What To Do

[RPR33]

Hey Guys

I am stuck at the moment my car getting about 280-300kms out of each tank its making ok power (175kw)but is runnin very rich. The guy who dyno'd it just said its been tuned for more boost so I can use the fuel of a high tuned car and have the power or use the fuel and not have the power.. but I'm not so sure he's right! he has a pretty bad history with powerfull cars that don't live to long how much boost can a stock skyline handle with front mount and 3 inch turbo back system ?

The car may have different internals but I'll play it safe as far as i no the turbo has a steel front wheel. maybe the plastic one fell off??? (series 2 r33) haha

it also had a heap of wiring pulled out of it once it landed in australia. what other things can make it run rich?

The car feels great to drive and doesnt show any signs of problems!

[SECURITY]

it all comes down to how he tuned it.

noone is going to sit here and say 'run 12psi' then have your motor blow because your car is tuned for 7psi (example).

that questions can only be answered by your tuner. he sounds shit so i'd be taking it somewhere else and get them to do it all for you.

[mad082]

well the front wheel of the turbo isn't the problem, its the ceramic exhaust wheel that all rb25's have the problem with. if it has a steel wheel and is a series 2 (unless it is a 95 model, which makes it a 1.5) then there is the chance it has been highflowed, or just replaced with a series 1 from a wreckers.

as for the car running rich, that is how they are from the factory. and your fuel economy is about right. when you say to a tank, how many litres do you mean, beacuse some people fill up at the empty line, others fill up at 1/8th of a tank to go and still say they got X amount of k's to a tank.

[RPR33]

na I mean fuel light comes on i fill it to the brim and 280-300kms later the lights on again the car was tuned in japan by ksp tuning I can't get info off them it could have been done 10 years ago. So i'm just tryin to match the ecu and am not sure if I should just hammer in the boost, I don't drive the car very hard I have friends with skylines making 240kw that use less fuel? but do have better ecu's and mods...

Boost wise whats "safe"....? will the turbo be the weekest point? or engine??

[mad082]

on the stock turbo, the turbo is the weak point. anything above about 12psi and you start getting into the danger zone. you could get a safc2. this will lean the car out (giving you more power) and give you much better fuel economy.

[RPR33]

with my air/fuel haeding into 10:1 do you think I should just go new turbo for more air???? I can get my hands on a to4 but I'm not to sure if I want it I think it will be real laggy and I don't want nothing till 5000rpms.

I only want around the 220-250rwkw wat turbo will give me this without to much lag??

Cheers!

[R31Nismoid]

A t04 will give you more lag than a drunk grannie.

old school turbo from what, 20-30 years ago.

If your AFR's are that low, you need an S-AFC or a PowerFC or similar management to properly control it all

[BHDave]

If your cruise mixtures are all rich then possibly look at getting a stock ecu fitted or even a new 02 sensor.

If the car is tuned properly it should not run rich everywhere. The idea that you have more fuel in than needed at a specific load point because it is tuned for more boost is ridiculous, as when you add more boost the ecu will be looking up a different point in the map (which i suspect will also be a bit on the rich side).

[mad082]

i get about that sort of k's out of a tank. checked my afr's yesterday. about 14.5-15 on cruise, and WOT 12 up to about 5000rpm, then drops down to about 11.4 up top.

i'd go for a safc or pfc and get it tuned.