Elite 2500 Sequential turbo operation
 

Haltech offers a plug and play patch harness specifically for the Elite 2500 for S7 and S8 FD3S that allows control of the sequential turbo operation. Has anyone actually used this?

We ordered and installed this but the turbo control isn't working very well (all or nothing), and Haltech was not very useful on the phone as it seemed we were the only ones trying to control 99 spec turbos.

We were also having an issue with the Primary and secondary injectors transitioning between them. The software was indicating a nice blend but in reality it would go lean then pig rich no matter what we tried with ID1000 primaries and ID2000 secondaries. We've used this combo successfully on dozens of other RX7's but this is the first Elite rotary we've done.

Anyone have a similar setup?

It sounds like there is a staging enrichment feature that is probably setup incorrectly.

Wouldn't the Haltech Elite PnP for the S7 & S8 not work with a S6 car since the Japanese turbo control vacuum box is different from the US spec individual turbo solenoids, thus have a different wiring harness to control the sequential twins?

I only ask because I plan on going Haltech Elite 2500 (Universal) to control my sequential BNRs with a Boomslang PnP harness. I have a new OEM harness with emissions depinned and the AZKnightz solenoids for turbo control.

I was under the impression too that any Elite 2500 can run sequential twins and not just the S7 & S8 PnP model. The only difference is the PnP specific patch harness.

We've tuned numerous RX7's even on Sport ECU's without issue. In the end even Haltech couldn't sort the problem out when remotely controlling our computer on the dyno. We reinstalled the APEXi and it was no problem.

This was a S7 car with the S7 PnP harness.

In the basemap we found some errors with the sequential turbo control that we fixed and it made an improvement but still wasn't awesome. We never had this issue on the 93-96 cars but on these 99's if the first turbo didn't hit 10psi it wouldn't allow the 2nd turbo to switch over at all and the car behaved very strangely. Same problem with the PowerFC as well, but if we allowed the first turbo to hit 10+psi then the 2nd would come on consistently.

My sequential twins worked perfect on my PFC, but I've thrown enough money in this car that I want to protect the engine with a better ECU. Sounds like that car is having transition and boost control issues if the PFC was sketchy too (unless I misunderstood your explanation).

Sounds like a bad check valve or solenoid.