gd day
Is there any benefit in using for the EXIGE S a direct induction kit ITG - Daytona or other instead of the standard air box ?
Do we have some Dyno sheet or experience from some ‘S’ owners ?
thanks for your help and comments !
philipp
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They sound great !!! but I fear very little if any improvement in performance. When I first got mine I did feel there was a slight improvemnt in mid range torque but I think the stats don’t show this.
Ex77
hi
Which one did you put on your car ?
thanks
philippe
the ECU cannot cope with the extra air on the S cars
and even on some NA cars there has been a problem.
but most NA cars do work with ITG.
Yeah I think the std injectors are on the limit for the S and any further airflow just makes it start to lean out…
I’ve got the Pipercross and a stage 1 Zaust. They sound good.
Stage 2 was a bit too boomy.
Ex77
Its not a good idea on the S to replace the airbox, the tuning done for the MAF is quite exact changing the shape therefore the airflow through the MAF makes the car run lean and play around.
You can improve the airflow without changing the flow charactaristics by using a higher flow filter and enlarging the entry hole into the airbox by removing the very restrictive snorkel and putting in some ducting directly to the side scoop.
I made quite a bit of mid range torque and some top end bhp by doing this. If you do this work don’t cry to me if you have issues, I’m just saying what has worked for me and has given no running problems or leaning so far.
the ECU cannot cope with the extra air on the S cars
and even on some NA cars there has been a problem.
but most NA cars do work with ITG.
How about cars with a CUP ECU?
Nico
i think the 2007 cup car uses a much larger Toyota sourced airbox and filter.see this thread on a U.S. Cup 255…
All things considerd i would think this would be a better direction than the aftermarket.
Its not a good idea on the S to replace the airbox, the tuning done for the MAF is quite exact changing the shape therefore the airflow through the MAF makes the car run lean and play around.
You can improve the airflow without changing the flow charactaristics by using a higher flow filter and enlarging the entry hole into the airbox by removing the very restrictive snorkel and putting in some ducting directly to the side scoop.
I made quite a bit of mid range torque and some top end bhp by doing this. If you do this work don’t cry to me if you have issues, I’m just saying what has worked for me and has given no running problems or leaning so far.
can you post your dyno sheets showing your gains ?
Will do as soon as I can get to a scanner…
hi,
It will be helpfull to post your Dyno!thanks.
re. 255 cup airbox ! It looks much bigger indeed, but the injectors might give a bigger flow as well ! So maybe not
appropriate for the S version ?
Re. direct induction kit : Did anybody tried it on a Dyno ?
The ECU might learn the increase of air and flow the fuel
accordingly (there is no bigger boost as it is mecanical).
so how can it be lean ?
Philippe
hi,
It will be helpfull to post your Dyno!thanks.
re. 255 cup airbox ! It looks much bigger indeed, but the injectors might give a bigger flow as well ! So maybe not
appropriate for the S version ?Re. direct induction kit : Did anybody tried it on a Dyno ?
The ECU might learn the increase of air and flow the fuel
accordingly (there is no bigger boost as it is mecanical).so how can it be lean ?
Philippe
The issue with the ECU are being taken a little out of context if you ask me and I dont think the Lotus ECU is particularly unusual.
The ECU normally runs to a given fuel map and compares this with the airflow on the day. It will make adaptions to the base fuel map so that the ECU maintains what it thinks is the correct AFR. When the air filter is changed and the car run up again it runs the base fuel map + any adaptions it has come to learn - but it wont have learnt the new ones yet so the first few times it will run slightly leanER than before (but not lean outright).
At high engine speed the ECU delibeartely overfuels to protect the exhaust valves/ports and cat from over temping. This overfuelling loses outright power. When you lean out the AFR due to the modifications you see this power increase but the ECU has to adjust to protect the engine. It wont do this in one hit as it could be a glitch so it just moves a little bit and then a bit more next time.
Overall you should see a small increase in power, just not as much as the initial step. The ECU is not deliberately trying to stick to the std power output.
Hi Bob,
Very interesting comments indeed !
So if i follow your explanation, when we put a direct induction kit such as Daytona or ITG, the ECU will slowly
learn the airflow increase and adjust the fuel (it might be lean only at begining).
But as a final result the power increase will be effective !
because more air and more fuel !
Is that right ? or am i missing something ?
philippe
you will still get no power increase 
you might even lose some
I cant imagine the basic Lotus air filter and exhaust are that bad in the first place. There’s always the outside chance that the aftermarket bits could be worse. Also, the MAF meter body needs to be replaced when you junk the airbox and we all know that you get MAF errors so it could be just that it sends the wrong signals?
what about putting the cup255 airbox and filter on?..from the elietalk thread they seem to reckon its a tuning part (TRD) from a V6 Toyota.
Is the std map likely to be able to cope? It would the semm the MAF would remain the same.
As its a validated TRD part then I’d hazard a guess that it would work.
To keep the MAFs sending the correct signal you have to keep the vanes in the MAFs housing. Just go on spyderchat and buy a new MAF housing from a guy there going by the name Corky. Problem resolved
If you have an aftermarket ECU you can tune around the problem and remove the MAFs vanes since they are a restriction.
the maf characterisation may be different betwen the Toyota and the Lotus ECU so I wouldn’t say for sure that any mods which work on the Spyder would neceasrily carry across to the Exige.