hey people,I might be comeing into some money soon and i need some good ideas on witch turbo i should buy. let me tell you what i am working with first and what i want out of the turbo.I am starting off i with a J-spec s5 motor ( i heard the ports on the J-spec are bigger that the usdm motors)and will have it rebulit with 3mm apex seals and other beafer parts.

what i would want from the turbo is

1.quick spool up. i don't want to have to wait pass 3,400 to 4,300 rpm

2.i am looking for 350+ to the wheels , if i could get it around 370-385 it would
be perfect

3. don't want to have to turn it up past 18 psi for max power ( well maybe ?)

i plan on trying to put it togeter with a v-mount kit, 3 to 4 inch down pipe and a nicely sized wastegate. what i am looking for is a bit of power and responce.The car will be mostly used on weekends, meet up spots dring the week (2 or 3 times a week) and the now and then street race. so for most of it's life the boost woun't be turned up unless needed.

so let me know what you think?

p.s. will go ball bearing one if i must but trying not too, also not trying to port it too much i am trying to keep it as relieable as possable

 

Why do you want 3mm apex seals?

 

The ports are exactly the same. "J-specs" are just junkyard engines from Japan. They are almost identical to the North American engines with a few minor (fuel lines, EGR) differences.

Don't bother with 3MM seals unless your rotors are too worn to accept 2MM seals and you know a machine shop that will do the milling properly.

what i would want from the turbo is

Check out the BNR hybrid stock turbos, or the GT35R.

What is magic about 18 PSI?

3" is fine. V-mount seems a bit excessive since regular front mounts work just fine at these power levels (and well beyond).

What are you going to do for management?

 

A To4E 57 trim works well for the sub 380range, however it will take 18psi to make that power level. It does spool incredibly fast however. Otherwise as stated the Gt35R..

 

That power can be attained with a BNR turbo for a lot cheaper than you are thinking. Then you don't need to change exhaust your manifold, or your exhaust. You also probably won't need to beef up any engine internals for that power level either. A stock rebuild should be sufficient. You never mentioned what EMS you plan to use either, which is a major factor. Unless you are skilled at tuning an aftermarket EMS yourself, I never understand why people think they can "Turn up the boost" when it's race time. I've always felt different boost levels should each have their own map in the EMS, for max efficiency and reliability out of your motor. Keep it simple, and plan it for one power level. Once you get bored with the setup, upgrade and retune....

 

Sorry, double post

 

haltec , i hear they are great for rotorys and not hard to tune. some old school friends of mine say that i should go with a motec if i can find a good tuner, but that tuning a motec is like rocket science ,lol. this shop that took a look at my car old me i should go with hks sence they come with base maps and are about the same price of haltec.other people told me i can go with apexi sence i am not looking for big powerand there cheap but i heard people have had problems with them. but at the end of the day it will mostlikey be haltec

were can i find BNR hybrid stock turbos ?? are they stock turbos with bigger compresser wheels ? i hear To4E are kinda peaky and a i looking for something on the smother side .. A gt35 or a BNR hybrid stock turbo sounds better.

shouldn't a v-mount be better than a FMIC sence it's less pipeing ???


p.s. sorry for the miss spelling its 3:40 AM and i am kinda drunk and this chick keeps kissing my neck

p.s.s. you guys have been great help clearing stuff up for me

 

ohhh yea do you think i should put a light street port on it or leave it stock ?

 

I'm not going to reply to a post made when "kinda drunk and this chick keeps kissing my neck". Sorry, but I find it highly disrespectful to not have your full attention when you are asking for help.

 

lol! he feals like hes at a poker game and were all disscusing a rotary build, while aaron, obviously, feals like hes talking to someone who just came out of F and F and is trying to clear all the bullshit. but yeah to the OP, http://www.bnrturbos.com/. Yeah, turn up the boost!

 

yea i am going with a BNR turbo, i like what i seen on the web site and i am gona give them a call and the price for the turbo is perfect.

 

It's not a big deal, just wanted to make a point. Kids these days don't have very good manners. It takes the same amount of effort to post properly as it does to post poorly and then make an excuse.

A Haltech is a good choice and there is plenty of support in the form of base maps and the Haltech subforum on this website.

Where hybrid stock turbo start to limit you is in terms of lag and boost control. I've heard many describe the upper range of the BNR hybrids to be a bit laggy but I have not used one myself. Boost control, due to the internal wastegate, is often an issue.

I wouldn't immediately discount a turbo if it is described as peaky because it is hard to say in what configuration that turbo was used and how it was tuned. For example, in my opinion a 35R with the .84 (or .82, or whatever it is) hotside is very peaky. It comes on like a freight train but runs out of blow before 6000 RPM. I'm tuning a friend's 1st gen right now with a T4B and a big 1.15 hot side (trim unknown, it's a Chinacharger) that lays down the power in a very linear way.

 

I was able to get a hold of a local tunner and he showed me 2 turbo from hks they are both ball- bearing and around 2K

HKS GT2540R - 360/370 PS Output

COMPRESSOR:
-Wheel- 46 Trim - 51.7 Inducer / 76.2 Major
-Housing- 60 Inlet / 50 Outlet - 0.50 A/R
TURBINE:
-Wheel- 76 Trim - 53.8 Major / 47.0 Exducer
-Housing- GT25 inlet / Internal GT25 oulet - 0.64, 0.86 A/R

the other is



HKS GT2835 - 380/400/410 PS Output

COMPRESSOR:
-Wheel- 48/52/56 Trims -
49.3/51.2/53.1 inducers / 71.1 Major
-Housing- 70 Inlet / 50 Outlet - 0.50 A/R
TURBINE:
-Wheel- 84 Trim - 56.5 Major / 51.8 Exducer
-Housing- GT25 inlet / Outlet spec:
Internal GT28; 0.64, 0.86 A/R
External GT30; 0.61, 0.73, 0.87, 1.01, 1.12 A/R

they both will give be around the power i want the only thing i just wish i could find it cheeper

 

Holset turbos are cheap. check out the HX40. many people are running them over 400 WHP. and i bought my Holset for 200 bucks in pretty damn good condition. just dirty...

for the price of just the BNR turbo. you could have a real nice Holset, external wastegate, and turbo manifold. if you haggle a little for parts in the for sale section on here or watch ebay closely, you could fit in the downpipe, and oil feed/return in there for that price...

thats a much beter performing set-up with plenty of room to grow for around the same cost. Not to mention the asthetic upgrade also...

a word of advice on the ECU of choice. Find someone in the area that tunes rotarys specificly. Then ask him what ECU he likes or prefers. This is how you should choose an ECU. the tune is the most important part of the build hands down. That would make the tuner the most important tool. So dont have some tool tune your motor with an ECU hes trying to figure out on a style motor hes not familiar with...lol

 

Sage, most tuners in our area prefer tuning microtecs so I would look at microtec as well as haltec

 

don't bother with either of those, they are for 4 cylinders

talk to a guy who puts turbos on Supras. turbo sizing is not that different between the two engines, except that Supra owners tend to care more about peak dyno numbers

 

Both of those turbos you just mentioned seem a little on the small side for a rotary. Remember, our engines have a very strong exhaust pulse. This allows rotaries to spool up even fairly large turbos quickly. What you just suggested would spool up super quick, but boost will likely fall off at high RPM's. You should go to the single turbo forum amongst other places and spend more time reading. Here are some quick links

https://www.rx7club.com/spec-tuning-154/how-size-matters-478915/
https://www.rx7club.com/single-turbo-rx-7s-23/how-size-matters-compressor-map-illiterate-zero-r-472529/
http://fc3spro.com/TECH/TURBO/turbotech.html

Also, don't waste money on an HKS turbo. They are just rebadged garrett turbos. The HKS version costs twice as much solely because they put a tag that says HKS on it. Turbos like the ones you mentioned can be had new for about half of what you thought you would have to spend. Check it out

http://www.atpturbo.com/Merchant2/me...egory_Code=TBO

 

Your local tuner doesn't seem to know much about the rotary. Both those turbos are pathetically small for a 13B. They have about the same power potential as the stock turbo but a lot less power potential then even an mildly upgraded (hybrid) stock turbo.

Anything T25 is useless on a 13B.

Even the largest T3 turbos are a little restrictive.

Most 13B turbo upgrades are full frame T4.

I recommended a GT35R, and 1Revvin7 recommended a T04E. Both of these turbos would hold the typical T25 based turbo in their inducers (almost...). Listen to what people on this forum say instead of some local tuner who just wants to sell you overpriced turbos.

 

my T04e pushes plenty of power through out the RPM range. I have large manifold runners (2.5") and a 3.5" exhaust.

It spools up to 15psi at about 3400.

 

The GT35 i was able to find at a good price at cheapturbo.com ,does any one know were i can find a To4e for a good price ? but it has to be around the 370 to 385 hp that i am looking for cause i know they can come bigger than that.

any other inputs ??

 

hx40. holset turbo's are hard to beat for the price...