zerotosixtyV8

If I wanted to just run about 5-10 PSI of intercooled boost through my 350, would a single T4 turbo be enough?

subzero

yes,but look around at different places that sell turbos..prices will vary quite a bit

zerotosixtyV8

thanks for the info. T4s are the most common and best priced. I just want a single turbo setup, it'd be easiest. are you sure that it's adequate for that I am doing. Should be... anyone got turbo maps of one on a V8?

Twin_Turbo

iTrader: (25)

For a single t4 you'll need at least a v trim compressor and a pretty big a/r p trim turbine

zerotosixtyV8

numerical minimum?

Twin_Turbo

iTrader: (25)

Well, I think the 0.81 turbine will give you only about 7 pounds or so on a normal flowing setup, If I were you I'd shoot for 2 of these .81 ones though

zerotosixtyV8

a Single TO4B has a 1.15" A/R, supposed to support up to 450 HP, that's about the range I'm looking at.

rx7speed

hehe kinda funny

T04 is the most commong upgrade for the rotary person also


a friend of mine is using the T04 internals and the stock houseing (sh<x>itty idea but it works) to run a 12.8 in the 1/4


let me look around though and see if I can find some things for you

just out of curiousity how much are you willing to spend on just the turbo alone?

zerotosixtyV8

I don't want anything over 500 for the turbo. I've found quite a few TO4Bs on ebay (most put up by broke RX7 owners who can't complete the project ) between 200-400 dollars. I want to keep my entire project cost under $2000. Thanks for the help. I'm really trying to get this thing off the ground. I care about functionality and reliability along with basic performance. nothing super fancy or anything. If it looks ghetto rigged but works great, that's my project! The most important and frustrating thing right now is figuring how to route the exhaust for a single turbo. I'd like to have a crossover pipe meeting up with the driverside pipe, weld them together, then put a turbo flange/WG flange on the pipe. I was thinking about using corvette headers. No cutting or fit issues cause I'd put it up front of the master brake cylinder. I've got a lot of room there.

rx7speed

yeah there is a lot of rx7 owners who sell there turbos online going to bigger units.
jason a friend of mine localy just got rid of one of his not long ago to install a t-60 in his car... that thing moves now


ghetto rigged is the best it works I'm happy

the one thing that sux with using a single turbo is your going to lose a little bit of spool time I would think b/c you can't mount the turbo right next to the block but have to move it away

as far as turbo size for a v8 though I can't help much with trim or antying but I can look around none the less

zerotosixtyV8

I'm not too worried about sppol time, having a V8 with a lot of low end torque helps quite a bit to bridge the gap. I am looking to get around 380 RWHP, a TO4B should do it. exhaust and my MAF are the issues I have. I dunno how familiar you are with L98 MAFs, but they are huge and plastic. I'd like to use an LT1 or LS1 MAF, but no one on the board has responded to my question of whether or not they will work.

Greasemonkey

They won't. At least not at the moment, and if the software does come out its going to cost you. If you want to do it right swap to a Sy/Ty ECM.

zerotosixtyV8

what does Sy/Ty mean? never heard of it

Twin_Turbo

iTrader: (25)

My *** man you aren't seriously implying that all t04's have a 1.15 A/R here are you??? There are as many variations as you can think off. T4 only means it uses a t4 bearing housing (cartridge)

I have 2 to4b's with s-4 compressor trim (.60A/R) and an o trim (.96A/R) turbine

Also buying used turbos is a bad idea, if you can't aord a new one think again as you're not there with only a turbo

zerotosixtyV8

no, I never said that at all. I'm talking about the ones I have found for sale have 1.15 A/R turbine. It's a TO4B with a P-Trim turbine. I cant afford the thousands for a new turbo, a used turbo, especially one that looks new and unused in an engine or freshly rebuilt, will work within my range, especially if it's for a good price. if it needs a rebuild so be it. thanks

rx7speed

oh yeah another option for you... though it will cost a little bit ($1200) is getting a haltech. if I remember right it comes with almost everything you need and uses MAP instead.
I have seen them on lots of RX-7 and they work very well for for boosted motors. they are also used on Z06 vettes and they seem to like them as well.

this will allow you to controll most everything you want as far as the car and how it runs. even comes with a nice data log tool

the only thing though is you would need some experience with tuning fuel injection systems, and prolly a good idea to have a laptop.

if you want I can see if I can get a demo for it so you can take a look

83 Crossfire TA

iTrader: (2)

Who's used a haltec on a Z06?

88 WS6 TransAm GTA

iTrader: (1)

Its the Syclone/Typhoon ECM swap. Heres the tech article: https://www.thirdgen.org/newdesign/t...nversion.shtml

@ZZKKER

iTrader: (1)

is it really worth going to the typhoon ecm over programming the sd ecm?

thanks
anthony

rx7speed

go to www.zo6vette.com

a lot of the guys over there are using them.... hehe I need to start whoring that board up

Dan91Z

I'd say it's definetaly worth it

@ZZKKER

iTrader: (1)

say i use a maf wireing harnes, would it be possible to use the typoon ecm? correct me if im wrong, but i think it would be, i would just have to convert the harness to the sd pin and splice in the right map connector.
i also plan on running a multi stage ignition controller to control my sequential turbo setup, so is the ecm swap nessecary if i use the multi stage controller?

thanks
anthony

83 Crossfire TA

iTrader: (2)

The syty ecm has a different pinout then both the maf and sd f-body ecms, so I'm not sure that it's that much more work to go to the 749 from either, you just need to add the wiring for a map in the place of a maf if that's what you have now.

Is it worth it? It depends on your goals. If you intend to stay under roughly 450hp and are willing to deal with the slower tuning process of buring chips, then it's worth it. The 2 big advantages is that it's cheaper and GM put a lot of hours into their ecm's to make sure that they work well under all conditions, and you have the bennifite of that work.

Over 450... I doubt it. I haven't actually seen anyone get any of the ECM's that we're talking about running well with over 36# injectors on a V8 (450hp is roughly where you'll start getting to the ragged edge of 36's on most boosted applications). To be honest, I haven't actually seen any with 36's running well enough for me to be happy with them. You'll run across people every once in a while trying it or that claim to have it working but it seems like they dissapear before they're done or you can ask any real questions.

83 Crossfire TA

iTrader: (2)

OK, I poked around there and all I could find is Halltech (not Haltech) intake and MAF boxes, I'm assuming that the MAF box is like a MAF translator but I didn't find any information and neither are listed on the Haltech site. I can only assume that it's a different company then Haltech not just a misspelling.

I didn't see anything about Haltech ECM's and for that matter looking around Haltech's site I don't see a model that would work with the LSx setup without a lot of work...

That's not to say that I wouldn't love to see Haltech making something that would work for that market..., but with the exception of their new E11 which hasn't been reliesed for most applications, their ECM's are relatively primitive (but effective) relative to a GM OBDII ecm or for that matter a Motec, Fast or even a DFI GenVII.

rx7speed

ok I made a mistake

didn't read into things far enough but it is a halltech intake I guess


hehe half asleep when I read it the last time

but what problems would come about using the haltech vs the stock OBDII ECM for the ls1?

and how does it seem primitive?

True Power

There are LS1 people just using LS1 Edit to program their stock ECM. In fact, that's all i heard of LS1 people using. And many of them are not slow (9s, 10s)

83 Crossfire TA

iTrader: (2)

Problems? well, to start with you'd have to completely change the ignition system.

Primative... they are in different legues. The Haltech stuff works well and most people don't need more, but for the most part they're using 15+ year old designs.

The newer GM ecm's are fairly sweet wrt what they can do and how fast they can do it. My biggest gripe with them is in regard to the hassles that all their extra ablilities cause you when you have to go in for emissions. In MD they can plug into the ALDL and the ecm will tell them what has been disabled, tricked or just doesn't have enough info to report on (ex, something that usually isn't on the car or not collecting all the data it needs).

It's somewhat like comparing a 80286 to a P4...

rx7speed

ok

I know they are used a lot of the rotary application but that is partly due to our stock system SUCKS for the turbos!!!!!

I was just thinking though for a boosted application they might be of some help

my money though would be on the AEM unit if they ever made one to work with a second gen rx7

83 Crossfire TA

iTrader: (2)

As long as you stay fairly close to the range that the factory MAF can handle, or even a ported maf, there is less then no reason to change. On the '94 and up GM PCM's that's reasonably high (I know of people running stock PCM's with 700+hp), but on 3rd gens that's right around 300hp (so there is a fairly good reason to change there).

If you just need something that will control the a boosted engine well, a Haltech is fine (that's what's on my brother's car, I've got a lot of experience tuning it).

AEM :rockon:

rx7speed

hey I would need all the help with the haltech I can get


hey do you have an AIM name I can contact you with since you seem to know a litle bit about ECU tuning?

83 Crossfire TA

iTrader: (2)

Not sure that I'd be all that much help. My experience with the Haltech is that somehow I managed to get it the tuning dead on in a few cars by just sitting in the passenger seat of the car with a laptop and tinkering. My brother kept saying "well, when I get it dyno tuned I'll pick up some HP..." took it ot the dyno and it showed him a perfectly flat A/F curve and everything that he tried changing (more fuel, less fuel, more and less timing...) ended up dropping the HP.

But the thing is that what the 'somehow' is I couldn't really describe, it's more a process of trial and error through which I seem to get incredably close. Personally, I think that the Haltech ECM's are very easy to program and have very good base setups anyway.

I don't AIM (currently, I use trillian that does allow me to do it through the same interface, so it would be no big deal), but I do ICQ (5834987).... OTOH, I've been having performance problems which seem somewhat related so I've had it turned off most of the time lately