Another Cam question 402ci
Another Cam question 402ci Finally I was able to stuff my 402 in my TA however I am dissapointed with my cam advice from Lunati. I told the sales person "I want good low end driveability."
Evidently he did not listen and sold me a 231/237 .595/.598 with 115LSA.
I started it up and it loped too much at idle so I am sure low end would SUCK.
I took it out and sent it back!
I have seen alot of advice on the web for stock 5.7 cube engines but for the 402 (6.6) not much available.
I am thinking of having it Reground with 224/228 with .581/.588 with 115 LSA.
But with the higher LSA, this will also cut down on accel response?
Or the 224/224 .56 + - with 112LSA, but is 224 too small duration for a 402ci?
I know this will poop out on top end but I do not drive on top end. I want to keep near stock driveability .
Like alot of people say, Torque moves a car ?
Any suggestions?
2000 TA 6 spd stock 3.42 posi
6 Liter P&P heads W/ Comp 26918 springs Maybe FAST 90mm intake ?
With a smaller cam, would the FAST 90mm still make some muscle in midrange?
Dynamaxx headers
Eagle 4"crank and rods with Diamond Pistons.
Underdirve pulley.
Naturally K-N and SLP lid 85mm MAF
I read JRP's cam guide and it helped but thought someone with experience might have some info.
Thanks for any info,
Evidently he did not listen and sold me a 231/237 .595/.598 with 115LSA.
I started it up and it loped too much at idle so I am sure low end would SUCK.
I took it out and sent it back!
I have seen alot of advice on the web for stock 5.7 cube engines but for the 402 (6.6) not much available.
I am thinking of having it Reground with 224/228 with .581/.588 with 115 LSA.
But with the higher LSA, this will also cut down on accel response?
Or the 224/224 .56 + - with 112LSA, but is 224 too small duration for a 402ci?
I know this will poop out on top end but I do not drive on top end. I want to keep near stock driveability .
Like alot of people say, Torque moves a car ?
Any suggestions?
2000 TA 6 spd stock 3.42 posi
6 Liter P&P heads W/ Comp 26918 springs Maybe FAST 90mm intake ?
With a smaller cam, would the FAST 90mm still make some muscle in midrange?
Dynamaxx headers
Eagle 4"crank and rods with Diamond Pistons.
Underdirve pulley.
Naturally K-N and SLP lid 85mm MAF
I read JRP's cam guide and it helped but thought someone with experience might have some info.
Thanks for any info,
Teching In
Joined: Mar 2004
Posts: 43
Likes: 0
From: New Orleans LA
How long did you drive the car before removing the cam. I just had a 224 with LSA of 112 in my A4 TA by TR. When I first started the car at thunder I was a little dissappointed with all the rumble, to be honest I didn't want all that. After three weeks of driving and getting ust to the Sy3500 and the 224 together, I love the combo. That is alot of motor you have there so I think the 224 would be a little small. But I am no expert. I promise you after a little time of driving, you would have gotten use to that cam. Hope this helps.
Yes, torque moves cars, if the torque is up in the RPM range. Making 500lbs-ft at 2k rpm is of little use. Driving around town you want some low end grunt, but you don't want so much that you can burnout by blowing on the gas pedal.
I had an L98 for a few years, and those engines made a ton of low end torque. Think LS1, just lower in the RPM range. It was an A4 and off idle you could roast the tires with 2.73s and no effort. What made it a horrible engine was the fact that it felt fast, but really wasn't due to the torque. By 4000 RPMs it was choking out and it wasn't pulling like it could have been. If you put a 224 cam in the 402, you'll have the same problem. You'll have to remember that the 402 will make more low end torque than the stock engine everywhere, but that engine needs to breath to do anything above 4500 RPMs.
I don't know what you want to do, but if this is going into a 3500 P/U, then you might get what you want. And don't get caught up in the torque ends all statement. What makes cars really fast is producing torque at high RPMs. If the engine can provide twisting force once you are already moving to make the tires spin faster, then you accelerate. The initial torque moves you, but you need to maintain that rotational force as the engine spins faster to move the car faster. HP is simply torque x RPM. That's why the L98 didn't make any HP and weren't fast. 345lbs-ft and only 245HP? It got off the line, but it didn't pull once it was going.
Personally, I'd go with a 244/244 cam AT LEAST. 248/254 would be even better.
I had an L98 for a few years, and those engines made a ton of low end torque. Think LS1, just lower in the RPM range. It was an A4 and off idle you could roast the tires with 2.73s and no effort. What made it a horrible engine was the fact that it felt fast, but really wasn't due to the torque. By 4000 RPMs it was choking out and it wasn't pulling like it could have been. If you put a 224 cam in the 402, you'll have the same problem. You'll have to remember that the 402 will make more low end torque than the stock engine everywhere, but that engine needs to breath to do anything above 4500 RPMs.
I don't know what you want to do, but if this is going into a 3500 P/U, then you might get what you want. And don't get caught up in the torque ends all statement. What makes cars really fast is producing torque at high RPMs. If the engine can provide twisting force once you are already moving to make the tires spin faster, then you accelerate. The initial torque moves you, but you need to maintain that rotational force as the engine spins faster to move the car faster. HP is simply torque x RPM. That's why the L98 didn't make any HP and weren't fast. 345lbs-ft and only 245HP? It got off the line, but it didn't pull once it was going.
Personally, I'd go with a 244/244 cam AT LEAST. 248/254 would be even better.
Slowhawk,
What was the LSA on that cam? If that 232/238 idles like stock, evidently my tune is LUNAR ?
However it did not seem off by far.
Zleeper, what ci do you run?
What was the LSA on that cam? If that 232/238 idles like stock, evidently my tune is LUNAR ?
However it did not seem off by far.
Zleeper, what ci do you run?
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TECH Enthusiast
Joined: Sep 2003
Posts: 730
Likes: 66
There is no way that cam is bad on the low end. If it was properly tuned you could still put in gears for the best low end response. The 224/228 115lsa is good to high 6000's but is silly to have gone with big cubes and not put a cam in it.