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Thread: z20let and F23 gear box question

  
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    willhumphrey's Avatar
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    z20let and F23 gear box question

    hi there ive got my astra sri turbo and its running around 260/270 bhp and i was woundering if any one would know what it will do top end .. will it hit the limiter or will the gearbox run out ??

    what sort of speed do you gyes think it will do top end considering i had 148 when it was standard

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    coupe turbo's Avatar
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    Hi, gearbox is ok. In my experience limit is 480-500hp and torque limit seems around 500nm. I damaged it with more overboost around 540-550nm. For top speed what is your rpm limitor? If around 7400rpm u can achieve 280-285km/h something like that. If rpm limitor is stock around 255km/h. may be alittle bit more or less.


    BHP/Vmax Powered 500bhpACT

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    thanks alot mate , thats unreal ! lol thats like 177 mph .. how do you find out this sort off info lol isit just experiance or something ?

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    Do your own sums using 24.7MPH per 100RPM in top gear for the Astra Gsi. If you want slightly higher top end, fut a box from a zafira Gsi which is leggier at 25.9MPH per 1000Rpm

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    how does the vxr m32 compare?

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    Quote Originally Posted by willhumphrey View Post
    thanks alot mate , thats unreal ! lol thats like 177 mph .. how do you find out this sort off info lol isit just experiance or something ?
    On my car and my customers cars. As I see limits are always damaged when u got higher torque then 500nm. When u compare m32, m32 seems stronger then it. We ll see, may be same spec astra h opc we ll do. And we ll se if damaged or not.


    BHP/Vmax Powered 500bhpACT

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    Quote Originally Posted by inmyvain View Post
    how does the vxr m32 compare?
    Astra VXR 31.9mph per 1000 RPM, That was the early models, don't know if that has changed. Again, the zaf VXR model may be different again.



    Zafira GSi does 25.9mph per 1000 RPM in top
    Astra GSi 24.7mph per 1000 RPM
    Coupe 2.2 22.4mph per 1000 RPM
    Zafira 1.8 19.9mph per 1000 RPM

    Astra VXR 31.9mph per 1000 RPM
    Monaro VXR 44.3mph per 1000 RPM
    Astra 2.0 Di 28.0mph per 1000 RPM

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    so if its 24.7 per 1k .. my car revs to 8k so thats 24.7 x 8 ?? thats 197.6 .. and im guessing those facts are about standard cars .. mines been maped and modded so im guesing it would be diffrent ?

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    Quote Originally Posted by willhumphrey View Post
    so if its 24.7 per 1k .. my car revs to 8k so thats 24.7 x 8 ?? thats 197.6 .. and im guessing those facts are about standard cars .. mines been maped and modded so im guesing it would be diffrent ?
    Yes, those figures are for standard boxes and the fact that you have a remapped car won't affect the gearing at all, just the ability of the engine to overcome the gearing as it revs.

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    Dont think there is much chance of you seeing 197.6mph!
    You might see 160 if your lucky, down hill, with a tail wind.

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