some tests with bad results ¡¡

[Rocco]

Hi friends, yesterday night i was trying in a "closed night roads" my current setup with k26/27 turbo + RS2 injectors +7A FPR with my old 3B to RS2 step software with Motronic 300kpa.

Ok... i know they are different turbos,but not so much¡ and i wanted to try how could work with the RS2 software...

the results were leaner AFR values like (12-12.5) boosting less than before with RS2 turbo. with RS2 turbo and this software i made 1.8bar in 3rd gear and 2.0bar in 5th gear¡ and now with the k26/27 only can load 1.6bar in 4th or 5th gear dont know why... of course i am not an expert.

anyway the car ran "a lot" ...BUT after insert 2nd,3rd gears in WOT in 4th or 5th gears i´ve lost ALL THE BOOST¡¡¡

imagine the situation...... WOT in the larguer gears...and after 3 or 4 seconds in WOT all the power it is gone¡¡ ,for example....i was boosting 1.6barand lossing few pressure while the time runs...and after 3 or 4 seconds the boost turn back to 0bar¡¡

WHY?? what can be??

it seems like the Motronic order to take off the boost.... maybe because the software parameters are not the wish for it.....because the turbo it is a little bigger than the RS2 one......

missfiring or knock detection could be?? my knock sensors are new with less than 2000kms too..so they works surelly perfect

does someone had a similar experience?? i am only a little worry for it...but it was a try

[vertigone]

Hi mate !
no boost at all is strange, it would put it in "limp mode" with only WG boost
never had this , I want to know the answer too

[GazzaG60]

no boost.

boost hose off.

holes in pistons.

failed turbo.

[GazzaG60]

do a compression test.

dont just try a component and give it death or your asking for trouble.

what were you thinking going wot on all gears on a bigger turbo with the same map?

[Rusty]

You shouldn't just run RS2 software with the wrong turbo, no wonder it's not happy with AFRs. Motronic is a complex beast but it sounds like you have a boost leak, hence the lower boost achieved. ANother thing could be that the larger turbo cannot produce the boost where the ECU is asking for it (so to speak).

[prj]

1. K26/K27 can not boost that much I think... you are overspinning it.
2. You most likely have a boost leak.
3. Fuel chip is fine with running a smaller sized turbo than it is specced for, because it delivers fuel based on the amount of air entering the engine (MAF). If less air enters the engine than it is mapped for at maximum, then usually nothing bad will happen.
4. Boost chip is not fine, because you are overspinning the turbo and your IAT-s are probably much higher than with the RS2 turbo. Because the fuel chip is not tested with so high IAT's at that level of boost, you will most likely experience knocking. Motronic tries to compensate by pulling timing and enrichening the mixture, but the adaptation is not always enough.
5. Stop doing this ****, you /will/ blow your turbo and your engine.

[Jamo]

A k26/k27 can do 2 bar easily

[prj]

A k26/k27 can do 2 bar easily

Alright, in that case something else is wrong.
And it doesn't seem to be a boost leak, else he'd run very rich. Although if the MAF maxes out due to a huge boost leak and the turbo pulling lots of air, then load will start to drop and mixture will lean out.

[Rocco]

boost leak??? i dont believe it ¡¡ because i can load always 1,2bar ,1.4bar or 1.6bar in different gears,and it is just always the same

in the past i had boost leaks whem destroyed 2 original hoses with the high pressure and the symptoms were much different than now,and i could heard the "pssscchhhh" boost leak everytimes under load.

now it is different..... now the car seems to work well,but after 3 seconds in WOT..... I WAS 1.6BAR.....and a second later 0 bar with leaner Mixture

i bet for the problems comes with the different software for different turbo specs,similars,but different anyway

and only happen with 4th and 5 th gear,,never in 2nd or 3rd.... it is extrange ,and always happens too whem i am very near to 5000/6000rpm

[Jonas_R]

If there is no boost at all, then i would think you have blown a hose off.

[Rocco]

no jonas¡¡ of course i have boost¡¡ and the car run a lot, but in 4th or 5th gears after 3 or 4 seconds in WOT.......goodbye boost

[david]

why are you worrying your self rocco,you should forget about this engine and start preparation for your new monster engine

[Rocco]

why are you worrying your self rocco,you should forget about this engine and start preparation for your new monster engine

it was only a try,and i had a doubt about why it is happening this

it is very extrange....

i cant do anything now.... because i am waiting all,,maybe for the end of september.....i have everything mounted and installed and ready to use and travel with it

[prj]

now it is different..... now the car seems to work well,but after 3 seconds in WOT..... I WAS 1.6BAR.....and a second later 0 bar with leaner Mixture

If it is 0 bar and not 0.4 bar + you fly with head against windscreen, then you have fuel cut.

i bet for the problems comes with the different software for different turbo specs,similars,but different anyway

Possibly.

and only happen with 4th and 5 th gear,,never in 2nd or 3rd.... it is extrange ,and always happens too whem i am very near to 5000/6000rpm

Maybe because N75 needs to bleed off more air than it is programmed for and even boost adaptation fails.

Another possibility is that you max out your MAF. On 3B that gets very ugly very fast.

[Rocco]

If it is 0 bar and not 0.4 bar + you fly with head against windscreen, then you have fuel cut.

Possibly.

Maybe because N75 needs to bleed off more air than it is programmed for and even boost adaptation fails.

Another possibility is that you max out your MAF. On 3B that gets very ugly very fast.

yes a fuel cut could be perfectly¡¡ i feel how i lose all the power in one sencond¡¡

and 0.4bar no..never¡¡ it goes always to 0.

my maf seems to be Ok...it is very clean inside too..

and about N75.....i could dissable it,electrically and put a manual valve ,because i got one and test a few.... and then if later can hold the boost the problem should be from N75....