any rtek guys here have an upgraded turbo?

i'm very close to picking up a T04B and was wondering if it would be a good idea to use that turbo with my current set-up... Rtek 1.7 720cc secondaries 3" TID 3" DP 2.5" cat back exhaust FD fuel pump. when/if i pick up that turbo, i'll be looking to upgrade the fuel pump to a walbro, upgrade the intercooler, pick up a SAFC, and perhaps upgrade the Rtek to version 1.8 so that i can run larger primaries and slightly even larger secondaries (i understand that when running 550cc primaries and 720cc secondaries, when it hits the max duty cycle, the max power output would barely touch the 290hp range) my goal is to make 290~360rwhp without having to pick up a full stand alone... i know getting a stand alone is the way to go, but for the moment, i'd like to avoid having to buy one (rather spend that money on an FMIC)... so my request is if anyone is running a set-up similar to my "future" plans. and if they could give feedback, i'd appreciate it. i also wouldnt mind you guys sharing your "theories"... thanks

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[edomund]

Check out my mods in my sig on this thread. http://www.rx7club.com/showthread.php?t=582746
I have a BNR T04b and my setup is similar to what you posted only more fuel, timing control, and wideband.

1. You will need more fuel than you posted in your plans. You will likely need a setup like mine to reach your HP goals. Also I would HIGHLY recomend water/alcahol injection, you are in CA like me (shitty 91 octane).

2. Forget the SAFC you dont need it just upgrade to the 2.0 and will be able to control fuel and timing. If you don't tune your Timing you WILL blow up your motor running 300HP on stock timing maps. It's not quite as easy as turn up the boost and fuel and presto 350HP.

3. You need a wideband O2 to monitor AFR's.

Good luck and have fun tuning.
Ed

[jkimbro]

I thought the rtek 1.x would retard the timing 1 degree for every psi above 9....

[edomund]

It does, however the timing map is too aggressive below 9 PSI as well.
If you are running any setup other than a stock turbo with moderate mods I would suggest retarding the timing map all the way down to 2-3PSI where you blend it to the stock map for driveability.

it's been awhile posting here in the Rtek section, but HEY... i'm back!

anyway, i'm posting to get opinions and input on my current set-up for the FC.

so far, i'm somewhat STILL where i stand (as far as mods go), except that i now have a BNR Stage 2. so to refresh my engine "mod list", i've currently got the Rtek 1.7, 720cc secondaries, stock IC, 3" DP, 2.5" catback, FD fuel pump, and BNR stage 2 (turbo has not yet been installed, but will be tomorrow!). and the short block is a JDM S5 on stock ports.

i have no boost controller and don't plan on getting one until i can have better supporting mods (FMIC, better fuel pump, etc.). but, i do intend on running the current set-up for a couple of months.

i haven't got the turbo installed yet and i'm UNCERTAIN of what to expect. my question would have to be: will i be "safe" with the new turbo?

i've also got a narrow-band AFR gauge and SAFC 2 sitting around. and i'm on too tight of a budget to get a wideband, but will definitely get my hands on one when i can afford it...

what i'm curious to know from you all is what should i expect? basically, the car ran just fine with the old stock turbo and as much as i'd love to think it would pull harder with the new turbo, i just have the gut feeling that it's not "that easy" to have such gains... even with a bolt on turbo

all remarks are welcomed

thanks

[boost_its_what_for_dinner]

not to be a jackass...but you will run lean under boost unless you hook up the safc and richen up the fuel map between 2500-redline. i know this because im currently working on a guys 88 t2 withthe exact setup your about to have but he as the old school hks or trust front mount . im not sure what the fd pump is (liters per hour?) if its not atleast 230lph get a 255 walboro. but i would recomend upgrading to the rtek 2.0 or wait til 2.1 comes out, but if you like the driveability of your car now dont put that turbo on yet. you will blow your motor if you try to boost without monitoring with a wideband 02 or atleast have a fuel management.

if you wanna keep in touch with me as i try to make this guys setup work then pm sometime, im waiting on the walboro 255lph to come in and i have the rtek 2.0 in my 87turbo so i can use it on his car and my wideband will be here today.

please take this seriously so you dont jump the gun and damage your motor

right on, i appreciate your concern

well, as far as waiting to install the turbo goes, i actually traded my turbo plus cash for the BNR stage 2, which makes it my ONLY turbo. the only reason i got the turbo was because i felt it was my only chance at a great deal...

so basically, my rtek 1.7, 720cc secondaries, and FD fuel pump won't seem to support the new turbo?

i'll probably send a PM your way as the day progresses... thanks

[boost_its_what_for_dinner]

No problem, bro. Go ahead and install the turbo just stay out of boost.

[gxl90rx7]

http://www.rx7.com/cgi-local/2ndgencalc.cgi

according to that fuel calc, your injectors will reliably support up to about 315hp (~270 hp at the wheels). the bnr stg2 may make more than that at the wheels at only wastegate spring boost.

also, keep in mind, just because you have rtek 1.7 or 1.8 ecu, they do not really support aftermarket turbos. if you think about it, all they do is keep the stock fuel maps by compensating for bigger injectors. even if you have 720cc secondaries, what good are they if the ecu is still using the stock map? no more fuel is getting to your engine than the stock 550s

you really need the 2.0 or some type of fuel control if you are going to run that turbo, and you really need bigger injectors too. at least 1000cc to be safe

[boost_its_what_for_dinner]

read my sig. thats my set up and i have some lean spots still with stage 1 turbo..

[95nracer]

You should be fine with the setup for now. I would just run stock boost pressures until you can get a wideband or get on a dyno and a way to adjust your fuel trim.


For a year I ran on a Rtek 1.5, 720's, HKS AFR, walbro, FPR without any problems.