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Old 07-31-2002, 12:30 PM   #1
BMW Man in 2.5RS
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Default The age old cam question

ok Heres what im wondering...does anyone have the stock cam specs and the spicy cam spec for the single overhead cam engine from cobb tuning. I have looked in this and im not sure if im right. They increase intake and exhaust lift but decrease the duration. Im not sure if this is correct or not and that pretty much what ive found with the search.

Next the spicy cams use the same lift as the street cmas just a longer duration which provides the lumpier idle. I remember seeing a post about how the spicey cams arent worth it because they give to many probs with the ecu and dont gain much over the street cams. What are you guys thoughts on this and doyou have any dynos between the two.

Would i gain any advantage to rasing my redline with the street cams becuse the cobb dyno shows a horsepower peak of 19hp at redline for these cams which could me an thee is more to be gained from a higher redline.

Last question am i going to encounter a lot of problems if i have cams grinded for me from colt cams which use stock duration (which if i read it right is higher then the spicey cams) and the same lift as the spicey and street cams.

I know this is a lot of questions so just answer what you can if you can. thanks...Joe
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Old 07-31-2002, 02:45 PM   #2
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I do belive that the Spicy cams will have a noticeable difference if a person has headwork also. Without headwork, the cams will only help so much....

RawCode
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Old 07-31-2002, 03:47 PM   #3
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Default Re: The age old cam question

does anyone have the stock cam specs and the spicy cam spec for the single overhead cam engine from cobb tuning. I have looked in this and im not sure if im right. They increase intake and exhaust lift but decrease the duration[/quote]

I dont have the exact specs but the spicy cam has increased lift and durations. The street cam is almost only a lift increase. (very slight duration difference)

[/b][/quote]
Quote:
I remember seeing a post about how the spicey cams arent worth it because they give to many probs with the ecu and dont gain much over the street cams.
Okay, the Spicy cams are really intended to be used with more work done to the car. you need a full I/H/E + possibly headwork and raised redline to really take advantage of those cams. On a lightly modified car, they probably arent that much different.

[/b][/quote]
Quote:
Would i gain any advantage to rasing my redline with the street cams becuse the cobb dyno shows a horsepower peak of 19hp at redline for these cams which could me an thee is more to be gained from a higher redline.
Maybe a small one. I doubt the street cam will need much more than another 500 rpm. Or at least it wouldnt be wothwhile to go any higher.

[/b][/quote]
Quote:
am i going to encounter a lot of problems if i have cams grinded for me from colt cams which use stock duration
Sounds very similar to the cobb spicy cams. Are the alot cheaper?
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Old 07-31-2002, 09:44 PM   #4
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Ok i dont know if anyone knows this but unless cobb told me wrong the duration on both the spicey cams and the street cams is lower then stock. I think stock is somthing like 232 degrees and the street cams are 211 and the spicey cams are a little bit more. Thats why im just wondering about that.

I plan on getting headwork no matter which cam i get but how high would i need to raise my redline in order to really take advantage of the spiceys and which way would be the best to raise it. I posted about a reprogrammed ECU but only got one response. I dont want to go standalone just for some cams then spend a bajillion dollars every year in dyno time every time the seasons change. I will get an afc for fuel control and if i need it ill get an itc also but what would be the best way to raise my redline. Thanks Joe
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Old 07-31-2002, 11:07 PM   #5
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7k should be plenty for the spicy cams. At that level you probably dont need new springs unless you plan on spending alot of time up there. But if you're doing the head work, might was well do the springs.

Supposedly there is a add on module for the unichip that will allow you to raise you redline for a total cost of ~$800. Of course for not a whole lot more you start getting to stand alone prices, your choice. and for dyno time. Buy a road dyno. $150 and good enough to tune with.

Edit: supposedly japanese auto can reprogram your ecu to raise it as well. ~$500 to do it that way.
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Old 08-01-2002, 12:06 AM   #6
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if your getting headwork you need to get the vavletrain package also to avoid valve float @ 7200 RPM's IIRC
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Old 08-01-2002, 02:02 AM   #7
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When you say vavle train package what do you mean. I plan to get springs and retainors but do i need anymore then that. Does anyone know what these cams peak at because i would like to know cuz id like to rev it maybe 500 past the HP peak so i fall into a nice power ban. Thanks...Joe
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Old 08-03-2002, 03:05 PM   #8
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The torque curve takes a nosedive around 7000 RPM. It doesn't matter what cams you have at that point becasue it is the stock intake manifold that is the cause. It won't flow any more air. If you put independent throttle bodies on it, you could rev it much higher.

cheeRS,

Greg
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