Now that I think about it, it never felt too good at 1.2 bar. It definately was hitting pretty hard though at .9, 1.0. Im looking forward to getting this straightened out!

 

Yea man im telling you, took me a while and a few setups to realize this also, my car felt SOLID and hit hard at .9-1.0. once i free'd up the exhaust more and so on, it was boosting higher but it felt like it had no life, dont know, weird! Definitely overboosting these little K16's

 

rwm514

I would remove the ECU and take it for a check up. You are overboosting from the wastegate setups most likely, causing a big dip in torque around peak, which means that your knock sensors detected detonation and the ECU pulled timing.

This all goes together with overboost, however if you look at your AFRs at that point, you are going very rich, meaning it has been programmed this way, trying to protect the engine from heat and knock. I think you might have an issue with both hardware and software.

As was said here, stock K16 setups should max. around 1 Bar, anything beyond this puts you at the low efficiency side on these smallish compressors, meaning you generate hot air rather than cfms, the ECU ends up pulling timing and loosing performance...the more you push it the worse it will perform as heat builds up and the ECU will be protecting your engine. Stock K16s will max out at around 500FWHP giove and take on these specific engines, no matter how much you boost.

 

I was told this and found out for myself, that its very true through my various setups and experience! Its crazy what a difference .9 with a hard steady pull is to a overboosting 1.2 or so!

BTW Jean, did you see the other thread where i posted my info, in the 60-130 thread?

 

ILLM3, no I did not! I will check it our right now

 

Don't worry to much. I bet just adjusting the wastegates back is going to do the trick. I would also check for leaky hoses going the the wastegate actuators. One or both could have a small leak. If they don't get the proper signal the wastegates will not open and turbos will never stop trying to boost and will overspin (with possible impeller or bearing damage).

I had the same exact problem when I had my wastegates modified. The old hose had tiny crack in it. It was not visible. When the car boosted, the crack would open up and leak boost. The car was showing seeing steady 1.6 BAR (I have K24s)! I drove it gingerly to the shop and they replaced the hoses. Everything has been great since.

Your computer is doing it's job keeping knock, detonation and fuel ratios in check. I would't think it's not the ECU at all.

Keep us posted.

 

I will!
Thx for all the input on this, if I hadnt posted my dynos here I would have just thought everything was fine. I wonder if this has anything to do with all my blown MAF's??

 

I know Jimmy at The Shop, he is a friend of mine. I will ask him Monday.

 

Thx Todd. Ill email you. Thx rob

 

If you look at the AFR chart, it runs rather rich at around 4200rpm which produces a dip in the torque curve as well.

 

I agree with the AFRs going too rich, this is what I was saying above, however I would point that what is dipping the torque is detonation, knock sensing and therefore timing retardation by the ECU as a result..

The AFRs seem to have been set this rich at peak torque to help the engine from detonating, but it is way too much, the program needs to be rechecked, the turbos are stretched IMO.

 

Do you have a VFlow? Are you using a 986 or 996 MAF?

 

VFlow and a 996 MAF

 

the dynapack printout states flywheel, but it is likely as measured at the hubs. (every dnyapack print i have shows he same, too; i think it is a default of the software/viewer)

def. looks like timing is being supressed in your "humps"

 

Last time we saw a dyno graph like this heads rolled.
It sounds like you have it worked out.
why doesnt RUF and Protomotive "play around with the
wastegates"? It sounds like Todd at EVOMS feels the wastegates
thing has screwed it up also. I say leave the wastegates alone.
(the stock ones). Good luck with this car it sounds like a great set-up
and I believe 500 HP at the crank would be pretty accurate.
Marty