i've been wanting to build a relatively cheap single turbo kit using a T4 turbo that flows about the same amount of air as the stock twin turbos...

i was thinking a t04b v1/v2 compressor or a t04e 50 trim. anybody know how many CFM the stock twins flow together?

 

t04e or apex rx6 if you can find one

 

Twins flow more than a 50 trim.

 

Elliot,

What is the flow rate on the 57 trim T04e in my car? It spools as well as the twins in my setup. What is the flow rate of the stock twins, or the 99 spec twins?

 

let's assume the twins make 360 rwhp when fully tuned out.

the rotary needs 1.92 CFM per rwhp.

360 X 1.92 = 691 CFM/ 14.471 = 48 lbs/minute.

to4e 50 and 57 trims make approx 48 lbs/minute.

while max flow is similar the single turbo would be significantly more efficient.

hc

 

that is interesting. could you explain that formula you used to get the CFM of the stock turbos? i knew the twins flowed a lot of air, but seeing that they flow the same amount of air as a t04e 50 trim really puts it into perspective.

so basically i would need a turbo that flows slightly under 50lbs/min

my goal is to make a decent single setup and use the stock ECU for a while. my stock turbos are blowing oil and i just want to replace them with a nice single turbo of about the same airflow.

 

49 lbs

 

why not just pick up another set of twins and save for single?

 

Jacob,

their is one major flaw with your idea, the stock computer uses a speed density system with maps, just like the power FC. it does not self learn, as a result, it cannot adjust

remember while the upper end flow might be the same the area under and over the curve, as well as the curve itself will be different, and this could cause you to be looking for a new motor as a result.

cheers

kenn

 

yeah i'm aware how the stock engine management works

you're right about that, but i wouldnt be bolting it on and just going out and boosting expecting everything to be the exact same. i'd check it out with a wideband, and if the AFR's are too lean i'd pretty much just cruise around in vacuum til i get some sort of aftermarket ems again.

i'm not a newb with this stuff, and though it does sound a little silly and cheap, if the compressor puts out very close to the same amount of air, the AFR's could be quite close with the stock EMS. i wouldnt be able to go over 11psi anyways, due to the stock ecu fuel cut, so the point wouldnt be to make more power. it would just be to get rid of the crappy twins and replace them with a more reliable turbo of the same airflow.

i've done quite a bit of tuning and i've had several different turbo/EMS setups on different rx7's. i'm just looking to a good -albeit, relatively cheap- alternative to the trouble-prone stock turbos. the stock ECU does a fine job controlling the fuel with stock -even nonsequential- turbos. i think it would do a decent job controlling a replacement single turbo if the compressor is right.

are there any aftermarket turbo kits (apexi rx6 kit maybe?) that are made to be run with the stock ECU? just curious.

 

cartmill drinks his own pee

 

So thats why......

After seeing all the problems in the past with the to4 he was "trying" to run in the past, (about a year ago) I figured there must be a good reason, why he was asking this question now.

kenn

 

even an SAFC is better than nothing man.

 

now this is an interesting project! very interested in seeing how it comes together.

 

I agree with 'arghx'...an SAFC could help matters a lot.

 

??

i never had any problems with the t04b v1/v2 on my TII

 

you can borrow my stock FC turbo jacob, lol.

 

I'd like to see someone run twin HT18's. it'd probably do over 400 to the wheels i'm sure.

 

i have found a good condition t04b v1/v2, but i think it's going to be too agressive for the stock ECU. i may try it for a while anyways just to see how it works.

 

Unfortunately this is where lab work doesn't meet reality. I've ran that turbo on the dyno several times and it doesn't match those theories. Don't take it as a dig or anything, just trying to relate...

 

to go with that, i'm not so sure the rotary needs 1.92 CFM per WHP

 

im gonna bump this thread because i want similar results. I want a more reliable replacement for my twins especially with all the crappy ones being sold now. My goal is to make 300-350hp w/ a streetport, power fc, 850s all around, supra fuel pump, ic and full 3" exhaust. I know the rx6 would probably be the best bet but its pricey. So i was thinkin TO4E.

 

T04E 54,57, or 60 trim, each making more power and more lag then the other. Run a T04S compressor cover, its more suited to the flow numbers and boost ratios you'll be running then the T04E compressor housing/cover (T04S has a .7 A/R were the T04E typically have a .6 A/R although I've seen .65 and .55 also). I suggest a wet center section for longevity and a 360 thrust bearing for robustness, P-trim turbine wheel and .84 A/R divided turbine if you get a divided manifold, if you get a non divided manifold, go wiht the .81 A/R turbine housing.

~Mike...............

 

i am currently running a series 5 turbo and manifold on my fd with stock ecu......works great with no problems.....