24psi on to4e 50 trim?

[jason_guy_yeah]

Ok, by garrets turbo sizing equations. And I'm playing with the PSFC, temp and A/F. I got roughly 24 psi but, so far the best turbo I've plotted is for a to4e 50 trim. But, my HP goal is 400. Does this sound right? It shows I should be running 36 lbs/min.

 

[Steven.]

upgrade your turbo, to liek a GT30 or aroudn that size.

your probabaly maxing out the turbo

pretty much all the 400hp D series ive seen run either T3/T4 57Trim or GT30

 

[jason_guy_yeah]

whoops, I failed to mention I'm usining it on a b18b

 

[Steven.]

still shoudlent matter, 24psi is probably maxing out the turbo

 

[wmertz]

ya upgrading the turbo would be a better decision, like he said you will be pretty much mxing the turbo out.. if you go bigger, you will be making the same ammount of power with less psi

 

[TiiM iiS l3eAsT]

upgrade turbo

 

[mike@synapse]

50 trim is way to small for 400whp goals. at least a 57 trim, if you want the best turbo gt3076r all the way.

 

[jason_guy_yeah]

cool, thanks guys

 

[Ion22]

How much where you making with the 24psi??

 

[jason_guy_yeah]

I haven't finished my build yet but, by garrets formulas 405bhp.

 

[watisjdm]

gt30 ftw

 

[RedLine42]

GT30 ftw

Edit haha I posted then saw you have had the same post.

 

[jason_guy_yeah]

hmmm...I'll defintly have to plot out the gt30 maps, thanks alot guys.

 

[Phantom Civic]

50 trim is way to small for 400whp goals. at least a 57 trim, if you want the best turbo gt3076r all the way.

I wouldn't say way too small if he had a .63a/r turbine. You will want to upgrade though so that you won't be blowing so much hot air.

If you don't have the money for a gt series turbo, then a 60trim .63a/r should be a nice size for 400whp on a b18.

 

[jason_guy_yeah]

to4e 57 trim .48 a/r seemed to plot out great.

 

[Phantom Civic]

to4e 57 trim .48 a/r seemed to plot out great.

I personally wouldn't want a .48a/r if I was going for 400.

 

[jason_guy_yeah]

What would you use?

 

[jason_guy_yeah]

I'm having a hard time finding info for determining a/r combos, can anyone clue me in on this?

 

[Phantom Civic]

What would you use?

Personally...

I had a t3/t04e 50trim .48a/r on my d-series. The turbine was a 4bolt and now on my gsr I want to use ac, so Im switching to a 5bolt and upgrading to a .63a/r on the same turbo.

 

[jason_guy_yeah]

Ok, I think I did my calculatons wrong and I think I have it right this time. I'm dying of frustration, by turbobygarret.com equations. I double, triple,... checked. But, I can't find a turbo to match up. Here I'll post up my notes and preasure ratio and lbs/min:

Garrets calculations

How to determine atmospheric preasure

14.7psi = SL2116.224(psf)

Delta = (1-h/145442)^(5.255876)
D= .97915
preasure = SL *Delta
psf= .8951

Convert psf to psi
1/144

.00348592566*2116 then /144
14.6448 psi

Take in account 1 psi depresion
12+12.4/14.6448-1psi =
1.053 preasure ratio

4 valve heads are %95-%99 volmetric effeciency

Going pump gas with 91 octane, .60 BSFC (note: the higher the # the lower the octane).6

So, Wa = A/F*HP*BSFC/60
Wa = 11.5 * 405 * .60/60

46.575 = wa (lb/min)

Calculate manifold preasure

Mapr = Wa*R*(460+Tm)/VE*N/2*Vd

Mapr = 46.575 * (460 +100)/ .99 * 6800/2 *109
R = 639.6 (gas constant)


16682047.2/366894

Mapr = 45.47 -14.7 = boost gauge
boost guage = 30.77 psi

Pr = mapr + ^P
^P = preasure loss from compressor to manifold
Preasure ratio = (45.47 + 2)/13.68 - depending on elevation
pr= 3.47


Plot another point on the compressor map using:

Wa = Map*VE*N/2*Vd
______________
R*(460+Tm)

12265497.5/358176




3.47 Pr/33.59 lbs/min at 5000rpms
3.47 Pr/46.575 lbs/min at 6800rpms