Nytro boost level question

[Skydog]

11.5-12.0

 

[TurboJamie]

The nytro cannot survive over 6 psi of boost on pump gas, without lower compression and or cam timing changes.

I will have to disagree with this. We ran all last season at 8 lbs of boost with no problems on our turbo kit. 11.5:1 a/f ratio with no timing taken out on top end at that boost level. We also did 18 dyno runs at Dynotech wide open for 10 seconds at a time with 180 degree water temps with ZERO problems. Now if you are too lean you will detonate over 6 psi at sea level. If you have the proper fuel pump, fuel pressure, and fuel mapping you can run problem free.

Great conversation here. Above sea level is also a way different game!

I really really played alot with mine 12:1 AFR at WOT in the end and still it ended up detonating. I wonder what the CFM diff is between the turbo and SC? This is good convo last thing I would want to see is someone have to pull the damn engine in that nytro and do pistons etc what a PITA!

 

[Srxspec]

8 lbs boost on our turbo kit is roughly 290 cfm. If we push up around 10 lbs of boost we are roughly 320 cfm which is the max on this charger setup, but 20+ lbs option coming soon!

The superchargers stage 1 max flow is at 311 cfm and is less efficient in the map in that area than our turbo setup. Also the supercharger having the intake behind the intercooler has to affect inlet air temps as well. Possibly hotter intake temps going into the system on the supercharger aiding in detonation?

 

[TurboJamie]

8 lbs boost on our turbo kit is roughly 290 cfm. If we push up around 10 lbs of boost we are roughly 320 cfm which is the max on this charger setup, but 20+ lbs option coming soon!

The superchargers stage 1 max flow is at 311 cfm and is less efficient in the map in that area than our turbo setup. Also the supercharger having the intake behind the intercooler has to affect inlet air temps as well. Possibly hotter intake temps going into the system on the supercharger aiding in detonation?

I beleive that is the BINGO in the SC setup, working harder along with hotter intake temps because of filter location are the causes of detonation. I am a little leary on the nytro as I didn't have the best of luck with running good fuel. I have stepped back from playing with these all togeather and will not be a companies guinnea pig again. I was a complete guinnea pig for MPI last season. Started off needing pulleys they didn't make for low enough boost for pump gas, then not having enough fuel so they gave me the fuel kit, then it was still not enough so they had to fab up a fuel pump kit.

 

[Srxspec]

I beleive that is the BINGO in the SC setup, working harder along with hotter intake temps because of filter location are the causes of detonation. I am a little leary on the nytro as I didn't have the best of luck with running good fuel. I have stepped back from playing with these all togeather and will not be a companies guinnea pig again. I was a complete guinnea pig for MPI last season. Started off needing pulleys they didn't make for low enough boost for pump gas, then not having enough fuel so they gave me the fuel kit, then it was still not enough so they had to fab up a fuel pump kit.

Exactly why we spent a whole season testing before selling anything to the public on our turbo setup. We rode from sea level to 11,000 foot and tried about every combination. Our sea level kit includes an auxillary fuel pump, regulator, etc.

 

[nytrosedude]

MPI Superchargers

I recently purchased a brand new supercharger from MPI for my brand new 2009 NytroSE and they seem to have no idea on what my proper Gem codes should be for riding at roughly 1300ft above sea level....I think turbo Jamie may have some info on this maybe....

 

[resurectedvikin]

hey, all, i'm new here but not to the turbo industry, i have been tuning cars with my time, but i just bought a nytro xtx for this year (used to be a doo lover), so i am going to start playing here...

as relevance to my experience i think that if you are planning on retaining the stock compression ratio and not retarding the timing you should not run leaner than 11.5 at WOT, the richer you run the less chance of detonation, keep charge temperatures as cold as possible too, run an efficient intercooler setup.

i plan on converting my xtx for summer drag and doing something like this, efficient intercooler setup, 6-8psi, retard the timing and run water meth, see what she does on the ashphalt.

good topic, lets keep it up

 

[TurboJamie]

Re: MPI Superchargers

I recently purchased a brand new supercharger from MPI for my brand new 2009 NytroSE and they seem to have no idea on what my proper Gem codes should be for riding at roughly 1300ft above sea level....I think turbo Jamie may have some info on this maybe....

because they screwed around with my fuel so much ie regulator then fuel pump etc... I cannot give any #'s as I was all over the map playing. If you get the kit make damn sure you get the regulator AND the fuel pump upgrade. What pulleys did they give you for sea level?

 

[nytrosedude]

They gave me a 25T top pulley and 29B bottom pulley which are not interchangable ?...they say other sizes are available to obtain a lower boost if req'd but they can't even tell me the boost I should be obtaining with these pulley's...do you know the math formula or anyone else out there ? Also I don't think they offered up the fuel pump kit...did you pay extra for it ?
Ps: I hope you charged Tony for the welding work !

 

[TurboJamie]

Ok your Tony's buddy that I did the bung for tonight with the SE right that custom clown did the install for? Did they clutch that sled at all or anything?

Fuel system is a NECESSITY beleive me that motor will be in a box without it, I probably know more about those kits then anyone. If you do not do the fuel system it will blow. Yes they are charging extra on the damn fuel system, did they do a fuel pressure regulator as well?

The forumal to figure out the SC rpm is all you can use to get close.

Examples are take your gears. 25 and 29 divide the bottom gear by the top = 1.16 gearing ratio

Take RPM x 12.7 which is sc internal gearing x ratio = 125222 sc rpm.

To give you an idea I was playing around with the pulleys. I had a 26t on the top, I beleive the only gear I could get for the bottom was a 30 but you will have to ask tony I cannot remember.

this works out to a sc rpm of 124,000 I know for a fact that that the 124,000 rpm was producting 8+ psi to close to detonation on pump fuel for me.

This is assuming 8500 rpm the only way to decrese boost then is to run less rpm, which would need more gearing to achieve the same top speed at a lower rpm.

 

[Skydog]

Hey buddy were is the rev limit on the Nytro took mine out to night. Love it SICK!! But it is touching the rev limit down low. About 2-3 times then it is good. What is the best way to pull the rpm down a little down low? Need to run on a lake to see where it is up top. But i would bet 8800+ Where do you want it? 8500??

Thank you !!!

 

[Srxspec]

You will need a fuel pump & pressure regulator to get the Nytro to live on pump gas (MPI, or any other turbo kit) at sea level. Above 6-7 psi the stock fuel supply simply isn't enough.

Skydog, rev limiter is 9400 rpm.

 

[TurboJamie]

Hey buddy were is the rev limit on the Nytro took mine out to night. Love it SICK!! But it is touching the rev limit down low. About 2-3 times then it is good. What is the best way to pull the rpm down a little down low? Need to run on a lake to see where it is up top. But i would bet 8800+ Where do you want it? 8500??

Thank you !!!

I beleive the limiter is at 9400 but I can't remember 100% as for where to run it well it depends on how fast you want to go what gearing you want to run and how much boost you want to make.

 

[rxrider]

9400 it is buddy

 

[Skydog]

Thank you guys!

Skydog