5558 Precision Turbo build
 

Finally ventured to the FI world. Rohtech Motorsports built the motor for me. 95% complete. I'll be brief on what the motor has.

1.New housings and irons, 6 port (Builder specked out everything, micrometer , etc.)
2. Upgraded seals (All)
3. RA Black Super Apex seals
4.1000 CC injectors
5. BHR ignition w/10mm wires
6. 5558 Precision Turbo
7.43mm waste gate
8. V-Band bracing for intercooler and exhaust pipes
9. Haltech Sprint RE standalone.
10. Custom motor mounts.
11. Cable throttle to manual throttle body.
12. 4 inch exhaust
13. 2.75-3.00" Intercooler with piping
14. Meth injection kit.
15. ACT 6 puck clutch
16. Walbro 255 (possibly changing that to a bigger pump)

Its 95% complete. Gauges work, A/C works, and it starts without hesitation. The bad, the master cylinder blew and we noticed a small leak from the coolant tank. So awaiting on parts. Should be driving by Christmas( break in then dyno tuned).

Just wanted to give you guys an update. Oh his last RX-8 build,auto RX-8 that he made Turbo, Haltech tuned, made 420 WHP. That turbo was a small Greddy turbo that came with the Greddy RX-8 kit. 2 years later that car is still being driven pretty hard. Very hopeful on my build. I'll have pics in the next week or so where everything is nice and pretty.

cough hack splutter ..............." I don't think so Tim "

Apart from that ........................... Good luck with your build .

You can call Rohtech and speak to the owner directly.

Why would I ?
If you have been following these forums you will know that 400whp on a 6 port manual has been increadibly difficult to achieve . You would also know that to claim to have made 420 with a turbo that, on an auto ,is capable of about 230whp ,is just ....................................funny .

that's a decent turbo that will come online fast. The issue is going to be running the amount of boost it takes to make the power you want... I second all that Brett has said btw

Brettus thank you.

You are talking the guy who had holes drilled into his housings as a type of bridgeport by his epic experienced builder and thought it was perfectly fine to rev to 10,000RPM, :lol:

I'm shooting for 385 WHP min , max 450 WHP. I went with a side turbo setup for instant boost, thrust and throttle response. Can't guess on the psi until we actually dyno tune.

I was shooting for 300 whp.... Then I blew up my engine and bout a 2010 S4.

Now I have 300 whp.

This is true . It worked for a year then failed. The cause of the motor to fail was not only poor work on the previous builder but my SSV actuator was sealed frozen with carbon. Along with improper oil seal lengths, etc. my current builder laughed and said nooooooo! So it was a ambitious idea but failed.

I hope you are joking with this statement. :lol:

That sounds like the dyno turblown uses that makes 500WHP at 12 psi. I highly recommend you get it dynoed on a second machine before you go around saying you have x hp

Actually I am joking . Guy had a GT35 turbo 4 inch snout. Not that POS small Greddy turbo. LoL. I was hoping you chimed in 9k. LoL

You are still full of shit. You don't have to lie to kick it brah.

I am pretty sure Titan Motorsports dyno is pretty accurate. That's the dyno he uses.

Dead serious lol. How about we focus on my car and see what she makes. After all you inspired me with all your insults. Lol I went to a professional like you said all along.

You must be a salesman's wet dream.

She said the same thing....

You still have an auto though right?

No I'm 6 speed.

this is going to be EPIC.
and by Epic, I mean a total failure.

Subbed for results.

And why is that? Please enlighten us with your infinite turbo knowledge and tuning.

Daily: do you remember who has hosted the largest FI dyno tuning sessions the RX-8 community has ever seen?
I've put over 100 RX8's on the dyno, dozens of them FI (turbo, SC, and Nitrous)
I've hired and worked with some of the best tuners in this community.


That turbo will not make you 425 whp.
THAT is the imminent failure I speak of.

OP,

Your thread reminded me of this.

Beware Before You Buy

I am sure you will say your builder knows all, precision is the shit, etc. but none the less you should educate yourself.

Theoretically that turbo could make about 450WHP all in on a 13b-REW. Add on Renesis tax and it's probably about 400WHP capable, but that would most likely take about 25 to 35 PSI of boost to achieve that kind of airflow. But you won't know until you try because Precision is a joke and doesn't have compressor maps for their shitty turbos.

My builder doesn't know all. But he has been in business were he worked on Reneis motors. Not like my other builder who knew more about old school motors and knew diddly squat about the Renesis.

I heard all the naysayers say that it's impossible to wire a Haltech to a Rx-8. Cobb AP and interceptor X is the only engine management system to go with. Your gauges won't work, this won't work , that won't work. Yet my car turns on fine, all the gauges work, even the A/C. I was told I couldn't do a side mount turbo. Yet the builder did a custom turbo manifold and there the turbo sits.

I said my goal is 385- 450 whp. Even my builder said most likely the hold back will be my fuel delivery even with 1000 cc injectors and the walbro 255. The majority turbo cars have a returns style fuel system, my car doesn't. Like he said, until he dyno tunes it. He won't know for sure, so no need to say yes it will work or no it won't.

Precision turbos use to suck back in the 90's and early 2000's. They don't now and many reputable tuning shops and professional drag racing team use them. But to say a turbo is bad or good is subjective. Unless it's a EBay turbo, then it just sucks all out right.

I don't think anyone was saying that . What we may have said is that you will be able to tune your engine with it , but everyday driveability will suck . So .......... how is your idle and low rpm behaviour ?
Do you have functioning SSV,APV and VDI ?

I wired a Haltech into an RX8 in 2006....had so many trigger/ignition issues that it is an expensive paperweight

Might be better now...but if the fast drag guys are any indication the timing/ignition on those things are flakey and blow up engines

Good luck with your goals.....

The issues with the Haltech are well documented and a couple claim to have gotten them working well but it's all talk I have never seen any actual proof (1 dyno sheet doesn't prove shit).

I also don't recall anyone ever saying the INT-X is something you should go with, unless that was 8 years ago. And even with crap like the INT-X, the car turning on, AC working, gauges working, etc were never really the issue so I'm not sure where you are getting your info, you must be thinking of REW swaps. And plenty of people have done custom turbo manifolds on RX-8's so I don't know what you are talking about there either. As for Precision, they are hyped a lot and marketed well, that is all, and yes drag racers use them, it's called being an aggressive sponsor. That write up is fairly recent.

Either way, you had the same attitude about your last build and look how that ended. Anything north of 350WHP (being generous) on a consistent basis is just a pipe dream. Get real man.

Yeap low mount custom manifold is not that hard to accomplish. Heck MM made one a long time ago. This is with a CT3-6765, which is quite a bit bigger then the precision 5558 with a 50mm wastegate. And this is with my APV valves still working. Are yours? I noticed the actuator is not installed. I'd be really surprised if it is with that placement. Custom motor mounts?



https://www.rx8club.com/attachment.p...1&d=1417897242

Do you mean brackets or mounts? I simply had to build a stronger better bracket on the passenger side only. No slamming the engine down, getting the drivetrain out of alignment, and droping the oil pan to the ground. It is still sitting on stock style mounts.
https://www.rx8club.com/attachment.p...1&d=1417897062
https://www.rx8club.com/attachment.p...1&d=1417897134

And finally you may want to check out this thread and do a few calculations to see how much power you might be able to make from that size turbo. Sure these are not your maps, but I'm pretty sure precision has no great technology that gives them twice the airflow of anyone else.

https://www.rx8club.com/series-i-maj...60-1-a-255979/

Hands down the best low mount manifold I've ever seen on an 8 :

Attachment 220391

With a precision 6266 turbo ......... now that's a 400whp+ turbo !

yeap that was my #1 choice.

You should have copied it then ;)

I would like to try one with front and rear tubes of equal length ... I really think that would bring some gains due to our strangled ports.

I thought about it, but my fab skills aren't that good. They're not very good at all, but I managed to get it to fit.

You would have been better off with the Greddy manifold and an upgraded Greddy turbo .....................seriously !

My manifold setup is very close to this one.

9k attitude? I admitted I chose poorly on my first builder, so what is the problem? I went with a professional builder/tuner this time around. 9k you wouldn't believe me if I got 300, 350 or 385 whp. So you might as well log off now from this thread. Remember if you can't pull it off, nobody can.

The person who had problem using the Haltech I suggest finding another tuner. I'm the 11th RX-8 that he is using the Haltech Sprint RE on.

Naysayers never came from this board. Owers of modified RX-8 in my local community was talking negative about my build. The ones who I invited to the shop were speechless and there was nothing but how? Why? And no way thrown around when they saw my car.

My car is not daily driven, it's a fun car for the person that chimed in and said I would have problems driving it daily.

I'm signing off.

And he told you this is the 11th RX-8 he has installed the Haltech on or you know of these mystery cars and they run fine? Are these cars boosted? Your builder sounds like Turdblown and their claims of the many successful Rx-8 turbo kits that they have installed yet they only regurgitate the same single dyno result from an engine that grenaded on the dyno after making one or two successful runs.

I don't have an attitude, I am stating my opinions. You just seem very gullible and refuse to come back down to the real world where no one (professionals with deep pockets or otherwise) has every been able to put down the kind of numbers you expect with any sort of consistency.

Nothing your builder is doing is ground breaking so the results will be in line with what we have seen many times over the past 11 years or so. And yes, you admitted your last venture was a failure but at the time you were just as defensive as you are now, and you had the same level of confidence in your last builder (rotary expert, 20 years experience, blah, blah, blah) as you are now showing in your current build. I know you don't like to hear the nay sayers but we are just being real with you. The same way we were when we told you your last engine would end badly (and it did quickly) when you were revving it to 10,000RPM.

looking forward for results when will u have the final result??

I'm here for the show...

So much fail in this thread and this isn't in reference to the OP ... some of you would be better served to remove stupid commentary

Precision makes a good turbo, a friend with a 5560 is making 460 hp reliably on a 13B with race gas and 20 psi boost. Hits full boost at 3100 rpm and drops pff to 18 psi on the very top end. One of the issues here is most of you guys run street gas (not well funded half assed setups too in many cases). E85 can achieve or exceed race gas output.

The bigger issue IMO, is that the turbo is on a Renesis and he expects to get up to 450WHP because his builder claims to have made 420WHP on an automatic RX-8 with a out of the box Greddy T618Z. And claims that it is still running fine two years later.

But we shall see.

An auto 6-port with real fuel and a pro-build; how many have you seen?

If you want to LYAO on BS then I'd direct you to most of the replies in the Mazmart 20B NA thread. Most of the clowns here won't drop $10k in a turbo build, but then thinking you can get 400 HP streetable 20B for $20k is as fantasyland as it gets. I guess they forgot that street able also means passing an emissions test with the aftermarket non-OBD ECU that they also didn't include in their dreamer budget forecast ...

Absolutely zero. Have you seen one?

A properly built and tuned 6-port with that turbo and good fuel should make 400 hp no problem, how long it will last is another story

But anyone with any sense will swap to a 13B in the first place, I'd never waste my time on an FI Renesis if that makes you feel any better

With a stock Greddy T618Z and being driven hard for two years, I just don't see it even with a Drummond build or something of that caliber. And yes, I agree the REW swap makes the most sense for many reasons if someone is looking for a fun 350-450WHP with some sense of reliability (depending on the builder and setup). But then again if I really had any sense, I would be driving a new Cayman or a used NSX or something, :lol:

You only think that you're driving it hard, but who here has pushed it with 116 octane race fuel or E85 fuel? It will still fall off on top, but there is more available low-mid range than you see here because street gas limits this significantly. The point is that the details matter, I.e. 4-port or 6-port auto?, etc., but nobody bothered to ask before posting their own dumb rebuttals.

The NSX's are hard to find...and then you would be looking for more power with that as well...

Have you driven a new Cayman?

I still think bang for the buck I have a lot of car for what I have spent :-)