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Not opening up to full potential. 

 

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 Post subject: Not opening up to full potential.
Posted: Wed Apr 09, 2008 10:00 pm 
Getting Side Ways
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Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

G'day guys.

I have a problem with my auto xr8 that is bugging me.

On take off I floor the pedal into the sump, it goes great (after 15 mins just warm) but it changes from first to 2nd to early. It changes at around 4600 rpm, about 900 rpm shy (and where I am making the most grunt/boost).

The problem gets worse when the car is warm (after 30 mins of driving). It wil change at around 4300 rpm.

Now I have just recently got the auto rebuilt and beefed up, it still did it before too but with slippage.

A couple of questions.

1. What could the culpirit be? I know it could be a range of things, Maybe the tune? Maybe throttle position when opened (havent checked yet), could it be the box? I am not running a XR8 ecu either (v8 fairlane NF) so could maybe that have an effect? Maybe the Capa chip?

2. What would be a way around it other than shifting manually (which is a pain)?


It really bugs me, on the dyno chart, it looks to be missing out on 30 odd horsepower shifting early and almost 1 psi (as its a centrifugal blower) with the revs missing up top.

Any help would be much appreciated as I'd have some sort of understanding on the situation.

Cheers

jason.

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Wed Apr 09, 2008 10:11 pm 
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i think ecu has shift points and load mapped,same as fuel maps.

 

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Posted: Wed Apr 09, 2008 11:34 pm 
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Ride: 1999 XHII XR8, 2002 AU Fairmont

Power: 236 rwkw

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Jas, not sure if the TPS would do it but its definately worth checking them both and setting them to as close to 0.98v as possible without going over.

 

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Posted: Thu Apr 10, 2008 12:31 am 
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Sounds like it's trans temp related (TTL pin 34) but could be a number of things.....Do a self test.
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Posted: Thu Apr 10, 2008 12:41 am 
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Don't want to sound like a complete idiot here, but could it just be that the throttle cable has stretched?

 

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Posted: Thu Apr 10, 2008 12:44 am 
Getting Side Ways
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Ride: ef xr8

Power: 229 rwkw

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WA, Australia

Cheers guys.

Pete, I think it might be temp trans related, as the warmer it gets (at the drags after 3 runs it shifts 300 rpm lower, sometimes more) but would it be a sensor or perhaps it needs a bigger trans cooler (one bigger than a open wallet)? How would you do a self test?

Jeff, the TPS has been set at around .98v, but I will check again this weekend, just to make sure.

Just in the next couple of weeks I want to change the gears for a better ratio, just dont wanna run out of revs too early before it makes its power.

Cheers

Jason.

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Thu Apr 10, 2008 12:45 am 
Getting Side Ways
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Age: 33

Posts: 2058

Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

haggis wrote:
Don't want to sound like a complete idiot here, but could it just be that the throttle cable has stretched?


Throttle cable has been replaced a year ago. :wink:

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Thu Apr 10, 2008 12:59 am 
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Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

Yes it could be the actual trans temp sensor or a fault in the TTL line from the TCU to the EEC. The trans TPS is less critical for peformance than the EEC TPS so as long as it's under 1.01V it'll be ok.
Is there anything else it does wrong like in terms of the actual shift speed, downshift timing/speed or converter lock up timing. Is it actually locking up in 3rd and 4th for example?
There are plenty of posts about doing a self test....sorry but I'm sick explaining it. Do a trans controller self test first then an EEC self test.

Pete.
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Posted: Thu Apr 10, 2008 1:11 am 
Getting Side Ways
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Age: 33

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Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

Puting you foot down trying to kick down a gear, it can be a tad sluggish to do so, sometimes it is hesitant to as well.

I will look up the self tests tomorrow too, can imagine explaining things a few to many times.

I'll see by the weekend hopefully it sorted, not much of a mechanic my self, shame I cant just use a sledge.

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sat May 24, 2008 12:27 am 
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Joined: 23rd Dec 2007

Ride: AU1 XR8

Did you find/fix the problem..
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Posted: Sat May 24, 2008 12:33 am 
Getting Side Ways
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Age: 33

Posts: 2058

Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

I'll let you know after this weekend.

Hoping its the throttle body not opening completely, giving the tps a 3/4 throttle reding instead of WOT.

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

Top
 Profile  
 
 
Posted: Sat May 24, 2008 12:53 pm 
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Joined: 27th Jan 2007

Ride: Supercharged BA XL ute

Location: Gordonvale
QLD, Australia

Does the AU have a learning computer?
It may be the S5 wound in too far for your map settings.As the oil gets hotter it gets thinner and the S5 is a pressure regulating solenoid causing it to shift too early,it may even thouugh not often be evil spirits.

 

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Posted: Sat May 24, 2008 1:37 pm 
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Location: Brisvegas
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What AU is it? AU 1, 2 or 3?

Are the XR8's the same as the T series where you can put the auto in 3 different modes? Econ, Performance or Self Learning?

It might have been only the T3's and the Pursuit Utes, but may be worth having a look at your manual. You change it by moving the gear shift around when the car is in Acc (i.e. not started)

Just a thought.

 

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Posted: Sat May 24, 2008 3:39 pm 
Getting Side Ways
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Age: 33

Posts: 2058

Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

Lol its an EF guys.

The only code that appeared on the self test was the trans temp too high which seemed odd, found a leak in the tranny cooler line and rescanned and nothing appeared which was strange.

It now shifts past 5000 (just) and the throttle isnt open completely opening, so thats where my money is at the moment.

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

Top
 Profile  
 
 
Posted: Sat May 24, 2008 3:41 pm 
Getting Side Ways
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Age: 32

Posts: 967

Joined: 8th Nov 2004

Gallery: 7 images

Ride: TE50

Location: Brisvegas
QLD, Australia

Lol, I dont know how I assumes it was an AU :)

In that case I think your money is safe. I had a problem with my TPS and butterfly opening which gave me all sorts of problems too till I fixed it.

Good luck and make sure you keep us updated!

 

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