Fuel/Boost Cut Controller UFCC
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Joined: Mar 2000
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Hello, I'm Pete and I've designed an electronic gadget to control the fuel/boost cut.
It was designed specifically for my Supra but the principle is the same. To allow the MAP pressure sensor reading to reach the ECU for readings just below the cut threshold and to limit it to an output level just below this threshold for higher MAP pressures.
The idea is to fool the ECU into thinking the boost is lower than it actually is.
So adding a boost controller or bleeder "T" plus this UFCC (Universal Fuel Cut Controller) should form a real basic mod for the scoobe. (Plus exhaust etc)
Is anybody interested in such a device. I've sold loads to the Supra owners group and I've been running mine for the last year without any problem.
Cost is £50+VAT
Anybody interested. Are there any other gadgets you would ideally like designed. If you haven't guessed I'm an electronics enginner and want to build up a business in performance mods for Japanese performance cars. The device should also work for the MR2 and other Jap cars.
Let me know what you think. (Be gentle!)
You can contact quickly on peter.betts@nokia.com or reply to this posting.
Pete
It was designed specifically for my Supra but the principle is the same. To allow the MAP pressure sensor reading to reach the ECU for readings just below the cut threshold and to limit it to an output level just below this threshold for higher MAP pressures.
The idea is to fool the ECU into thinking the boost is lower than it actually is.
So adding a boost controller or bleeder "T" plus this UFCC (Universal Fuel Cut Controller) should form a real basic mod for the scoobe. (Plus exhaust etc)
Is anybody interested in such a device. I've sold loads to the Supra owners group and I've been running mine for the last year without any problem.
Cost is £50+VAT
Anybody interested. Are there any other gadgets you would ideally like designed. If you haven't guessed I'm an electronics enginner and want to build up a business in performance mods for Japanese performance cars. The device should also work for the MR2 and other Jap cars.
Let me know what you think. (Be gentle!)
You can contact quickly on peter.betts@nokia.com or reply to this posting.
Pete
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Joined: Apr 1999
Posts: 1,035
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Nothing wrong with a bleed valve mod.... (within limits)
Not sure about the wisdom of defeating the fuel cut defender though... On UK scoobs at least, it is set fairly close to the standard boost limit which might imply that you don't have too much headroom in terms of the upper extent of the ECU fuel/ignition maps, or possibly mechanical limits.
Cheers,
Alex
[This message has been edited by AlexM (edited 14-03-2000).]
Not sure about the wisdom of defeating the fuel cut defender though... On UK scoobs at least, it is set fairly close to the standard boost limit which might imply that you don't have too much headroom in terms of the upper extent of the ECU fuel/ignition maps, or possibly mechanical limits.
Cheers,
Alex
[This message has been edited by AlexM (edited 14-03-2000).]
Thread Starter
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Joined: Mar 2000
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***********
Not sure about the wisdom of defeating the fuel cut defender though...
***********
This may be true. I'm not sure how your fueling maps are done. The Supra runs so rich under full throttle that any increase in boost is well catered for and adding water injection will mean you can use more fuel for power rather than for cooling the charge temperature.
On a stock Scoobe what is the max PSI anyone has run safetly and is this below the stock fuel/boost cut limit?
What does this Superchips mod do then. I thought that raised the fuel/boost cut?
Pete
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Joined: Apr 1999
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Pete,
You're right, that is exactly what the old superchips kit contained - a bleed valve and a device which limits the boost pressure that the ECU sees.
For a UK car, I think the factory ECU overboost cutout is set at 1.15bar, and 1.3bar for the Stis.
The upper limit can be higher than this if you ensure that there is no knocking, and use a programmable ECU to allow adjustment of the fuelling and ignition maps.
Pistons seem to be a weak point on the Subaru engine, so exhaust gas temperatures are probably critical on high boost set-ups.
There have been reports of some cars fitted with a superchips type device going bang so they don't have the best reputation on this BBS. I think Superchips don't sell them anymore.
Lee Christie is our bleed valve expert - I think he got good results from his set-up, but has now gone for a fully programmable aftermarket ECU.
Cheers,
Alex
You're right, that is exactly what the old superchips kit contained - a bleed valve and a device which limits the boost pressure that the ECU sees.
For a UK car, I think the factory ECU overboost cutout is set at 1.15bar, and 1.3bar for the Stis.
The upper limit can be higher than this if you ensure that there is no knocking, and use a programmable ECU to allow adjustment of the fuelling and ignition maps.
Pistons seem to be a weak point on the Subaru engine, so exhaust gas temperatures are probably critical on high boost set-ups.
There have been reports of some cars fitted with a superchips type device going bang so they don't have the best reputation on this BBS. I think Superchips don't sell them anymore.
Lee Christie is our bleed valve expert - I think he got good results from his set-up, but has now gone for a fully programmable aftermarket ECU.
Cheers,
Alex
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Joined: Mar 1999
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From: Swindon
In fact its possible to raise the boost by using a single diode ... total cost next to nothing. I will not post on how to do this but if anyone wants to know then please mail me. It will affect the boost cut though. It can be enhanced a bit using a bleed valve. On its own it should raise boost by approx 0.15 bar across the range.
Bob
Bob
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From: Essex
Daresay I should pop a comment in 
As always my comments relate to a MY99..no experience on anything else..
From all the people I've spoken to 18psi would seem to be the sensible limit. I have managed to get pretty close to that using just a bleedin valve (moray )
what pete has designed here is the superchips defender chip..where he may succeed (and where a number of superchips cases did not) is setting the clamp point very close to the limit. I.e if the limit is 18psi, setting it to 17.5.
Where the superchips went wrong I'm told was in this clamping figure. Its been reported that some cars were 'clamped' at 14-15psi, if the ECU is 'only' seeing this figure then the fuelling/ignition would be way out when the boost is really 18.
But if you can clamp as near as dammit to 18psi then you'll get the benefit of the extra bhp/torque without the fuel cut - and yes the subaru is pretty rich and I never had any problems. I got about 12bhp and 12lb/ft increase.
Yes I now run a Link ECU and with exhaust/filter/mapping the best so far on a MY99 is 278bhp (PE's road) so I'm chasing that !
Incidentally I don't think the limit of 18psi is anything to do with detting - I (and others) have on occasion reached 20's with no knocking (by accident btw) - but the mechanical forces involved are too much for the pistons (there was a huge post with pics on here a while back from a guy running high boost and he covered quite a few miles before the piston edges gave way)
best of luck pete.
As always my comments relate to a MY99..no experience on anything else..
From all the people I've spoken to 18psi would seem to be the sensible limit. I have managed to get pretty close to that using just a bleedin valve (moray
)what pete has designed here is the superchips defender chip..where he may succeed (and where a number of superchips cases did not) is setting the clamp point very close to the limit. I.e if the limit is 18psi, setting it to 17.5.
Where the superchips went wrong I'm told was in this clamping figure. Its been reported that some cars were 'clamped' at 14-15psi, if the ECU is 'only' seeing this figure then the fuelling/ignition would be way out when the boost is really 18.
But if you can clamp as near as dammit to 18psi then you'll get the benefit of the extra bhp/torque without the fuel cut - and yes the subaru is pretty rich and I never had any problems. I got about 12bhp and 12lb/ft increase.
Yes I now run a Link ECU and with exhaust/filter/mapping the best so far on a MY99 is 278bhp (PE's road) so I'm chasing that !
Incidentally I don't think the limit of 18psi is anything to do with detting - I (and others) have on occasion reached 20's with no knocking (by accident btw) - but the mechanical forces involved are too much for the pistons (there was a huge post with pics on here a while back from a guy running high boost and he covered quite a few miles before the piston edges gave way)
best of luck pete.
Thread Starter
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Joined: Mar 2000
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****************
what pete has designed here is the superchips defender chip..where he may succeed is setting the clamp point very close to the limit. I.e if the limit is 18psi, setting it to 17.5.
But if you can clamp as near as dammit to 18psi .....etc
************
Exactly. The device can be accurately set up to any input voltage threshold and clamp it at that threshold but the added advantage is that you can set another threshold to protect against overboosting. An overboost threshold.
Therefore you can set the lower threshold to just below the point at which the normal stock boost cut occurs and set the overboost threshold to a limit that you feel safe with. If say your bleed valve fell off or the electronic boost controller went **** up then the overboost protection would be their to force a boost cut. Harsh but a damb sight better than the engine going bang.
Regards the diode. It's simple and effective but not adjustable/tunable for individual cars MAP sensors and doesn't raise the boost cut it just removes it. Simplicity sometimes rules though, a nice idea! :-)
Myself and a fellow designer are starting a business designing
Boost controllers,
turbo timers
0-60mph and 1/4 mile drag strip counters
variable power steering controllers
speed delimiters
Speed convereters for the Jap imports
etc etc
the list goes on.
If you would like to see something designed at a competetive price by a UK company and cheaper than the Jap parts such as HKS, Greddy, Blitz then let me know.
However daft. Give me you ideas or wish list and we'll see what we can do.
Pete
what pete has designed here is the superchips defender chip..where he may succeed is setting the clamp point very close to the limit. I.e if the limit is 18psi, setting it to 17.5.
But if you can clamp as near as dammit to 18psi .....etc
************
Exactly. The device can be accurately set up to any input voltage threshold and clamp it at that threshold but the added advantage is that you can set another threshold to protect against overboosting. An overboost threshold.
Therefore you can set the lower threshold to just below the point at which the normal stock boost cut occurs and set the overboost threshold to a limit that you feel safe with. If say your bleed valve fell off or the electronic boost controller went **** up then the overboost protection would be their to force a boost cut. Harsh but a damb sight better than the engine going bang.
Regards the diode. It's simple and effective but not adjustable/tunable for individual cars MAP sensors and doesn't raise the boost cut it just removes it. Simplicity sometimes rules though, a nice idea! :-)
Myself and a fellow designer are starting a business designing
Boost controllers,
turbo timers
0-60mph and 1/4 mile drag strip counters
variable power steering controllers
speed delimiters
Speed convereters for the Jap imports
etc etc
the list goes on.
If you would like to see something designed at a competetive price by a UK company and cheaper than the Jap parts such as HKS, Greddy, Blitz then let me know.
However daft. Give me you ideas or wish list and we'll see what we can do.
Pete
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