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Registered:
January 2003
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speed limiter and the powerchip
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Sun, 05 January 2003 23:56
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Hi,
I have a couple of questions regarding the 7M-GTE engine...
I require the 180km/h speed limiter to be removed somehow, due to the car being used on the track.
I would like to know whether the powerchip piggyback computer is a waste of time and money at $890. They claim a 30kW boost in power over stock, but to do this they also increase boost by 2 psi.
I would also like to know how much the powerchip is actually doing, so how much power could you expect from increasing boost by 2 psi over stock without the chip. One thing in the powerchip's favour is that they said that when the chip is installed they can remove the speed limiter.
I am not looking at large power increases, as it starts to cost $$$ to make the 7M engine reliable it higher boost pressures, so with a stock engine with stock head gasket torqued to 72lb/ft (as mine is) what sort of boost pressure is acceptable without overly compromising the reliabilty of the engine?
These probably have been covered at some stage in the forums, but I can't find all these answers. Any help appreciated.
Thanks,
Alan
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Location:
Epping NSW
Registered:
October 2002
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Re: speed limiter and the powerchip
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Wed, 15 January 2003 05:59
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From memory the power increase provided by upping the boost on the stock turbo is 11 bhp per psi, so a 2 psi increase would only account for around half of the 30kw power increase claimed.
BTW who makes the chip? i didn't think many companies made them for the 7MGTE anymore.
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Registered:
January 2003
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Re: speed limiter and the powerchip
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Wed, 15 January 2003 08:34
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My car is a Jap import. It has only been on the track once (at Sandown) where I could only just reach 180km/h on the straights anyway, so I am not 100% sure it is limited. I am hoping to go on Calder Park, Winton and Phillip Island though, where I am told the speeds reached can be higher. At this stage I think I will wait for the next track day to see for sure if it is limited.
It is a bit of a worry with the powerchip not being dyno tuned specifically for each individual vehicle, but being created for a generic model. From a data sheet they sent me, it seems that the boost is increased, and the powerchip just optimises the ignition timing for the increased boost (and for the fuel RON specified). I don't think the mixtures could really be modified due to the the ECU having an embedded unmodifyable processor.
The ~15kw power increase from the boost increase seems about right, due to powerchip claiming 18kW for the 7M-GE, because obviously they cannot increase boost on that engine!
I have no idea who makes the powerchip, but the website is:
www.powerchipgroup.com
Thanks for your replies.
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: speed limiter and the powerchip
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Wed, 15 January 2003 13:38
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You may find that with exhaust / intake mods you make in order of those benefits anyway.
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