Build Opinions

[Morgz32]

hey guys, just wanting peoples opinions on this quick motor build im going to put together before august, use it for a while whilst im prepping a built 30 bottom end

it consisits of:

- standard RB25DET

- top mount turbo manifold

-40mm external gate with 1.1bar spring

- GT30/GT35R turbo

- Forward facing plenum

- Atleast 770cc injectors

-Bosch 044 fuel pump

-Oil cooler kit

- 52mm alloy radiaitor

- Z32 airflow meter

tuning wise thinking i may get away with a nistune with the help of a SAFC??

Later down the track ill smash in 260 deg cams or may have enough saved to put them in when i add the above extras but was thinking if im running only 15 psi of boost standard cams shoild be alright??

(please correct of im wrong)

whatta we think?

Edited April 14, 2010 by Morgz32

[inthisglass]

will be pretty laggy with the standard 25 and a GT35

[R32 Driver]

get a Gt35 with the .63 rear then update the rear to a 1.06 later down the track when you put in the 30 bottom end

works well on a standard 25 and definately not to laggy

[snozzle]

sounds like you have some cash to blow, i do not recommend you run a nistune if your planning to run a top mount setup, run an ecu that uses a map sensor as the inlet is something like 4" and an afm such as the z32 will be a restriction, it may even cause the car to stall/run like shit due to air reversion back toward the afm

get a pfc dj or something along that standard

if your running a standard motor, and 400hp will keep you happy, your probably going to like the response that the gt3076 has to offer as you will not be able to use the full potential of a gt35 on a standard motor

a pair of poncams will open up that midrange also giving the car alot more of an aggressive power delivery

my 2c, goodluck with the build

[Morgz32]

yea i got abit saved up and continuing to do that until end of july i was thinking about the de jetro but again funds may be an issue... i wanna maintain a top mount set up with external gate.. the only hick up im having is a turbo choice... i heard/ thought 35R's are pretty responsive thats why i was going to go for it

with cams again see how much i got by the end of july and hopefully can scab enough up to buy cams as well 260 deg shuld help in the response department

[Morgz32]

and snozzle like your saying with me not being able to use the full potential of the 35R forgot to mention that im using the 25 head on my 30 bottom end so i kinda wanna set it up so i can put the head and block together and then back into the car... should still be able to have fun with a 35R though??

[snozzle]

ohh your post said standard 25 though haha, well in that case, id also go for the gt35 on a 30 bottom end, have some 400kw+ of fun and traction issues......

i really do hope you dont run a nistune on a setup like this though!

Edited April 14, 2010 by snozzle

[Morgz32]

ohh your post said standard 25 though haha, well in that case, id also go for the gt35 on a 30 bottom end, have some 400kw+ of fun and traction issues......

i really do hope you dont run a nistune on a setup like this though!

Yea sorry about that aha completely forgot to mention that im putting the head on a 30...

well.... no....im not looking into power fc, haltech or motech only problem is finding one.. any ideas? tuning shops should stock them or be able to get them

[bubba]

What's wrong with running Nistune on a setup like that?

Nistune will be perfectly fine and there is no need to run an SAFC too as the Nistune is fully programmable so there's no need for an interceptor aswell.

[Morgz32]

i see i see hmm i guess its probably best i call a tuning place like allstar or hyperdrive to see what they reckon...

so whatta we think of the setup in regards to turbo choice? will she be to laggy or pretty responsive with the aid of new cams?

[snozzle]

ive always known top mounts with such big intakes to be restricted by air flow meters, that is the basis of my reasoning

also, reversion can cause the afm to almost stall the car once u come off boost and back to idle (approaching traffic lights) if the intake pipe is relatively short which in most cases is

who knows, nistune will probably do you just fine, a friend of mine is making 400 with a nistune (not a top mount) and he is having no issues at all but in my eyes, a gt35 is a completely different setup as to a 'highflow'

[d1_drifter]

Wouldn't relocating the AFM to the intercooler piping allow for the 4" intake and the use of the Nistune board?

[snozzle]

ive seen that done before but not sure how it would affect drive-ability

[ossie_21]

GT30 ftw, but 35 with a smaller housing would be tempting too

Edited April 15, 2010 by ossie_21

[R32 Driver]

if your going to the extent of top mounting it

get a MAP sensor based ecu, afms look gay on top mount setups

and if you think afms gonna restrict flow, get a greddy dual intake kit, smash 2 on then

[snozzle]

i didnt know u could do that with an ecu thats only meant to run 1 afm? interesting how is it done?

[Kaido_RR]

ive seen that done before but not sure how it would affect drive-ability

does not affect drive-ability; i have move mine and didn't touch the tune and the car runs fine

[Morgz32]

+1 how is it done? i thought you couldnt use an ecu such as a d jetro... i read a post saying that 25's dont use map sensors??

[bubba]

With an R32 you can use a GTR loom and ECU (daughterboards are the same) and then run 2x RB25 or even 2x Z32 afm's if you need to make that much power.

OR, there are other big single afm's out there (Ford Lightning is one I was recently put onto).

Personally, I prefer an airflow meter setup as it actually measures how much air is going into your engine and anyone tuning for a MAP setup should really be using an airflow meter to set up the maps otherwise it's just calculation and guess work.

I'd also prefer to have a system with ACTIVE KNOCK SENSING, no aftermarket ECU out there can do it that I've seen. Sure, PFC can display your knock levels on the hand controller and flash the engine check light at you, but Nistune will actually revert to different maps just like the stock ECU does when it detects knock.

[bubba]

also, reversion can cause the afm to almost stall the car once u come off boost and back to idle (approaching traffic lights) if the intake pipe is relatively short which in most cases is

Either the bov is in the wrong place or it can't flow enough.