thunderslide help: good perf, poor mpg
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Cruiser
Joined: Sep 2007
Posts: 175
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From: Katy, TX
thunderslide help: good perf, poor mpg
I had an Indy dyno tune my stock 98 Evo with high flow a/c and KhomeWerks mufflers. The carb already had the Thunderslide, and so I assumed it has a DynoJet kit installed as well. Mechanic said it was not, and wasn't familiar with the emulsion tube it had, and that his jets would fit it, so he ordered a DynoJet kit. Because I didn't want MPG to suffer, I had requested that he stick with a 42 and 160 main, but this was when I dropped it off, not after he started the tune.
So after the tune, it runs great, but my MPG is worse. I used to get in the low 40's, which I was not pleased with, now i'm at 37 at very best with easy riding conditions. He said it's really set up on the lean side, per my instructions, but my mpg stinks.
So my question is, does the Thunderslide itself cause poor mpg's? Why? Should I remove it and find a stock slide and other parts? ... OR, How do I make the DynoJet kit with Thunderslide work properly without killing my mpgs? I may have to do it myself because the Indy says 35mpg is "normal" when you dyno tune it for performance. I don't know if he'll "fix" it without wanting more money. $250.00 for the tune plus $90.00 for the kit, makes me a non-happy customer.
I'm a conservative rider and prefer to get long range from my gas tank. I want a smooth ride, not necessarily a fast one.
So after the tune, it runs great, but my MPG is worse. I used to get in the low 40's, which I was not pleased with, now i'm at 37 at very best with easy riding conditions. He said it's really set up on the lean side, per my instructions, but my mpg stinks.
So my question is, does the Thunderslide itself cause poor mpg's? Why? Should I remove it and find a stock slide and other parts? ... OR, How do I make the DynoJet kit with Thunderslide work properly without killing my mpgs? I may have to do it myself because the Indy says 35mpg is "normal" when you dyno tune it for performance. I don't know if he'll "fix" it without wanting more money. $250.00 for the tune plus $90.00 for the kit, makes me a non-happy customer.
I'm a conservative rider and prefer to get long range from my gas tank. I want a smooth ride, not necessarily a fast one.
Last edited by texasridr; May 1, 2011 at 12:38 PM.
Stage IV
Joined: Jan 2012
Posts: 4
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From: Phoenix
you will get responses all over the map with this as I have. I listened to a lot of them and nothing worked. so many people told me the dynojet thunderslide kit was garbage and killed gas mileage, but my stock configuation was not much better if at all. and the thunderslide did give a lot better throttle response with that lighter spring and lighter slide. if you find an answer let me know. xanadu at wydebeam dot com.
Club Member
Joined: Jun 2007
Posts: 45,429
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From: Bedford UK
It sounds as if your dyno guy replaced the Thunderjet with the Dynajet. You can have one or the other, not both! They are designed to undo the lean burn setup of a stock carb, give better air/fuel ratios, better performance and, if you use it well, greater fuel consumption. In essence that will happen with any similar changes.
If you go back to a stock setup with jetting, you will lose performance, but probably gain improved fuel consumption.
If you go back to a stock setup with jetting, you will lose performance, but probably gain improved fuel consumption.
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