Edman951

So i've been toying around using <a href="http://www.turbofast.com.au/turbomap.html" target="_blank">http://www.turbofast.com.au/turbomap.html</a> to find the best turbo for a quick spool 300-325rwhp turbo that will still hold boost to red line. Here's what i cam up with.
Give me you're input.
I know that i will need injectors,afpr,map or maf conversion,custom downpipe,custom water and oil line's and intake boot.

Jeremy Martin

dont trust that calculator, it requires some pretty arbitrary numbers to work... one thing you'll want to consider that that calculator doesnt take into account is that our engines are sohc 2 valves / cylinder, so we dont flow with the big boys (standard import performance engines for the past 10 years are dohc 4 valves per cylinder) the garrett t04 is a little big for what you want. go for a t3/t4 hybrid (common on supras and other power rice build ups). you'll have a quick spool to the 330 hp range; if you do want a t04, go with the t04e with a 60 trim and a .62 a/r. that will be a slightly longer spool to 20psi but will have the efficiency headroom to push it up to 30psi if you think your engine can take it (which it probably can on 110+ gas). upgrade the injectors to match (you will probably want to go 52-55 lb/hr, each of those will be good for about 110 hp / injector.. * 4 = 440hp), along with a new air flow meter (get an adjustable maf) and a custom burnt chip set to match the new boost map of the new turbo. a boost controller will be vital, but a cheap bleed valve will do if you dont want to put the dough into it.
then burn rubber and show them who's boss.
<img src="graemlins/burnout.gif" border="0" alt="[burnout]" />

Dan87951

Sure wis I had the money for one of those!

Russ Murphy

I researched my turbo upgrade looking at compressor maps online as well. After spending considerable time, I ended up calling Jason at TEC and relying on his considerable expertise matching turbos to the application. Most of the compressor maps online are far from current(e.g. accurate). Jason set me up with a TO4E with 46 trim and a big 'ol compressor housing to meet my hp goals of 400-440 hp. So yeah, I'd have to concur with Jeremy in that the T04E is probably big for your goals and not to trust the calulators. Call Jason. 303-271-3997

Edman951

[quote]what you want. go for a t3/t4 hybrid (common on supras and other power rice build ups). you'll have a quick spool to the 330 hp range; if you do want a t04, go with the t04e with a 60 trim and a .62 a/r. <hr></blockquote>

Well first if a t04e-40 is to big then a monster t04e-60 is way to big no...
But the reason im looking at compressor maps is because i don't just want to buy a stage 1 or 2 from a tuner. I really enjoy searching an learning first before buying. I'm not saying that what the tuners sell is not good for me but i want to know what im geeting exactly and when looking at turbos i thought compressor maps was a good way to learn and find a good turbo with what i want. I understand why tuners don't tell people the exact spec of there turbo's, but if a company like turbonetics give out bad flow maps of there turbos then why whould they put false info in there catalog's? Im sure in not the only guys looking at these flow maps to give himself an idea of what he needs and then contact a tuner to get his advice and then buy that turbo from that tuner.
So those this mean i'll have to call a tuner and ask then what stage turbo will fit my exact boost curve i would like to achieve? That sucks

So what's the fastest spooling stage?? turbo that will hold 325rwhp safely?
Am i the only guys looking for fast spool up turbo because it sure seams like everybody wants 450+ hp turbos.

Russ Murphy

I agree, all the "stage" crap is infuriating, but ultimately you'll need to talk to people with first hand knowledge. Before talking to Jason at TEC I was looking at much bigger compressors based on what I was seeing in the maps availible. After asking about a bigger compressor, Jason suggested a slightly smaller one than I was thinking of, and the reason he gave is that HE HAS ACTUALLY INSTALLED AND DYNOED BOTH, and the smaller one spooled-up much quicker and it generated the same peak hp. That's kind of neat info to have. I'm sure Tim @ SFR could give you all kinds of insight as well but it's kinda of hard to find out exactly turbo you're getting. I understand about keeping hard won knowledge close to the vest, but I'm an inquisitive guy.

Jeremy Martin

you're right, the stage stuff is useless... and it's not that the flow maps lie, it's that the calculator is a bit useless. typically a flow map will be customized for the engine it's hooked up to, so it will be easy to gague a turbo's performance matched to an engine; those are generic flow maps, though, and are not very good at showing how a turbo will perform when matched to an engine... that is what they calculator is for, but the calculator isnt good at at it (my experience anyway).
i reccomended a T04e 60 with a .63 a/r because if you're going to go the T04 rout you might as well get a turbo that will supply whatever you could possibly put through that engine; i.e. the last turbo you'll ever buy. if you want a quick spool though, stay away from them definitly. have you looked into variable vain turbos?

TurboTim

If you want something that is going to fit somewhat easily underneath the intake manifold, then you will need something in a TO4B housing.If you want something that will fit with some work, then you can go for the TO4E housing.I would go with the KKK type hotsides so that you can get a "bolt-on". Otherwise you have to cut the flange off the crossover pipe and weld on a new one.

Edman951

Tim, i saw on your web site that your stage 1 turbo will achive 16-18psi at 2500rpm, in what gear?
Is that the fastest spooling turbo you can make with out going BallBearing?
Please informe me with what kind of boost cure this turbo would have.
i'm really looking for a really quick spooling turbo that will never see past 350rwhp. My goal is 325rwhp and i don't plan on ever passing 350rwhp.I will do all needed upgrade to achieve 325rwhp.
Thanks in advance Tim
And thanks for the advice Russ and Jeremy <img src="graemlins/bigok.gif" border="0" alt="[thumbsup]" />

Jason_86_951

My buddy has a 89' Shelby CSX that has a Varible Nozzle Turbo in it, the Garret VNT-25. It's pretty fricken slick, it feels like a supercharger, the boost comes on smooth as silk right from basicaly idle. I've often wondered how one of these would do in a 951, I know high boost wouldn't work as well as some of the other turbos availible for these cars but if autocrossing was your primary goal one of these or a modified VNT might be the ticket. Turbo experts please take a look <a href="http://www.chuckiii.com/Reports/Physics/VNT_turbo.shtml" target="_blank"> here</a> <a href="http://forums.tdiclub.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=4&t=001770" target="_blank"> or here</a> and let us know what you think.

Thanks
Jason <img src="graemlins/yltype.gif" border="0" alt="[typing]" />

adrial

I think someone mentioned variable vane turbo's before....and the consensus was that Garret is just too small to make any decent power for the 951..

It sounds sweet though...I wonder why Garret isn't marketing it more?