my turbo n/a project is done and i have had lots of problems at the dyno.
ok i have been to the dyno twice and both times the Afc has worked backwards. the wiering is all in line so i dont know what the deal is there but to day we started to tune and for some reason it would not hold boost. so may be there is a boost leak some where in the system or the boost controler is bad or the wastgate is opening. what is the stock spring in that wastegate? the car would make boost to about 4.2 psi and then at 5 thousand rpms it would dye off completly. any input would be a great help. every thing is S5 including the turbo.

 

i doubt it is a wastegate issue, it sounds like a massive leak in the intake plumbing.

what exactly is the SAFC doing backwards? adding + it leans the engine out? if that is the case then the settings for the SAFC are incorrect.

 

how are the setting wrong i diid every thing to the book. does any one know what the stock wastegate spring is? i pinched the W/G hoes to the boost controler and it boosted over 4 psi after that it never went over that before.

 

the stock S5 spring is rated at 6.5psi iirc, if you are boosting any lower than that then you have a problem for sure.

if your settings are working backwards then your AFM settings in the SAFC are inccorrect, if you did it by the book or not.

 

this is a stupied question but what AFM settings are you talking about?

 

taken from 1300cc.com How to's

Settings:

4 cyl. arrow up to the right.



Flap type sensor.



(86-88 Use 05in and 05 out!)

89-92 use 06 in and 06 out

 

that is exactly how i have it set.

 

are you sure the wiring is not backwards then? repeating what i said earlier,how is it reacting backwards?(leaning out when you turn the dial clockwise?)

 

I've heard of the safc being *** backwards like that on more than one occation. Do a search for it and see if you find out what the other people did. Mine worked fine when I had it so when I would do searches and see that I would just kinda skip over it but it has deffinatley happend more than once and has been covered on this site.

 

i had it happen on a nissan but it was due to the settings for the MAF since he had a Z32 MAF in conjunction with a KA24T(turbo).

 

how did you like the ka24t? I have a buddy of mine that is almost done with his and I'm wondering how its going to turn out! The torque on that bad boy is going to be crazy

 

i'm not sure, i only helped do some minor tuning though it still has some issues. i personally did not like the manifold design(2 exhaust port runners facing the other 2 then a 90 degree out the exhaust seemed inefficient) i didn't drive it and he was rather babying it until we got to cruise and did some 4th gear pulls and the wideband was giving me some irregular readings so i told him to repair a few issues and we will try again. i guess time will tell how well it will be, til then he needs to do some more work on it, it doesn't seem like an easy setup to me because the Z32 MAF was fighting us as well the a/f readings but i did not do the install so i can't comment on whether it is setup correctly or not.

my engine now is torquey enough for me, it has good low and and good turbo and throttle response. i hardly work on anything other than 7s so it is hard to compare unless vs a V8 and there is no comparison between the 2 power curves then.

 

ok the afc is stright now but still the boost dies at 6 thousand RPMs. there is plunty of fuel its like the redline is set at six grand its very strange. anyone know why it would do this?

 

If the S-AFC is exactly backwards, it is set to Hot-Wire and not Flapper.

If your boost is dying at 6K, then you have a restriction in your intake/exhaust.

 

it seems like it has something to to with the electronicts because it dies right around 6000 rpms at any boost. i did put in a new larger muffler, wounder if that would do it? but i love how the car sounds with it, nice and slient.