Hey everyone, I recently had my FD converted into a non-sequential, but was very dissatisfied with the results. Rather than my turbos spooling around 3500 like I was told, they don't start until about 4500, and it takes about 1/8 of a second for them to spool. Uneducated in FDs, my belief is that perhaps the computer needed to be retuned( I know my stock rear turbo kicked in at 4500 before), and maybe thats why it won't spool, because I am getting 0psi at 4300 and 11psi at 4500. PLEASE HELP if you have ANY info, this low end loss is killing me!!!

 

You need midpipe to free up the flow to reduce the lag. Which requires upgraded ecu.

 

The part I'm confused about is how the boost kicks in instantly, as if all of a sudden the computer told the car to let the turbos start now(if thats how its works, like I said, uneducated). I realize my lag is due to lack of exhaust flow, but I'd really like to know why the power is so sudden.

 

Basically this is how sequential works:
(1) from 0 to about 4000 rpm, the #1 turbo gets all of the exhaust so it spools instantly.
(2) around 4000 rpm the #2 turbo get s little exhaust to prespool.
(3) around 4500 rpm both turbo share all the exhaust for full power.

I complete well done non-seq conversion with a DP and MP would impress you unless you have an automatic transmission mentallity which many on this forum have.

 

I have a non-sequential, I just don't know if its "well done"

 

you have something wrong...as NS should not spool instantly and you should have boost below 4500. NS is a very linear curve.

who did the conversion?

 

T&R Racing, in Queens, NY. www.RX7s.com like I said I'm VERY disappointed with this setup

 

My goal was to sacrifice the unneccesary low-end power for mid power, and all it seems like I did was remove the smaller turbo

 

When you do a non-seq conversion, part of it should be:
(1) port the wastegate.
(2) remove the turbo control actuator, it's exhaust control valve in the exhaust manifold, plug the gates control arm hole in the exhaust manifold, and round off the edges of the #2 rotor exhaust port in the turbo housing.
(3) weld the pre-control gate open.
(4) and a few other removeal of parts.

This all requires removing the turbo assemble and the exhaust manifold, and taking the turbos apart.

If this was not done, then you have a poor mans non-seq which is not a non-seq conversion in my book.

 

interesting...they didn't say they did any of this...damn I must have a poor mans NS, but I told them do it correctly, price wasn't an issue on qualtiy of work, I just wanted it done right...I'll be making a call later, thanks so much for the info...