orginal yaris 2005 1,5 turbo 150hk

[CASTREX]

Originally Posted by mrloseth

Do you know off any one else that have removed the cat`s and put on 2,25" exhaust on the turbo yaris?

the other one i know have the same car and map as me and he have removed the biggest cat an 2,25" exhaust, and open filter, and open bov, and he have 1,0-1,2 bar off boost..:) i dont know why is car do last this:P


so my teori was that if i build the exhaust but i remove all the cat`s, and run stock boost i think that the only diffrence i would feel is more power, and the only danger i think is that i would get an faster spool up on the turbo, but i hope that this wouldnt be any problem?! do you know if the others you know did get faster spool up? bacause the tunning firm said that it was the faster spool ut that could be the problem.because maybe the map wouldnt give enought fuel if the boost started earlier.. good teori?

i dont dont thik that its any problem to run stock boost and exhaust..:


The problem with the open blow off valve is that in some occasions the car will go too rich and stall... mostly because you are releasing air that was already measured by your MAF.
This is usually not much of a problem... i know of 2 yaris running with vented BOV's with no problem.

i did have bov on the engine before the engine did blow up, but now i dont have any, but i dont think that it would be any problem to put it on again?

I know of 2 Yaris here running catless and 2.25 and 2.5 exhausts with the stock map with no problem.
The spool up will improve... but is not that much!! These cars are lagless from the box. So I would not be worried about that.

And the BOV should not be a problem either..

[mrloseth]

Originally Posted by CASTREX

I know of 2 Yaris here running catless and 2.25 and 2.5 exhausts with the stock map with no problem.
The spool up will improve... but is not that much!! These cars are lagless from the box. So I would not be worried about that.

And the BOV should not be a problem either..

thank you for all the info:)



i think that i will build the exhaust and put on the bov, and leave the stock boost att 0,5 bar, because then the car woul last longer i think:):) the new engine wouks good so far:)

[mrloseth]

hello castrex, i got one question for you if you know, the do you know if the first muffler after the turbo is an catlysator? or just an filter ?
i im just wondering if there is any help to remove it.

[CASTREX]

Originally Posted by mrloseth

hello castrex, i got one question for you if you know, the do you know if the first muffler after the turbo is an catlysator? or just an filter ?
i im just wondering if there is any help to remove it.

Yes, that is a cat.

If you don't need to take the gar for inspection you can remove it. It's usually ilegal in many places. Not sure in your country.

You can probbaly gain a couple extra HP taking the cat out. You can also replace it with a high flow race cat.

[mrloseth]

Originally Posted by CASTREX

Yes, that is a cat.

If you don't need to take the gar for inspection you can remove it. It's usually ilegal in many places. Not sure in your country.

You can probbaly gain a couple extra HP taking the cat out. You can also replace it with a high flow race cat.

okey, i was thinking off removing the cat number two att first,:) i did install an aem wideband yesturday, and att full throttle att 3-4 gear the messure was 10,0 att 4500-6200rpm the aem doesent messure lower:/ so i think i have enought fuel, , i have stock boost and stock exhaust now.

[mrloseth]

yesturday i did messure my wideband..the results: started att 1500rpm on 5gear messurements: 1700rpm 13,0....1900rpm 13,3....2300rpm 13,4....2500rpm 13,7...... 2700rpm 13,9..... 2800rpm.14,0....3000rpm-13,5...3200rpm 12,0... 3500rpm 11.8.... 3800rpm-10.7...4000-6200 rpm 10,0

castrex : what do think? this messure are with stock boost.
i think maybe it a bit lean att 2800 rpm?
what would hapen if i bouild exhaust?

im going to do an new messure today and see if i do get the same

[CASTREX]

Originally Posted by mrloseth

yesturday i did messure my wideband..the results: started att 1500rpm on 5gear messurements: 1700rpm 13,0....1900rpm 13,3....2300rpm 13,4....2500rpm 13,7...... 2700rpm 13,9..... 2800rpm.14,0....3000rpm-13,5...3200rpm 12,0... 3500rpm 11.8.... 3800rpm-10.7...4000-6200 rpm 10,0

castrex : what do think? this messure are with stock boost.
i think maybe it a bit lean att 2800 rpm?
what would hapen if i bouild exhaust?

im going to do an new messure today and see if i do get the same

These numbers don't tell much unless you can add the boost figures also. It does a bit lean at 2800 as you said if you are indeed boosting at that RPMS.

It does also look quite rich at the top end... if you could lean that out you will gain some power up top.

How many psi are you seeing at 2500/2800 rpm?

Overall it doesn't look bad. You have enough fuel obviously. Some fine tuning would help. Why don't you try getting a SAFC or a greddy emange? You should be fine if you build a full exhaust.