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Secret?!?! 1 Tooth Off On Exhaust Cam ... Pro's/Con's?

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J

Jallen

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Discussion starter · #1 ·
Hello All...

Spoke with someone who has been moding out dsm's for about 13 years now.(he knows his $shit)... and during our conversation, he let me on a little secret that most people dont know.....

when doing a timing belt install...align up the cam gears as normal, but on the exhaust cam...make it one tooth off(upwards, couter clockwise).. and what this does it gives you 20 more HP above 5000 rpm...

has anyone heard of this before/has anyone done this? pro's/cons?

thanks...

J
 
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#2 ·
I heard the same thing from the guys at TRE....they told me it works on a stock car up to heavily modded car. You are supposed to advance the base timing from 5 to 10 degrees when you do it from what they told me. We tried it on my friends car who has adjustable cam gears and he said the car didn't really feel any faster...in fact he said it felt slower....although he was having tuning issues at the time and problems w/ knock. On a well tuned car it might make more power.... however i wouldn't play with my cam timing unless i was on a dyno to verify it.
 
#3 ·
I guess I never tried that but a con would be if your belt slipped. Lets say if it slipped 2 teeth at stock position ok.. Your valves might be ok. but if you had it advanced by one tooth already and it skipped 2 teeth it would actually skip 3 teeth total. This could mean the difference between bent valves and not bent valves. you make the choice.

Wow, that was difficult to type to make sense!!! ha:D
 
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Discussion starter · #4 ·
yeah, it was jon from TRE.. Hehehe. goin down there on the 16th to pick up a 16g Small

a friend of mine, did his t-belt..and he thought that he had it aligned right....assembled everything and ran his car for a day..he said that he had ALOT more pulling power at higher revs, checked the alignment the next day, and it was off by one tooth..so he fixed it..

perhaps it really does work...
 
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#5 ·
i might have to try this once i get the egt guage and everything hooked up since i have a t-belt job coming up in a few miles anyways.
 
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#8 ·
Up / Counterclockwise as in:

If you are looking at the timing mark at 3:00 on the exhaust cam gear, and move that mark UP one tooth. That would mean you are rotating that gear counterclockwise.

Kinda interesting. Setting it up one tooth off this way would mean your exhaust cam is retarded about 7 degrees (one tooth = approx 7 degrees). Would result in more complete combustion since you're waiting a bit longer before opening the exhaust valves. Could lead to more power..
 
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#9 ·
James92TSi said:
Up / Counterclockwise as in:

If you are looking at the timing mark at 3:00 on the exhaust cam gear, and move that mark UP one tooth. That would mean you are rotating that gear counterclockwise.

Kinda interesting. Setting it up one tooth off this way would mean your exhaust cam is retarded about 7 degrees (one tooth = approx 7 degrees). Would result in more complete combustion since you're waiting a bit longer before opening the exhaust valves. Could lead to more power..
Click to expand...
Another thought, I think this is all about scavenging, since exhaust valves would still be open when the intakes open.

The best of both worlds would be to change out the cam for a longer duration one w/ adjustable gears.
 
#11 ·
itdood said:


Another thought, I think this is all about scavenging, since exhaust valves would still be open when the intakes open.

The best of both worlds would be to change out the cam for a longer duration one w/ adjustable gears.
Click to expand...
i think that's the point though is its a simple way to get a change w/o buying those items. the only reason i'm considering it is because i can't afford to buy a new set of hks cams right now.
 
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#13 ·
hey thanx for clearing that up for me. If this really works this should be a new freemod added to vfaq or sumthin. Imma wait to do this just because im about to put a big16g in and im going to run with that for a little bit, and then do the cam gear adjusting so i can feel the difference, cuz if i do it right now and then put the 16g in, im going to feel faster no matter what cuz im getting a bigger turbo, but after gettin used to how the 16g feels then ill do that cuz then ill be able to feel if there's a difference. thanx again
 
#14 ·
cam

If you have ever played around with cam timing you would realize that you all you are doing is moving the powerband around. Yes you can gain a little up top, but you will be loosing some HP at lower rpms. If you do it on the dyno you will notice that the area under the curve is about the same, just that the curve is a different shape. No free HP.

With that said, it is possible to make more peak HP and be slower.
 
#15 ·
ok so what about with a gs-t like mine? Horses in the low RPM band spin my wheels in first gear, BUT after first gear i don't go back below 4000 rpms after shifting if im racing, so wouldn't moving the h.p to higher rpms help out a lil bit by not having first gear spin the tires at like 3k rpm because the power band has been moved to a higher rpm range, but then after that bein higher in the rpm's and being maybe right at the start of the "new higher" power band? i hope that makes sum sense, it does to me but sumtimes i can't speak what im thinkin all that perfectly. (never was good in english)
 
#16 ·
i think we all realize we're moving the power band but i have plenty for partial throttle cruising and only use 4000rpm+ when racing anyways so it works out great in my case especially since i'm fwd and alot of my races are from the roll.
 
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#17 ·
I'm not saying that you shouldn't try it or that it can't possibly give you more peak HP. It can. I'm just informing people that it is not free. You give up something to gain something. You make the judgment if its right for you.

Also, make sure your exhaust temps don't get out of hand.
 
#18 ·
TIMING

THIS is really not a good idea. Since you are in effect retarding your timeing AND advancing your timing at the same time. What happens is your car will run like a vannilla gorrilla and eat spark plugs like anna nicole. Trust me i have done it. Also this increases cylinder head compression and increases heat in the head.
 
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