T
Has anyone installed the MPI turbo upgrade kit (with intercooler etc.) on their viper with the 180hp kit? Would like to get into the 220 hp range, and thinking of installing the upgrade kit and running 10 psi.
MPI turbo upgrade
- Thread starter tcr
- Start date
Your best bet would be to call Ulmer Racing to answer your questions about the MPI upgrade kit. They have done a few for customers.
I'm not sure I'm 100% on-board with running a 2nd control box just for the 4th injector setup though.
I'm not sure I'm 100% on-board with running a 2nd control box just for the 4th injector setup though.
S
If you go over 200 horsepower MAKE SURE you put head studs in. More than a few blew head gaskets in the early days of Viper Turbos.
EDIT - you can get them here,
http://www.evopowersports.com/Head-Stud-Yamaha-Viper-Nytro/dp/B00KCUNPDM?field_availability=-1&field_browse=5145831011&id=Head+Stud+Yamaha+Viper+Nytro&ie=UTF8&refinementHistory=subjectbin&searchBinNameList=subjectbin&searchNodeID=5145831011&searchPage=2&searchRank=salesrank&searchSize=12
M
I've been told by reliable sources that unless you want to run race gas, anything over 190 hp should have a head shim as well.
This is false. You don't need to run head studs until you go over 17lbs of boost on this engine. Countless Nytros ran fine at that level without internal work other than a head shim so they could run pump gas. Look up the impulse kits.
When you go over 17lbs you should do rods and studs and a shim. 200hp happens around 8lbs of boost depending on your setup. imo the only thing you need to do is run higher octane.
I ran my Nytro with no head shim on 15lbs with 110 octane and it ran flawless.
B
if you dont run a shim 6lbs boost is max on 91oct 8lbs at higher elevation & that puts you at 180-190hp.
i run 50/50 110-91oct at 10-12lbs no shim & strait 110 up to 14lbs at elevation,anything above that & you will take out the head gasket.
of coarse these # depend on the elevation you ride,the higher you ride the more you can get away with i ride 4000-6000ft.
S
Ummm...... the Viper has CAT electronics with different timing curves look it up. Viper is out of fuel in stock form at 7 pounds, more than a few found that out the hard way also. This thread on Totallyamaha has 3 people in it lost head gaskets/engine damage - http://www.ty4stroke.com/threads/2015-ltx-with-turbo-blown-head-gasket.135412/
You have to excuse me but I will believe EVO who torture tested the stock head bolts and determined a safe range. Now, that being said the higher altitude you go the safer you are.
EVO is the only turbo builder I know that alters Viper timing to run 210 Horsepower on 91 octane fuel with stock head gasket, and that is why I am putting one on my sled. (210 which is all I plan on running not the 270) is supposed to be safe on stock head bolts but I am putting the studs in just to be safe.
S
Most kits but not all, the EVO kit pulls timing to run stock head gasket and pump gas.
I stand corrected. I was thinking you meant that the boost was lifting the head, not that it was going lean.
Seems crazy that Yamaha would let that go when they sell the 180/190 kit as a factory upgrade.
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