they arent a total necessity i suppose.

 

if you are gonna want to really tune those cams in your going to need some adjustable cam gears, also how much has the block and or deck been milled ? this will affect the cams centerline in the motor , not to mention that i rarely see a after market cam that is dialed in out of the box with stock gears , degreeing is your friend , just my 2 pennies