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* Alpha Turbo & Side Exh Ordered - What else do I need? *

2585 Views 20 Replies 9 Participants Last post by  iNewton
Few questions for you guys. I'm not very mechanically inclined and have a mechanic friend helping me to install the alpha turbo kit. I'm doing the 9psi wastegate spring so I'll be running a little higher psi than normal and I'm aware there is a risk involved. I'm opting for the alpha side exhaust to keep noise down but see some concerns about heat entering the passenger side and exhaust fumes smell? ECU flash issues? Rough idle or strange performance? Anyone else I should consider when purchasing this kit? Is it necessary to have an air/fuel and boost guage? If so, who makes a reasonably priced kit?

I was also recommended this boost controller. Any thoughts?
SCG-1 Solenoid Boost Controller Gauge

*Thank you in advance!

Eric
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Good choice on a great kit. I am sure you will be fine with the red and natural spring that will put you around 9psi of boost.

You need gauges. Even if they are not the best ones available. You want to monitor your boost levels and AFR to make sure everything is hooked up correctly. I have a set of ASPX gauges that I will sell you for cheap, or go with the AEM Failsafe that has both AFR and Boost in one gauge. The boost controller you listed will do everything you need.

The side exhaust is the best choice. There isn't a bunch more heat from the side exhaust. I am not sure where you are hearing this. Heat will go down when you bail on the stock muffler. The turbo will get hot during aggressive driving, but that is nature of the beast.

There will always be a little bit of smell with these systems because of where the exhaust exits. It isnt that bad and fuel has been taken out of the tune recently to make the smell even less. If you are really worried, experiment on angling the side tip down and away from you; instead of out of the side. (see below pics)

When you buy the kit, you send off your ECM to get the most recent Alpha Stage 2 tune from @MEFIburn (Bob). This tune has been performing really good lately and everyone seems to be really happy. Big shout out to Bob the man!

Not sure what you are hearing about rough idle or strange performance...? Bobs Alpha tune is set to run in open loop and he raises the idle to 1000rpm. Both items should make the vehicle idle smoother. Sometimes you will notice a "rough" like idle in initial startup, but then it will go away. This has to do with programming of the cranking fuel duration I believe. It is nothing to worry about. Other were having some "fuel bog" issues when aggressively short shifting, so Bob adjusted the tune to take out some fuel enrichment.

Again - the tune is looking really good and has been safe for many of us that have been driving the higher boost set-up really hard.

Things I would purchase with the kit....

  • a turbo header - Alpha or the new turbo 1320 - this helps with exhaust flow, performance, looks, etc
  • Stage 8 locking hot side turbo bolts - probably the #1 thing that can come loose. If you install Stage 8s they will never come loose. I believe I bought 5 bolts of the below. Call them to get the right stuff. Great people.
  • #3902 8MM TURBO BOLT KIT
  • Buy and run longer bolts on the header flange and use locking nuts on the opposite side so they will never come loose. (see some pictures below)
  • Then just make sure you have the right gasket maker for the oil pan and exhaust connections






You are going to love the new found power and the quality of the Alpha stuff!

The boost controller you show would be cool. It would replace the need in having an additional AFR and boost gauge. It would all be done with that one product.
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Wow @TravAZ thank you so much that was very informative. Do you think the investment on the alpha headers is worth it? From what I see it only helps out with a few extra horse and is rather expensive. Thank you for the info about the better bolts.. I did hear that its wise to check them often as they can come loose. I will pass this info on to my mechanic.
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The one thing I did was invest in ARP head studs. Just extra insurance. Pretty easy to install yourself, but you will need one special tool to do it to get the correct 155 degree after torque specs
The one thing I did was invest in ARP head studs. Just extra insurance. Pretty easy to install yourself, but you will need one special tool to do it to get the correct 55 degree after torque specs
Hrmm.. I will ask my mechanic to check into this as well.
The one thing I did was invest in ARP head studs. Just extra insurance. Pretty easy to install yourself, but you will need one special tool to do it to get the correct 55 degree after torque specs
+155 degrees after proper torque
ARP head studs are not the same torque as the stock head bolts. ARP recommends tightening the ARP nuts in three equal steps to 80 ft/lbs. Do not torque them to the stock head bolt torque of 22 ft/lbs plus 155 degrees.
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@[email protected]
Dave can you comment on what has been said that what has possibly, again I say possibly, the reason for engine failure is the boost pressure causing the head to lift because of the weak factory head studs this leading to coolant breaching the cyclinders and cracking the sleeve and Pistons? Again this may not be correct. I know Alpha was looking at some that have failed to see where it actually failed, but this was some info that came out of that.
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I for sure would get one of the headers. You will want to do it later and it is a pain in the ass if you don't do it when almost everything is torn apart. Efficiency is improved quite a bit with the header. That stock manifold adapter plate works, but is somewhat restrictive.

ARP Head Studs wouldn't be bad idea either. Great time to take the valve cover off and have it powder coated in the same color as the turbo piping if you are going to go this route. It is really just insurance. So if you want to feel better, I would just install them.

A word of advice - Don't start with the Red and Natural springs in the wastegate. Install just the Red and put a few miles on it (50-300). This will help with break-in of the components and will also leave you more in the "safe" zone while making sure everything is hooked up and working correctly. Some of the people that have blown motors did so because something was hooked up wrong. Once everything looks good, add the natural spring in there and it will add another 1.5 - 2lbs of boost. If you don't do this, just baby is for awhile and watch the gauges closely.

Make sure your gauges are up and running correctly on your initial testing / driving. You should be able to catch bad AFR numbers or high boost to save the motor if you are watching these closely. This could happen if something isn't hooked up right. Like the several people that had wastegate install issues; springs not in there right, hooking boost line to breather valve, etc.

We are referencing boost front the front of the turbo, not on the intake manifold side like the Hahn guys. Make sure your mechanic understands this. Anytime you reference pressure on the manifold side, you will make more boost. We don't necessarily want to be doing that with the header and red + natural springs installed.


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I have read the recamendations , and do not have the money for an after markit Header. Of the other ones !head studs and longer stage 8 for turbo . How hard for the head bolt change. Second , weather proof gauges ?
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Fed Ex will Deliver 16th. Dropping off to Dealer for rear end noise , Then home for a Hart transplant , crinkle red.
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I started to write my version of the turbo install instructions. I will try to get them done today to help you.

Biggest thing to note is if you have a >= 2016.5 (can't speak to the 2016 but easy to check) you have to remove the rear radiator shroud to get the oil pan out. In order to do that you have to remove the radiator. In order to do that you have to remove the sway bar. ;-)

Short version - you will be taking everything from the front of the motor forward off.

The reason for this is to get the oil pan out, you jack up the motor and tranny and slide the oil pan over the steering rack and then drop it down in back. On the new shroud design you can't do that with the shroud and radiator in place - not even close to enough room.

The other thing I would have done differently, that I will be redoing this winter, is installing a bung in the new oil pan for an oil temp probe. iNewton (I believe it was him) noted how to do this in a post of his which I'll find the link to. There is a tapped port in the oil pan you can utilize but the pan has to be off the car to do (all that nasty aluminum shavings you don't want in your oil) :)

I'll work on finishing the install doc today. I've got it about 50% done. There are lots of little gotchya's that if you know about will save you many hours.
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I thank you all in advance for your help. I am a retired US Navy Deep Sea Diver that then survived a MCA the dreaded Left hand turn ,with TBI . Wow what a ride it is. Kept riding two wheels but finely traded over to a 2016.5 SL And now so look forward to this challenge . Your shared experiences are great reading and keep me busy, I wish they sent the instructions early so we could read them. O well Thanks for everything.
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I thank you all in advance for your help. I am a retired US Navy Deep Sea Diver that then survived a MCA the dreaded Left hand turn ,with TBI . Wow what a ride it is. Kept riding two wheels but finely traded over to a 2016.5 SL And now so look forward to this challenge . Your shared experiences are great reading and keep me busy, I wish they sent the instructions early so we could read them. O well Thanks for everything.
You mean the Alpha Turbo install instructions? Go to here and you can download them. I will post my detailed instructions here on the forum today.

Polaris Slingshot Turbo Kit by Alpha Powersport
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You mean the Alpha Turbo install instructions? Go to here and you can download them. I will post my detailed instructions here on the forum today.

Polaris Slingshot Turbo Kit by Alpha Powersport
Awesome @Blitzkrieg that is great. Did you post them here on the forum somewhere? I'd love to read your install notes before we start.
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Awesome @Blitzkrieg that is great. Did you post them here on the forum somewhere? I'd love to read your install notes before we start.
Sorry, life interrupted as it always does. When are you starting your install? One way or another I'll get them done by then. They will help you for sure.
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This weekend if everything is ready to go. You already gave me some good insight a few posts back so I'm very interested to hear what else you have to say lol. I thank you in advance!! =)
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This weekend if everything is ready to go. You already gave me some good insight a few posts back so I'm very interested to hear what else you have to say lol. I thank you in advance!! =)
Okay. If you are starting on 08/20 should not be a problem getting it done at all.
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Awesome. I will be looking forward to it. Please post a link on this thread when its ready.
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I firmly agree with Travss on the header, I had issues with bolts staying tight with the oem manifold using the adapter plate, lots of guys are using them, but it runs much better with the header and no loose bolts.
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