fuel computer
Driver
Joined: May 2001
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Originally posted by VSsc400
will it work on all models of SC and LS? and if I don't know who makes it I guess I would have to wait until it becomes public information
will it work on all models of SC and LS? and if I don't know who makes it I guess I would have to wait until it becomes public information
Just curious, as if this product/device has the potential to
F*&K-up the engine or anything else? Surprised no one else asked this question.
007
Lexus Test Driver
Joined: Jul 2001
Posts: 936
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From: California
Originally posted by retrodrive
http://www.cureline.net/lex/performance/ecu_ad1.htm
Click on the link, there is more info then you will need on that thingy!
http://www.cureline.net/lex/performance/ecu_ad1.htm
Click on the link, there is more info then you will need on that thingy!
Lexus Test Driver
Joined: Jul 2001
Posts: 936
Likes: 0
From: California
Instead of running it at one setting through the RPM range it has its own map that it follows. The dyno tune on mine does 2 things- because it was done with a tailpipe sniffer I know the car isn't running dangerously lean. Also, the computer in it compensates for ECU compensation so it doesn't go lame after a while and require resetting.
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Thread Starter
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Joined: Feb 2002
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ad1 is piggy back unit uses air flow signal to change factory fuel map. there are some differences between ad1 and full ecu upgrade. in full ecu upgraded map is set. this works but you do not get the adjustability of ad1.
yes, you can make ad1 stick to your factory map and you do not have to reset it later.
ad1's air/fuel graph shows that car is not leaning at any point. air/fuel graph doesn't get much better then this with this much of rwhp gains.
both system will work but price of ad1 is much less and you do not get much or any more hp with more expensive units.
yes, you can make ad1 stick to your factory map and you do not have to reset it later.
ad1's air/fuel graph shows that car is not leaning at any point. air/fuel graph doesn't get much better then this with this much of rwhp gains.
both system will work but price of ad1 is much less and you do not get much or any more hp with more expensive units.
Last edited by v8huntr; May 30, 2002 at 01:16 PM.
Lexus Test Driver
Joined: Jul 2001
Posts: 936
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From: California
It dosn't show the A/F below 3800 RPM.. that's 2/3 of the rev range.. the setting is fine for the higher rpms but it needs to change for the lower range and I wouldn't buy it unless I saw that it did, which I don't think it does. I like my car reliable, but that's just me.
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anything under 3800rpm is set at fatory level or little bit richer and i don't think car is leaning from factory. looking at the graph you can see that car is not leaning under full load and that's what it's most important. if you know what i mean. you should know this if you know how to map any stand alones.
Lexus Test Driver
Joined: Mar 2001
Posts: 1,205
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From: Ohio
It being an LS400 with auto tranny you wouldn't be able to see the full throttle dyno below around 3800 rpms, otherwise the tranny would kick down...
Air-fuel on the Lexus V8s is always on the lean side at part throttle and low rpm for emmissions, economy and to keep carbon deposits down. The plots at or above 15:1 don't bother me at all.
To me, the advantage of an adjustable unit over a fixed ECU is that you could potentially run more advanced timing and it would be easy to adjust the fuel ratios to suit the fuel grades being used. You could also compensate better for future upgrades like intake, exhaust, cams, etc. If its fixed, you've got it optimized for one particular configuration only.
Air-fuel on the Lexus V8s is always on the lean side at part throttle and low rpm for emmissions, economy and to keep carbon deposits down. The plots at or above 15:1 don't bother me at all.
To me, the advantage of an adjustable unit over a fixed ECU is that you could potentially run more advanced timing and it would be easy to adjust the fuel ratios to suit the fuel grades being used. You could also compensate better for future upgrades like intake, exhaust, cams, etc. If its fixed, you've got it optimized for one particular configuration only.
Lexus Test Driver
Joined: Jul 2001
Posts: 936
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From: California
It's reprogrammable - and the dyno runs I've done have been with the car in 2 and they seem accurate compared to whatever else I see. If I had to choose again I'd stick with the reprogrammable, I feel safer with it since I know what it does at all ranges, and the effects.