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- 2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
- LOCATION
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Your trail setup isn't running at only 4.5 lbs of boost, unless you are at absolute sea level (0 elevation), then you are running 4.5 lbs of boost. The trail kit with the electronic boost controller, adjusts the boost up and down for elevation changes. I'm at about 1300-1400 foot elevation and the boost is 5.3 psi at my elevation on the trail kit.
Now you will notice cooler intake temps as well as the quick spool wastegate making a difference as well.
- Joined
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- 5,347
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- 2014 Yamaha SR Viper LTX, 2014 Yamaha SR Viper RTX SE, 2015 Yamaha SR Viper MTX SE 162 (turbo), 2015 Yamaha SR Viper MTX SE 153
- LOCATION
- Menno, SD
- WEBSITE
- www.ulmerracing.com
Also, on the MPI kit, at 5.5 to 6 psi it makes just a little over 10 hp per pound of boost with the stock MPI quiet muffler, but turn that up to 8 psi with the stock quiet MPI muffler and you're down to about 7 hp per pound of boost.
MIDWAY
Extreme
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- SE, MN
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- 2015 Yamaha Viper LTX SE with Push Turbo
Take it from me, DO NOT run 7 lbs and DO NOT run turbo without gauges!!
stingray719
TY 4 Stroke God
MIDWAY
Extreme
- Joined
- Feb 12, 2008
- Messages
- 107
- Location
- SE, MN
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- 2015 Yamaha Viper LTX SE with Push Turbo
Definitely don't blame the sled but definitely blame the guy who sold me the Turbo, set it up, and told me not to run gauges! Also told me you can safely run 7 lbs of boost with stock injectors!!!
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- 2020 Sidewinder SRX
I agree 100%
Well at least he was consistent
Hey at least you did not have happen what happened to Yamahatim!!! Hauck was riding his tuning the clutching when it blew up then said it was not going to be covered because the AFR gauge was not working right. (Hauck sold it to him and installed the gauge)
Studroes144
TY 4 Stroke God
Well at least he was consistent
Hey at least you did not have happen what happened to Yamahatim!!! Hauck was riding his tuning the clutching when it blew up then said it was not going to be covered because the AFR gauge was not working right. (Hauck sold it to him and installed the gauge)
That's the main reason I'm ditching the aem gauges for next year, I just haven't had good luck with mine, they're like a magnet to moisture..and since my boost gauge went all haywire I'm sure the afr gauge isn't too far behind.
Ye4s I am on my 3rd boost gauge and it failed at the end of the season. I even made a gasket for the face plate after washing the sled and having to pull it and dry it out. The AEM is getting swapped out for the one on my muscle car. It is still AEM but is a marine unit made to withstand salt and water.
The real culprit on Tim's was a KOSO I believe even Mr Sled had a bad one 2 yrs ago on his viper.
The real culprit on Tim's was a KOSO I believe even Mr Sled had a bad one 2 yrs ago on his viper.
Studroes144
TY 4 Stroke God
Most all the turbo guys I know use a Garrett boost gauge and have used them for years with no moisture issues, so I have one of those to put on and also an afr500 gauge from ballenger motorsports, it's expensive, but u get what u pay for. The digital readout on it has numbers that are really bright and about an inch tall so you can see them no problem even on the brightest days. Good gauges are much cheaper than an engine rebuild. Either way, 7 pounds on a stock engine I don't think is really pushing it, but 7 pounds with stock fuel pump and injectors is just crazy, I could hardly run mine at 5 pounds and trust it to hold it for any real distance. I don't have any interest in holding mine for more than a 1/4 mile, even in that distance the speeds are crazy fast for a trail machine, but at 5 pounds with my gems controller maxed out the afr's would climb a somewhat steady rate and after an 1/8th of a mile I didn't feel safe holding it anymore with the fear of running lean
STAIN
Lifetime Member
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- 2022 SIDEWINDER LTX GT
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The only problem I have with my AEM gauges is seeing them at speed. I have been wondering about some larger gauges or some analog ones
Reading them is hard and I tried several times to video them but the frame rate vs the refresh rate of the gauge is off and nothing but blinky lights show up. What I can see is my temp light keeps blinking on and off on the dash. Not sure why cause at shut off it was reading 170 Deg.
And I do not know why - when I posted this it was crystal clear now it has degraded - Maybe someone did not like the 102 mph on the speedo
And I do not know why - when I posted this it was crystal clear now it has degraded - Maybe someone did not like the 102 mph on the speedo
kviper
VIP Member
I have an AEM AFR gauge that has been flaw less and a AEM true boost gauge/boost controller. It also has been flawless but the boost gauge is very hard to read at speed. So i put a analog boost gauge on and just use the true boost to control boost.
