GU 4500 TB45E Upgrade

I think I have finally cracked the extra Horsepower and Fuel economy problem with the TB45E motor.
I have had 3 Nissan patrols. 2 x ST 4500 and one 3.0 turbo diesel.
My first was a brand new 1999 ST4500 on LPG. I finally fitted a CAPA supercharger to get this truck going way back in 2000. (135HP on different Dyno)
My latest truck is also a 1998 ST 4500 on petrol but used only on weekends and for Holidays. ( had it for 5 years)
I wanted to improve power and economy as it was a woeful 24 litres per 100Klms.
Car has done 194,000 klms.
I started 2 weeks ago with a dyno run with 90 HP at rear wheels and 179 Ft Pounds. Air Fuel ratio was a super lean 14.7 across the range, standard ECU working correctly. Adam the Dyno guy suggested it was running so poorly due to being very lean.
Then fitted a K& N filter, new spark plugs Bosch Platinum and a Redback full 2.5 inch system (standard Cat). Dynoed again and came up with 94 HP.
Then Fitted DFAS from Punked Performance on Ebay $249 ( terrible customer service), this allows fuelling adjustment via MAF sensor over 128 points across rev range. JEM dyno people were great.
Went on the Dyno for final adjustment and achieved 112HP and 206 foot Pounds 24% increase in power and 15% increase in torque. Air fuel ratio now 13.0.
Very happy with the results, Truck now accelerates up long hills at 110kph.
I have just done 2000kls down to Victoria on a high country trip and the fuel economy is dramatically better. From previous 24 litres per 100 now getting 20 litres per 100 at 110kph to 115 kph fully loaded with roof rack and roof bag and 18 litre per 100 when touring at 100kph to 90 kph on back roads. This is a 28% increase in Fuel economy at 100kph.
Dyno graph attached.
I hope this helps others looking to improve the TB45E 4500.
Regards
BJNSW:)

Thanks BJNSW, I'd never heard of these before now.

Tony

G'day BJNSW, thanks for the info. So about 15% hp increase with the DFAS ($250 + fit and tune), nice. But the fuel economy improvement has sold me.

whoa, that sound good. I've already got a K&N air filter, Pacemaker extractors and tiapan exaust. Which Im all happy about the change. I am about to modify the head cylinder, only because I've blown a head gasket. So may as well do something since its off. I will have to look into the DFAS.

Fantastic. I'm having similar issues with my 4.5L and am just about to get my first dyno. Lots of great ideas to try.

Poor performance from the 4.5L Nissans seems to be a common story, but you've given me hope taht I can get an improvement with the right setup and some extra equipment.

Cheers,

Jamie.

Hi fellas,
The system that BJNSW is referring to looks just like the digital fuel adjuster kit and hand controller that jaycar sell in kit form

http://www.jaycar.com.au/productResu...11&SUBMIT.y=13

Adjuster

http://www.jaycar.com.au/productResu...x=0&SUBMIT.y=0

Hand controller

If your handy with a soldering iron it will save u a bit of cash.........

$150 + fit and tune :-) and I can solder.

edit. "looks the same" ... looks exactly the same except for 2 IC stands and silk screening.

Thanks Steve
For finding a cheaper option.
The guy from DFAS has only just replied to my enquiries after a negative ebay feedback over 3 weeks after I tried to contact him.
Would definitely recommend a DIY version from Jaycar as customer service on the DFAS unit was very poor.
Car still running very well after nearly 3000kls with new system.
Regards
BJNSW

Good work but i don't see how richening it up under power throughout the whole rev range has enabled you to get better economy while cruising.

There doesn't seem to be any change in the AFR's. You could richen it up almost the same just using the overall adjustment on the ECUTalk.

Does the module allow you to adjust the fuel under different loads as well as rpm?

There is always nistune which allows you to alter the ignition timing as well.

but.. you're going to supercharge it right? RIGHT??

:P