Hey guys

Ive got a aus spec car and it seems we got ripped off and got no map sensor (no egr either). We are running into a lot of issues tuning my car as well as a few friends who have near identical setups.

My car has a built 2.0l, removed balance shafts but it seems to be a very quiet motor,
cosworth m2 cams, 720cc denso injectors and a trust t67 kit.

Now on the dyno tuning, we floor it from 2000rpm in 4th gear (we normally tune in 4th here). the afr curve from 2000-4000rpm is literally a rollercoaster, from 16 to 10 to 16 afr which is causing spool up knock. No matter what we do with the fuel map, the afrs arent being corrected. the rollercoaster stays no matter what!

It took a while to get the injectors scaled in but it seems like they are alright (fuel trims look almost spot on).

What we are trying to figure out is, are the problems in tuning due to the car having no map sensor and having difficulty with the amount of airflow, or have we overlooked something else in tuning?

It there some hidden setting that we need to change to account for the bigger turbo? We have rescaled the load already. Do we need a map sensor to be wired in for this amount of airflow?

Hopefully someone can shed some light on this!

thanks
George

 

having a MAP sensor on our cars will not actually do anything, not unless you write a speed density patch and remove the MAF.

I don't really see why your car can't be tuned properly.

lets start at the beginning, what air intake u got? what injectors?

got a log of the swinging AFR?

post up your fuel map...

 

air intake: trust in a hks kansai box
injectors: denso/trust 720cc

dont have a log because its on my mates computer, will have to try and find that tomorrow.

heres my fuel map

 

u got lean spool enabled or disabled?

are your loads up and down a lot?

 

lean spool disabled

will have to check the loads when i get the log

 

Have you tried forcing open loop earlier so you can dial in the AFRs with the map?