cams

[C - ROD]

i heard that a mild cam upgrade for the SR20det would be a set of de cams in it, supposedly they have a diiferent duration & lift tahn the det camsi don't know & that is why i am asking

[HardcorePS13]

FWD SR20DE's from the early years have a slightly better intake cam. Not worth going out and swapping IMO.

[C - ROD]

well im speaking of the ones from rwd sr20de

[HardcorePS13]

well im speaking of the ones from rwd sr20de

Too much hassle when you can get better aftermarkets for cheap.

[C - ROD]

this i know but i was just wanting to know

[HardcorePS13]

this i know but i was just wanting to know

You stand to gain midrange on a stock turbo but thats about it. Flow is limited by the turbocharger.

[VitaminT]

I am not sure about stock na cams, but usually aftermarket cams have more overlap than turbo cams and can hurt spool times ect. Granted the lift and duration might be slightly more, overlap isn't really spec'ed out.

[HardcorePS13]

I am not sure about stock na cams, but usually aftermarket cams have more overlap than turbo cams and can hurt spool times ect. Granted the lift and duration might be slightly more, overlap isn't really spec'ed out.

I'm sure HKS, JWT, and a number of other manufacturers are aware of overlap. Besides, my point to him was that you don't stand to gain much with a camshaft upgrade on an engine with a tapped out turbo.

[spider_slayer]

I'm sure HKS, JWT, and a number of other manufacturers are aware of overlap. Besides, my point to him was that you don't stand to gain much with a camshaft upgrade on an engine with a tapped out turbo.

yea, and if your only running stock boost you won't "lose" power but you aare sacrificing a good amount of lowend for a minimal amount of highend.

[drifter_for_life06]

HKS step ones from 240sxmotoring is a good deal

out of curiosity, why ddi you post that picture?

[HardcorePS13]

yea, and if your only running stock boost you won't "lose" power but you aare sacrificing a good amount of lowend for a minimal amount of highend.

If you are running stock boost you will notice a considerable amount of top end.

This is because the engine's volumetric efficiency is increased with the camshafts, the turbo now has to flow more air to provide the same boost pressure.

He would gain 20whp if he were running stock boost.

[C - ROD]

i posted the picture just for the hell of it

[codyace]

Get a set of JWT S3 cams. No losses anywhere on the powerband, only gains (especially in the midrange with these).

Great for NA and for DET applications.

[spider_slayer]

He would gain 20whp if he were running stock boost.

no.

like i said, you will gain SOME top end but NOT 20whp. if you don't believe me then get your self some step s 272/272's and dyno then prove me wrong.

its really not worth losing your lowend.

this has been discussed many times by the way. hey look i found this by searching zerothread?id=55568

[HardcorePS13]

no.

like i said, you will gain SOME top end but NOT 20whp. if you don't believe me then get your self some step s 272/272's and dyno then prove me wrong.

its really not worth losing your lowend.

this has been discussed many times by the way. hey look i found this by searching zerothread?id=55568

Incorrect.

Here's why.

The turbocharger in the situation I listed (stock boost) is not limited in it's flow capacity yet it's boost pressure is regulated to 7 - 8 PSI. When you increase engine VE you will by definition increase the amount of air that is consumed in a single cycle. Now apply that to pressurization principles and you will get a corresponding drop in pressure due to the drop in volume in a confined space (intake manifold). Now you are running a few PSI less boost pressure, and what does the turbo do in that instance? The wastegate remains closed and the compressor flows more air to elevate the pressure. So you see it is like running higher boost pressure on a lesser VE engine.

Now when the turbocharger is tapped out in terms of airflow (ie. 14 PSI - stock cams) then you will see less of a gain since the amount of airflow to the engine is being regulated. In an N/A application this would be similar to having a restrictive intake manifold for your cam choice.

[spider_slayer]

ok, i understand what you are trying to say. and that link was probally a bad example because it refers to running 12-14psi. but you are still not going to gain 20whp with upgraded cams. the stock cams are matched to the stock boost to provide the best balance of lowend and top end. even if you do gain that 20whp you lose a good amount of low end power.

besides why spend upwards of 400 on cams when for around 150 you can buy a boost controller and a fuel pump and run full boost and stand to gain ~30rwhp.

[HardcorePS13]

ok, i understand what you are trying to say. and that link was probally a bad example because it refers to running 12-14psi. but you are still not going to gain 20whp with upgraded cams. the stock cams are matched to the stock boost to provide the best balance of lowend and top end. even if you do gain that 20whp you lose a good amount of low end power.

You will gain a good amount more power than you think as I've stated and elaborated on above.

The loss in low end power depends solely on the profile of the camshaft, many camshaft choices do not have a large disparity in low end power as well. You can also get adjustable cam gears which can alter the valve openings to provide greater low end to midrange torque if it is that big of an issue.

besides why spend upwards of 400 on cams when for around 150 you can buy a boost controller and a fuel pump and run full boost and stand to gain ~30rwhp.

I'm not telling him to go out and buy camshafts. Read my posts.