i got the turbo for my compound set up today

[nwnsc]

what do you guys think? http://i296.photobucket.com/albums/mm191/nwnsc/06-05-08_2249-1.jpg http://i296.photobucket.com/albums/mm191/nwnsc/06-05-08_2251.jpg http://i296.photobucket.com/albums/mm191/nwnsc/06-05-08_2252-1.jpg http://i296.photobucket.com/albums/mm191/nwnsc/06-05-08_2256.jpg

[Hock]

Whats the specs?

[David Neibert]

From the size of that exhaust housing (very large compared to compressor), it looks like something off of a diesel.

David

[ricardoa1]

Thats a start.:D

[tim-g]

From the size of that exhaust housing (very large compared to compressor), it looks like something off of a diesel.

David

smarty pants

[Mike8675309]

yep, that's a turbo alright!

Looks like the start to a fun project.

[nwnsc]

it's off a gm 6.5 diesel. im makeing the headers right now. everything siad go big with the turbo when i researched it.

[Mike8675309]

ah.. that's not entirely correct. Not go big all over. Just go big with the A/R for the turbine housing. Do you know what the A/R for that unit is?

Did some math for myself as I am starting to collect some parts and posted the math and details for my thoughts in this thread:
http://www.sccoa.com/forums/showthread.php?t=84587&highlight=twincharging Post #19 has the beginnings of me calculating the numbers. Basically setting a target HP, then backing things out from there to get air flow needs, and figuring out blower drive and such.
This thread can help with such calculations
http://www.eng-tips.com/viewthread.cfm?qid=173617&page=10

You will want to do the math, or you'll find yourself out of the sweet spot of the turbo. I.e. for my 700rwhp calc and the stock M90 running about 1:1 I want a turbo that can handle a mass flow rate of 21.3, with a Pressure Ratio of 1.67. This turbo would work nicely:
http://www.turbobygarrett.com/turbobygarrett/images/catalog/Turbochargers/gt35_images/GT3582R_714568_2_comp_e.gif

[nwnsc]

i have read those threads when i was researching this and showed them to my friends that bulid turbo kits around here. this is the turbo they recomended to me. i just got done with jammie's 29 dodge and he gave this as a thank you to help me get this started. thank you for puting that info out there as it has helped me plain how to do this. if some q's come up do you mind if i pick your brain a little?

[nwnsc]

where do i find a map for a holset assy. 3531456 type h1c customer 353150-0-2/3 is what the tag said

[Hock]

Well maybe one of you two could help me out with the math, its a little over my head. THis is a project I've been wanting to do for over 5 years and have not been able to get help in figuring out what size turbo to go with.

I was thinking maybe a T3/T4 .60 A/R Comp and a 1.15 A/R Turbine. I think that would keep it from spooling until about 2500-3000rpm and still be able to push enough air to over feed to S/C.

[Phillio99]

holset maps are hard to come by

[Mike8675309]

Well maybe one of you two could help me out with the math, its a little over my head. THis is a project I've been wanting to do for over 5 years and have not been able to get help in figuring out what size turbo to go with.

I was thinking maybe a T3/T4 .60 A/R Comp and a 1.15 A/R Turbine. I think that would keep it from spooling until about 2500-3000rpm and still be able to push enough air to over feed to S/C.

Start with how much power you want and you work the calculations from there. Note in that chart I included, I was going to go for their 1.06AR version of the unit.

The key here is that due to the supercharger being involved, the compressor side will get more air flow for less turbine side size than typically. The compressor will have more airflow out for each crank revolution than if on a N/A car, so to keep from using up the turbo to soon, you want the turbine side a little looser, thus brining the turbo to spool later in the RPM range than if you went with a smaller turbine housing. Either way, the turbine will spool quite fast due to this extra air from the blower.

That handles the turbine sizing, but to size the compressor section you need to figure out how much air you're going to move at the top end (basically how much HP you want = how much air you must move) You figure out the Hp you want, then figure out the airflow that needs. Then you figure out the pressure rise necessary to achieve that with your engine displacement at a target RPM. Have the blower take care of 1/2 the pressure rise, and then the turbo can take care fo the rest. Have the blower waste gate indexed off the pressure after the blower so the turbo then is responsible for all make up pressure.

See post #19 in the thread linked above. I went through the calculations. I'll take what I did and stick it into a google doc spreadsheet and see if I can share it later this weekend. then you can plug in numbers and simplify the math.

[Jim Demmitt Jr]

Looking good!


Your setup you talked to me about is going to be "BIG POWER" cant waite to see you get it together soon

[tim-g]

any update

[Young-SC-Owner]

Looking good!


Your setup you talked to me about is going to be "BIG POWER" cant waite to see you get it together soon

You gonna run 9's with that setup:eek:

[nwnsc]

haven't got much done on the ehaust since i have been realy busy with finshing the 29 dodge and then starting at the hotrod shop. wanting to get the right header cut, fit and tacked up this weekend if i can find the time. Young-SC-Owner You gonna run 9's with that setup not looking to be the fastest sc just got a few mustangs and hondas to murder.:D

[Young-SC-Owner]

That will be homicide

[Jim Demmitt Jr]

nwnsc

How is your project comming along? I am tracking down one of my dads old racing friends that ran the Turbocharger AA/FC in the the 70's with a KB 492ci hemi with twin turbos and supercharged. He did build a twin turbo V6 Buick with small blower hope he can give you info on your project

I will PM you after I get in contact with him I like your ideas and your goals on this its so differaint and well planed out

[nwnsc]

well i got a smaller ehaust housing for the turbo. it came with 18cm and i got a 12cm with internal wastegate to hellp spool time. want it at full boost right off the line. it is going to be a street car so low end power is my goal. probly going e85 with it. im doing it on the 90 auto i have but it is geting a 5 speed. right now i have the car in the garage with the motor, trany and every thing apart. have a 50,000mi botom end to go in wance the soild motor mounts are done. got all the peices to finsh the ehaust, just haven't had time to cut and fit them. trying to get the anny back to stock to sell to help fund this thang.lol lower intake is ready to weld back up. the cumins intercooler is geting cut down to size and end tanks made by rusty's total performance, just have to do some work on his comet to pay for it. have a few freinds comeing over to help every now and then. between work, kids and side jobs time to work on it is geting hard to come by. hope to have it all put together by the end of summer. a lot of the parts are comeing by trade so that takes some time to mud and paint but for the price it's worth it. i will keep you posted as things come together.

[tim-g]

any update?:D