tm_r33

so yer about 350kw at the treads then is the limit then by that logic i spose.

agreed. i like johnny walker as a drink but every time the add drops down i just want to throw laptop then blow my head off

+1 gtx35r t4 flange .82 rear

+1 for 9:1 static comp. I have just had my engine built with 9.2 aries pistons but the nice big mls head gasket brought it back to pretty much 9:1. Isnt half the reason for switching to 3 litre to gain some down low driveability??? I know obviously the extra exhaust gas brings on early spool and you have the increased torque as displacment grows to name other benefits buts whats the point in adding extra displacement and then lowering the compression. One gives u low rpm drivability and the other hinders it. nothing wrong with the 9:1 cr that rb25 have to start with. Especially for a car with regular street duties. My 2c

Let me know what numbers u make when its tuned. Ive also got to consider my other parts thats all. Ifa rod lets go it will no doubt f**k one of my pistons. Maybe destroy my modified block and even send the piston flying into my nice new valve train.

What sort of engine troubles u having mate?

yer engine is now complete and on engine stand in my garage with engine mounts, alternator, powersteering pump, rocker covers, thermostat housing, cas and all that shit bolted on. would be costly both time wise and to my wallet to now change rods. im thinking 350 at the treads at 7000 rpm will be safe. only just but im thinking safe. surely some one on here has a 25/30det rids standard rods at over 300 kw??

yes but now that the engine is complete and back home after costing me 9 grand at the engine workshop, if i decide to throw forged rods at it i have to get it back to the shop, and get them to pull the sump off, pull rods and pistons out. press gudgeon pins out, press pistons onto new rods and assemble again. but they prob wont get a ring compressor in past the crank shaft so yer it is pretty much paying for assembly once again yes??

was about to ask this. surely putting the block through the hot tank would wash any old bearing material out? or would sum of the oil galleries be farely hard to clean out? but then again when u pull a block out of the hot tank you blast the shit out of all the galleries with the compressor so surely that would quiet easily blast out any shit the tank missed

i can chuck up some photos idler/tensioner on my 25/30 if that will help. lol timing covers look shit when u twin cam the 30 block. and yer i had to cut mine in 2 spots and probably need to take sum more out to gett better belt to cover clearance

lol yer thats why im not goin on what the phisical size of them is compared to others. rb rods have a farely decent journal size next to plenty or other rods and im not 100% sure on there metal make up but from memory they are pressure cast which is slightly better than standard pour cast. but yer as i said really id just like to know if some one has been abusing a set with decent power for any length of time??

i read the early threads pertaining to the v8 rods next to the rb rods ages ago but just wondering if anyone has a real lifeexample of standard rb30 rods holding in their engine for a decent period of time with about 350 kw at the treads

is that on 30 bottom end or 25? i wouldnt hesitate to put this power through 25 rods as they is so short but with the extra length in the 30 rod it means there is more chance of deviation in the rod shaft. (obviously as something gets longer it has more chance of bending in the middle). This wouldnt be a problem if the 30 rods were thicker than the 25 rods but they arnt lol.

Hoping to make this power on about 18 ~ 20 psi from gt35 not that this should mean anything. Rods where inspected and crack tested befor assembly. My engine shop thought they would be fine but my tuner is telling me hes a bit concerned. Thoughts

Hey all about to drop my 25/30det in and having second thoughts on rods. Im running acl bearings and all bolts have been changed to arp studs. Running 9:1 forged pistons and crank and rods and pistons all got ballanced but now im thinking I should of replaced pretty much the only part I didnt. The rods. Will stock rods that are balanced to each forged piston with arp studs and acl bearings survive 350 rwkw ? ? Crank has also been dynamicly balnced with flywheel and balancer to try keep things running smoothly and im hoping to set limiter no higher than 7000 ~ 7500 rpm. Thanks james.

hey all. selling a pair of factory rb25 camshafts out of 33 gtst will 80 xxx km's perfect condition. out of a stock car that is now a 3 litre with track duties so these were pulled out straight away. $100. buy me

i live in tassy and yes unless the administrators turned it around, ACL has been liquidating. strange thing is i just picked up my forged 30det with a set of acl big end and mains. i know the the guys at the shop that built my engine and they wouldnt be fibbing to me so i should ask them whos still supplying them with acl bearings. only thing i can think of is that many companys round australia had a heap in stock so its taking a while for them to disapear

I just picked my engine up from the builder and I am running 9.3 compression ratio. I used arias pistons. Obviously head gasket or decking will affect the comp ratio slightly. Im running 25 head on forged 3 litre bottom and obviously with decent cams and valve springs and appropriate head work. Ill be running a gt35 turbo and hope for about 400 rwkw to start with. Imho that will be plenty of power for a pure circuit car. Its a 33 gtst by the way. f**k peddling an 800 hp car around a track lol

Is there anything in particular u need to know right now? I'm sure you will find plenty of help on the forum. If you would like to change your display name just message some one on admin.

Lol ive got 235 40 on my 9.5 rear and 215 35 on 8.5 front.

No the car had the cam in it the whole time I owned it. Changing the exhaust around months after I bought it was where it lost power at lower rpm.

No but removing the standard cam shaft and putting the aftermarket cam shaft in did mean it had more valve overlap

Correct, on the dyno at the end of the rpm range there prob would be sfa in it. But in my experience its in the middle of the rev range it can cause a loss of power. And yes in my ute it was carby and more valve overlap. But had same effect in my 33 gtst. and about the 3 inch exhaust on a rb20det. Wouldnt the exhaust wheel on the turbo be a fare restriction? The turbo its self is creating some restricion anyway? Feel free to correct me on this if you have ur own feelings on this. Also obviously more exhaust gas too I spose due to the fact plenty of air is being forced into the engine. Lol hopefully I'm not just come across as provocative. I do think discusion is the best way for everyone to become more informed or knowledgeable

I can see where u comin from zebra. And yes in many aplications no restricion is need at all. Like u mentioned in drag s and another would be on boat outboars. They run perfectly fine with minimal exhaust systems. but I honestly think that the performance and sound do have some corrilation. I think that large exhaust on small na motors sound shit and once a certain size for a given motor is exceeded it looses performance as well as a nice note. I think the reason they start to sound shit is because of less back pressure. I only run 3.5 inch on rb30det

Front mount sold