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IPD Intake Plenum - 997.1 Turbo

J

JP_Turbo

Silverstone
Joined
27 Jan 2015
Messages
102
Gents,

Seen this mod on a friends car. Anyone done it? His car is mapped so not really sure of the difference with this on a stock 997.1 or if its even worth the efforts.

Apprantly you have to change the trottle body to an 84mm version aswell.
 
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
 
:eek: surely that can't be true? please do elaborate
 
solaris said:
:eek: surely that can't be true? please do elaborate
Click to expand...

The ECU does not have the ability to adapt hence low speed partial throttle inputs lose smooth OEM feel.
 
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
 
996ttalot said:
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
Click to expand...


Thank you Ken for clearing that up - i was just about to make my do88 y-pipe into a coat hanger
 
996ttalot said:
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
Click to expand...

Someone who knows a little bit more than me about it :p

No point on a car thats not being mapped. You'd be better off with a sports exhaust if you have not already got one :thumbs:
 
Great input for Ken :worship: still watching this with interest :thumb: :popcorn: :popcorn: :popcorn:
 
996ttalot said:
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
Click to expand...

Thanks for clarifying this.

So the 74mm IPD will be the better option with no map required.

Roughly what gains would you get? Besides smoother power delivery?
 
JP_Turbo said:
996ttalot said:
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
Click to expand...

Thanks for clarifying this.

So the 74mm IPD will be the better option with no map required.

Roughly what gains would you get? Besides smoother power delivery?
Click to expand...
With the 74mm you gain in the middle range rather than mid and top end together as in the 82mm.

It is plug and play - it adapts almost immediately. You gain around 15-20hp/tq in the midrange.

Ken
 
solaris said:
996ttalot said:
Desert Dragon said:
No point especially as car is not mapped. Messes with low speed throttle response as the ECU can never adapt to the larger plenum and throttle body - tuners won't tell you this :hand:
Click to expand...
Tuners will tell you..maybe not all of them, but for the sake of clarification

- if you fit the 74mm IPD then the car will adapt without issue and you will gain power in the mid range
- if you fit the 82mm version, you have to fit the gt3 TB, and then you must tune for it and it takes a lot of time to get correct, as whilst it doesn't affect on boost running so much, it makes a lot of difference to partial throttle and low speed running.

With the 82mm version if you don't tune, the ECU will make a compensation table, so the car will still run etc, but the compensation table is as described - it does not take benefit of the modification.

Either option above (size) will make a difference to performance.

Ken
Click to expand...


Thank you Ken for clearing that up - i was just about to make my do88 y-pipe into a coat hanger
Click to expand...

Y pipe completely different part to larger plenum and throttle body ;)
 
I'll elaborate a little on Ken's explanation.

ECU has a function which converts airflow into throttle plate angle, and throttle angle into airflow.

What happens is that after all the internal calculations are complete, the ECU decides on an airflow target and it then sends that to another function which sets the throttle angle in order to acheive that airflow.


The problem with a larger throttle body is that the ECU sends out the wrong throttle angle - smaller angle is now needed for a given airflow. It will eventually correct as it's a closed loop system, but it means that the part throttle response will always be a bit odd.

When we re-calibrate the software, we put the correct transfer function in for the new throttle body. Well, most tuners don't but the best do..

M.
 
Mezgerite said:
I'll elaborate a little on Ken's explanation.

ECU has a function which converts airflow into throttle plate angle, and throttle angle into airflow.

What happens is that after all the internal calculations are complete, the ECU decides on an airflow target and it then sends that to another function which sets the throttle angle in order to acheive that airflow.


The problem with a larger throttle body is that the ECU sends out the wrong throttle angle - smaller angle is now needed for a given airflow. It will eventually correct as it's a closed loop system, but it means that the part throttle response will always be a bit odd.

When we re-calibrate the software, we put the correct transfer function in for the new throttle body. Well, most tuners don't but the best do..

M.
Click to expand...
Is it easier not to just run mafless? This is what many tuners do but its still not perfect on partial throttle
 
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