turbo sizing

[Carlriddle]

Doing some more planing just incase a deal falls in my lap.    Got a few things to move and I dont want to move twice, so??  I'm going to put a turbo on the 12r, prob only 8-10lbs as that seems to be very safe for the stock insides.  With an intercooler should be in the 250hp range.
Now the ? ? ?'s  Had a couple places rec a nice td04l-13t.  Small turbo from several cars, but when I do the formula calculations I found online it falls on the lower side of the compressor map.  Where have you found info for stuff you've used or did you just do what some else said, LOL?

zx12 8-10lbs boost

What/where formula you use?

[fabr]

Using a busa made it easy.  Many people have done it and there's a boatload of info available. I use a Garrett GT25R ball bearing turbo. Some  may say a BB turbo is not necessary. It isn't BUT a huge plus in reduced spool time.For our purposes ALWAYS err on the side of too small. Too big will spool up too late. IMO full boost needs to be reached by about 4000-4500rpm on a bike powered car.

[Carlriddle]

I do want ball bearing.  12 revs 1k higher than busa but I was thinking full boost by 6k?  Max torq at 7500k.  Several turboed 12's but little info as to turbo size and the ones that do are using big ass turbos and making 400+ hp but with motor work.  While I give up 100 cc to a busa turbo sizing should be close. When doing the math; long drawn out way useing volumn of air X pressure X hp divided rpm and some other stuff it plots on the lower R of comp map. Right in sweet spot just low.  Does that mean turbo will be good for 25lbs, yep, but is it too big for current wants w/o going in motor. Want to stay with pump gas, maybe a little 108 blend for something crazy!!

[fabr]

I do want ball bearing.  12 revs 1k higher than busa but I was thinking full boost by 6k?  Max torq at 7500k.  Several turboed 12's but little info as to turbo size and the ones that do are using big ass turbos and making 400+ hp but with motor work.  While I give up 100 cc to a busa turbo sizing should be close. When doing the math; long drawn out way useing volumn of air X pressure X hp divided rpm and some other stuff it plots on the lower R of comp map. Right in sweet spot just low.  Does that mean turbo will be good for 25lbs, yep, but is it too big for current wants w/o going in motor. Want to stay with pump gas, maybe a little 108 blend for something crazy!!

Too big a hair dryer will not make boost soon enough for good drivability,IMO. If you are not making full boost till 6K you will be disappointed,IMO. You would be well served by an off the shelf GT25R or equivalent.

[Carlriddle]

Ill hunt up a map for the gt25 tomm and see how that plays.

[fabr]

remember that there are different trims available  also that alter the maps.

[MC]

Ball bearing turbos are the ONLY way to go. I used a IHI race turbo, old Nissan stuff, on my 2332 VW motor and LOVED IT!! Ran it on alky, LOVES IT.

I would not try to run on pump gas, I cant believe how many people Want to make Power but are to CHEAP to buy race gas and then complain when it all goes bad. You have a lot of compression and timing.....................The compression is actually good, allows you to run the boast to a lower number and helps keeps the bottom end power good.

If I were running a turbo I would run E85, cheap and like alky turbos love it. You would need to double your injector size. Leaving the stock injectors in place and doing a set of top injectors in the plenum would be would be the best way to go, again using E85.

Turbos make power, no question, however like everything else the better the package the better its going to work.

[fabr]

8#'s is just fine on 91 pump gas. 10 psi is good with a good tune. Don't let it lean out above 8. Actually,IMO ,the Hahn portfueler is the slickest/easiest way to add supplemental fueling. Not in any way knocking the use of E85 other than availability. 

[Carlriddle]

 Back to top. Found a steal on a Garrett gt1752. Little baby dryer but will make easy 10lbs by 5k. But at redline it outside the turbo map. This is if I know what I'm doing which is highly suspect as its after 5 on fri 13th. Lol
It will start boost at 2500 rpm, just concerned with overspinning it.

[fabr]

You will find out.I'm skeptical if it is a good choice. WHat have you read about turboing your engine?

[Carlriddle]

Only ones with detail of turbo where a mitsi td04-13/14 and a gt28. But those two where making 400hp. You said I couldn't go to small . It wouldn't make over 14lbs ever and I couldn't without motor work.

[fabr]

Your calcs show it not to be a good choice,Carl. Why try it? The turbo won't like it. Honestly for your high revving motor,having full boost not until maybe 6-7K would be just fine.

[Carlriddle]

Ok so I picked up this little turbo yest.  Its basically a gt20 with a diff comp side.  Garrett put it togther for a sabb 9.3 and 9.5 2 liter engine.  It will be rebuilt over the winter for an instal. 

I used info on 3 diff places to plot on the turbo map I found for it, I got 3 diff answers.
No time now, off to insulate trailer for trip...................

[dsrace]

Ok so I picked up this little turbo yest.  Its basically a gt20 with a diff comp side.  Garrett put it togther for a sabb 9.3 and 9.5 2 liter engine.  It will be rebuilt over the winter for an instal. 

I used info on 3 diff places to plot on the turbo map I found for it, I got 3 diff answers.
No time now, off to insulate trailer for trip...................

so ....turbo hmmmmm.........enemy finally got to ya huh....

[Carlriddle]

Only 98% enemy's fault.