timing is good but no power???

[dillyumpshous]

ok i just did the timing and i know for a fact i did it correctly. first i made sure it was dead center by removing the valve cover. made sure the links are lined up with the dot and checked if it was on 2nd mark to the left on the crank pulley. removed the cas made sure i rotated to the 2nd notch to the right. i used frsport faqs. now i started the car up with no problem. let it warm for about 10-15 min. check the timing with a timing gun. adjusted the cas so that it lines up 2nd mark to the right. but before doing this i made sure the tps was set correctly as well. .46 when closed. ok timing is set correctly as well as tps. the car idles at 8. but the problem i have now is the car doesnt have power. i drive it around the block for a test run and the car feels like its holding back alot.

im thinking it could be my...
valcume lines
maf
boostleak

this is how i setup my valcume lines.
1. fpr to the tb
2. tb to a T fitting (boost gauge, another T fitting) then bov and actuator
3. the bottom nipple is closed on the tb

as for the maf im using a sr maf
the wiring was done correctly

boost leaks???
i dont think i have any i made sure my clamps were on tight.
i will double check though.

so my only concern is i think its my valcume lines. other then that i hear alot of surge comming from the filter when reving or driving. the bov opens so i know thats working. if im right i think its my valcume lines. some how i also think my wastegate isnt opening up. its a new gt28r turbo.. please help

[jspeedm]

some how i also think my wastegate isnt opening up. its a new gt28r turbo.. please help

or maybe it is staying open and not allowing you to build boost. do you have a boost gauge and what is it reading?

[dillyumpshous]

yes i do it reads 20 psi below 0.. while driving i dont think it passes 5psi above 0.. make any sense?? when i try flooring it the car feels like its not boosting or theres no power above 2.5 rpm.

[jspeedm]

try hooking up the actuator to the nipple on the bottom of the tb by itself. also do you have a new clutch? sometimes a slipping clutch can feel like engine power loss.

[dillyumpshous]

yes clutch is new its a exedy stage 1. no slipping at all tho. i will do the actuator to the nipple right now and ill let you know what happeneds.

[rc1honda]

If your wastegate wasn't opening in theory you should have infinite boost. Maybe something is keeping open. Maybe you have the spring to streched? Can you adjust your wastegate actuator? Usually there is a little pin on one side of the spring that you can move to allow more pressure on the wastegate. More pressure more boost. Also check your intercoller piping. Make sure you tightend them down with a socket wrench cuz you might have a lot of little boost leaks and not one of them holds enough pressure to blow the pipe off.

[jspeedm]

is the flwheel new also or at least resurfaced?

[jspeedm]

i don't know why i didn't think of this before, but did you by chance check you exhaust back pressure? do you have a cat? your exhaust might be clogged.

[dillyumpshous]

jspeedm so far... i put the actuator valcume line to the bottom nipple on the tb. still the same problem. i was reading the boost gauge and dammn it look like it was spiking.

i do have a exhaust leak... but its on the muffler. theres a big hole on the canister very close to the exhaust tip. its loud but it shouldnt make that huge of a diffrence.

my flywheel yes its redsurface. i made sure i did the clutch flywheels yada yada correctly and torque specs as well.

as for my intercooler im doing that right now. then im gonna put back the vacume like the way i posted in the first post.

one more thing if i advance my cas my car runs fine but the marks on the crank is way off an inch or more. then my idle is get way off and i cant adjust it bc its tighted all the way. the only other way is to lower the throttle cable and yada yada. but still i wouldnt risk on driving or drifting with my timing off like that. so im letting my car cool down right now and i let know what happeneds back in an hr.

[dillyumpshous]

update.. tighten my clamps for fmic and cant really tell any diffrence. as of rite now i advance my timing about an inch away from the far right of the crank pulley. car runs better but i think its still holding back a lil. but if i advace it anymore (till the point where cas cant advance anymore) then my car runs super fast. just how i think a s15 should perform. but im not taking any chances.

so im running out of ideas... is there any other ideas before i give up.

this is me with my shitty ass timing
http://www.youtube.com/watch?v=a6pWgl5v4gs&eurl=http://profile.myspace.com/index.cfm?fuseaction=user.viewProfile&friendID=427864121&feature=player_embedded

you can hear the rpms drop so i clutch that ish to keep drifting.

[jspeedm]

make sure your exhaust is not plugged up.

[dillyumpshous]

make sure your exhaust is not plugged up.

what do you mean by not pluged up?

[jspeedm]

if you have a cat, it can stop air flow when it goes bad. that= power loss

[dillyumpshous]

no cat.. its pretty much a straight 3inch

[jspeedm]

well, i can't think of any thing else. sorry.

[rc1honda]

Next i would say make sure your plugs and coils are ok. If they are check your injectors. Check your fuel pressure and check the fuel filter. If your timing is right on then maybe it's a spark/fuel issue. Also make sure your maf is good in the wiring and maybe you have to clean it you said it was good but just check the ground. Also check the spark plug gapping.

[dillyumpshous]

injectors OK
bnib 300zx fuel filter OK
greddy spark plugs heat range is 7 i checked gaps when i first got the motor and it was OK just cant remember where there gap at right now.
dont know how to check fuel pressure and dont have money to by a gauge.
as for the maf the wiring was already done and came off a running car. i also have a spare sr maf and counldnt tell any diffrence.
ground is OK
ive several sr owners with there timings off by and inch. so im guessing its ok....

[darius_tii]

im in a very similar situation as you
almost exact actually
im very curious to see what your problem is

[darius_tii]

re do your vaccum lines
that should help it

[dillyumpshous]

re do your vaccum lines
that should help it

are yous saying get new lines or re route them?

[darius_tii]

you can do either i guess
just make sure they are all good lines and routed correctly
probably have a leak somewhere
If not check your BOV and anything else that would give you a boost/vaccum leak
thanks
Darius

[dillyumpshous]

replace lines with new T fitting as well.
same problem
tighten all my couplers
same problem
boost gauge reads 18-20 below zero at idle
boost gauge reads 5psi when flooring it and wont go higher.
then i try unplugging my bov. still same problem.
im thinking should recirculate the bov????

its funny bc if i advance my timing my car runs alot better. but the idle jumps alot.

does anyone know whats the stock boost for s15 turbo...? ive search along time ago but i cant seem to find thread for it.

[darius_tii]

5 psi is low
you have a boost leak somewhere
your BOV may be faulty or possibly something else of that nature
you should be boost 7lbs stock
check everything out.
you must have a boost leak somewhere

[godsmack]

i think that it's your boost actuator. do u have an aftermarket one or stock? if aftermarket it might be set at that low of a boost. if it was a vacuum leak you would not show -psi on idle. or you might need to run the vacuum lines different but that i don't know much about so i'd check the actuator and if that's not it look up the fsm and run vacuum lines according to that and see what happens.

[jspeedm]

if the springs in the wastegate actuator are old, they could be wearing soft allowing the wastgate to open at a lower boost level.

[dillyumpshous]

its a stock actuator that came with the s15 turbo.. its brand new soo i dont think anything is wrong with that.
well its been a week now and i believe my car does have a boost leak somewhere.
i advance my timing... adjusted the iavc.... and the timing is off by an inch to the right...
anyways the car seems to drive alot better... but it looks like my boost guage is spiking..
when im flooring it in first gear it stays on 5lbs but then it will spike quickly to 10lbs.
is that normal???
well tomorrow morning im going to put the bov on the cold side and see if theres any diffrence and retighten my couplers.
hope this solves the probelm. whatever condition it is im still gonna drift this saturday drift event.

[Vatche]

stock boost on a s15 turbo on a redtop would be 7-8lbs.

i run -25 lbs at idle usually sometimes it will go to -22.

point being 18 sounds a bit off.

i had my wastegate get stuck once, but i had full boost instead of none, you can try undoing the c clip on the actuator arm and making sure the wastegate door moves freely.

but i dont think thats your problem. you have some kind of vacuum leak or intercooler piping leak. bov, intercooler itself? those are the things that would cause your problem.

what kind of boost guage do you have?

if when your flooring it, its at 5lbs of boost until around 4200 rpm when the turbo fully spools and then it spikes to 10lbs until 7k or so. then that means your boosting 10 lbs and its normal, but your setup is not perfect so it spikes boost.

but if your at 5k rpm at 5lbs of boost then it hits 10lbs of boost all of a sudden thats weird, maybe check your wastegate i dont know

[dillyumpshous]

sr20detman

thats exactly what my car is doing..
so i guess everything is normal??? just not the right setup???
ok well that being said i still believe i have a boost leak.
its just a bitch finding where.

[jspeedm]

if you know anyone with a smoke machine, you can seal off the intake, pump smoke in, and see where it comes out. there's your boost/vacum leak.

[dillyumpshous]

if you know anyone with a smoke machine, you can seal off the intake, pump smoke in, and see where it comes out. there's your boost/vacum leak.

LOL thats a great idea but dont know anyone that has one.
i made one but doesnt work good with my 10 dollar tire pump.
cant see how many lbs or psi its holding....