High ish EGT's - Thinking Injectors maybe??

[Rumcajs]

G'Day Guys.

When I tow I do tow in OD and have a converter lock but haven't towed since fitting. Iits pretty flat around here so haven't towed in any hills yet. Should I tow in OD with locked converter or not??

I would not tow in OD (4th) the ratio is 0.694:1 and the engine really has to work hard. With converter locked you also loose the stall torque ratio which means no torque multiplier in theory but with extra slip adde I'm not sure I wanna cook the tranny either...I'm not sure what diff ratio is in yours perhaps 4.3 and given 17" wheels (275/65)

How heavy is that trailer?

IMHO, towing in 3rd or direct with lockup and scaling speed a tad down should bring EGTs down too. That would be approx 2700 RPM@90km/h (for 17" wheels/tyres combo) instead of sitting bellow 2,000 RPM in 4th(OD) which where it will labor hard hence high EGTs.

For 16" stock wheels/tyres (265/70) that would be 2,700 RPM @ 90km/h in 3rd(direct) or 1,925 RPM in 4th(OD) which is again too low and it will bring high EGTs.

Regards

Note: for anyone wanting to play with gear ratios etc ==> see this site, it has Nissan Patrols transmissions listed too....

http://www.grimmjeeper.com/gears.html

[Burgz]

Good Evening Guys

Today was the perfect day to do some road testing (no wind).

The results are below:

In summary:
With no van and the chip on #5 & chip removed all stats were the same except the max EGT peaked at 590C with the chip removed and 650 & rising with setting #5.
I even did a standing start full throttle run to 130km/h and the EGT topped out at 590c about 110 and dropped to 550 by 130 under full throttle.

With the chip removed and towing my van in OD on flat road at 100km/h, 2300rpm 12psi 350C and Max EGT 590C, seems to be good.
as soon as the chip was fitted the EGT's raised at lease 70C to 420C regardless of the setting. (grrrrrrrrr)
Even driving with OD off it didnt lower the EGT's, in most cases raised it slightly.

Caravan Chip Setting OD KM/h RPM Boost PSI EGT Max EGT
NO 5 (ORIGINAL) YES 100 2300 12 300 650+
NO REMOVED YES 100 2300 12 300 590
NO REMOVED YES 130 3000 15 500 590 FLAT TO THE FLOOR
YES REMOVED YES 100 2300 12 350
YES REMOVED NO 100 3300 13 370
YES 1 YES 100 2300 13 420 550
YES 1 NO 100 3300 14 420
YES 2 YES 100 2300 13 425
YES 2 NO 100 3300 14 430
YES 3 YES 100 2300 13 420 600+
YES 3 NO 100 3300 14 420
YES 5 YES 100 2300 13 420
YES 8 YES 100 2300 14 450 700+
YES 8 NO 100 3300 14 430

From these results I feel that everything is in good condition and the chip is causing me all the troubles...
As today was perfectly still and has given best case results, any sort of head wind will push me close to the limit if I refit the chip!!!

So does anyone know if I can get my chip reprogrammed?

Any suggestions on what to do from here would be great..

Thanks again Guys

Chat soon

Burgz

[mudski]

I'd be selling the chip and either buying a different branded chip or getting the ECU remapped. Both costly though. I ran a DP chip in my ol' Di without issues. Chips are plug and pray where as a ECU remap is permanent. So if you ever need to take your Patrol to Ni$$an, or any workshop really, they could simply see your ECU as being fubar and blame what ever issues you are seeing on that. Theres good and bad sides to both.
But maybe contact Roo systems and talk to them. Not sure how well you will go but its worth a try.

[threedogs]

If you are running the CC intercooler you really should
be running the wide Fairlane style scoop, sorry but I dont
have a link, @strop will know where to get one, just
chasing your tail without one