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Help With Turbo Choice..

Old 02-17-2005, 10:57 PM
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I need to pick a turbo for my sandrail project. I will be using a 93 13b 4 port. There will be no intake porting, but probably some minor exhaust porting. I am shooting for 400rwhp @ 15lbs. The most important thing I need is a very fast spool up. This car will be in sand most of its life, and very rarely over 100mph. Trying to kep the rpm to 7500-8000 max.

Please let me know of potential problems with this, and what turbo I should be looking for.

Thanks.

Phil
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Old 02-18-2005, 12:26 AM
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how do you keep sand out of the motor/intake.......?
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Old 02-18-2005, 01:00 AM
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Originally Posted by vosko' date='Feb 17 2005, 10:26 PM
how do you keep sand out of the motor/intake.......?



Wouldn't a filter just do the trick?
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Old 02-18-2005, 06:17 AM
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T04S would do just fine.



get the .96 or 1.0 a/r exhaust
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Old 02-18-2005, 08:36 AM
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Why no intake porting? Wouldn't porting in general help with spool?

(i.e. More air in=More air out)
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Old 02-18-2005, 09:27 AM
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Originally Posted by rfreeman27' date='Feb 18 2005, 04:17 AM
T04S would do just fine.



get the .96 or 1.0 a/r exhaust

Whats a to4S? I know the b's and e's.



As for sand, a good filter, combined with the pre filters made keeps sand out.



Porting - main reason for no porting is I want to keep the rpm down. Since porting the rotary is like putting a bigger cam in a piston engine, it would increase duration and most likely overlap. Both of which I dont want to increase for the effect on rpm.

Please correct me if I am wrong on this. I know my piston engines inside and out, but the details of rotaries I'm not sure I have yet.



Thanks.
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Old 02-18-2005, 03:53 PM
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400 wheels at 15 psi? take a look at the 60-1 off of rotary extreme. Should be sufficient for your goals with nice spool.
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Old 02-19-2005, 02:51 PM
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Because if you arent porting the motor you are going to need the bigger t04s to make 400rwhp at 15lbs of boost.



I made ~400 with stock ports with a XS t04s kit.
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Old 02-19-2005, 11:29 PM
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Originally Posted by rfreeman27' date='Feb 19 2005, 12:51 PM
Because if you arent porting the motor you are going to need the bigger t04s to make 400rwhp at 15lbs of boost.



I made ~400 with stock ports with a XS t04s kit.



why the recommendations for such large a/r? I would think a .68-.85 a/r would be better for quick spool up.

Thanks again.

Phil
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Old 02-20-2005, 03:36 PM
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You could use a smaller A/R if you wanted because you arent looking for something to breathe at higher RPM. If you are spending any time over 6000rpm I would go with a larger A/R.



lag is overrated. These things rev so quick that you wolnt notice, as long as you are in the correct gear.
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