Whats the biggest Hot side A 7m can run

[supradan22]

Was wonder how big the hotside can be and how would spool be like.

 

[IJ.]

Guess that all depends on what sort of RPM limit you're looking at Dan!

 

[tubbie]

Well, if you can get your 7m to spin to 10000rpm, you can run a 1.15 and make boost at 8000rpm........ :bigthumb:

I would guess .83 for stock redline.

 

[IJ.]

Tubbie: Depends on the Wheel size.

A little wheel at 1.15 ar would spool fine and large one wouldn't.

All comes down to volume of gas flow ie: either bigger motor or more RPM will spool a larger turbo.

 

[supradan22]

ahh stock though i was getting a deal the hot side claimed to be .83 and i got 1.26 witch really sucks.

 

[IJ.]

LOL it "might" spool about 100 rpm before the stock limiter kicks in !

 

[supradan22]

Well i need this car running So well see how it does :nono:

 

[siman]

My god thats gagnormous!

1.26 exhaust A/R???

I wont ask where you got yours from ( I got mine at the same place LOL ).

-Jonathan

 

[supradan22]

turns out its 1.21 no 1.26 either way big mofo

 

[Selz202]

That belongs a diesel truck... i wouldnt even bother just sell it.

 

[IJ.]

Or a 20B rotary!

 

[Clueless]

I have a t04b with a 1.32 a/r turbine housing with a P trim wheel...

my old 14b turbo compared to my t04b...

 

[spoolint78]

my buddy runs over a 1.00 a/r on his 7m
i always telll him to make it a .81 at least.
no wonder the fucker runs 13.2 or whatever @120+ mph

He just built a 10,000cdn head.

Billet cams, 2mm oversize valves and everything.

Doesn't post much, but he does run a huge a/r

 

[IJ.]

Mine is a 1.06 AR but as I said earlier in the thread it comes down to wheel size.

ie: A 1.06 GT42 would spool later than my 1.06 GT35.

 

[boost PSSH boost]

I ran a 1.00 a while back...not by choice, I couldn't find a smaller one at the time and just ran with it. veeeery laggy.

1.21? sheesh....look on ebay for a smaller housing.

 

[Adjuster]

From what I'm finding, the BB GT turbo's can run slightly larger hotside AR's and still spool fine on the street, yet flow more on top as a result. (But they spool up even faster with smaller AR's, but you lose some flow as a result.)

Classic trade off here. High power, or driveablility.

I choose driveablility personally. (But the larger housing might be fun on a dyno or the drag strip if you have some way of building boost off the line, N20 or an automatic trans for example.)