funklove

Hi!
My team have placed 20B into RX8.
It was an interesting task.
We have not many rotary tuners in Russia especially with 20B.

We have done the mechanical and a lot of electrical work.
I need to tune. Engine starts perfectly, idling with BAC, revs with hesitation.
My mechanic have welded Greddy EGT probe into exhaust manifold right before turbo flange where 3 pipes connects. I know its a wrong place.
I revs motor up to 5K with 14-14.7 AFR, 20-30 degree of advance, 10-15 split, no load.
EGT is crazy high! Up to 900C and keep grows! Engine is very hot!
Im scared to blow a motor!
This probe and gauge was into the same car with Renesis Greddy Turbo kit and did not read above 850C even under load.
Im so curious. What EGTs is normal?

Specs:
20B street porting
GT42 Turbo with custom exhaust manifold
Haltech P2000 ECU
850/1600CC
CDI Ignition
Standard plugs
3" downpipe
Catalytic converter

t-von

iTrader: (8)

20b or not, EGT's generally go higher the leaner the mixture. If your mixture is stotch (14.7) with little to no load, your not gonna blow the engine just by reving it or even at light cruising. These engines would never pass an emission test if you can't run them at stotch under light loads. If you probe any stock rotary engine, you'll probably notice the same thing under those same conditions. Just make sure you have the egt's and A/F in range under load and boost. If your really concerned about the temps, you can run negative split in the very low loads ranges of your map with your Haltech. That will lower the exhaust temp while making the engine a little bit quieter and give better fuel economy. Negative split will also give you better emssions with you running a catalyic converter.

funklove

Thank you very much, T-von!
I had glow a turbo and a manifold in my cosmo. But did not mention it because I have no EGT probe.

felix_is_alive

you might want to check the exhaust , ive had a similar problem with high egt`s running 3 inch
i swapped to a 4 inch and my egts dropped immediately