What The*&%$&* Is Going On With My Car!

[Dean_HR31]

Hey guys,

Need some info/advice fast cos its doin my head in...

Basically have an R33 GTST which i bought with quickly:

- a rebuiilt/forged motor

- Microtech computer

- Ball Bearing Garret GT8-76R tbo

- Garret cooler

- 3.5inch exhaust no cats etc.

- Bosche 040 Fuel Pump

- Hi-flowed (By creatd motorsport) R33 injectors to 720cc

- Profec B Spec 2 Controller

Now basically its getting tuned at Creatd Motorsport in Campbelfied melbourne & the tuner advised me that this tbo would MAX at 240kws

at the wheels right. I didnt mind thats awsome power for the street.

Now problems are as follows:

a.) On the same tune that he has done he will do 3 power runs after each other without touchingg tune & the fuel map shows completely

different readings each time!!! eg, medium, Very rich, Rich, lean etc.

Now im guessing this could be a fault in the microtech? Sensors ETC have already been checked but seem fine!!

b.) The turbo seems to be f*king shithouse unless its the tune!!on 10 psi the car is making around 200kws & on 14psi is making around 217,

anything above 14 psi there is NO POINT OF, from 14-17 psi there was like a 4 kw increase!!?? WTF

Another thing related to this issue is whatever power it is making its is making it reallllyyyy lazily!! I thought since this tbo has a small

exhaust housing (apparently the same as a standard S14 SR20) the car would be respsonsive as F&^%& but... no!!! The dyno graph looks

shithouse!! It gradually makes its way up to whatever power whether it be on 10psi or 14psi and once it reaches its maximum goes str8

back down!!! Literally

What i want is something that makes power hard at once & holds this power through atleast 3 thousand RPM of rev range! Thats proper

power, the way mine is making it is a joke & useless.

Now on monday the tuner is going to put another Microtech in the car from another R33 and load the same tune into that computer and see if

the fuel graph keeps changing without touchng tune. If it doesnt change then we'll obviously know its a problem with my microtech, if it does

change we will then seriously scratch our heads!!!!

Anyone with high knowledge in relation to tune and or past experience please let me know whats going on, whether its the computer, whether i

should get someone else to tune the car, etc etc etc.

This is a picture of the exact turbo im running in my car which has the smaller 0.64 A/R exhaust housing.....

Edited May 12, 2007 by Dean_HR31

[phee]

I don't know much about Microtech's but could it be the injectors /coils or fuel pump? The spray pattern could be messed up?

[fEkuaR]

You would be better putting this thread in Forced Induction Performance. Will get alot more attention that way. It does sounds like a sensor issue though if they are checking up ok the computer could possibly be the culprit. Let us know how you go.

Edited May 12, 2007 by fEkuaR

[Risking]

Probably a "high Flow injector" issue.

Ive had it in the past with BIG high flows. They are not meant to be re-sized like that. You can get pintle harmonics and all sorts if issues with them.

If a new ECU does not solve it (id be throwing the microguess in the bin anyways) then try a set of injectors.

[Spunky Munky]

I am not after market ECU pro, but I have heard a few bad thing with Microtechs, apparently they don't go well with some mods.

I have an aftermarket Haltech EMS (Engine Management System) and it manages everything spot on.

I got my car tuned, modified and serviced at Nismo Australia in Sunshine VIC. He's done a good job, my car puts out around 245 k/w at the wheels so I guess something is being done right.

I would check the ECU, the fuel management configurations and definitely the turbo to see if it is running the appropriate boost PSI's at appropriate REv ranges.

Good luck mate.

I suggest you take it to the following places as well.

Dealer:C & D Motorworks

Dealer:Hi Torque PerformanceDealer:Speed Technology/EFI Hardware Location:190 Duke Street, North Sunshine 3020Location:15 Green Street, Doveton 3177Location:7 Monomeeth Drive, Mitcham 3132 Contact: Contact:DuaneContact:Steve Newing Phone:(03) 9312 7355Phone:(03) 9792 9984Phone:(03) 9873 5400Fax:(03) 9312 7366Fax:(03) 9792 9211Fax:(03) 9873 5955email: email:emailemail:email

Dealer:

Swift Automotive Pty Ltd

Dealer:

WBD Automotive Location:340 Frankston - Dandenong Road

Dandenong 3175Location:606 Kline Street, Ballarat 3350 Contact: Contact:Wayne Drew Phone:(03) 9706 6322Phone:(03) 5332 9233 Fax:(03) 9706 6344Fax:(03) 5333 3148 email: email:email

Edited May 12, 2007 by Spunky Munky

[Dean_HR31]

hmm thanks for the info guys... how about the turbo....? Can you guys inform me on any opinions/facts of this turbo running on an rb25?

Is it normal for it to lose puff that early on my motor, is my exhaust housing really too small as per what my tuner says?

ANDDD what could be causing the laziness down low????

Edited May 12, 2007 by Dean_HR31

[Tom Tucker]

Its not the microtech mate, its the turbo, its a notorious piece of shit. Even garrett doesn't recommend it for 'normal applications', its says so on their website

[Dean_HR31]

Thanks for the replies guys,

Basically i will go past the tuners shop tomoro again & take photos of all the graphs the car is reading and post it up!!

Then tell me what u guys think.. I will also let u know if it continues changing mixture with the other Microtech plugged in.....

[MBS206]

Take it to a proper authorised Microtech tuner.

Have fun though, last time I checked there wasn't many Microtech authorised tuners around.

Microtechs can be an absolute pain in the rear end to tune, so I HOPE your tuner knows what he's doing with it. That, and your injectors seem insanely big for high-flows.

[R31Nismoid]

we dont need dual threads...

http://www.skylinesaustralia.com/forums/in...p;#entry3114869