Posts by Casey_SS

Attention Vendors. Please email robert@rabtech.com any instruction manuals you may have for your products. They will be added to the FILEBASE tab for members to access.

    The only sputtering I've experienced with my Hahn Stage 2 turbo system was some occasional sputtering under hard acceleration starting at 4000 rpms. It also seemed to occur when the gas tank was about half-full or less, so I feared a fuel pump problem. After running 2-3 cans of Sea foam over 4-6 fill-ups, the sputtering cleared up, so I guess the gas filter was a little clogged and the Sea Foam cleared it out.

    Compared to AFR numbers I've seen others post, my AFR readings have always seemed a little high, with idle AFRs around 15-16 and going as high as 20-22 when I take my foot off the gas, but dropping down to 11-13 under hard acceleration.

    Good Luck in sorting things out.

    Those number seem good, stoichiometric ratio for gasoline is 14.7:1 so in close loop you should be bouncing around 14 to 15 or so. Foot off throttle with high vacuum is normal numbers. as well.


    11-13 under acceleration is also good. Getting down to 10 would be very rich, above 13 would be getting to lean under WOT, lean blows motors.

    Lean is mean, but rich is a bitch.

    Now the question is, are they making any adjustments and if so, to the piggyback? Are you in stage 2x for that? I would think not. I believe Bill claimed 250 HP at the wheel. DDM was saying they were getting on average 12.5 HP for each PSI of boost. Bills was pushing peak of 8 for the stage 1, so that "should" give you between 80-100 HP added to the machine. I believe stock is 176... I think... So it should be a peak of 256-276HP at the wheel. My take is that Bill may have been on the "safe" side and probably didn't put that much time into the tune... don't know that, but a hunch. If you put stage 2, it will push it to just under 10, so should add another 20-25HP. I was hoping that someone could verify Bills tune.

    I can't see the entire graph, but looks like the stock is coming in at just under 150HP at the wheel? Is that the case? If that is true, then the system is pushing an added 90HP, so 11.25/PSI. Almost what DDM was claiming. This is all assuming you are at stage 1 though.


    Thanks for the info!

    Which AEM FIC tune file was used for the posted Dyno graph?
    There was the original tune and a modified tune file that I pushed Bill hard to get done.

    2 questions please...


    The people that are running the Stoptech big brakes how do you like them?


    Does anybody know the individual Stoptech part numbers that make up the kits??
    Specifically:

    • Front rotor part numbers
    • Front caliper part numbers
    • Front pad part numbers
    • Rear rotor part number
    • Rear pad part numbers
    • Any other parts that would be needed

    Your poll selection has been added

    Just finished up installing the DDM supercharger today on my 16.5. I have about 100 miles on it so far. Quick question for you supercharger guys. Is it normal that the cockpit temps significantly increase after the install? Did the removal of the rear radiator shroud effect this? Also, I know the ECU is still learning but I am getting a sort of fluttering sound from the exhaust at idle. Just trying to figure out what is normal and what is not? New to the world of boost. Also like to thank @Casey_SS for all his help with the Install. @TravAZ and @Ghost had me covered with all the pre install questions. I sincerely appreciate it guys. Thank you.


    @NJ SS determined his sling was asthmatic and needed breathing assistance


    The picture below is prior to the surgical implantation of the Rotrex fire breathing apparatus.
    Surgery was performed in @Casey_SS Operating Room!



    I have put my install on hold until I can line up my installer which might be in October. Riding season will be hit and miss at this time of year so if I'm missing some parts or have problems with the install i'm not losing much riding time. I hope your turbo is working out for you. Did you get the Haltech?

    No Haltech, Turbo is running fine I'm still at 2 power level, @SaltyClownNY has switched to 2x


    I feel sorry that you are still not installed, nor do you really know if you have everything to complete the installation.

    Question on my side of things...would this reduce the amount of fuel (or is it controlled by the ecu?)...essentially reducing fumes? One of the local guys here running a DDM supercharger is looking to go to smaller injectors because he thinks he is getting too much fuel.

    @Br4hm4
    I would not in any way use the smell of fumes as a guide to reducing your injectors to a smaller size!!!
    YOU WILL BLOW YOUR MOTOR!!!


    Rich is a bitch, lean is mean!


    Rich hesitates, makes less power then optimal, flounders, stalls out, think of your lawn mower and you flood it by keeping the choke on too long, then you have to open the throttle wide open and crank out the extra fuel because it's flooded. Thats rich, thats a bitch


    Lean is mean makes lots of power, but going too lean will burn your pistons, burn your valves etc and blow your engine.


    In my opinion: The canned tune you receive and or load up is running slightly rich. Rich will not blow your motor(within reason), lean will. As @TravAZ states above. Slight changes to your setup can change how rich/lean your engine is running. As far as I know, there has not been any evidence that the ECU tune has blown anyone's motor, because it's tune slightly rich. By tuning that way, if you make a change it is less likely to blow your motor.


    If you or "one of the local guys" want's to get an idea of what is going on, follow the advice from @rabtech and other, get a WBFS gauge and learn it. At which point you can make an educated guess with is driven by actual data and not your nose.


    With that data, you can then decide if you want to have a custom tune done specific to your slingshot.


    I hope this helps


    If I've gone off topic I apologize, I just could not leave that comment out there without responding to use your nose to tune an engine, it will result in disaster.

    thats interesting to know. I have never had mine on a track and I have never really tried to see how fast it could go, but I have hit 100 very easily on local roads and it always seems like it could easily go much faster when I let off
    I have read that they have the top speed limited, but I do not know if that is true or just speculation

    The 115 MPH was not the top speed of the N/A sling. I believe it was the top speed on that course before he ran out of straightaway and had to turn and let off.


    His point, the charged sling accelerated faster in the same distance to get to the speeds you see in the video.

    I believe Bill stated the 250 HP was at 6# of boost, we should be I believe at the 2 level around 275 HP with 7.5# at least that is what I'm getting pressure wise.
    2x will move the pressure up to 8.5ish I believe.


    From what I've been lead to believe from my research it's not a 1/4 machine with 1 wheel in the back. @StickerDick I believe runs 1/2 mile drag strip. He's also running a 345 rear


    @FunCycle, Dave gave a post some time ago where the vendors are comparing each others systems. I agree that it's hard to do and in some ways, the vendors are putting their own system in the best light and working to discredit the other brands out there, so can be a bit misleading. My take away from Dave's comments was that there is a standards for measuring the system on the dyne and that they both have to be using the same standards. I would think it would be close.


    @Ghost LOL... Yes, there are a LOT of ways to do myself off. The key is that with my current setup, I'd like to get what I can out of it. The Hahn setup wasn't cheep all on it's own. If I'm at 250HP at the wheel now, is it possible to get to 275HP or even 300HP on the stock engine. I really have no desire to be at 1000HP, but I would like to get the most out of what I did purchase and at the moment, I don't feel as though that is the case. The system I know is capable of more, but when is it too much for the stock engine I don't know.


    Maybe @Dave@DDMWorks has some insight as to approximately how many pounds of boost in a turbo equals appropriately how many HP?


    I also believe that superchargers making their max boost at the top of the RPM range is also much easier on the engine then making that same pressure at a lower RPM like you can with a turbo. Lugging the engine and getting lots of boost pressure at lower RPM's; your just begging to blow your engine.


    Care to comment @Dave@DDMWorks?

    Bill has no camp as far as I know, what staff he did have are gone. Nobody when he did have staff ever answered the phone. Well that's not entirely true. His wife answered the phone once. She gave me her cell so when something that needed prompt attention, I would call her. Instead of Bill, when he would not answer my calls.


    I'll check the part numbers on the injectors, but I believe while I was at Maggie Valley with @SaltyClownNY, @Dave@DDMWorks looked @SaltyClownNY injectors and they were #60 if I remember correctly.

    Bill is an extremely intelligent person.

    What is the part number of the injectors? Are they just stock Slingshot injectors? If so, there are a ton of people like myself that would probably would sell them for cheap.
    Around $250 for 4 injectors is the price point for the bigger 60lb ones used in the boosted stock ECM tuned configuration.


    Why don't you just do yourself a favor and rip out the portfueler stuff and run the stock intake, 60lb injectors, and a Bob tune. We all know that is what is going to happen at some point anyways.

    I spoke to Bob and Dave at Maggie Valley and the thought was to use the Portfueler intake from Hahn and just swap the primary to secondary to cap off the injector holes and run the injectors supplied by Hahn in the stock position.


    Bill tells me they are 60# flow match injectors he provided to me. I've questioned him numerous times and he keeps telling me they are flow matched.


    Now maybe the you or the forum can educate me. Are all flow matched injectors sold with a data sheet showing their flow? If so I nor anybody I know got a data sheet from Hahn with that information.


    Thanks