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Discussion Starter #1
hi to all
ive just got jr filter and a jt60 cat back exhaust 3" .my aero is a auto i plan to renew the autuator too .how far can i go with out blowing the box? and after fitting the pipe would it be wise to see if the boost needs reajusting
jt60 nice pipe me still grining
 

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Well the auto is rated to around 300NM Torque.. anything after that and you are on your own..

If you want to tune/tweek your 9000 auto then you are going to have to accept that autoboxes are a disposable item .

Tweeking the boost pressure higher will result in big torque spikes.. so if you do it.. be careful how you drive the car.
 

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Discussion Starter #4
not good news so shall i leave it just with the pipe air fillter it got a beter re-dump valve and renew the actuator then no more mods . how is the 300nm worked out in terms of bhp is the car at the limit now ....thanks for the comments
 

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The 5 speed auto box on the latest 9-5 is rated by Saab at 350 Nm. That's not to say it can't take more, but the petrol 2.3 Aero produces this torque at 1900 rpm and has an auto option. The 3.0 V6 diesel has the same torque but from 1800 to 3000rpm and there is no auto available. So, I would say that 350Nm is near the limit for long term health of the gearbox.
 

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Originally posted by lizard:
[qb]not good news      so shall i leave it just with the pipe air fillter it got a beter re-dump valve and renew the actuator then no more mods     . how is the 300nm worked out in terms of bhp is the car at the limit now     ....thanks for the comments  
 [/qb][/b]
There are plenty of people putting 240-250bhp through a 9000 auto, which is probably the upper limit, but it's torque not hp that shags the autobox, especially in the lower gears where there is no partial or full mechanical lock-up.
So, you can go to this level with a ECU upgrade but you will be advised to be careful with the right foot until into 3rd.
The other route is to leave the ECu alone and increase engine efficiency and breathing, i.e.
3" JT downpipe and sport cat to go with the rest of your new system, high flow intercooler, gas flowed cylinder head.
Horses for courses as they say......
 

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Not sure,
But, the 9000 ZF autobox is better suited to the 3.0V6 rather than the 2.3FPT, as the V6 develops it's torque higher up the rev band than the 2.3FPT's and so aids gearbox life.
 

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Discussion Starter #9
thanks aeropilot
that sound good to me i go done that path sort the cat and down pipe i get head sorted when me do the dreaded chains
 

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Originally posted by lizard:
[qb]how is the 300nm worked out in terms of bhp is the car at the limit now     ....thanks for the comments  
 [/qb][/b]
Power = torque x rotational speed.

The unusual thing about the Saab turbo engine is that it produces maximum torque very low in the rev range, at 1900 rpm. Have a look at Maptun's graph and you'll see that the torque curve is flat to about 3500 rpm. (The graph is for a manual, so it's a bit over 300Nm). You can see how easy it is to run at maximum torque for a lot of your driving time.
 

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I think I may be the only person who has replied to this thread that has actually boosted the power to his 9000 auto.

i.e. I did the following to my 2.3 FPT Auto.

3'' exhaust including downpipe.
airfilter
uprated actuator
abbott software di/apc
abbott gas flowed head
airco removal
forge dumpvalve

Within 3 months of doing the mods, the gearbox's internals (it was the clutch pack and torque convertor) destroyed themselves.

I then had to spend circa 1700 euro on a complete autobox overhaul and refurb.

Within 1 month of that the governor was trashed and needed replaced.

The car never properly kicked down after the overhaul because the torque that the engine made confused the box's shift times. (at least that's what the auto specialists told me)

I've since sold the car, and the new owner had another fault with the governor it seems.. (again fixed under warranty!).. I've very glad that I took the car to a reputable auto specialist with a good warranty.

Otherwise that would have been 3 replacement second hand boxes probably in the space of 6 months.

So, when I say, I don't recommend upgrading the engine with this HF4 ZF box.. I'm coming from personal experience here.
 

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Gassy has also upgraded his 2.3FPT 9000 Auto to approx 270BHP (I think - well over 200 anyway). Don't know of any problems he's had. His car is well into the 200,000's and is running on LPG.
 

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I'm starting to get a little concerned now as to the life expectancy of the auto box in my NG900 with the 3.0L running through it (approx 300NM).
 

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Ian,
I'd only get concerned if the autobox in the 900 is torque rated lower than the ZF auto in the V6 9000's. If the boxes are the same, then no need to worry. Don't forget it's the monster torque at low revs produced by the FPT 4cyls that cause these gearbox problems, not a problem with the V6's.
 

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Discussion Starter #15
so end of the day dont play with a auto by the sound of it well i stick to what ive done sort a boost gauge to c what its boosting at re just to spec i be happy if i could take it to 240bhp ive sean ads 4 recon auto boxs £750 fitted
what do u do apart from converting or buying a geared 9000aero ..............Mmmmm .......
 
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