Rb25Det Exhaust Question!?

[ccruzn]

dw im not a wanker on the road

i had an s14 before this with 235rwkw 864nm and got raappppeeeddddddd on red p's..... i want this one to be as subtle as possible and im not gonna go for huge power..... might go up to a 2860 or 2871 with bigger cams and injectors when i get off p's hopefully get around the 250rwkw mark safely

[ARTZ]

Don't need cams for that just a hiflow...

[ccruzn]

if i can get more safely with that size turbo then awesome cause i dont want too much lag.....

and i like the sound with cams

[AngryRB]

if i can get more safely with that size turbo then awesome cause i dont want too much lag.....

and i like the sound with cams

you know, alot of the cam sound is from the tune, with mild cams its almost undetectable, but with the mixtures changed at idle you can get the fat cam sound or even without cams get the sound.

[ccruzn]

thats interesting! does it affect power or fuel safety of the engine?

[AngryRB]

thats interesting! does it affect power or fuel safety of the engine?

i dont think so, its just the mixture on idle, obviously you need an aftermarket computer for that

with mine, as soon as the mixture was leaned a touch it would give the rough cam idle, but i prefer it with a smooth idle and odd lump to it.

[ARTZ]

Cams are not needed in Rb25s unless your pushing for big numbers the stock cams are good to 350kw sometimes more...

[AngryRB]

Mark with your cams and turbo you should be making a bucket load more power than you are...why have it if your not going to use it.. most blokes with a basic hiflow setup would give you a run for your money any day...cams are not really needed in Rb25s unless your pushing for big numbers the stock cams are good to 350kw sometimes more...

yeah well with a forged engine im sure the gtx would make upto 380rwkw, i think if you run a gt30 or larger a set of cams doesnt hurt, it makes 320kw on 16psi which is nice and safe, i dont want to be doing a rebuild anytime soon, and yes they'd give me a run for my money cause they'd have more traction for sure, maybe in third id hose them off

[GTSBoy]

Yeah. Far better to spend the money on something worthwhile, like better turbo, better manifold, WMI injection system. Almost anything else really.

[ARTZ]

Or in Marks case a better clutch...lol..is that 320kw on e85??

You don't need a forged engine either....just a tuner willing to push the envelope.

[AngryRB]

You don't need a forged engine either....just a tuner willing to push the envelope.

haha , you go first then.. ill watch from outside the dyno room incase a pistons decides to depart ...lol

[ARTZ]

haha , you go first then.. ill watch from outside the dyno room incase a pistons decides to depart ...lol

my turbo (actually my whole setup) isn't big enough, its pretty much close to maxed out as is....

but thats why i chose it cause it suits my power target...all i'm saying is why have it if you dont need it or not going to utilize it..

I'm not knocking your setup its killer, im just saying i want to see you turn the volume up..

It could be good for 400kw or you miay as well have got a smaller turbo

[AngryRB]

my turbo (actually my whole setup) isn't big enough, its pretty much close to maxed out as is....

but thats why i chose it cause it suits my power target...all i'm saying is why have it if you dont need it or not going to utilize it..

I'm not knocking your setup its killer, im just saying i want to see you turn the volume up..

It could be good for 400kw or you miay as well have got a smaller turbo

yeah your 100% right, if i were doing it again id of just gone gt3076 maybe with a 0.63 rear even with E85 and hoped to max out at 300ish

went gtx cause it sounded like a good thing, 10%more flow etc but its actually suited for a forged motor really, but also down the track i would like to attempt a rb30/25 or maybe just a forged rb25 , so then the boost will be wound up to 25psi.. i like to have alot of room for more power down the track and really its not bad, 20psi at 4000rpm shes on par.

[ARTZ]

we pushed mine to 21psi but nothing exciting happened...extra 10kws or something...have you tuned past 16psi at all, and is that on e85 ??

[AngryRB]

we pushed mine to 21psi but nothing exciting happened...extra 10kws or something...have you tuned past 16psi at all, and is that on e85 ??

no havnt gone past 16psi at redline and yeah E85, it was responding very well to boost and timing advance, each psi was like 10kw or more and knock levels very low, the fuel makes massive difference went from 280 to 320kw with no more boost needed.

[battery]

no havnt gone past 16psi at redline and yeah E85, it was responding very well to boost and timing advance, each psi was like 10kw or more and knock levels very low, the fuel makes massive difference went from 280 to 320kw with no more boost needed.

So did the tuner decide 320kw was the safe limit or did something else hold you back?

[AngryRB]

So did the tuner decide 320kw was the safe limit or did something else hold you back?

well i asked him what he thought was a good safe limit and he said 1.4bar is what he'd take it upto on E85, i was only looking for 300kw so when it hit 320kw first run i thought, wow i think ill leave it there in case somthing goes pop... it must of cost about 5k atleast upto that point and dont wanna spend more if anything goes wrong..

Quite alot of people say running over 300kw's is a gamble so i didnt want to push it incase it went bang, and i love how it sounds and drives as it is..

sorry daniel , dont mean to take over your thread..

Edited January 5, 2013 by AngryRBGTX

[battery]

I love how it sounds and drives as it is..

Mission accomplished then!! Still would be cool to just do a few dyno runs at 20+ psi to see what its fully capable of.

[ARTZ]

Mission accomplished then!! Still would be cool to just do a few dyno runs at 20+ psi to see what its fully capable of.

+1 ....and I'm intrigued to know why tuner didnt try it...if it was responding so well why give up on it....we all know an RB can push further, even if you just did it for tuning then cut it back....it also gives you a safety margin should you hit any overboosting issues down the track..I'd say 300 is a gamble but you're pretty safe on the dyno, its the varying conditions it sees in everyday life that would cause issues...

you could be restricted by that vegan clutch though....should of gone carbotic...

[AngryRB]

+1 and I'm intrigued to know why tuner didnt try it....if it was responding so well why give up on it....we all know an RB can push further, even if you just did it for tuning then cut it back....it also gives you a safety margin should you hit any overboosting issues down the track..

im intrigued now too.. lol well it was with a 250kw rated clutch, ive no doubt it would of seen atleast 350kw, if you watch the dyno video you can see it backs off after 5000rpm so it had heaps left, i will eventually build a bottem end up and go back for 350kw plus its still a goal...