Best Option To Reach Reliable 450-500 HP

[tokes]

Buddy of mine runs 1000CC injectors in his Talon with an AEM with absolutely zero issues with idle/startup/cruising.

Sure, maybe 15 years ago when we didn't have the same kind of advanced ECU's that we do today it might not be the best idea to go with huge injectors, but I don't see any problems with them.

[timo]

well im at 500hp now and here are a list of my mods , with a RB26 its not that difficult to get to 500 , i mean really and truly ur not gonna be using all 500hp everday so what i did was tuned the car at the boost to get to 500hp safely and then turned down boost for the street to about 400.so here is my list

twin hks 2530's
stainless steel manifolds - dnt know what brand
hks dump pipes
hks front pipe - 70mmx2 into 80mm
sard 660cc injectors
z32 afm's
hks step 1 cams - 272in/272ex 8.7mm lift
nismo fuel pump and fpr
apexi power fc
apexi boost controller
new but stock size headgasket

and got to 500hp with pump gas
and we all know u can get there without the cams , so its really not that difficult well once u

[mcfly]

Eagle rods are like N1 oil pumps?

n1 oil pumps are still stock with only an upgraded spring.

take it past stock limits and it breaks....well then you will be wishing you had listened.

[PH_Motorsports]

well im at 500hp now and here are a list of my mods , with a RB26 its not that difficult to get to 500 , i mean really and truly ur not gonna be using all 500hp everday so what i did was tuned the car at the boost to get to 500hp safely and then turned down boost for the street to about 400.so here is my list

twin hks 2530's
stainless steel manifolds - dnt know what brand
hks dump pipes
hks front pipe - 70mmx2 into 80mm
sard 660cc injectors
z32 afm's
hks step 1 cams - 272in/272ex 8.7mm lift
nismo fuel pump and fpr
apexi power fc
apexi boost controller
new but stock size headgasket

and got to 500hp with pump gas
and we all know u can get there without the cams , so its really not that difficult well once u

timo, what year is your car ? orginal rb26 in there ? no upgraded oil/water pump ? That looks like a very affordable build, just my motors already got 160,000km on it .......

[paradox]

One thing to remember also is that reliable depends a lot on what you will be doing with it.

I'd say half the people in this thread are thinking 500 road-racing-reliable hp and the other are thinking 500 street-cruising/drag-racing-4-times-a-year-reliable hp.

Not the same build at all.

[PH_Motorsports]

http://www.horsepowerinabox.com/hpiab2/prod430.htm

what do you think /.?

[tokes]

lol, 6600 dollars plus shipping for a stock motor with forged pistons, wow, what a ripoff. I'm doing my build with forged pistons, forged rods, rebuilt head, ATI balancer, jun oil pump, new water pump/timing belt/pullies, and machining for about 5000.

[seper]

1000 cc injectors = same price as 600's for me, so why not go larger. The nismo/tomei fuel pumps are also way more than I paid for the bosch 044, so bigger can't hurt.

injectors work best at 90% duty cycle

[tokes]

That's a load of ****. So why aren't factory cars put out there with injectors hitting 90% duty cycle? They're an injector, they work best at any duty cycle under 100%

[PH_Motorsports]

Well I looked into complete enignes from :
Rips in NZ , specializes in RB30s
mine-wave.com & Tomei - Both have updated there english websites. Though it would be nice to get one of these brand new crate motors. I looking for a more affordable route. Who has had there enigne built in the GTA? And what shop did you use ?
THanks

[Danno]

That's a load of ****. So why aren't factory cars put out there with injectors hitting 90% duty cycle? They're an injector, they work best at any duty cycle under 100%

Actually, that's a load of ****. Injectors are really only reliable under 80-85% duty cycle due to the lag time required in opening and closing the injector. If injectors are static (100% IDC), you can't accurately manage the fuel flow and rely on fuel pressure.

There's a reason a stock 280PS GTR has 444cc injectors.

[mcfly]

Actually, that's a load of ****. Injectors are really only reliable under 80-85% duty cycle due to the lag time required in opening and closing the injector. If injectors are static (100% IDC), you can't accurately manage the fuel flow and rely on fuel pressure.

There's a reason a stock 280PS GTR has 444cc injectors.

so you can turn up the boost

[tokes]

Actually, that's a load of ****. Injectors are really only reliable under 80-85% duty cycle due to the lag time required in opening and closing the injector. If injectors are static (100% IDC), you can't accurately manage the fuel flow and rely on fuel pressure.

There's a reason a stock 280PS GTR has 444cc injectors.

How can you say injectors are only reliable at 80-85% DC, when a very tiny portion of time spent driving is actually at full throttle? So you're saying production cars that normally hover around 10-30% DC for part throttle street driving where they spend most of their time are going to have fueling issues because of their injectors being TOO big? To say injectors work BEST at a certain duty cycle is just a load of crap. True, you don't want to be running static, but I've been in a GN where under full boost they're creeping up to 95% duty cycle and it's managed to not blow up after a bunch of years. Lots of people strech out injectors to the max, and as long as they're not static and you can get it to idle, there aren't any problems.

Inectors aren't turbos where they have an efficiency island where they operate best :hit_head:

[Danno]

How can you say injectors are only reliable at 80-85% DC, when a very tiny portion of time spent driving is actually at full throttle? So you're saying production cars that normally hover around 10-30% DC for part throttle street driving where they spend most of their time are going to have fueling issues because of their injectors being TOO big? To say injectors work BEST at a certain duty cycle is just a load of crap. True, you don't want to be running static, but I've been in a GN where under full boost they're creeping up to 95% duty cycle and it's managed to not blow up after a bunch of years. Lots of people strech out injectors to the max, and as long as they're not static and you can get it to idle, there aren't any problems.

Inectors aren't turbos where they have an efficiency island where they operate best :hit_head:

You're not reading what I said. Go back and read what I said.

I didn't say you can't run a 100% IDC, but it's not a good idea. Holding injectors static will shorten the life of them, and fuel delivery becomes non linear because it's now relying strictly on fuel pressure instead of pulse width. This can lead to leaning out the engine.

80-85% is an industry standard for max safe duty cycle. You can argue all you want, but this is a fact.

[Danno]

Lookn4aGTR,

I think you need to figure out (or make note of) what you want the car to ultimately be able to do.

Paradox made a good point. Not all 500hp RB26s are the same. Small twin turbos would be better for the street, a great big single would be better for drag, for example.

If I were you, I'd build up the engine I have. Others (possibly even you) would rather just buy a pre-assembled crate engine and swap it in.

Start doing some searching of old threads on here, specifically in the GTR Projects section to get more familiar with what some of us are doing to get those numbers. Another good resource is Sean Morris' page http://tyndago.googlepages.com/gt-rmildupgrades

Also, don't believe everything you read on the internet. There's a lot of mis information and opinions even in this thread.