51 replies to this topic

[me madjoe 90]

Got 85mph out off my 998 standerd on mile road using all the revs it had. So about 30 bhp as its done 60thousand miles

Dont know my crown and pinion ratio as the engine is not out of the same model i dont belive.

12" wheels 145/70 tyres

Edited by me madjoe 90, 03 March 2011 - 09:28 PM.

[Stevee]

My Horse Power = 0
My Top End = 0
My 0 - 60 = 2 years and counting...

[lawnmowercrap]

I'll answer though there are usually some ridiculous claims....

97BHP 153ft lbs Torque at, I think, 4300 Rpm. Best i've had out of it is 108mph according to Sat Nav and my mates ZR but it felt as though it could have kept going, at about 4900rpm at the time I think.... Wouldnt want to go any faster, its all about the corners... Oh, and Im on 10" Wheels

Edited by lawnmowercrap, 03 March 2011 - 11:03 PM.

[M44K TS]

My BHP? About 1 human power.

My top speed? Depends if I'm running to catch the pizza shop before it closes or not.

Edited by M44K TS, 03 March 2011 - 09:24 PM.

[lawnmowercrap]

Oh, and those resistor 'chips' do actually work, depends entirely on how easy the ECU is to trick.
They are literally just a resistor though, no chip. You put in place of either the MAF sensor or the coolant temp sensor.
It tricks the engine to thinking its either drawing in more air than it is, so it over fuels it, or tricks it to thinking its constantly cold, so it overfuels the engine.

The MAF one will cause the EML to come on though, because the 02 sensors wont agree with the overfuelling.

Edited by lawnmowercrap, 03 March 2011 - 09:55 PM.

[andymini12]

Oh, and those resistor 'chips' do actually work.
They are literally just a resistor though, no chip. You put in place of either the MAF sensor or the coolant temp sensor.
It tricks the engine to thinking its either drawing in more air than it is, so it over fuels it, or tricks it to thinking its constantly cold, so it overfuels the engine.

The MAF one will cause the EML to come on though, because the 02 sensors wont agree with the overfuelling.

but that carn't add 20 brake

[lawnmowercrap]

Depends entirely on how well the engine can cope with its new found fuel. If its an engine that has the ability to bypass the ECU's decision to run open loop on the 02 sensors then it wouldnt make a difference.

Get a V6 or a V8 thats over fuelling I bet it wouldnt be far off.

*EDIT* Must add that it is a very noticeable amount of MPG loss and the Cat wont last long...

Edited by lawnmowercrap, 03 March 2011 - 09:41 PM.

[JoneseyBoy]

My dino says 82. It's a 998 with a 270 cam and a stage one kit. It's got 54BHP 55LBFT

[me madjoe 90]

Oh, and those resistor 'chips' do actually work.
They are literally just a resistor though, no chip. You put in place of either the MAF sensor or the coolant temp sensor.
It tricks the engine to thinking its either drawing in more air than it is, so it over fuels it, or tricks it to thinking its constantly cold, so it overfuels the engine.

The MAF one will cause the EML to come on though, because the 02 sensors wont agree with the overfuelling.

but that carn't add 20 brake

No point just get it re mapped or properly chiped.


That will just end up making the ECU go into limp mode, ruin in the lamda sensor and confuse the ECU which will just weeken the fueling off to bring the lamda reading back. Mignt even open the air bipass valve/idle control valve. And then bring up a fault code for the map sensor or mass airflow meter. Something along these lines

The fueling will richen up on accleration to the maximum needed to get the most out of a standerd modern engine. If you add air filter and add an exhuast maby port it and so on then it should be re maped for these modifactions to work. You can't trick an ECU all you'll do is confuse it.

[jaysmini30]

i got mini thirty
998cc
top speed 91mph
stage 1 kit

[lawnmowercrap]

Oh, and those resistor 'chips' do actually work.
They are literally just a resistor though, no chip. You put in place of either the MAF sensor or the coolant temp sensor.
It tricks the engine to thinking its either drawing in more air than it is, so it over fuels it, or tricks it to thinking its constantly cold, so it overfuels the engine.

The MAF one will cause the EML to come on though, because the 02 sensors wont agree with the overfuelling.

but that carn't add 20 brake

No point just get it re mapped or properly chiped.


That will just end up making the ECU go into limp mode, ruin in the lamda sensor and confuse the ECU which will just weeken the fueling off to bring the lamda reading back. Mignt even open the air bipass valve/idle control valve. And then bring up a fault code for the map sensor or mass airflow meter. Something along these lines

The fueling will richen up on accleration to the maximum needed to get the most out of a standerd modern engine. If you add air filter and add an exhuast maby port it and so on then it should be re maped for these modifactions to work. You can't trick an ECU all you'll do is confuse it.

Couldnt agree more on doing it properly, however, like I have previously stated the engine has to have the ability to over ride the ECU's decision to run open loop in order for the EML to be thrown on. And to find this on anything other than VAG cars is raaaaaaare.
Open loop is used during cold start where the ECU completely disregards the reading from the 02 Sensors because it is over fueling due to cold start. It stays in this mode until the Cat gets up to operating temperature meaning the 02 sensors are reading accordingly.

Edited by lawnmowercrap, 03 March 2011 - 09:50 PM.

[secondopsman]

Hopefully about 140 bhp and a top speed of 120+ but its a c16xe conversion on bike carbs

[HARBER07]

Lmfao. Someone actually tried one of these resistors on a proper dyno on MIG. Unsurprisingly the engine lost about 15-20bhp compared to the previous run without the "modification".

[maggies_minder]

on smarts rollers the weekend before last my 1275 had 70BHP and 96torques,

its a standard 1275 with a typical keystage 1 setup.

he had it upto 105 on the roller a 6k in forth,

my fastest is about 80 but the speedo was all over the gaff and my door started wobbling.

[me madjoe 90]

Oh, and those resistor 'chips' do actually work.
They are literally just a resistor though, no chip. You put in place of either the MAF sensor or the coolant temp sensor.
It tricks the engine to thinking its either drawing in more air than it is, so it over fuels it, or tricks it to thinking its constantly cold, so it overfuels the engine.

The MAF one will cause the EML to come on though, because the 02 sensors wont agree with the overfuelling.

but that carn't add 20 brake

No point just get it re mapped or properly chiped.


That will just end up making the ECU go into limp mode, ruin in the lamda sensor and confuse the ECU which will just weeken the fueling off to bring the lamda reading back. Mignt even open the air bipass valve/idle control valve. And then bring up a fault code for the map sensor or mass airflow meter. Something along these lines

The fueling will richen up on accleration to the maximum needed to get the most out of a standerd modern engine. If you add air filter and add an exhuast maby port it and so on then it should be re maped for these modifactions to work. You can't trick an ECU all you'll do is confuse it.

Couldnt agree more on doing it properly, however, like I have previously stated the engine has to have the ability to over ride the ECU's decision to run open loop in order for the EML to be thrown on. And to find this on anything other than VAG cars is raaaaaaare.
Open loop is used during cold start where the ECU completely disregards the reading from the 02 Sensors because it is over fueling due to cold start. It stays in this mode until the Cat gets up to operating temperature meaning the 02 sensors are reading accordingly.

I see your point but it still wouldent work.

There is less power when the car is being overfueled to allow the car to start. Even on open loop the resister would still resist the already very low voltage signal from the maf sensor or air temp sensor making the signal even lower. The signal would be so week the ECU might not even reconise it as being there.

The correct air fuel ratio is stoichiometric or 14.7-1 messured in wieght, so on start up this isnt there and the ratio is not correct its rich as the lamda sensor is not reading as its not reached around 300degrees. The fuel mixture is rich... this dosent make more power.

This is open loop as you stated but in closed loop it also wouldnt work as the ECU will see the mixture is incorect and try to compensatete in other areas.
When you put your foot down the ECU ignores the Lamda sensor and is in open loop and richens the mixture just enougth to get the most out of the engine depending on mass air flow and or throttel position.

Edited by me madjoe 90, 04 March 2011 - 12:01 AM.