camshaft question

[homermartinez1]

well i have a ca18det and i am looking to buy some cams from tomei. If I am planning on going 264 in. and 272ex. would i have to do anything else to my valvetrain in order to use those cams... Thanks for the help and my setup just in case you are wondering is stock ca18det block t3 garret turbo and 440 cc injectors...waiting for z32maf,and the cams if they will work

[themadscientist]

http://www.tomei-p.co.jp/_2003....htmlTomei doesn't make a 272, they have a 270. If you get the lower lift hydraulic cams they are a drop in but I would put stiffer springs in there and make sure my lifters were working silky smooth. The RPM range where those would make power is pretty high.

[homermartinez1]

so if i were to get the 260's would it also change my rpm capability...im thinking of going 260 in and 270 ex what do you think?

[themadscientist]

First a few questions.

how much power do you want?what will the car be used for?how mechanicaly inclined are you?budget?

The longer duration cams will move your power peak higher yes.

[homermartinez1]

i would like at least 270 horsepower street/track carwork at axiom motorsports this is pretty much a guiny pig motor and budget....PLATINUM plastic

[themadscientist]

Leave the motor alone, a bone stock CA18DET can do that with a bigger turbo, injectors, fuel pump, may need a larger MAF and a ROM rewrite.This assumes the motor is in excellent condition which likely your will not be. Save the money and spend it on a complete rebuild with new stock parts, replace the rod bolts and head bolts and if you want a 1.2mm metal head gasket. You could go with head studs if you want but they are not a requirement, same for aftermarket rods. 300 or less the stock bits will be fine. You need more air and more fuel in the proper amounts is all.

[boost_boy]

Yeah, you don't need to go playing with camshafts to get the kind of power you're after. And when you start mixing-up camshaft durations, be ready to add the adjustable pullies and the needed tuning to boot. Like the the mad one says, a stock CA18DET is more internally adequate enough to get you where you want to be.

Dee

[good morning]

What does your exhaust manifold look like? If it is log or inefficient design, stick with stock cams. If you have a nice piece, bigger cams will make good power over stock.

[homermartinez1]

well the reason i wanna get cam also is to help the big a** turbo spool up quicker and a higher redline

[good morning]

well the reason i wanna get cam also is to help the big a** turbo spool up quicker and a higher redline

I understand.

But think about it this way. If you are breathing into a straw. If breath smooth, and small amounts. It will not have restrictions. But if you tried to breath heavy, you will notice that you have to use a lot pressure. Same thing with a log manifold (or other restrictive manifold). Larger cams normally have more over lap. This is why all that restriction is bad. It will not "bleed" off all the wasted gases. This is another reason why "they are good to xxxwhp" does not apply.

With a good manifold and good cams, you will spool faster and make more power.

[themadscientist]

well the reason i wanna get cam also is to help the big a** turbo spool up quicker and a higher redline

If you want to spool a rediculously huge turbo you should get a bigger engine. My T04E spools almost as fast as my S14 turbo did and will do well over 300hp. Totally stock engine with cast iron divided manifold but my exhuast housing isn't a twin scroll. I think your money would be better spent on a well-designed manifold. It is a waste for us to keep telling you this though as you obviously just want big cams no matter who disagrees so stop asking rhetorical questions and go buy some 280 degree 11mm lift cams and enjoy the completely unrealistic and undrivable engine behavior. When you have nothing until 6000 rpms and keep getting smoked by guys with less cams then you you will understand why people are trying to dissuade you from the course you seem hellbent on pursuing.

Ok I have seen this car in person and I know the guy who built it.After you are done creaming your jeans over it taka a close look at the dyno.http://www.sdsefi.com/features/apr06nissan.htmHe has jack squat until well over 5000 rpms and then it takes off like a jet. Looks cool on a graph but try driving that every day.Here is another example. Again watch the power curvehttp://www.sdsefi.com/features/jan064ag.htmI have seen this car in anger and it is impressive. He always carried an extra transmission in the back just in case. The car behaved like a moody pitbull though and was basically an on/off switch.

If you had said "I am shooting for over 400hp full tilt strip car" I would say "get the big sticks" but you did'nt. Keep it real, you will be happier in the end.

[boost_boy]

If you want to spool a rediculously huge turbo you should get a bigger engine. My T04E spools almost as fast as my S14 turbo did and will do well over 300hp. Totally stock engine with cast iron divided manifold but my exhuast housing isn't a twin scroll. I think your money would be better spent on a well-designed manifold. It is a waste for us to keep telling you this though as you obviously just want big cams no matter who disagrees so stop asking rhetorical questions and go buy some 280 degree 11mm lift cams and enjoy the completely unrealistic and undrivable engine behavior. When you have nothing until 6000 rpms and keep getting smoked by guys with less cams then you you will understand why people are trying to dissuade you from the course you seem hellbent on pursuing.

Ok I have seen this car in person and I know the guy who built it.After you are done creaming your jeans over it taka a close look at the dyno.http://www.sdsefi.com/features/apr06nissan.htmHe has jack squat until well over 5000 rpms and then it takes off like a jet. Looks cool on a graph but try driving that every day.Here is another example. Again watch the power curvehttp://www.sdsefi.com/features/jan064ag.htmI have seen this car in anger and it is impressive. He always carried an extra transmission in the back just in case. The car behaved like a moody pitbull though and was basically an on/off switch.

If you had said "I am shooting for over 400hp full tilt strip car" I would say "get the big sticks" but you did'nt. Keep it real, you will be happier in the end.

Say no more, brotha'! We're moving on to other topics and good luck to the original thread starter.

Dee