Is this feasible... Garrett GT2871R and 450cc's

[page02wrx]

Yup, looking to put that turbo, onto my CA18DET.

I have an incredible deal on one right now. INCREDIBLE. It would be stupid for me to pass it up, it has about 2k miles on it - the owner has an sr20 and is going with a gt30r.

So..... anybody have an experience with this on their ca18det? Should I go a little higher than 450cc's?

[Logan76]

450's will run out of steam with you.

[page02wrx]

450's will run out of steam with you.

depends on boost/how high i rev

also depends on how efficient the motor is

also depends on horsepower

wondering if anybody has any experience

[The_Chosen_One]

ofcourse you can use the 450cc its just you wont be taking advantage of that turbo because you'll max the injectors running higher boost. That turbo shines in high boost applications.

[float_6969]

You can do it, but it won't be very much fun. The turbo won't really be into it's best efficiency range at the HP level that those injectors will support.

[nismoplsr]

Yea what everyone else is saying. you cant get to much power out of those injectors no matter what turbo you have. That turbo is good for 400hp.

[mikesim]

yea, my band-aid fix for running 440cc's and a GT2530 (GT28R) is using an adjustable fuel pressure regulator and upping the base pressure. i can't imagine using a turbo that can flow 10 lbs/min more than mine with 440's. even 550's are iffy, imo.

[johngriff]

Let me drop some knowledge on you.

Flow rate (lbs/hr) = Max Hp x BSFC / no. injectors x duty cycle

Value of BSFC 0.55 - 0.65 for turbo.

[mikesim]

lbs/hour = [450X0.65]/[4X0.85] lbs/hour = 292 / 3.4lbs/hour = 85.882!

with that calculation, you need 875CC injectors to support 450HP. that's for the worst BSFC possible and 85% duty cycle.

i've always used meggala http://www.meggala.com/injectorscss.htm and just taken into account duty cycle.

cc/min = HP x 5cc/min = 112.5 x 5 (HP per cylinder (450/4) cc/min = 562.5

but that's at 100% DC, so divide by DC. 562/85% (85 is pretty high for top feeds, but side feeds can be driven 100% since they're cooled by the fuel) = 661cc.

it's a huge difference between the two calculations. would you run 675cc or 875cc injectors in a 450HP car? i have one friend with 650's in his 285whp AE and another with 750's in his 417whp SRT-4. who's closer to the ragged edge? i dunno, it depends on the school of thought i guess.

you want to try 450CC injectors? lbs/hour = cc/min / 10.2 = 44

reverse the calculation:44 = HP [X 0.65] / [4x0.85]44 = HP [X 0.65] / 3.444 X 3.4 / 0.65 = HP229 = HP

of course, if our BSFC were closer to 0.55, it would be more like 272 HP, which makes sense since many people use 450CC injectors in 260-300 hp cars. but for your setup, 450cc's are nowhere close.

[page02wrx]

ROGER THAT

So I could use 450's but it wouldn't be any fun

I want to see more than 7-9psi, that would just not be any fun