AllMotr

i have a 2.0l gsr turbo(ported head, 8.3-1 comp etc.) with skunk2 stage 3 cams, the problem i am having is vtec. Now what i want to know is is there too much duration that is causing to much overlap and making vtec almost not present? i have vtec set at 5500 but when it crosses i dont even feel it and is this cause of the n/a cams? now i have adjustable cam gears and im going to dial out the overlap but was just wondering on is it a waste of time too try and run these cams cause there is going to be too much overlap or do i be patient and dial the overlap out? and how much overlap am i expceting to dial out(just a estimate if possible). i have been searching and found lots of useful info on here but would like someone to chime in and gimme a little advice. thank you in advance.

AllMotr

TTT.

AllMotr

BUMP

awdgsx96

I know alot of people run ITR, CTR, and GSR cams in their B-series as upgrades and gain some nice numbers, but I don't remember them saying they couldn't feel the VTEC crossover. I know they don't have the lift of the S2's, just some insight

Is your car tuned? Some people say a properly tuned VTEC+turbo shouldn't have a big kick at the crossover, it should be a linear delivery.

96 GSR-T

My friend is running an 85mm LS/V with a FR Stg3 pushing 600hp all day on E85, he is running CTR cams and you do not feel the crossover, its just 1 big rush from 4k on, cant even really hear it over the wastegate and exhaust. I think the Stg3's are way overkill in your case, many have had alot of success with the Stg1's, they hold torque very nicely and are similar to the CTR/ITR profiles.

AllMotr

we noticed it on the dyno that we couldnt notice it crossing over and checking the graph it also showed no diff. in the graph, i would think even with the stage 3's that u should notice something in vtec. i will try a set of gsr cams and see if that helps. thank you for u words.

awdgsx96

As 96 said, it might be overkill for your setup.

What kind of power are you pushing?

AllMotr

i had them from my allmotor setup and just wanted to try them, im only making 260whp at 15psi on my setup. i also think there overkill but thought that i might try them. thanks for the help guys.

awdgsx96

That doesn't sound right to me.

Isn't the SC61 a decent sized turbo or am I thinking the SC50 or something like that?

AllMotr

i took a charge pipe off and checked for vtec cross over with no boost and its not even crossing over and im kicking no lights. this has been the main problem, i thought i fixed the problem when i rewired my engine bay and swapped a known good ecu, so thats why i dont notice it cause vtec isnt even crossing over.

awdgsx96

That is a big no no.

You tried getting into VTEC range with a charge pipe off? You probably overspun the **** out of your turbo. Have you ever done this previously?

AllMotr

I also have a oil pressure gauge in my car and its always around 70-80 psi in higher rpm but i just noticed when i hit vtec engagement it drops to around 50-55psi and holds. last year i was n/a and vtec was working good, i had a oil pump internally explode and threw metal shavings into my block and it took the #5 main bearing out, i had the block fully disassembled and i cleaned this block very good and ran air pressure threw all the oil orfices in the block. now if i had a piece of metal stuck in the rocker shaft or somewhere in the head would my oil pressure drop? i thought it would go a little higher do to the oil blockage and increase the pressure a little.

AllMotr

i also took the wastegate off too so it would not build any boost.

awdgsx96

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotr &raquo;</TD></TR><TR><TD CLASS="quote">i also took the wastegate off too so it would not build any boost.</TD></TR></TABLE>

Oh ok, I feel better now lol. My bad about jumping all over you, I should've asked.

And when you hit VTEC, you lose some oil pressure because it is used to hold the high lobe or whatever.

If there was a chunk of metal stuck somewhere in the head, you oil pressure might drop because of starvation? There is lots of ways to look at it

AllMotr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by awdgsx96 &raquo;</TD></TR><TR><TD CLASS="quote">

Oh ok, I feel better now lol. My bad about jumping all over you, I should've asked.

And when you hit VTEC, you lose some oil pressure because it is used to hold the high lobe or whatever.

If there was a chunk of metal stuck somewhere in the head, you oil pressure might drop because of starvation? There is lots of ways to look at it</TD></TR></TABLE>
lol no worries, yeah this is pissing me off that i cant figure out what is going on, i guess ill pull the cams out and then pull the rocker shafts out and see if i can find anything. thanks for ur help awdgsx96. if theres anything else that u can think of that might help me or any questions u need from me to help out the situation plz ask.

96 GSR-T

how is your pre-vtec responce with the 8.3:1 comp? I am at 8.6:1 and my car is a dog.

AllMotr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">how is your pre-vtec responce with the 8.3:1 comp? I am at 8.6:1 and my car is a dog.</TD></TR></TABLE>
ahahahaha Its very sluggish but there is no transition in noise or feel when it suppose to hit vtec and with no boost and the skunk2 stg3 cams there should be atleast a noise diff. under full throttle.

integraRS-T

15psi only 260whp that dosent sound right

AllMotr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by integraRS-T &raquo;</TD></TR><TR><TD CLASS="quote">15psi only 260whp that dosent sound right </TD></TR></TABLE>
that cause theres no vtec, i need vtec, imma pull the cams out tonight and check for anything that might be stuck in the rockers or lms or something.

IN VTEC

iTrader: (3)

I usually check my pants to see if VTEC's working or not.

AllMotr

thank you to all for helping i figured out my vtec, it was an oil pressure vessel under one of the caps at the cams and i was clogged, i cleaned it out and vtec is good.