quicksilver_rx7

I'm posting this to try to learn some and get some ideas.and considering that the stupid search function is not functioning, I wanted to see what the "Sequential Setup" guys think about this.

I was looking on Apexi's website at their turbos. The AX series is their "factory replacement" turbo. They do not show a listing for the RX-7 but they say it's ideal for twin turbo replacement. Here's a couple of quotes from the website:

Now, considering the fact that they do not make an application for the RX-7 (to my knowledge), would it be possible to adapt these turbos to the RX-7 in sequential form.

Sorry if this has been covered. If so, fix the search function

rynberg

No.

PhatManBUD

single turbo

quicksilver_rx7

Okay, would you care to elaborate?

FDNewbie

iTrader: (10)

I used to mess around on the Supraforums for a bit, and I remember there was a thread about this baller who was putting together a VERY fast (read: expensive) Supra. One thing he insisted on was keeping it sequential. So after a lot of research, he finally found a place that would design larger and higher flowing sequential turbos for his Supra. Cost for R&D? $20,000. That's right. That's why NO ONE has ever developed their own replacement sequential twin turbos. Not for the Supra, not for the FD, not even for the Porsche 959. Financially, it's a dead-end. Technically, it's VERY complex. So the best/closest you can get is modifying the internals of the turbos such as Border and Knightsports were doing, and as of late, the new style BNR III's.

EDIT: If you're still VERY interested in pursuing a custom sequential twin turbo setup, try these guys: http://www.turboengineering.com/cust...turbochargers/ TEC makes damn good turbos from what I've heard. They sponsor Demetrious. You can send them the specs you want, and for $65, they'll give you a quote on how much it will cost to develop. Someone a LONG time ago was running upgraded TEC turbos on their FD, but I can't remember who.

oorx7

iTrader: (2)

I beleave they are made to have the same response in single form as a stock twin setup. In other words you can have the simplicity of one turbo with the benifets of having a sequential setup.

rynberg

Haha, um...no. Take a look at the twin GT28R setup from the rx7store for what this would be like: http://www.rx7store.net/index.asp?Pa...ROD&ProdID=885

The only way to maintain the sequential setup is to use the stock turbine housings or design new ones from scratch that work the same way. BNR has gotten around this problem by machining out the housings to make room for Garrett internals.

gcthree

That 'someone' was Wael El Dasher, and his turbos now reside on my car. God knows what he spent to have these built-up, but I bought them from Fritz when he dismemberd Wael's. Since I've bought them, I have yet to get my car running correctly, so I can't really comment on their performance characteristics. I should have it all back together today, and with fingers crossed, incantations read, and candles and incense burned over the motor, maybe this time it will be right. Otherwise, you'll be able to have these turbos on your car when I head for single turbo land. ....say your prayers.

quicksilver_rx7

Prayer said (for you)

gcthree

I'm almost afraid to start the thing up....it's all bolted together, all I have to do is turn the key....

Montego

iTrader: (1)

do it...

Do It
Do It
Do It!
Do It!!
Do It!!!
Do It!!!!
Do It!!!!!
DO IT!!!!!

FDNewbie

iTrader: (10)

W/ $150K in receipts, including $6K for a BRAND NEW engine, I'm sure Wael spent a pretty penny on those twins, and never looked back. I hope your car starts up just fine, and you give those bad boys a spin, and let us know how long it took to peel yourself back outta the seat

KevinK2

the 99 spec FD turbos have the same zero clearance compressors, and will have the same efficiency improvement vs stock .... just not much more hp capacity.

when they say for "twins", they mean parallel like the 300z and stealth.

quicksilver_rx7

That was a given, considering the fact that they didn't say sequential, and there is no application for the RX-7 listed. I wanted to know if they could be fitted to the RX-7 setup somehow

littlemilla3

iTrader: (1)

Just stop thinking about it, it's not going to happen unless you have lots of extra money. Those other cars have very universal turbos with separate turbine housings and universal T3 or T25 turbine inlets unlike the FD which has a shared turbine dump section and different turbine inlets, both of which are unique to the FD and won't work on other cars.

GoodfellaFD3S

iTrader: (213)

I firmly believe that the new BNR 3s run sequentially will give great low end (like a stock FD) with the midrange and top end of a Greddy T-78. If it wasn't such a pain to convert my FD back to sequential I would have by now......

gcthree

Closed my eyes, said one last prayer, turned the key and ..........................
Same old crap! I love this car!.....I hate this car! Runs so rich it'll make your eyes tear....

Don't want to hijack this thread, so I'll post my woeful tale on another thread and give a reward to whoever figures it out.

rynberg

I guess I'll find out very soon....

FDNewbie

iTrader: (10)

Nice! I can't wait to hear more about this

rynberg

I can't wait either, the car's been down 7 weeks now....

FDNewbie

iTrader: (10)

I woulda said you shoulda postponed the teardown until winter like me, but then I rememberd you're pampered in Cali lol. At JGTC, smack dab in the middle of December (rough winter here, snow, sub zero temps), I was rockin a short sleeve t-shirt, enjoyin sun and 70 degree temps!

quicksilver_rx7

I'm looking foward to the ending of this story as well. Keep us posted.

quicksilver_rx7

Dont' worry about it. If you've got some info to share, share it.

gcthree

Okay, you gave me clearance....

the car (35,000 miles) has always run well, good boost pattern, but with my mods (streetport, PFS SMIC & intake, y-pipe, DP, Hi-flow cat, RB cat-back, sequential TEC turbos , supra pump, 1350 cc secondaries, PFC tuned by Kan) it never made the power it should (290 rwhp @ 15psi). Kan suspected a 'restiction' in the intake or exhaust tracts. After exhasting every possibility, we checked the throttle, and it wasn't fully open! I guess that's a restriction, huh?

So, I adjusted the throttle, and installed a new set of MSD wires. Fired it up to experience the newly found hp, and the thing wouldn't boost past 6 psi! So, I had bought Hi Temp Silicone's viton tube kit, and decided to install it, check all the check valves, solenoids, etc. While I was at it, I removed a few items, such as EGR valve and solenoid, AWS, double throttle & solenoid, and throttle body coolant line. Button it back up, fire up the car, and tons of sooty smoke- which I feel is a rich condition.

Here's what I've checked since:
- map sensor - hooked-up an ohm meter and mity vac and noted changing values
- checked all vacuum hose connections
- replaced coils, plugs, and wires (magnecor)
- removed injectors and checked operation out of car
- checked and reset TPS with PFC commander- checked with voltmeter
- replaced EGR valve/solenoid

Start it up and I get rough running accompanied by heavy smoke. I mistakenly started it up without the MAP sensor hooked-up, and it ran exactly the same.

Attached is a photo of the NGK Iridium plugs that were just in the car for about 2-3 minutes of running.

I've flat-out run out of ideas of things to check. Do you think it could be the OMP, and maybe what I think is rich, is actually too much oil? I did replace the oil injector hoses when I did the vac hose job.... I dunno.