my dynofully built 1.8lsvtec. 11.4 cr setup is in the signature. what the hell does the car stop making power so early
specs on the rs machine cams are
INTAKE:
470 LIFT
272 DURATION @.050

EXHAUST:
450 LIFT
270 DURATION @.050




Modified by riceball777 at 9:24 PM 12/1/2005

 

I would say it could be the header, but with a JDM 4-1 you should be able to push peak well into the 8's.

What are the specs on the cams? I would guess it has something to do with the cams. Have you tried adjusting the cams at all? Try advancing the intake and retarding the exhaust a bit, leaving the cams open a little longer might help you pick up some topend power.

 

ok i added the specs of the cams

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote">
INTAKE:
470 LIFT
272 DURATION @.050

EXHAUST:
450 LIFT
270 DURATION @.050
</TD></TR></TABLE>

0.470 lift = 11.938mm.
0.450 lift = 11.43mm

Stock ITR/CTR cams:

INTAKE lift = 11.5 mm
EXHAUST lift = 10.5mm

Not a very big cam, but lots of duration.
I think that Skunk2's/Blox B's would serve you better.

 

lol peaking 197 at 7200 is a good thing man.

 

man, im peaking at 7700 with ctr cams, and pushing 200 whp on the same dyno you are.

I think there is some sort of restriction in your system. next time you are on the dyno, try open header or something.. your cat might be clogged. with the chart you gave us, at 8500 your car should be making like 206-210 at least. what were you making before the rs cams?

come to think about it, ARE YOU SURE YOU HAVE RS CAMS?? throw another cam that you know of in there and see how it does. its also quite possible that your compression isnt high enough for those cams.

as far as header goes. I would def. invest in a better header. my car would peak at 7500 and drop off just like yours at CAT with the jdm 4-1. i swapped out to a toda, and i gained hp and trq everywhere, and my car carried power out to 8500. it was a HUGE difference. i have dynos if you need a comparison.

definately check out what the heck kinda cams you got and make sure the specs are accurate. it sounds like you might have a ctr cam in there. cuz you are making almost the exact same power i am.

I still dont understand why you say your car is so slow. my setup is almost like yours, but id say my car is decently fast.

 

yes i'm sure they are rs machine cams because i bought it stright from thr machine shop. i did have ctr cams before and these cams feel way faster than the ctr cams. shon played with the cam gears and still couldent get it to make any more power higher. there really cant be any restrictions i basically have all the bolts ons. 2.5 itr header with 2.5 piping all the way back and the carcound cat is new. oh wells. just wanted to see if there was anything left in this before i go turbo

 

i ran a 14.6@96mph on ctr cams in my lsvtec. stock head, 11.3 compression. you SHOULD be doing at least what i am. i'm makgin 200hp on shauns dyno. there is no reason you should only have a 15.2

put on some smaller tires and run again.

im going with drag radials, and buddyclub cams and looking for 13's when i can get my 60ft time down to 2.0

 

well i trap 15.2 at 94mph with my 17 inch wheels so will some smaller wheels i should be arond the same trap speed as you. the low eta is just because i dont know how to launch i guess but even with small wheels with a trap speed on 96mpg is only good for low to mid 14's. but more importantly is the car feels slow as ballz to me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote">well i trap 15.2 at 94mph with my 17 inch wheels so will some smaller wheels i should be arond the same trap speed as you. the low eta is just because i dont know how to launch i guess but even with small wheels with a trap speed on 96mpg is only good for low to mid 14's. but more importantly is the car feels slow as ballz to me </TD></TR></TABLE> it's the tranny. i had a 185hp ls/v and it felt like **** also. put a 92gsr tranny and felt a BIG difference. you might just want to throw a 4.9 final drive on the tranny you have right now.

 

maybe stupid but what about air/fuel ratio at the higher RPMs?

 

Clutch slipping maybe?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote"> i guess but even with small wheels with a trap speed on 96mpg is only good for low to mid 14's. but more importantly is the car feels slow as ballz to me </TD></TR></TABLE>

well if you are comparing with a turbo car, there is no comparison of course its going to feel slow. definately get your setup checked out. 96mph is good for mid-low 14's on street tires. with CTR CAMS.

i'm swapping in BC4's and ported head, shooting for 13's at 100 or more on drag radials. If you are looking for anything faster than that. sell your motor and go 2.0L, or just give in and go turbo. our cars are heavy.

 

You cams should be good for 11k rpms. If they have 270 duration at 0.050. I don't see how though. I've seen the web cams and they aren't that big.

Must be a restriction somewhere else or you don't have enough valvespring.

 

ah valvefloat?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">You cams should be good for 11k rpms. If they have 270 duration at 0.050. I don't see how though. I've seen the web cams and they aren't that big.

Must be a restriction somewhere else or you don't have enough valvespring.</TD></TR></TABLE>
what do you mean i dont have enough valve spring ? not stiff enough?
i'm running the rs machine valve springs and ti retainers with their cams, so it should work since everything is from the same company
i cant amagine there being a restriction. all the machineing was done at rs machines. the heads ported, aeb im also ported, jg 65mm tb, jdm oem itr 41 header with 2.5" carsound cat with full 2.5" piping and a 2.5inch magna flow straight through muffler.
i cant even buy anyting else for the damn setup other than a better header which i dont plan to do

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rocket &raquo;</TD></TR><TR><TD CLASS="quote">You cams should be good for 11k rpms. If they have 270 duration at 0.050. I don't see how though. I've seen the web cams and they aren't that big.

Must be a restriction somewhere else or you don't have enough valvespring.</TD></TR></TABLE>

but then again, he has no idea what his lobe centers are. Im guessin they wer just "installed" and played with on the dyno. Cam timing has alot to do with this, as you know Rocket. the closer the lobe centers are the less top end that motor will make. Cant really tell without knowin what the cams are set at.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by riceball777 &raquo;</TD></TR><TR><TD CLASS="quote">
what do you mean i dont have enough valve spring ? not stiff enough?
i'm running the rs machine valve springs and ti retainers with their cams, so it should work since everything is from the same company
i cant amagine there being a restriction. all the machineing was done at rs machines. the heads ported, aeb im also ported, jg 65mm tb, jdm oem itr 41 header with 2.5" carsound cat with full 2.5" piping and a 2.5inch magna flow straight through muffler.
i cant even buy anyting else for the damn setup other than a better header which i dont plan to do </TD></TR></TABLE>

check your parts, maybe you got some shitty stuff. i'm not saying tthey jipped oyu.. but that looks really low fot he mods you should have

 

the problem is.. if you are running the stock ls length rod you have a rod ratio of 1.54.. this means your motor is not good for rpm.. the piston speed is greatly increased and flows more air down at lower rpm.. the cam you have is too big and doesnt want to start flowing untill higher rpm.. you have a bottom end for low rpm torque and a top end for high rpm power.. doesnt mix.. change you rod ratio for those cams and you will see better results..

 

i forgot to mention you also may not have enough compression for those cams..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DC2jdmIntegra &raquo;</TD></TR><TR><TD CLASS="quote">i forgot to mention you also may not have enough compression for those cams..</TD></TR></TABLE>

how do you figure???????

 

because i dont know the compression the cams require.. i dont know what the manufacture calls for...

 

i personally don't see why you need a throttle body at 65mm for a 1.8L. i would just like to know the valve timing events, and instead of moving that peak hp up in the rpms, why don't you try throwing on a smaller throttle body, play with intake lengths, diameter, and try a pressurized system. then worry about the header, because there is no way the JDM 4-1 with the inside 2.25" diameter collector is restricting top end power. but what's top end power anymore....now ppl try to make peak hp at like 8800-9000 rpms, and they want a 9000 rev limit...that doesn't even work out concerning gear ratios, especially 1st - 2nd shift.

why not aim for over 200 hp but at the same rpm range you are at now. Better yet, why not just put a B16 throttle body, P30 manifold on there, and try one thing at a time. CTR vs RS cams.

 

The throttle body is just like everything else in the induction/exhaust system. It needs to be matched to the application. Some 1.8's could benefit from a 65mm throttle body. 64mm is as big as i would go with my combo.

 

Okay, put a RMF header on it and see what you get.