60mm vs 70 vs 76, which is best for said CI? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 10-12-2007, 01:13 AM Thread Starter
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60mm vs 70 vs 76, which is best for said CI?

Just doing some figures for the next project. I know about NA stuff somewhat, I know about superchargers somewhat, I dont know to much about turbos. I havnt seen enough/read enough examples to help figure it out. Ok, we got small turbos, 60mm turbos, 66, 70, 76 and bigger. I am gonna use the 302/306-331/347 for examples.

Say you have the trick flow heads stage one cam, track heat intake on a 306.If you bolt up a 60mm turbo, it makes its power throughout a certain rpm. If the same motor has a 76 turbo on it, it would make as much low end but would come on higher. What Im getting at, is what size turbo is good for said cubic inches? What is the powerband? Would a 76 be to big for a 302/306?

Shine some light on me with some info/dyno sheets if you would.


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post #2 of 7 Old 10-12-2007, 02:43 AM
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I feel sorry for whoever tries to answer all of this lol...

Just try to select a turbo for the combo you are going for.. Decide the max rpm you want.. how much power you want... generaly a 302 likes a 66 to a 70.. 66 if your not wanting to go to crazy 70 if you want ot push it.. 76 is more for a 331 347 IMO. I have seen a 302 go 9's with a 76 though... I belive with a stock longblock. To me its mostly about the power you want and if you want to grow or stay where your at.


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post #3 of 7 Old 10-12-2007, 03:44 AM Thread Starter
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I was mainly looking to see where it all fit.

But for my combo I would be building, it would be a 302/306 with say some trick flow heads, cam and intake. Wouldnt want to go past 6000rpm. I have been reading that many are making 45-550 rwhp with alike combos with a 60-70mm turbo. I am sure its hard with this sort of power to not melt your tires.

The next project is a little ways off, but Id like it to run 130 or about in the 1/4. Plan to keep it street-able. I have talked with a few who know their stuff with blowers, and I am guessing it is very similiar to turbos, just dont require as much rpm.

-92GT stock w/39k miles
-91LX aod/white hatch
-2011 GT A6/brenspeed/kooks/dynotech/roush tvs
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post #4 of 7 Old 10-12-2007, 05:29 AM
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This is EXACTLY what Im wanting to know too. I will be using a new Boss block either 306 or 321 so I dont have to worry about that part of the new motor if I want to get crazy someday, but for now I just want to have 475-500 rwhp and about 600 tq. That would be nice in a Lentech AOD.

I am probably going to go with the QuickTime base kit w/ the 66mm Precision ball bearing turbo upgrade, but I see that featured Fox in the new MMFF mag that is running the base HP kit with just a 60 or 62mm. It is making 500+ and 622tq. Very nice there, so I guess a smaller turbo is just as good at making quicker power than the larger one.

I would like full boost by 3000-3200.

1996 Cobra. Laser Red. 4.10's. BBK LT's & H along with MagnaFlows, JLT CAI and Steeda underdrives. 273/272 SAE w/ 91 CA octane. (Father's car now)

2003 Mach 1. White. 4.30's, MRT O/R H, SLP LM2, JLT CAI, PHP intake spacer, XCal2. 286/315
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post #5 of 7 Old 10-12-2007, 10:13 AM
 
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I would go 63mil because my 70 starts spooling around 3600 rpms and a 63 will start at 2000 and be full spool at 2800-3000! imo
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post #6 of 7 Old 10-12-2007, 03:30 PM
 
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I have a Quicktime kit w/mp70 and it starts spooling under 2000 rpm, and full boost under 2500 rpm.
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post #7 of 7 Old 10-12-2007, 05:38 PM
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that is quick

Quote:
Originally Posted by 05xterra View Post
I have a Quicktime kit w/mp70 and it starts spooling under 2000 rpm, and full boost under 2500 rpm.
What size motor are you running?

1996 Cobra. Laser Red. 4.10's. BBK LT's & H along with MagnaFlows, JLT CAI and Steeda underdrives. 273/272 SAE w/ 91 CA octane. (Father's car now)

2003 Mach 1. White. 4.30's, MRT O/R H, SLP LM2, JLT CAI, PHP intake spacer, XCal2. 286/315
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