I see way to many people setting their cams based on what someone else has, or recommends. I can't count how many times I've seen someone set their cams to -2, +2 as a good "starting point".
There really is no replacement for going to the dyno and tuning in your car for what works the best for YOU.
In some cases, guessing can really hurt your output. Here's a brief example. I recently took my car to tune in a new set of Crane 14's. We installed them, set at 0,0, and started there.
First, we retarded the exhaust cam to -3 and dyno'd, then advanced it to +3. The red line is advanced, the blue line is retarded. Obviously retarding the exhaust cam was the way we wanted to go.
Next, we put the exhaust cam back to 0, and then retarded the intake cam to -3 and dyno'd, followed by setting the intake cam to +3 and dynoing. The green line is with the intake retarded, the other one is advanced.
So, while a base setting with the exhaust retarded would have been good, advancing the intake cam hurt my power big time. At the end of the day, we had the exhaust cam retarded -12, and the intake cam retarded -9 for the best power output.
what gains did u get at 0,0 over stock and then what gains did u get after adjusting?
over "stock" what?
As for gains after adjusting, it was significant. However, you will have to wait until I go back to work tomorrow, because I don't have my dyno runs at home.
no, John, I did not monitor egt's, as I don't have an egt gauge anymore. I monitor timing, a/f, knock.
As for gains after adjusting, it was significant. However, you will have to wait until I go back to work tomorrow, because I don't have my dyno runs at home.
no, John, I did not monitor egt's, as I don't have an egt gauge anymore. I monitor timing, a/f, knock.
i should have asked:
did u dynoed with STOCK CAMS 1st? reason is to see what were the gains for just slapping in some cams without adjusting. n then what gains did u get after adjusting
ie:
dyno with stock cams:
dyno with crane14s @ 0,0:
dyno after adjusting crane14s:
I was forced to do too many changes to do a before-and-after on just the cams. I swapped a head with the cams, and due to a seized bolt had to swap from a .48 to a .63 exhaust housing.
Here's the gains made by adjusting the cams. The lower one is obviously the 0,0 setting.
looks nice, i've been wanting to put a set on mine, crane 12s, cuz 14s supposebly are not good uptop ?
but a dyno will take a while (too far from here) n i was thinking on doing one of the recommended settings haha owellidonknow oh n what turbo do u have
What cam gears are you using to tune with on the dyno?
And did you tune at UMS? Did you pay or someone hook you up? Once I get back to AZ I need to tune in my cams and fine tune my AFR and boost because I seem to be bouncing around 9s and 10s with the humidity out here. Don't want to touch it while I'm out here because I'm afraid one day I'll be in the 12s. Who needs humidity anyways...
At the end of the day, we had the exhaust cam retarded -12, and the intake cam retarded -9 for the best power output.
Pit,
Doesn't -12 seem a bit far off? Did you deck the block, head or install a different thickness gasket? I thought ~13deg was 1 tooth off...
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Hello guhfluh it appears that you have not posted on our forums in several weeks, why not take a few moments to ask a question, help provide a solution or just engage in a conversation with another member in any one of our forums?
Doesn't -12 seem a bit far off? Did you deck the block, head or install a different thickness gasket? I thought ~13deg was 1 tooth off...
Crane cams (the 12's anyway) weren't really designed for the srt-4. Therefore the opening and closing points for intake and exhaust aren't close to being optimal.
I dyno tuned my 12's at -8 exhaust and -5 intake. ( I am sure there is a bit more in them too, but I ran out of time on the dyno.
gained roughly 30whp from cam tuning. (current settings vs 0,0)
I did not get a chance to do a stock cam versus crane 12's
You are right tho, the timing settings are all dependant on how you set your cam pulleys when you put the belt on.
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STOCK: 233whp/248wtq (dynojet)
13.88 @ 101.1mph
STAGE 3 + bolt-ons, on 91 octane:
344whp/366wtq (dynojet)
11.9 @ 116mph (HOM with slicks)
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Why you NEED to dyno-tune your cams
n i was thinking on doing one of the recommended settings haha owellidonknow oh n what turbo do u have
Linear Mode
