Camshafts

[Zas)-(]

Hey every1

just asking wether i need any other upgrades if installing tomei camshafts in... the ones from just jap?

im kinda juggling between them or other mods,

how much gains would u get from them, i have a r33 series 1, large blitz fmic, 3.5 cat back, custom cai, custom manifold and soon customs front.dump pipes.....running on 12.psi

is it possible to just get the camshafts without altering the springs or valves???????

and how much would it cost for the install roughly

thanks guys

[sinistaGTR]

you got a ecu, get a power fc

[LOOF]

you got a ecu, get a power fc

I agree you need to get that, I had a few mods done but when I got the PFC I got over 30rwkw when it got installed.

[sinistaGTR]

yeh i rated mine highly lol other than the big turbo setup now lol, pfc is prob one of the best things you can get

[Zas)-(]

dunno i just thought the mods u keep adding u keep gotta tuning her then.... afta the camshafts if deh can be placed in get a powerfc she shud pull hard evenon 12 psi? just for stocker turbo????

[sinistaGTR]

your car would run like crap the stock computer couldnt compensate for them, theres heaps more mods to do before you get cams to make good power. try power fc, fuel pump, injectors, z32 afm, turbo.......

[700HP-GTR33]

Hey,

Cams are good, especially poncams which do not need heavier spring, valves, or having an aftermarket computer in.The Poncams are designed to bolt on and drive off...not even cam gears are needed.0 adjustment works the best for them.

If this is the only modification you are planning in the next year or so ...do it because you will get great results.

Hope I have been of some help..

Cheers

These cams are around $800 for the set and installation should be around $400.

Your power output will increase slightly, but your response and power curve will be alot better.

[Roy]

700HP-GTR33...great to see you posting and getting involved in the forum...but

If this is the only modification you are planning in the next year or so ...do it because you will get great results.

You wont get any real gain if your still running the std turbo...and anything that changes the breathing of the engine as dramatically as cams means you need to tweak the fuel and ignition maps of the engine as well.

Look at the results of Bass Junky, cams proved to be a wast of money with std turbo, he even had management which was tweaked to try and get a gain with the cams. If you do a search i think you will find that ppl are yet to get any gains from cams on std turbo. On an R33 the best thing is an exhaust cam gear....a thread by benm and his old R33 comes to mind. The quikest std turbo / ECU R33 i have ever been in so exhaust cam gear gets my vote for a lot less money

[Beer Baron]

on a standard R33 GTST (that is standard ECU and turbo) you will not get any real gain from just bolting in a set of poncams. the stage you are at now, your stock cams are best. maybe consider an adjustable pulley for the exhaust cam. you should be able to get some gain there.

[rev210]

The fuel and ignition maps need a rework, so you need a power FC or something similar. They do not work like standard in the low rpm and idle area in terms of mixture.

Gaskets/seals for the top where the cams live.

You will also need a set of new retaining studs as the old ones may break either down the track of when re-torquing them.

You would do well to obtain cam gears at the same time as mentioned too.

What tomei cams do you plan to buy and why?

Edited October 29, 2006 by rev210

[rev210]

I did the exhaust cam upgrade (HKS grind) only on an old gtst I had and it worked quite well even with only a S-afc II on a factory turbo. It resulted in a fat mid range, with a power FC and more tuning it would have produced even more.

[sinistaGTR]

yes, the increase that can be received by putting cams in, can be resulted by a computer and tune alone. i mean a computer is an upgrade that has to be done along the way and most ppl see it as one of the last mods you do to your car. i mean this guy hasnt even got a fuel pump so putting cams in shouldnt be on his prioritys right now.

[Munna1]

Roy is correct.

ECU or piggyback should be your next upgrade I just had an exhaust cam gear installed on my car while it was getting its 100k service. Gained 5rwkw which the tuner said they usually get with the stock turbo.

Only cost me $90 a good mod to do when your getting this service done. Look the groupbuy section of you want to get one

cheers

[NickR33]

there is a small gain to be had on a stock turbo RB25...

I have made 208rwkw with SAFC, EBC, exhaust (stock dump) and FMIC at 10psi WITH Tomei 256 degree poncams...

even taking into account a 'happy dyno' there is an argument that they will give you some kw's at the top end and help it make power all the way to redline and not taper off at 6,000

dyno chart is attached, you be the judge but I think they are great

BTW they are set at 0 degrees and work with the stock springs and VVt

[Munna1]

Thats very interesting Nick do you have a before graph for comparison.

[NickR33]

no I don't... tuner forgot to run it up beforehand as I had asked

there are definately better bang for buck mods but I wouldn't totally reject the idea of poncams on a stock turbo rb25...

[rev210]

A mild set of cams allow the same power to be produced earlier in the rev range, with less boost required to achieve it.

[sinistaGTR]

notice nick has a safc but even that allows some slight tunage...... not a dead stock ecu without any sort of piggy back device.

[Roy]

A mild set of cams allow the same power to be produced earlier in the rev range, with less boost required to achieve it.

But if you are planning on sticking with the std turbo....i would be very interested to see an engine that actually has more mid out of it. Does anyon ehave graphs of before and after?

Even with NickR33s results...im not convinced. The std turbo isnt that big for a 2.5L and i doubt they can provide the airflow to really need cams to help fill the lungs.

If NickR33 picked up some grunt...i woudl then ask did he have the SAFC tuned before the cams were installed?

Not being argumentative, just curious to see if we can rule out some other things

[NickR33]

look I can't give a before and after so I am would be lying if I said I have any concrete proof... however I do seem to make the power at relatively low boost as rev210 would suggest

I had the SAFC in and tuned before the cams so no help there and I cannot be sure I picked up ANY power... however the last dyno tune before the cams was also pre FMIC and it made 170rwkws's... the cams and FMIC were added and SAFC tuned again (to pull even more fuel out) and I got 208rwkw... different dynos, different days

I just wish the tuner had done the before graph as I had wished

BTW the cams were always planned to go along with a turbo upgrade, was just curious to see what would happen if I did it the other way around