b18c engine rebuild Turbo charge....

[brownes]

hi i was wondering what cams i should use??? thinking of stage 1 jun cams with all the rest as in valv spring and those ect..... but the question is would N/a cams work on a turbo charge engine.....

[barefootbonzai]

yeah no reason y it wouldn't work, but thing is, if your car is turbo charged you're probably better of spending money else were to get better gains, like pistons and rods to run more boost.

And y did you choose jun cams? Cause it sounded cool?

[brownes]

oh dw i m doign tat i m just wondering about the cams lol i m getting low compress piston and stuff lol :D

[Waggy]

And y did you choose jun cams? Cause it sounded cool?

Lol Duy...

Consider a set of turbo spec cams too man, might be more useful, but it depends on your application. I think James' BLKCRX actually used Toda Spec C cams from memory (which are a high spec N/A cam).... so in the end it really depends on your tuner. :)

Like BBonzai said though, you're better off buying strengthened rods and pistons first up to get your setup happening, then buy all the upgrade stuff later.

[STOCK]

Toda spec Cs

[Muzz]

i m getting low compress piston and stuff lol :D

How low are you going & what are you power goals?

[yourfather]

crower make turbo cams for your B18C

[JasonGilholme]

no real point going to lower comp pistons if you only want to run low boost.

I'm pretty sure theres some honda's round with standard compression and strengthed rods with about 14 ish PSI.

Decomping will loose you a fair whack of power unless you up the boost to fill the gap. :thumbsup:

[Sexc86]

mate.... all cams will "work" just depends on what you want outa your setup.... you can build the BIGGEST & Best N/a Engine around (High comp pistons, os valves high valve overlap cams) and then add 1psi too it and it will perform better.... now do this with 10psi and so on etc... (generally speaking)

[yourfather]

yeh but ur forgetting that overlap caused by VTEC cams will be a negative influence on a psi fed app.

[Muzz]

mate.... all cams will "work" just depends on what you want outa your setup.... you can build the BIGGEST & Best N/a Engine around (High comp pistons, os valves high valve overlap cams) and then add 1psi too it and it will perform better.... now do this with 10psi and so on etc... (generally speaking)



While all cams will work, these a big performance difference between a N/A cam and a turbo cam. Just because a N/a cam will increase power on a n/a engine, and then adding boost will raise the power on top of that, dosnt mean go out and buy any good aftermarket cam, that analogy shows absoloutly nothing and is simplifying it alot. Theres many benifits to a properly selected cam for the application, ie turbo.

If you decide to get cams, might aswell find some turbo cams, instead of paying the same amount for a cam designed for a N/A application. Get the best performing option for your money imo, not somthing that "works" because it increases the power on a n.a engine, and boost further increases on that power.

[HondaLva]

yeh but ur forgetting that overlap caused by VTEC cams will be a negative influence on a psi fed app.

Thats not all correct. Ill give you an example.

My turbo integra was on the dyno and we couldnt get the VTEC to work with the microtech. It just wouldnt switch to high cam. So for interest sake we ramped the car to 6000rpm w/ no Vtec the car made 176hp at the from wheels.

Now when we figured out that the AUX1 on the Mtechs send a neg pulse as apose to a positive one (which is how vtec is triggered) and got vtec working she pulled all the way to 7800rpm and made 220hp.

This is with standard cams. No cam gears.

almost a 50hp difference just with vtec.

[HondaLva]

While all cams will work, these a big performance difference between a N/A cam and a turbo cam. Just because a N/a cam will increase power on a n/a engine, and then adding boost will raise the power on top of that, dosnt mean go out and buy any good aftermarket cam, that analogy shows absoloutly nothing and is simplifying it alot. Theres many benifits to a properly selected cam for the application, ie turbo.

If you decide to get cams, might aswell find some turbo cams, instead of paying the same amount for a cam designed for a N/A application. Get the best performing option for your money imo, not somthing that "works" because it increases the power on a n.a engine, and boost further increases on that power.

Yep i agree.

But the advantage with honda unlike nissan and toyota is that VTEC acts like a high lift camshaft.

Ill give you a EG.

A standard sr20 cam has a set lift and duration right. so in order to increase that ie allowing more air in and more exhaust out, you need to change the camshaft. Which means a lumpy idle a loud car and cranky neighbours. You get what i mean anyway.

The schweet thing with hondas is that VTEC directly alters the lift and duration. Thus, replicating the action of changing your camshafts in your nissan etc Plus if your one of those lucky ppl to have a K series engine your even luckier. The cars ECU has the ability to electronically ctrl the cam angle of the intake cam. Given the ability to change cam over lap etc at any rpm

Obviously aftermarket cams are gonna make a difference but i would rock the standard ones.

My 2 cents

Pat

[yourfather]

thats not what I said, what I said is, that at a certain point, with the overlap, you will get blowby, maybe I was not clear enough.

If you make the best possible N/A motor you can and add 2 psi of boost it will perform BETTER - but the idea is to get as much stuff into the motor as possible.

[Muzz]

Yep i agree.

But the advantage with honda unlike nissan and toyota is that VTEC acts like a high lift camshaft.

Ill give you a EG.

A standard sr20 cam has a set lift and duration right. so in order to increase that ie allowing more air in and more exhaust out, you need to change the camshaft. Which means a lumpy idle a loud car and cranky neighbours. You get what i mean anyway.

The schweet thing with hondas is that VTEC directly alters the lift and duration. Thus, replicating the action of changing your camshafts in your nissan etc Plus if your one of those lucky ppl to have a K series engine your even luckier. The cars ECU has the ability to electronically ctrl the cam angle of the intake cam. Given the ability to change cam over lap etc at any rpm

Obviously aftermarket cams are gonna make a difference but i would rock the standard ones.

My 2 cents

Pat

Hey bud, i think you might of misinterpreted what i was saying.

Vtec is great, and if you got it and are going turbo on a street car, then keep it, its a huge advantage to have two different cam profiles that swap at a point in the rpm range.

What im saying is reguarding aftermarket cams, if your gunna upgrade cams on a turbo engine, youd be silly to get a cams designed for a N/A application (even though you will see gains), when you could get cams designed for forced induction.

The turbo cams still have the two profiles (makes use of the vtec system), just like aftermarket N/A cams, but both profiles are designed for forced induction.

Im not talking about de-activating the vtec and only running on the low lift lobe, nor am i talking about vtec killer turbo camshafts which gets rid of the vtec.

The majority of aftermarket cams still make use of the vtec system, but the lift and duration on both hi and low lobes are altered from stock.:thumbsup:

[superR]

hi i was wondering what cams i should use??? thinking of stage 1 jun cams with all the rest as in valv spring and those ect..... but the question is would N/a cams work on a turbo charge engine.....

I just recently finished my turbo type R engine build. At first i decied to go with the stock ITR camshaft which made 195kw at the wheels @ 8 psi , Then i decided to put a set of toda cams in, and on the same boost the car made 235kw.....30kw difference , no word of a lie. Cant wait to see what it does on high boost!
I wont say which of the TODA spec cams i used, but i will say that it is important to match your camshaft selection to your turbo size.
What size turbo are you going to be using?
what will be in your bottom end?

[AusS2000]

Not conclusive. VTEC isn't just overlap. It's additional lift too.

The point he is making is that the things you do to cams to increase NA performance won't necessarily benefit FI.

In your example the car NA might benefit from more overlap, but FI it wouldn't.

The point is, if you're going to spend your hard earned on cams and you're FI, buy ones made for FI.

[HYPERTUNE]

I just recently finished my turbo type R engine build. At first i decied to go with the stock ITR camshaft which made 195kw at the wheels @ 8 psi , Then i decided to put a set of toda cams in, and on the same boost the car made 235kw.....30kw difference , no word of a lie. Cant wait to see what it does on high boost!
I wont say which of the TODA spec cams i used, but i will say that it is important to match your camshaft selection to your turbo size.
What size turbo are you going to be using?
what will be in your bottom end?

:thumbsup:

As stated above, your turbo will govern what cams are most suitable for you. If your turbo is big enough, and you have low exhaust pressure, NA cams can work very well. I use Toda Spec-C in my B16A, but remember there is no point putting cams in that give a power band up to 11k unless you have an engine built to take it....