Turbo Compressor maps

[BACARDI_DWB]

Now i was doing some math trying to figure out what turbo would be best for me researching the turbobygarrett website (very helpful btw) and well i found out that when i did the specs for the CA18DET that the flow rating from the begining of boost to redline would be this:flow rating: 23psia@3800rpmflow rating: 42psia@8500RPMand the pressure ratio is3.02now that is at my goal of 400hp at the crankthat is concidering that my numbers (if true) are correct

Target crank HP: 400MAX RPM: 8500intake manifold temps: 130degrees (a guess)Brake specific fuel consumption (BSFC): .60 (another guess)Air fuel ratio (what i shoot for): 11.5 (i should of shot for 11.0)that would give me a actual airflow reading of: 46lb/minmaking my Manifold absolute pressure required to achieve 400hp at sea level: 40.22then add the pressure loss due to intercooler/connectors strech a 2psi loss (a good day)that would make the absolute pressure required to make 400hp 42.22 at sea level. that pressure was determined at 8500rpm's now to save some time and reading the pressure needed at 3800rpm's is 22.89

so my pressure ratio to look at for the compressor maps is 3and my flow to look inbetween is 22.89-42.22. now given i look at this turbo my hp goals are not suited by this turbo correct?http://www.turbobygarrett.com/...5.htm

???????

btw the reason i am shooting for 400 crank is cause that would give me a ball park 20% drive train loss for 320hp at the wheels which is what i am shooting for. 290hp-320 thanks in advance.

edit: i forgot to calculate the pressure ratio at the lower engine speed in my case its 3800rpm would be 1.6 pressure ratio. so now its time to look for some turbo's
Modified by BACARDI_DWB at 7:12 AM 8/24/2006

[BACARDI_DWB]

doing some more research and it seems like this turbo would flow best for my application... any words

http://www.turbobygarrett.com/...2.htm

yeppers i found my turboGT3076R-WG-TURBOits capable of alot more power than i need but it will suit my every need..
Modified by BACARDI_DWB at 8:16 AM 8/24/2006

[Kouks]

I learned something on here, just passing the info on this, please read this....http://www.sdsefi.com/techdyno.htm

Also, a gt2871r will make 320hp@wheels easy, not to mention its one of the fastest turboes to get to it.

320whp=355-360 crank hp.

[c-rad]

I learned something on here, just passing the info on this, please read this....http://www.sdsefi.com/techdyno.htm

Also, a gt2871r will make 320hp@wheels easy, not to mention its one of the fastest turboes to get to it.

320whp=355-360 crank hp.

Yeah, this thread is null. .64 backside 2871R will make 350 to the wheels and the .86 A/R will make close to 400. The .64 will spool right around the 4k mark and the .86 around 4500.

You do NOT want a GT30 series with an internal wastegate. For starters, it still uses the restrictive T2 turbine housing and combined with the internal wastegate you'll be in boost creep city.

[BACARDI_DWB]

so would you recommend moving to a t3 flange with an external wga and keep that GT3076R with a smaller a/r with the external wga? i want fast boost but enough to flow up top. or should i look elsewhere?

[c-rad]

so would you recommend moving to a t3 flange with an external wga and keep that GT3076R with a smaller a/r with the external wga? i want fast boost but enough to flow up top. or should i look elsewhere?

The 3076R is a 500HP turbo. If your goal is 400 crank HP, that is way overkill and the extra lag isn't worth it. If you want to move to a T3 top mount setup, I would go with one of the new ball-bearing T3/T4 50-trims with a .48 A/R backside. That would be a nice mid to high 300whp setup. I just hope you factored your engine build into it.

[BACARDI_DWB]

I learned something on here, just passing the info on this, please read this....http://www.sdsefi.com/techdyno.htm

Also, a gt2871r will make 320hp@wheels easy, not to mention its one of the fastest turboes to get to it.

320whp=355-360 crank hp.

very good article. and a good point. the 2871 was the one i was going to go with originally but i didn't think it flowed up top like i wanted but i think i will end up going with it (thanks c-rad) because if i don't like it then well i can always sell and go bigger.. it should get me what i want.. especially since that drivetrain loss isn't as big as i thought. i don't really want over 350 hp due to the car only weighs 1900lbs thanks again for that find

[c-rad]

i don't really want over 350 hp due to the car only weighs 1900lbs thanks again for that find

wtf kind of car are you putting it in that weighs 1900 pounds? A stripped down Miata?

[BACARDI_DWB]

1970 datsun 510

in standard trim in manual it weighs 1940-1970lbs now mine is completely stripped of all interior and getting lightweight battery/ fiberglass hood/trunk/fenders. small race fuel cell and some coilovers that are lighter than the standard struts. the CA may weigh a little more but still will be offsetted by the other modifications. lexan rear windows also soon to come

[BACARDI_DWB]

and the 6 point roll cage is only 100-120lbs no heavy drum brakes going to calipers all around. leightweight makes up for hp in alot of area's

[Kouks]

CA+gt2871r in a 510, wow, hells yes! Too much fun, just make sure you have a good LSD.

[BACARDI_DWB]

http://www.datsport.com/R200_diff.html

when they come in stock i am pickin one up and if they don't come in stock then i am finding a diff out of a suby STI/WRX if they have the gold tag on the diff cover then its perfect!

[BACARDI_DWB]

i also get this cool service for the turbo that is called:Competition lightening that will take all the excess rotating mass off the turbo and make it spool up 4 to 5 tenths of a second faster. its free for me but my vendor charges 149+ shipping here is the link if your interested.

http://www.srtforums.com/forum...ening