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max boost for nytro with stock motor

L

lightening800

Well-known member
tried to do a search but came up with nothing so just a simple question, how much boost [safely] with stock motor with 50/50 c12 or 110. i have had it to 10psi with 91 pump in altitude with no issues and am going to 12 with 50/50 or ave gas is 12 the max for this engine safely with no head shim? thanks for your inputs. Dwayne
 
With the smaller turbo GT25 your charge temps are going to be a bit higher as well. Not sure I was told without a shim 12lbs would be max with Av gas.
 
turbo

i think the gt25 is a perfect match for that 3 cyl motor, it doesnt even hiccup or nothing with that turbo, its capable of plenty boost for that motor and i like the manners of the 2554 garret for throttle response and spool up. you say the gt25 is little but i seem to remember that all the rx1 and apexs were running them and were plenty turbo for many people. just my .02
 
After 12 lbs on the gt 25 with the apex and nytro is starts to fall off its efficiency range gets to hot if you want to run bitter boost you would be better off with a 2560 or a 2860 with the small exaust housing on it
 
dont know how this got to a turbo topic but i would say 17 or 18 lbs with c 16 straight or13, 14 straight c12. so far with those #'s no issues.
 
dont know how this got to a turbo topic

I would say that the two issues are related to each other.

Different turbos run at different points in their efficiency curves (I dont remember the correct name for this) so for a smaller turbo, which must be what Lightening800 is using, the turbo will create more heat as the boost increases. A larger turbo will generally operate more efficiently at higher boost numbers, therefore lower intake temps into the cylinders and so you can run pump gas with a higher boost pressure. Of course this theory goes all to hell with elevation changes, intercooler size, timing setup, etc. etc. etc.
 
i think the gt25 is a perfect match for that 3 cyl motor, it doesnt even hiccup or nothing with that turbo, its capable of plenty boost for that motor and i like the manners of the 2554 garret for throttle response and spool up. you say the gt25 is little but i seem to remember that all the rx1 and apexs were running them and were plenty turbo for many people. just my .02

nothing wrong with the 2554 works great ran one for a couple years but compared to a 28rs with the 64 a/r housing you will not notice the diff in throttle response & at 12bls on both turbos the 28 will walk away from the 25.oh & what mike said, i would say 17-18 on stock motor no more but like he said you need some expensive gas.:eek:
 
boost

thanks for the straight up answers, i was thinking 14ish with pure c110 would be safe just wasent sure but obviously it would be ok.
 
any idea what hp 13,14lbs offers, gets a bit exspensive running c16, barrel of c12 can hit the pocket book as well after a while


dont know how this got to a turbo topic but i would say 17 or 18 lbs with c 16 straight or13, 14 straight c12. so far with those #'s no issues.
 
You seem to have alot of knowledge about fuel systems. 280hp at 14lbs sounds like alot of power.?.

sea level or ????????

Pretty sure all the tests were done at sea level.

I am looking to make my way over to team blue this summer so I have been doing research of all the different turbo options out there.

As for my knowledge it all comes from building my car.
 
You seem to have alot of knowledge about fuel systems. 280hp at 14lbs sounds like alot of power.?.

sea level or ????????

that is at sea level with cam timing & shim & the rapid bike 3 box.without the shim it should be pushing closer to 300hp.
 
hp

im going to guess here but my setup at 10psi shoulb be around 200hp, 12psi around 220hp and 14ish around 240hp, what do you gus think am i close with no headshim???
 
Your horsepower will vary with many things. Turbo efficiency, elevation, etc. At sea level with no headshim, I would think 14 lbs would yield around 300 hp, you better be running good fuel though. I run my Nytro between 16-18 lbs boost with half C-12 and premium. Alpine kit with headshim.
 
I think the numbers are starting to get a little optimistic here. A stock, naturally aspirated Nytro makes approx. 135 HP (depending on the dyno) at sea level which is under 14.7 psi of atmoshperic pressure. If a turbo kit was 100% efficient, which they aren't, then the motor should theoretically double its power at 14.7 pounds of boost. With the loss of efficieny taken into account, it typically takes approx. 16-17 lbs. of boost to double a motor's output. i.e. the MCX Apex kit @ 17 lbs. of boost makes approx. 310 HP. (150 HP x 2) would probably be close to 16 lbs.

According to their website, MCXpress has dynoed their Nytro kit @ 260 hp running 15 lbs of boost which is also consistent with the typical 16-17 lbs doubling the motors output (270-276 hp).

Not that it matters much it will still be kicking a$$ on all the 2-smokers.:D
 
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