Project STi Time Attack
06 June 2007, 02:51 PM
#1
Project STi Time Attack
I thought I would start a new project thread for my car to help me to prepare the car ready for Time Attack at the end of July up at Knockhill. If all goes to plan it should be almost ready for shakedown at Cadwell Park on the 16th July.
Issues:
1. Injector duty too high running at 95+% IDC at the moment even with 3.8 bar fuel pressure
2. Air restrictions caused by airbox
3. Oil throw issue on prolonged cornering causing catch can to fill within a few laps
4. Suspension needs to be lowered and reduction of body roll and allowing greater cornering speeds
5. Tyres ... I need some
6. Brakes
7. TA Specifics
Plan of Attack:
1. 800cc injectors are ready to be fitted along with adjustments to the mapping to suit and small increase of boost as we had to back it off to keep within 100% IDC. This should liberate the top end a little more where duty cycle issues really get highlighted. This will extend the available power range upwards slightly giving the option to hold a shorter gear through a section rather than short shifting prior to a corner.
Power-wise I would expect another 15-20 bhp from this in the peak region but more importantly give me IDC of 80% as a max.
2. APS 70mm inner-wing mounted induction kit arrives tomorrow and will get fitted before the injectors as it will be easier to adjust the MAF scaling first to suit this and then factor in higher flow injectors than the other way around. Aside from an increase in induction noise (which I personally dont like much) it will make the whole induction system flow better and should increase both torque and bhp figures a tad once mapped to suit
3. The Oil Throw issue needs solving as I do not want to be depositing oil onto the track for other competitiors or for me to have a moment on. I have decided to go the whole hog this time and fit a 3 x inlet, 1 x breather and 1 drain 2.6 litre catch can from Roger Clark Motorsport. This will be aeroquipped to drain back any collected oil to the sump, thereby keeping the oil within the engine and not sprayed underneath my car Whereas 2.6 litres does seem excessively large, I am fed up with having to drain the catch can after half a dozen spirited laps.
The catch can does not catch hardly anything during normal road use even at high boost so can 100% be solved by this solution.
This is a photo of Bob Rawle's solution that I will be putting in place (although i will be using a banjo bolt rather than a straight feed):
4. Suspension - This is strangely a lower priority than the others but as my existing suspension seems to work ok enough as it stands, it would be great to make it better but not 100% essential if funds are limited. Shortlist at the moment is: EXE-TC and KW Variant 3.
5. Tyres - looking for a small supply of R rated, probably Yoko 048's 235/45/17 for my spare wheels (sponsors would be greatly appreciated on these
)
6. Brakes - not really an issue now with the PF discs and pads but will be removing the backing plates and fitting cooling ducts to ensure that they stay as good as they can be.
7. TA specifics - I will need to go through the regs to ensure that the car will pass scrutineering.... be a bloody long way to go only to be turned away for a stupid thing
The end power result should be in the order of:
380 bhp
420 lb/ft
Not huge figures by the levels of some here, but with torque of over 350 lb/ft from 2800 to 5500rpm it should be pretty rapid around the track
Issues:
1. Injector duty too high running at 95+% IDC at the moment even with 3.8 bar fuel pressure
2. Air restrictions caused by airbox
3. Oil throw issue on prolonged cornering causing catch can to fill within a few laps
4. Suspension needs to be lowered and reduction of body roll and allowing greater cornering speeds
5. Tyres ... I need some
6. Brakes
7. TA Specifics
Plan of Attack:
1. 800cc injectors are ready to be fitted along with adjustments to the mapping to suit and small increase of boost as we had to back it off to keep within 100% IDC. This should liberate the top end a little more where duty cycle issues really get highlighted. This will extend the available power range upwards slightly giving the option to hold a shorter gear through a section rather than short shifting prior to a corner.
Power-wise I would expect another 15-20 bhp from this in the peak region but more importantly give me IDC of 80% as a max.
2. APS 70mm inner-wing mounted induction kit arrives tomorrow and will get fitted before the injectors as it will be easier to adjust the MAF scaling first to suit this and then factor in higher flow injectors than the other way around. Aside from an increase in induction noise (which I personally dont like much) it will make the whole induction system flow better and should increase both torque and bhp figures a tad once mapped to suit
3. The Oil Throw issue needs solving as I do not want to be depositing oil onto the track for other competitiors or for me to have a moment on. I have decided to go the whole hog this time and fit a 3 x inlet, 1 x breather and 1 drain 2.6 litre catch can from Roger Clark Motorsport. This will be aeroquipped to drain back any collected oil to the sump, thereby keeping the oil within the engine and not sprayed underneath my car
Whereas 2.6 litres does seem excessively large, I am fed up with having to drain the catch can after half a dozen spirited laps.The catch can does not catch hardly anything during normal road use even at high boost so can 100% be solved by this solution.
This is a photo of Bob Rawle's solution that I will be putting in place (although i will be using a banjo bolt rather than a straight feed):
4. Suspension - This is strangely a lower priority than the others but as my existing suspension seems to work ok enough as it stands, it would be great to make it better but not 100% essential if funds are limited. Shortlist at the moment is: EXE-TC and KW Variant 3.
5. Tyres - looking for a small supply of R rated, probably Yoko 048's 235/45/17 for my spare wheels (sponsors would be greatly appreciated on these
)6. Brakes - not really an issue now with the PF discs and pads but will be removing the backing plates and fitting cooling ducts to ensure that they stay as good as they can be.
7. TA specifics - I will need to go through the regs to ensure that the car will pass scrutineering.... be a bloody long way to go only to be turned away for a stupid thing
The end power result should be in the order of:
380 bhp
420 lb/ft
Not huge figures by the levels of some here, but with torque of over 350 lb/ft from 2800 to 5500rpm it should be pretty rapid around the track
06 June 2007, 06:26 PM
#3
Hi Graham
Nope sorry should have said: 2.5 STi 2006
The oil throw issue has had me vexxed for a while as shown on 22b.com but going to get it solved now once and for all thanks to great input from the massive knowledge base of guys there.
This is the car:
Latest Dyno Sheet:
(i am not wanting a debate on the validity or whatever or dyno sheets means jack diddly ... so save that for someone else .... just posting to give background for the project )
Nope sorry should have said: 2.5 STi 2006
The oil throw issue has had me vexxed for a while as shown on 22b.com but going to get it solved now once and for all thanks to great input from the massive knowledge base of guys there.
This is the car:
Latest Dyno Sheet:
(i am not wanting a debate on the validity or whatever or dyno sheets means jack diddly ... so save that for someone else .... just posting to give background for the project
)
08 June 2007, 01:29 PM
#7
Tyres
I am trying to make a decision on the tyres to use at the moment. Choice is:
Toyo R888
or
Yokohama A048R
Cost wise the Yokohama work out at about £50 a tyre cheaper
Anyone have any views as to comparability between the R888 and medium compound 48's?
Toyo R888
or
Yokohama A048R
Cost wise the Yokohama work out at about £50 a tyre cheaper
Anyone have any views as to comparability between the R888 and medium compound 48's?
Trending Topics
08 June 2007, 07:12 PM
#8
The sump pipe is the issue i think.
Mine doesn't have one and the catch tank has 5 mm of oil in it after 3 years, and the FMIC/pipes are perfectly dry.
Tyres?
Bloody minefield!
Graham.
Mine doesn't have one and the catch tank has 5 mm of oil in it after 3 years, and the FMIC/pipes are perfectly dry.
Tyres?
Bloody minefield!
Graham.
08 June 2007, 08:20 PM
#10
List 1B?
No question, the fab Kumho V70/700's.
Soft compound if you can (only on 16''/15'') or medium on 17''.
They are insane in the dry and damp. Pouring rain?
Any old List 1A but the Marigoni Linea seem superb to me.
In the dry then the AVON slicks are Kind.
If you can run 1B then personally I would run Kumho.
(bit pricey now though)
Graham.
No question, the fab Kumho V70/700's.
Soft compound if you can (only on 16''/15'') or medium on 17''.
They are insane in the dry and damp. Pouring rain?
Any old List 1A but the Marigoni Linea seem superb to me.
In the dry then the AVON slicks are Kind.
If you can run 1B then personally I would run Kumho.
(bit pricey now though)
Graham.
09 June 2007, 02:26 PM
#11
more power captain
Date fixed for fitting of the injectors and APS kit - 28th June
Mapping will also be done to optimise the boost across the board.
Will also be getting two sets of maps done:
1) V-power for normal running
2) V-power plus CVL Turbo octane Booster (total of 103 octane) for fun stuff
Now that I have the necessary hardware I will be able to swap to the fun map for track days etc and swap back for times where I dont want to stick an extra £10 in the tank
We should be able to run a chunk more advance on the 103 octane and get a significant increase in power/torque ..... or thats the plan anyway
Mapping will also be done to optimise the boost across the board.
Will also be getting two sets of maps done:
1) V-power for normal running
2) V-power plus CVL Turbo octane Booster (total of 103 octane) for fun stuff
Now that I have the necessary hardware I will be able to swap to the fun map for track days etc and swap back for times where I dont want to stick an extra £10 in the tank
We should be able to run a chunk more advance on the 103 octane and get a significant increase in power/torque ..... or thats the plan anyway
10 June 2007, 12:03 AM
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10 June 2007, 03:19 PM
#17
Nice .... saw Terryb's results from the racefuel mapping - thought it had to be worth it. Rather than just using octane boost for the sake of it, getting the map changed to suit but allowing for a degree of margin for track temps.
Obviously I could change the static advance across, but I am guessing that this would:
a) be dangerous as it may not be a case that an extra x degrees advance could be run across the whole range
b) doing without det detection would be difficult
c) assuming that the std ECU will pull back timing enough If too much was added is a little too risky (ie very risky )
Obviously I could change the static advance across, but I am guessing that this would:
a) be dangerous as it may not be a case that an extra x degrees advance could be run across the whole range
b) doing without det detection would be difficult
c) assuming that the std ECU will pull back timing enough If too much was added is a little too risky (ie very risky
)
10 June 2007, 04:25 PM
#18
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Consider having a map with a 10-12% methanol mix.
It gives very good results, and is cheaper than any of the other octane boosters.
Mark.
It gives very good results, and is cheaper than any of the other octane boosters.
Mark.
10 June 2007, 04:42 PM
#19
Hi Mark
I have looked at that but I am not sure that I am allowed to run that mixture up at TA. Thought that the octane booster was less hassle (albeit expensive)
The next major step beyond these mods is:
MD321 in either H or T varieties
(oh and pistons - forged flavour)
Have any H's been fitted to 2.5's yet? - would love to see some results
I have looked at that but I am not sure that I am allowed to run that mixture up at TA. Thought that the octane booster was less hassle (albeit expensive)
The next major step beyond these mods is:
MD321 in either H or T varieties
(oh and pistons - forged flavour)
Have any H's been fitted to 2.5's yet? - would love to see some results
Last edited by dynamix; 10 June 2007 at 04:44 PM.
10 June 2007, 06:12 PM
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