well i got a 1st gen b16/y1 tranny
3 inch short ram
maxbore 64 to 62 mm taper TB
AEBS IM
STR fuel rail
B&M FPR
full supertech valvetrain
aem cam gears
sk2s2 cams
dc-4-2-1
si catback
stock block
vafc
now i took it to get tuned on the dyno today and it seems that im way overcaming...i was getting 144 whp before the cams were installed...now im making 127 whp and 89 lb/ft torque....boy does this suck...well im looking to get ctr ot itr cams now as they tend to work best for my application i still cant believe i lost 17 peak whp...and torque is just as bad...oh well.. for me

 

wow.... stock block....1st gen b16....bad rings? maybe from the time you dynoed till now?

 

nope everything is good...cams are just way too big...but im still gonna drive around on these until someone buys them from me..or i find some ctr/itr cams.

 

well good luck!

 

can you post a dyno ? sounds like your vtec not working to me ... with that big cam in a b16a you'd need to raise vtec to at leasty 7000rpm ... i've used big cams like that in stock blocks with head milled maybe 20 thous and they worked fine (high 160;s at wheels).

greg

 

<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">nope everything is good...cams are just way too big...but im still gonna drive around on these until someone buys them from me..or i find some ctr/itr cams.</TD></TR></TABLE>

They are a little too large for a stock compression B16, but they will NOT do that to your power figures, thats for damn sure. If your engine is in good shape then you have one hell of a tunning issue on your hands, period. Sound alot like cam timing is off to me. You could be dealing with reversion, and lots of it.

 

Let's not forget that the header and exhaust are rather big restrictions at this point.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CHEETAH &raquo;</TD></TR><TR><TD CLASS="quote">can you post a dyno ? sounds like your vtec not working to me ... with that big cam in a b16a you'd need to raise vtec to at leasty 7000rpm ... i've used big cams like that in stock blocks with head milled maybe 20 thous and they worked fine (high 160;s at wheels).

greg</TD></TR></TABLE>
i dont have a graph....when vtec crossed over...it lost power..they set my vtec to 6400....yeah im very dissappointed with the dyno results...so i dont know what to do...the guy i took it to is a trusted tuner so i just dont know

 

I'd say it's a tuning issue. If you can get the dyno sheets they would help greatly.

 

well the guy never gave me a dyno sheet..he was just showing me on the computer...

 

 

<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">well the guy never gave me a dyno sheet..he was just showing me on the computer...</TD></TR></TABLE>

Its one of two things. Either the tune is ***, or something is seriously wrong with your engine. It would make sense to rule out the engine by doing a leak down/compression test first. Verify your timing is correct, timing marks on cam gears line up, no loose vac lines, etc. Once you have ruled this out and are confident with your findings, it leaves the tune. Like I said, the cams are a little large for a stock compression B16. Expect losses in low/mid range power.. but peak numbers SHOULD have gone up... and by a decent margin. Remember though, peak numbers aren't what matters the most.

 

You are running skunk2 stg2 cams on 10.2:1 compression ratio ?
What kind of dyno did you put your vehicle on ?

 

sure the dyno was reading right? what t ype of dyno was it. Ive seen some VERY low numbers on mustang dyno's...(for example...the car we prototyped our h22 kit on made ~230whp on our mustang dyno ...we brought it to a local dynojet to get "industry standard numbers" and it put down 312whp)..

 

well i had a very similar day this week
Although mine Dynoed at 159/110
Crower Stage 3
Rcket Valvetrain
And 12.5 Comp

So i think its the tunning and the fact that im running stock mani and TB

But we will see

 

Im using s2s2 with 9.2:1 cr and ive 175whp@8000 and 132tq. If i ran smaller cams than that im pretty sure youll get lower numbers. Its in a stock block B20Bvtec. I know its a different motor but it just shows you that you can be running cams even below the ideal listed compression. So something else might have caused your dyno numbers to go down. Hope that helps.

 

how much was your cam timing was adjusted? possible that your valves kissed the pistons lightly? now your losing compression...maybe? and is your comp ratio 10.2?

 

its probably the cat and a bad tune. i've seen cars lose 25whp due to the cat being clogged. no disrespect, but your set up is whack. think about it....you have a decent amount of air entering the motor (SRI, T/B, IM, Cams), but, your exhaust it preventing the motor to exhale. lastly, those cams are a bit too big. i'm not saying its the cause of your low numbers, i just know that the b16 does not like big cams....anyway, let me get this right....dc 4-2-1 with 2" collector, an oem cat and oem Si exhaust?

 

no way kid thats defenally something else,, because of cams u not going to loose horses,, that BS.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">You are running skunk2 stg2 cams on 10.2:1 compression ratio ?
What kind of dyno did you put your vehicle on ?</TD></TR></TABLE>
well with the flat top valves maybe 10.3 we put it on a dyno jet

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16C1 &raquo;</TD></TR><TR><TD CLASS="quote">its probably the cat and a bad tune. i've seen cars lose 25whp due to the cat being clogged. no disrespect, but your set up is whack. think about it....you have a decent amount of air entering the motor (SRI, T/B, IM, Cams), but, your exhaust it preventing the motor to exhale. lastly, those cams are a bit too big. i'm not saying its the cause of your low numbers, i just know that the b16 does not like big cams....anyway, let me get this right....dc 4-2-1 with 2" collector, an oem cat and oem Si exhaust?</TD></TR></TABLE>

yeah the dc 4-2-1 has some of the meanest dents i have ever seen in em..they almostare half way in...yeah 4-2-1 to oem cat to si catback...i know that the exhaust is restrictive but cmon i shouldnt be losing power like that...

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eg6hatch3 &raquo;</TD></TR><TR><TD CLASS="quote">no way kid thats defenally something else,, because of cams u not going to loose horses,, that BS.</TD></TR></TABLE>

yeah i figure that the exhaust system is holding me back some but it should not make me drop that much power...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid93Eg &raquo;</TD></TR><TR><TD CLASS="quote">

Remember though, peak numbers aren't what matters the most.</TD></TR></TABLE>
i know that...i lost power throughout the whole powerband..i only posted peak numbers so you guys could see how much of a drop there was...were really busy at the shop right now so im not gonna have time to throw in the old cams...i think im just gonna wait a while until someone buys these sk2s2's off me or i can find some ctr/itr cams...

 

anybody got any ideas?

 

Your whole setup is bad for cams that big. after some tuning you might see some small gains, but all of your 'response' mods are hurting you. redo your i/h/e setup, and it's time for some tuning even if it's just a vafc. Like others said, aside from that, something else might be wrong. check your cat too.

 

<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">anybody got any ideas?</TD></TR></TABLE>

Why even bother asking people for ideas when you just simply plan on selling the cams? Waste of time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hybrid93Eg &raquo;</TD></TR><TR><TD CLASS="quote">

Why even bother asking people for ideas when you just simply plan on selling the cams? Waste of time.</TD></TR></TABLE>

well who knows when someone will buy em from me...for all i know i might keep em...well it looks like i definitely need a whole new exhaust set up...i really like the an-r compact...and i will probably have a muffler shop build me a a cat less exhaust...do u guys recommend 2.25 or 2.5 inch piping for my application?
i dont think really believe that intakes make much power so i will probably stick with the short ram...

 

2.5". short ram is fine, just get a decent filter and consider building a heat shield. an-r compact is decent. with cams that big i'd spend the remainder on dyno tuning after you have the setup at an ideal point, or street tune if you know what you're doing.