mild cam for low end
11-24-2014, 04:43 PM
#1
mild cam for low end Thinking of something like this for a mild cam: 224/220 117+4, lift under .600, with non-agressive lobe profile.
This is for a street-only car that's stock internals with catback exhaust. Want a cam that produces a great low-end torque curve to 5K rpm. Don't care about over 5K (but don't want it to fall off a cliff), not concerned about getting max peak HP, prefer a flatter curve. Also want a stock idle. I do my own tuning so that's not a problem.
Looking for comments from the experts as to whether I'm in the right ballpark, or what you'd change. It seems like there are no longer any off the shelf cams like this (reverse or equal split).
This is for a street-only car that's stock internals with catback exhaust. Want a cam that produces a great low-end torque curve to 5K rpm. Don't care about over 5K (but don't want it to fall off a cliff), not concerned about getting max peak HP, prefer a flatter curve. Also want a stock idle. I do my own tuning so that's not a problem.
Looking for comments from the experts as to whether I'm in the right ballpark, or what you'd change. It seems like there are no longer any off the shelf cams like this (reverse or equal split).
11-24-2014, 05:02 PM
#2
I suspect a reverse split is the opposite of what you want on a car with restrictive exhaust
Geoff (former Thunder Racing, current EPS) used to use a lot of reverse splits such as the TR230 and even he seems to have swayed away from them, I think you're in the ballpark but I would go normal split or no split
Geoff (former Thunder Racing, current EPS) used to use a lot of reverse splits such as the TR230 and even he seems to have swayed away from them, I think you're in the ballpark but I would go normal split or no split
11-24-2014, 05:14 PM
#4
I suspect a reverse split is the opposite of what you want on a car with restrictive exhaust
Geoff (former Thunder Racing, current EPS) used to use a lot of reverse splits such as the TR230 and even he seems to have swayed away from them, I think you're in the ballpark but I would go normal split or no split
Geoff (former Thunder Racing, current EPS) used to use a lot of reverse splits such as the TR230 and even he seems to have swayed away from them, I think you're in the ballpark but I would go normal split or no split
11-24-2014, 08:00 PM
#5
A reverse split might not be good for a stock manifold car when looking at overall power, but when trying to maximize torque under 5k that's actually not bad.
The main thing he would really gain by extending the exhaust duration is power up top. By keeping the exhaust duration short and thus delaying the EVO he's getting the most torque under the curve as possible at the expense of high rpm power.
The main thing he would really gain by extending the exhaust duration is power up top. By keeping the exhaust duration short and thus delaying the EVO he's getting the most torque under the curve as possible at the expense of high rpm power.
11-25-2014, 08:39 AM
#7
Well let me put it this way...
I had a Comp 230/224 XE copy of the TR230 in my car. It went flat and I called Geoff and told him I wanted something slightly more powerful but keep manners.
He sent me a 230/238 with about .020" more lift. I swapped on some 799s with mild intake runner porting, no exhaust porting. The very first thing I noticed when driving the car after was the snappy off idle gains under the flash point of my converter. This combo makes more power everywhere over the old cam.
OP wants a stock power curve with more torque and stock idle. IMO he should get some 243/799s and mill them ~.030" and keep the stock cam. A friend did that with excellent results.
I had a Comp 230/224 XE copy of the TR230 in my car. It went flat and I called Geoff and told him I wanted something slightly more powerful but keep manners.
He sent me a 230/238 with about .020" more lift. I swapped on some 799s with mild intake runner porting, no exhaust porting. The very first thing I noticed when driving the car after was the snappy off idle gains under the flash point of my converter. This combo makes more power everywhere over the old cam.
OP wants a stock power curve with more torque and stock idle. IMO he should get some 243/799s and mill them ~.030" and keep the stock cam. A friend did that with excellent results.
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11-25-2014, 10:29 AM
#9
If you want low end power and don't care much above 5k rpms I would suggest something more like a 214/218 .595/.598 on a 110° LSA using LXL lobes. It will have the same overlap as a 224R cam on a 114 lsa but offer much larger gains in torque through the low end and midrange.
Lonnie
Lonnie
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Last edited by Sales3@Texas-Speed; 11-25-2014 at 03:00 PM.
11-25-2014, 11:26 AM
#10
Well let me put it this way...
I had a Comp 230/224 XE copy of the TR230 in my car. It went flat and I called Geoff and told him I wanted something slightly more powerful but keep manners.
He sent me a 230/238 with about .020" more lift. I swapped on some 799s with mild intake runner porting, no exhaust porting. The very first thing I noticed when driving the car after was the snappy off idle gains under the flash point of my converter. This combo makes more power everywhere over the old cam.
OP wants a stock power curve with more torque and stock idle. IMO he should get some 243/799s and mill them ~.030" and keep the stock cam. A friend did that with excellent results.
I had a Comp 230/224 XE copy of the TR230 in my car. It went flat and I called Geoff and told him I wanted something slightly more powerful but keep manners.
He sent me a 230/238 with about .020" more lift. I swapped on some 799s with mild intake runner porting, no exhaust porting. The very first thing I noticed when driving the car after was the snappy off idle gains under the flash point of my converter. This combo makes more power everywhere over the old cam.
OP wants a stock power curve with more torque and stock idle. IMO he should get some 243/799s and mill them ~.030" and keep the stock cam. A friend did that with excellent results.
Previously was running 853/241s with a bigger cam, this was a night and day difference.
11-25-2014, 12:25 PM
#11
If you want low end power and don't car much above 5k rpms I would suggest something more like a 214/218 .595/.598 on a 110° LSA using LXL lobes. It will have the same overlap as a 224R cam on a 114 lsa but offer much larger gains in torque through the low end and midrange.
Lonnie
Lonnie
11-25-2014, 02:22 PM
#13
TECH Fanatic
BTR stage 3 truck cam 218/224 .553/.553 113+3 . It's designed to make ton's of low end and mid range torque, should ible good with -5* overlap, and it's lobes are so soft you can use LS6 springs and stock pushrods.
11-25-2014, 02:55 PM
#14
The cam that I specced would have a very mild chop to it and could easily be driven in a daily driver with great street manners given a tune. It would still work with a stock stall converter too if you have an automatic.
Lonnie
Lonnie
__________________
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POWERBOND - ASP - PRECISION INDUSTRIES - YANK - CIRCLE D - AND MORE!
COMP - FAST - PACESETTER - WISECO PISTONS - LUNATI - CALLIES - NEW TSP BRAND CRANK & RODS - COMETIC GASKETS
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Last edited by Sales3@Texas-Speed; 11-25-2014 at 03:13 PM.
11-26-2014, 03:59 AM
#15
With stock exhaust manifolds or shorty headers:
214/224 113lsa+4, it'll have a slight cam sound, but run very smooth with -7* overlap. I'd use Cam Motion lobes and tell them you want to keep the lift (@.05") under .600", or if you used Comp Cam lobes use the Xtreme RPM (high lift) lobes which would be lobe #3710 (214*) with .559" lift, and #3715 (224*) with .568". The IVC on the cam will also be 36*.
214/224 113lsa+4, it'll have a slight cam sound, but run very smooth with -7* overlap. I'd use Cam Motion lobes and tell them you want to keep the lift (@.05") under .600", or if you used Comp Cam lobes use the Xtreme RPM (high lift) lobes which would be lobe #3710 (214*) with .559" lift, and #3715 (224*) with .568". The IVC on the cam will also be 36*.
11-26-2014, 06:17 AM
#16
TECH Veteran
https://ls1tech.com/forums/dynamometer-results-comparisons/1213394-baby-eps-cam-lays-down-430rwhp-415rwtq-track-results.html
Best baby cam that's proven yet in my book....
Best baby cam that's proven yet in my book....
11-27-2014, 12:23 AM
#17
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To the OP I wanted similar results to what you want in a cam and chose a 595/598 210/214 114.
Didn't really achieve anything worth writing about. I think you will be disappointed if you don't go a bigger cam and hi stall etc and forget about the good idle.
Otherwise as others mentioned just do the heads with more compression. That would be my next mod if a lifter goes and gives me reason to.
Didn't really achieve anything worth writing about. I think you will be disappointed if you don't go a bigger cam and hi stall etc and forget about the good idle.
Otherwise as others mentioned just do the heads with more compression. That would be my next mod if a lifter goes and gives me reason to.
11-27-2014, 01:49 PM
#19
Like this: 214/224 112lsa+3, with a 36* IVC and -5* OL.
11-28-2014, 11:43 AM
#20
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