Wild7

First off here's my build

GT35r divided T4 1.06 Single Turbo Kit

Rebuild w/ Street Port

RE-A Dual Tip Dolphin Tail Cat-back

Power FC w/ Commander
Supra TT Fuel Pump
550/1300 Injectors

V-Mount IC
Modified Koyo Radiator

Greddy Elbow w/ BOV Flange
Greddy Type-RS BOV

Slotted or Drilled Rotors


Few questions though...

I spoke w/ my installer some weeks ago and he's saying he wants to go with the stock primaries and 1300 secondaries. Reason being is he says it will be more streetable while still providing enough fuel for my hp goal.

Is 550/1300 enough for 400-425rwhp?

Any suggestions on Batteries? With the V-Mount IC I'm going w/ it's forcing me to relocate the battery. I heard the Odyssey PC680 Battery didn't supply enough reliable power and had to but jumped at times.

I'm also thinking about getting the HKS Twin Power Ignition System. Suggestion for spark plugs?


Thanks in advance

SLOASFK

iTrader: (5)

that should be plenty for your power goals, however I'd reccomend adding a water injection kit to be on the safe side.

I'd also reccomend using your stock secondaries in your primary rail. 850cc primaries are plenty streetable.

Wild7

Hmm.. I haven't looked into that one. It never even came up when the installer and I talked about my build.

bzwigart

iTrader: (9)

I've had the PC680 for a few years now. Over winter and when I don't drive my car often its hooked up to a battery tender. I've had no issues with the battery.

The Driver

iTrader: (4)

Voltphreaks.com

FierceAlien

iTrader: (6)

+1 for voltphreaks. got the 4.5 lb battery and love it. I relocated it of course.

manveru

550s/1300s is what im running and im right at 400whp. havent run out of fuel yet. DO get the twin power. it will do wonders at that power level. as for plugs, i'd say go with 10's all around or maybe 10.5s.

if you ARE looking for a bit more fuel, then SLOASFK is right. it would be super easy to throw the 850s in the primary rail while everything is about. just mill the top down 1/8" and they seat right in.

and any AI system will be a plus to the build. engine that runs colder and cleaner is never a bad thing. it will also be beneficial should you decided for more power down the road. only downside is it's another system you have to monitor...

Renesis07

I wish I had 425 whp haha

PandazRx-7

iTrader: (18)

I would go for more fuel, you'll want it later...I have a similar turbo/engine set-up and 850's are rock solid at idle. Just make sure to adjust the TB throttle linkage and air bleed screw accordingly... I would also suggest a different pump, even though the Supra pump might be fine, it'll be on the edge and you'll eventually want more pump. Why not go for more the first time and not pay for tuning 2 or 3 times...

As for battery, I used a PC680 in the past with bad experience even in Cali weather (trickle every 3 days), I have since changed to a Optima D51 in the driver side rear bin, never had to jump it ever. You can heat the plastic and mold it in there without cutting the bottom. Little more pricey, but definitly worth it.

As for HKS, definitly a must. A little pricey, but it's very easy to install and bottom line works. I've done a back to back dyno with and without when I had twins it made a huge difference at higher rpms.

2wheelsmoker

I had a similar setup from before:

Garrett T-67 T04R (T4 "GT35" exhaust housing) VBand .84/.70
Rotary Aviation Apex Seals (RA Super Seals)
APEXi PowerFC
GReddy EVO2 4" Exhaust
JPRO Downpipe
GReddy Profec B Spec-II Boost Controller & Turbo Timer
Rotary Extreme VMOUNT Intercooler
Koyo Radiator
HKS Twin Power Ignition
1300cc Secondary Injectors
Walbro 255lph Fuel Pump

I made 422whp at 15psi. That was fine and dandy until an oil ring gave so I replaced all seals with a Mazdaspeed kit and I'm waiting for a tune. It now has a mild streetport, lower compression FC rotors, and a new RX-8 eccentric shaft. The cars seems to pull just as hard as before but after the tune I'm hoping to get a smooth 400whp at 12-14psi.

Anything more than 15psi and I hear you need water injection. I don't want to venture in that territory as 400+whp is more than enough for me.

fendamonky

iTrader: (6)

I'd agree that the HKS Twin Power and A/I system's are a very good idea. I've got the twin power in, and will be installing an A/I for myself in the next month or so..

Have you done anything other than what is listed?? I just ask because it seems to me that you are neglecting the rest of your setup in favor of up front power. If I remember correctly Goodfella was running out of fuel on his BNR dyno run (421whp @ 17.5psi) while using the Supra pump. I've got a Bosch 044, it's kinda noisy but pushing 16-17psi @ redline with 850cc/850cc @ 50 psi (effectively 1000cc/1000cc) I'm only seeing about 70% IDC. The 044 is kinda noisy, but you will not run out of fuel..

You may want to see bracing your drive train (Banzai Diff brace, Tranny brace, Gotham Engine Torque brace). Also look into your suspension and braking as well.

Wild7

So the 1300 secondaries gave you no problems?

The installer told me 850s for primaries weren't very streetable. He also mentioned he had run a 550/1300 set up on a slightly bigger single then mine and had no issues. I just question it because Zero R, who I bought the Turbo from, tells everyone to go w/ 850/1680.

I thought the Supra TT pump was good for more then 420rwhp..?

I think I will be getting an HKS Ignition System. As for the water injection... seems kind of overkill?... I might though.

I'm kind of going cheap on the brakes, which I hope I don't regret...

And yes, I upgraded the suspension w/ Tokico shocks and Eibach springs.
I'm also buying new wheels shortly w/ 9.5" in the back and 8.5" in the front to help w/ handling.

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bryant

to answer your question,

no 400 to 425 horse is never enough!!!

once you get there and get use to it you will want more.

2wheelsmoker

My injectors gave me no problems but I had them cleaned anyways to increase flow/spray pattern. My fuel pump has not given me any issues to date. I think the limiting factor is my turbo but like I mentioned I am not as power hungry as most and have actually considered detuning it to 350whp for track duty. I'm not that good yet and I don't want people to laugh at how slow I go in my fast car .

fendamonky

iTrader: (6)

A good v-mount setup will keep you at (or just slightly above) ambient wrt intake temps. Water/Meth injection further lowers intake temps. If you can drop IAT's from 60's to high 20's-low 30's in a couple seconds using the stock I/C just think what it will do with a V-mount... colder air = higher HP and less chance of pre-det.

Probably not the most responsible decision I've seen on the forum... may want to upgrade those stopping mods as you increase the go fast bits.. that whole balance thing ;-)

pwwatkins

Hks twin power is sweet..If I were you, I would go 850 and 1680's, supra pump, and if you are going to get water/meth injection then do it now so you can get tuned for 22 or so psi and run 15-17psi without the injection. If the tuner has trouble tuning with the larger injectors, then maybe you need a different tuner.
Also, if you want some serious hp later you can always add another supra pump.

Wild7

Well w/ the shitty 91 oct we get @ the pump here in CA, I will be staying under 14psi. So I guess water injection would be overkill for my set up. I think w/ a mild port and the rest of my set up I should see 400rwhp @ 12-14psi or at least close to it.

Ya, I thought the Supra pump would be fine as well and so did my installer.

I got a msg from Zero R just today and he said the reason he tends to stay away from the 1300s is from problems he's had w/ them in the past (1 out of every 10 he said). But it does sound like it will be safe w/ my goal... As long as I'm not that 1 out of 10

On the topic of Brakes. I was thinking I'd just go w/ better pads and drilled/slotted rotors. Might not be adequate eh?

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pwwatkins

Don't waste your time with 1300's...Your tuner should be able to tune it with 16xx's
Plus, if you want more power later, which everyone does, you won't have to change them again.

SLOASFK

iTrader: (5)

Aux Injection is anything buy overkill. It will protect your motor from the low octane gas you have. It will also protect you from a bad tank of gas...

Archie

iTrader: (-1)

I run 850 primary with no issue, who is doing your tune Wild7?

My suggestion:
-850 primary/1680 secondary (kick *** duty cycle, you'll end up going bigger later; save time/money.)
-HKS TP/FC1000
-Walbro pump

AI is pretty awesome and after my engine gives up the ghost, I'll definitely consider it. My car is tuned for 93 and how I wish I had it now, being in Cali. As for brakes, man... you need to consider a big brake kit or at least some beefy parts. I'm putting 365whp and my stock discs/calipers with Hawk pads are inadequate. Hell, I'd love to rip my brakes off my 8 and throw them on my FD.

Wild7

Just bought the HKS Twin Power Ignition System + Harness.

I need to talk to my installer about the water injection before I make my decision.

Ya, I think I will need to just take the cost hit for the bigger brakes. Would suck to drive all that money off a cliff in the twisties lol . I don't need anything fancy.. Just something that will get the job done. Suggestions?

Thanks to all the people commenting

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grimple1

iTrader: (1)

My brake suggestion:

I think the RX7 has a nice braking system with multi-piston calipers. Get a good set of pads and you should be fine. Hawk, Axxis, etc..

If you still are sketchy after that then you can look into a brake system....and thus spending more money.

seanfd3s

https://www.rx7club.com/3rd-gen-archives-73/some-fuel-system-ramblings-578521/
this might be helpful; after finding it I've decided to pull my supra pump and put the bnr32 apexi pump in.

Wild7

Ya, that's what I was thinking. Just buy some new slotted/drilled rotors and some better pads.

But some people disagree I guess.

Wild7

Nice link, thank you
It looks like I should run that pump by my installer.

I noticed yet another person using 850's as primaries in that thread and w/ the 1300 secondaries too.
I'd like to go w/ 850's as well just to be safe, but my installer insists it is not good for street use (i.e. at idle).

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