hi i have jus rebuilt my motor got it all back together and it backfire out the intake.ive seen a thread on here about stage 2 cams being a little iffy.i think the cam timing is off but the machine shop insists it right.i have titan adj. cam gears and exhaust is adj.about1degree and intake about 8 degrees. the longest ive had it running is about 10 sec..ive messed around with cps all i could an sure its position is right.i was also wondering if it wil run with stock engine management because i was want to until i break it in. i know it wont wont work if i hit boost but not going to until i get my aem ems.i really need to figure it out.thanks walt.fully balanced motor,turbonetic 60-1 turbo,wiseco pistons,eagle rods,hks 1mm stopper h.g,bc stage 2 cams,titan gears,greddyt-belt and 180 compression all six.
do u need ajustable cam gear w/bc stage 2 cams
- Thread starter suprawalt
- Start date
My TRD cams at 272/9mm needed to be adjusted to idle decently. At 0/0 the idle sounded like a Domestic drag racing V8. I could barely pull -5 vacuum (stock is -18). I realized that I had way too much overlap in the cams so I dialed in more LSA with the adjustable cam gears and now I pull -20-25 at 800rpm.
I went with: Exhaust Advanced 4*; Intake Retarded 2*
When you say 1* for exhaust and 8* for intake you failed to state advanced/retarded.
Pull off the black cam cover to verify that the cams are aligned with the crank at 0*TDC. If that is well and your ignition timing is 10*Adv than you might want to check your vacuum and look into adjusting your LSA.
LSA is Lobe Separation Angle. If you were to map the exhaust and intake lift vs Crank Angle on a graph then the intersection of the exhaust and intake lift would show you the duration of the overlap. You can reduce overlap by making the exhaust open and close sooner or by making the intake open and close later, or both. To get more overlap the process is the reverse.
I went with: Exhaust Advanced 4*; Intake Retarded 2*
When you say 1* for exhaust and 8* for intake you failed to state advanced/retarded.
Pull off the black cam cover to verify that the cams are aligned with the crank at 0*TDC. If that is well and your ignition timing is 10*Adv than you might want to check your vacuum and look into adjusting your LSA.
LSA is Lobe Separation Angle. If you were to map the exhaust and intake lift vs Crank Angle on a graph then the intersection of the exhaust and intake lift would show you the duration of the overlap. You can reduce overlap by making the exhaust open and close sooner or by making the intake open and close later, or both. To get more overlap the process is the reverse.
With the 264 BC cams I couldn't get mine to idle at all with the stock cam gears.
Using fidanza cam gears, I added 4 degrees to the exhaust and retarded 2 degrees from the intake. It then started idling a bit better. I then retarded 2 more degrees from the intake cam and it now idles pretty good. So it's at 4 degrees advance on the exhaust cam and 4 degrees retard on the intake.
I then found out that I was off 1 tooth on my CPS. So I was running about 22 degrees at idle. I'm not sure how that affected everything, but the idle is about the same with the timing corrected.
Using fidanza cam gears, I added 4 degrees to the exhaust and retarded 2 degrees from the intake. It then started idling a bit better. I then retarded 2 more degrees from the intake cam and it now idles pretty good. So it's at 4 degrees advance on the exhaust cam and 4 degrees retard on the intake.
I then found out that I was off 1 tooth on my CPS. So I was running about 22 degrees at idle. I'm not sure how that affected everything, but the idle is about the same with the timing corrected.
I found that its easier to get the car to idle with more advanced timing, but I had it high by accident as well.
Also, MRSUPRA, what vacuum are you pulling at idle with it at Ex 4A and Int 4R? And what RPM are you idleing at?
Also, MRSUPRA, what vacuum are you pulling at idle with it at Ex 4A and Int 4R? And what RPM are you idleing at?
Because the Spec Sheet was never in my hands and the representative of the Cam Manufacturer who has been working there the longest denies ever making a Cam for this car despite the pictures I sent to them.
http://www.supras.com/pipermail/supras_supras.com/2004-August/005731.html
Advance Exhaust Cam Only: Reduces overlap and increases
blowdown by opening the exhaust valve sooner. This will, most
likely, shorten the power stroke. Usually helps top-end power at
expense of lower mid-range. Most street engines do not like this,
but it will help to smooth idle.
Retard Intake Cam Only: This starts overlap later and, therefore,
reduces overlap. This helps top-end at the expense of lower mid-
range. Most street engines do not like this, and idle suffers.
Works well on ported engines and undersquare engines (the stock
MarkIII Turbo is nearly square - the stock MarkIV is square).
So, to answer your question. I don't really know, but I assume that it does.
Advance Exhaust Cam Only: Reduces overlap and increases
blowdown by opening the exhaust valve sooner. This will, most
likely, shorten the power stroke. Usually helps top-end power at
expense of lower mid-range. Most street engines do not like this,
but it will help to smooth idle.
Retard Intake Cam Only: This starts overlap later and, therefore,
reduces overlap. This helps top-end at the expense of lower mid-
range. Most street engines do not like this, and idle suffers.
Works well on ported engines and undersquare engines (the stock
MarkIII Turbo is nearly square - the stock MarkIV is square).
So, to answer your question. I don't really know, but I assume that it does.
I just fired up my engine with BC 264 Cams.
The engine has been professionally rebuilt and the cams have been degreed but the cam gears are both set at 0.
The engine idles at 750 rpm but runs a little rough below 2000 rpm.
The engine has been built with JE pistons in one oversize and a HKS 2.0 mm stopper.
The engine has been professionally rebuilt and the cams have been degreed but the cam gears are both set at 0.
The engine idles at 750 rpm but runs a little rough below 2000 rpm.
The engine has been built with JE pistons in one oversize and a HKS 2.0 mm stopper.
im looking to put some na cams in my 90 turbo, ive been told you can keep the stock cam gears, but i wasnt sure, is this true, also, anything else i should know?
thanks
thanks