R34 Gtt Stock Ecu Performance

[shrike]

Hey all

I have a r34 rb25det neo in my r32 running the stock loom and ecu its taken alot of headaches to get the car running as well as it currently is

now I have a list of mods and think what will limit me is the stock ecu

Engine has

3" exhaust

Dsr430 turbo

greddy style ffp with 80mm throttlebody

Fmic 2.5" hot and 3" cold piping

top feel fuel rail with neo injectors

tomei fpr

550hp fuel pump

dsr coil packs

topmount stainless manifold

port and poilished head

50mm tial bov

41mm tial wastegate (9psi)

gfb boost controller

pod filter with cai

Im currently running the afm in blow threw set up

Now from memory the stock ecu has a boost cut at 15psi?

Im going to run her upto 13-14psi this weekend after I sort the oil return leak and get my oil gauges on

any idea on what rwkw Ill get and how safe it will be (note I will take it on the dyno to check afrs etc as well)

thanks

[Hanaldo]

First of all the TP cut differs from car to car, mine was cutting at 11psi whereas others I have seen can run 11,12,13 before they hit it. Secondly, you realize that 13-14psi through a larger turbo is NOT the same as 13-14 psi through the stock turbo right? The engine reads mass air flow, not restriction. You will be running rich as all hell, and if you hit TP cut (which I'm sure you will) then it will feel like you're hitting a wall every time you come on boost.

It will always surprise me how many people want to leave the ECU to the last thing they mod, when really it should be done first. Get an ECU. Get a proper tune.

[GTSBoy]

Well, it's not just the boost cut and the TP limit that you have to worry about. The top right hand corner of the fuel and timing maps are massively rich and massively retarded. You will make no power if you go up there. And if you try to run it up to 13-14 psi on a big turbo, you will certainly go there.

Do not waste your time trying to run it hard unless you either Nistune the ECU or get something else.

edit** beaten by Hanaldo by >< that much

Edited September 21, 2011 by GTSBoy

[Hanaldo]

edit** beaten by Hanaldo by >< that much

[KiwiRS4T]

Do not attempt to drive it with the stock ecu. You will need a Nistune chip or other custom made tuned in the car chip or better still bite the bullet and get a Link.You will probably max out the afm so you will need a Z32 afm (unless you get the Link).And change your wastegate setup to be nearer to your target boost. Stock injectors may limit your power.

[The Mafia]

Dude I would consider getting the nistune. It's about $200 and allows you to fully program the factory ecu, which is almost always the best ecu for any car.

Find a good tuner and get it done. You'll be laughing all the way then.

[R31Nismoid]

Car stands no chance of driving, let alone making any power on a dyno.

Not surprised you've had issues getting it running with that part list either.

Unless you have a tuneable ECU, forget even taking it for a dyno as it'll just be a waste of cash.