Power dip
 

Hi everyone,

Iv just been looking at my dyno graph and am a little confused, there is a little dip at high rpm and then just before redline the power shoots up. the car has a 5th injector that is activated only at certain times and I think it is otherwise using stock injectors through a piggyback ECU. I was thinking that maybe the injectors can't cope and that's the reason for the dip and that the spike is from the 5th injector, please let me know what you think

Attachment 18589

https://www.miataturbo.net/attachmen...1&d=1287066169

what setup is this?

boost is incredibly slow. do you have a boost gauge? are you making more boost at 6500?

A t3/t4 hybrid turbonetics turbo was used along with an evolution external wastegate, BOV, front mounted intercooler and all the usual plumbing, boost controller and engine management system, full stainless steel exhaust and centerforce clutch. At the moment the engine has done 30 000km after the turbo conversion and rebuild and is running at 0.9bar. It is the 1.6 by the way. The turbo seems to have a 58.2mm/75mm wheel in a .63 turbine housing.

could have run the overboost on this dyno run though which puts it at 1.1bar at a certain point

oh this setup. yeah. that's fail.

correction with this sorry, overboost was set after 6500rpm and was 0.9 measured pre intercooler. so i am guessing that normal boost was about 0.7??

i mean i'd only like those numbers if you were running .4bar.

there's something majorly wrong with something.