Gt28rs tubs 60Ar and one bar aquators.three inch dp and three inch test pipes.fmic.how much reliable power. What 500 bhp.with a noel map.,?

Oh and some injectors as well.lol

Are we talking flywheel or wheel hp?

Wheel.

Then I think pistons and rods would be advisable too, and a fair few other supporting mods :yes:

Then I think pistons and rods would be advisable too, and a fair few other supporting mods :yes:

 

Why do say that?

Rods & crank are forged from the factory. The stock pistons are cast, but still strong and can cope with 600+

Why do say that?

 

Because from all the information I have been reading lately in prep for my own build it would seem to be advisable to upgrade rods and pistons for RELIABLE hp gain as requested in the op here, granted the stock rods and pistons are of good quality for stock parts, but how many miles have they covered already? And all of a sudden the power has been jumped up considerably and you expect it to last any reasonable length of time? granted the stock setup probably can make that power, but can it do it as RELIABLY? and I didn't suggest replacing crank. in my opinion it's a waste of time and money to push a worn engine beyond its comfort zone. Spend a bit more money for long term peace of mind and happiness. :yes:

I don't think anyone would suggest that worn parts are reused in any rebuild. If a part is worn then obviously replace it, and then you

have the choice of fitting stock or aftermarket. It all depends on your own goals, but if the engine is sound (within specs) then isn't it

nice to know that you don't need to "over spec" given that the stock engine is already "over spec'd" from the factory for quite sizeable

increases in reliable power with the correct tuning?

Surely with supporting mods like cams, new biggest pistons and uprated pipework etc, you going to get better power and nicer delivery??

 

Very interested in what you all think on this thread as want to build my swb to reach the 500-600 mark

Who said anything about a tired or worn old engine. Also in there ti make sure things are nice and tight. Forgot to say it will have new cam belt and new shells and bearings to make sure.peace of mind.

I think he was meaning that our cars are ageing a bit now. Personally, I think I'd rather upgrade the rods and and pistons too. Which I did

If I was rebuilding my engine I'd rather buy uprated parts. Buying oem pistons and rods will no doubt be the same or even more expensive to buy. It makes sense to buy forged for future proofing the engine.

.....granted the stock setup probably can make that power, but can it do it as RELIABLY?

 

In short, YES.

 

You don't have to replace the pistons with forged items. You definitely don't have to replace the rods, they are already forged. With a healthy engine, forged items are a choice and not a requirement at that power level in a road car. A track car would benefit from forged pistons to better withstand the in-cylinder heat & pressure for prolonged periods. Lighter aftermarket rods have benefits in such a scenario too.

and I didn't suggest replacing crank. in my opinion it's a waste of time and money to push a worn engine beyond its comfort zone

 

It was just info regarding the crank, as you mentioned replacing both pistons & rods as if they are requied

 

In my experience, it is not a waste of time or money, it is precisely the opposite. 550ish bhp @ fly does not need updated internals for reliable operation. So you can save yourself both of the above. Considerations obviously become different if you require OEM levels of longevity (100k miles), and at that point, even Nissan offer an OEM alternative, namely the VR38DETT.

I guess it all comes down to personal choice at the end of the day, as my post said noel I think rods and pistons are ADVISIBLE not a REQUIREMENT, it cannot be argued by anyone that if pushing an engine to make that hp output that it cannot be a benefit to fit forged internals, I will change my internals for up rated parts because it will give better long term results.

Yes, everything comes down to personal choice, but that doesn't mean it is the correct advice for the OP.

Yes, everything comes down to personal choice, but that doesn't mean it is the correct advice for the OP.

 

So let me get this correct, are u saying that to make a vg30dett produce around 600 RELIABLE hp,it's NOT ADVISABLE to replace rods and pistons with better quality forged parts? if I built an engine to produce that power RELIABLY without replacing some internals I would guarantee it to the shutter of my workshop and no further! :lol:

Would you also push it outside? Lol

Would you also push it outside? Lol

 

:yes:

So let me get this correct, are u saying that to make a vg30dett produce around 600 RELIABLE hp,it's NOT ADVISABLE to replace rods and pistons with better quality forged parts? if I built an engine to produce that power RELIABLY without replacing some internals I would guarantee it to the shutter of my workshop and no further! :lol:

 

I am keeping within the topic of this thread, it was not a question regarding a high-spec engine build, so why are you talking about guarantees? Aftermarket rods are lighter therefore advisable for higher RPM requirements, which in turn necessitates uprated valve train components. Has OP mentioned this anywhere? Having tuned many high performance VG30DETTs, I know that aftermarket rods are not required for twin GT28RS turbochargers. There isn't any other way I can explain this to you.

I am keeping within the topic of this thread, it was not a question regarding a high-spec engine build, so why are you talking about guarantees? Aftermarket rods are lighter therefore advisable for higher RPM requirements, which in turn necessitates uprated valve train components. Has OP mentioned this anywhere? Having tuned many high performance VG30DETTs, I know that aftermarket rods are not required for twin GT28RS turbochargers. There isn't any other way I can explain this to you.

 

I stand by my advice whether it's taken or not as it is only advice at the end of the day, and I believe the majority of people would agree with it.

 

A wise man is one that accepts he doesn't know everything there is to know :yes:

Indeed, but tuning VGs is something I do know about. Hence why I am commenting on this and not a thread about bodywork for example.

A wise man is one that accepts he doesn't know everything there is to know :yes:

 

That can work both ways! May I ask what is your experience is in VG30DETT engine building?

To be honest. I have no experience in building an engine and I'm not sure what noel or Chris have, but id prefer to upgrade the stuff if you're rebuilding. Its certainly in the past been the thing to do... Whether rightly or wrongly

When rebuilding, either by choice or necessity, it is a no-brainer to use aftermarket parts when looking to increase power to 550+bhp. That is a given. But this thread is not about that. No one is rebuilding anything here :laugh: