Best cams for SR??

[Devilish240]

Hello all,

I'm wondering if anyone here swapped there cams for more more agressive cams on their SR20DET? I'm hesitating alot between Greddy, HKS and JUN cams for the moment and I'd like some input on the subject. I'm looking for 272's with spring, retainers and valves (most likely Ferrea oversized valves). Anyone has done that or has opinions on the subject???

I got:-550cc injectors-Nissan 300zx MAF-Walbro fuel pump-Apex'i Dual N1 catback-Custom 3" downpipe (no cat)-Apex'i Intercooler-Forge Bypass valve-Apex'i turbo timer-Greddy Profec B Boost controller-Apex'i SAFC-Apex'i gauges (oil press, oil temp, boost and EGT)and upgrading head gasket and head studs at the same time.

Thanks for your help!!Dev.

[zion]

What good are the N1 Dual if you are not running a cat. There is going to be a big hole inbetween the dp and the catback. LOL. sorry had to do it.

[candela]

Unless you are really going to be upgrading to a large turbo the 272's (especially intake) will probably not give you anything and possibly decrease yoru torque output....

If you are staying on stock t25/t28 sized stuff then dont even bother its nto really worth it. Unless you go with 264's then you may gain a little throughout the power band...

[Hijacker]

since you don't have a new turbo, i'd be tempted to tell you 256's, but MovingViolation240 was running 264's on his with his GT25R and said he had a very smooth idle and usable powerband.

[Devilish240]

My plan is obviously to get rid of the T28 next year and change the injectors and manifold at the same time. I wanna go with a bigger turbo for sure... It's just a step that I wanted to make before because it's more affordable for me at the moment than a new turbo.

Anyone has tried 264+ on a bigger turbo?!BTW thanks for the input.. except for the hole in my exhaust line (ahhh that's why it's noisy! )

[Hijacker]

what i intend to do when i step up to a new turbo is port and polish the head, get a valve job done, new valve springs, externally wastegated turbo (looking into the GT25R because of high power and faster spooling). Of course, Injectors, MAF, and ECU are planned for that, so I've got some saving to do

[candela]

I had 272/272 combo on my DSM and loved the power I gained from it....however I had a big 56trim :p 264's are awesome for ANY car with mild mods and will usually give gains all throughout the rpm band. The 272's have more overlap and lope a bit more but my idle was ok. I still pulled good vacuum at idle, no surging and no dieing either.... However lots of peopel stick with a 264/272 combo because they like the smoother idle of the 264 and it still give great gains. I jsut went with the larger intake cam cause i was revving to about 8k and running 25+psi

[Devilish240]

Ok so if I was going to upgrade to a T3/T4 60-1 for example, 272/272 combo would be good?! I don't really care about idle.. it's my summer car that I take out once in a while to go to the race track.. not a daily driven car.. (and we have 4-5 months winter over here). With the spring, retainers and oversized valves I will be able to rev up to 8k easily...

Which cams would you consider most.. Jun, Greddy ou HKS.

[candela]

Absolutely :p That sounds like a very potent settup...

I have always liked HKS period, they are degreed ABSOLUTELY perfect from the factory, so you do NOT need gears unless you want to play with em. Anyhow a 60-1 is a nargly compressor and will make lots of power up top like that, srpings an retainers and a 8500 powerband aren't out of mind at all with some 272's. Just keep in mind that its quite a late spooler, capable of 500+whp either way so I would prolly considera small shot to help spool and shift response or a SMALL turbine housing (.63)....

Good luck man, sounds like you know what you want. Thats a very capable turbo! :ylsuper

[Devilish240]

Thanks very much for your input! It's the only site where I got a valuable answer (or an answer at all, as a matter of fact).

And i'm a girl see my cardomain for pics of my car and the complete setup... http://www.cardomain.com/id/devilish240

[candela]

well even if I saw you I still would call you "man"...its in my lingo man

PS- left you some feedback on your profile (noahrexion) :ylsuper

[Movingviolation240]

Even with the bigger turbo I'd suggest 264's unless you want to have an all out drag car.

I know a few guys running 400+rwhp on 264's and the car still starts up and idles on a cold morning.

On the other hand if you want to play with the engine management a little more to fine tune the 272's, and you want to make big HP (more than those 550cc injectors would suport) then the 272's would be the logical choice.

Unlike my last car, this project I tried to buy everything "not too big" I.E. a GT25R insted of my monster turbo on the CA, stock internals, and a mild cam. In the end the car is 400% more daily drivable, reliable, and fuel effecient, and it still has 95% of the speed the old car did.

that's my .02

PaulOrlando, FL

[Devilish240]

Thanks Paul! What brand of cams are you using on yours?

I don't want to make it an «only drag car» since I love AutoX. But the 550's will be gone for sure with the turbo and manifold next year, if not this year... I was looking into the Power FC if money comes along well this year...!

My goal: maximize hp figure with fine tuning and stock internals for the moment. 400hp-450hp is doable I think.....

[TurboB15Sentra]

Jim Wolf Technology has some of the best SR cams on the market. They spend a lot of time working on ramp angles, and harmonics.. etc.. to make sure that thier cams work great. For stock valvesprings, S4's with cam gears on a turbo motor are badass! If you want to spend the dough on springs too... C1's are great turbo cams.Travis

[Devilish240]

I research for JWT, but they seem to make them only for FWD SRs or KAs

Aren't S4 made for KA24DE?!? C1's are what brand and specs?!JWT again??

[candela]

Paul makes a relaly good point, but you gotta know that if you want the most out off your settup than those 272's will yield better results. The 60-1 aint no mess around turbo IMO. You know that you wont really be able to autocross well with all that lag from it. Full boost will be over 4k for sure with that turbo....If you are worried about idling (272's are fine IMO) then maybe just stick with the 264/272 combo like i mentioned earlier.

[Devilish240]

I know that my car won't be the perfect track setup nor the perfect drag setup. It's fine by me.. I don't do it to win anything... track time is "fun practice" time for me.. I only did it stock boost last year.. was too afraid of going full boost. This year I wanna try higher boost with the T28 and see how it goes... then I'll decide which turbo to go with.

[TurboB15Sentra]

I research for JWT, but they seem to make them only for FWD SRs or KAs

Aren't S4 made for KA24DE?!? C1's are what brand and specs?!JWT again??

There are S1, S2, S3 and S4 cams.. which are all meant to be streetable cams that work with factory valvesprings. S4's work realy well with N/A motors.. They work well with turbo motors when you use cam gears to take out the overlap. The S4's are 266* duration.. and 0.464" lift. They idle better than HKS 264's, and have a better designed ramp angle. This means that you have less chance of valve float, and better control over the dwell time/speed that the valve opens. This makes for a very smooth idle, and great powerband. It also makes it less harsh on the valve springs. The S3's are the most popular SR20 cam used in the states. The S3's are 260* and 0.442" lift. The idle is almost like stock.. but provide awesome gains in N/A and Turbo cars right out of the box. I would go with S4's and cam gears though. Any FWD SR cam will work in a RWD SR motor. it's the same engine. The only difference is that the exhaust cam sprocket has a gear on it to turn the CAS. You won't be dissappointed with those cams.. trust me.

The C series are JWT cams as well.. but require use of valvesprings and retainers. There are C1's C2's and C3's. These are meant for race engines, and have very lopey/high idle charachteristics. C1's you could probably get away with on the street.. but I don't think there's any need to use them over the S4's for what you're doing. Travis