Snox801

Ok i know it’s not gonna gain me much.
Stock car 20k on the clock. Mainly a fun car for the track and nice days.
Would you guys say a tune is helpful at the track?
Two spots at gratten where I hit limiter just before the corner. That’s where I think it may help the most. But they do make some gains and like many other just because they do t gain hp doesn’t mean that it’s not much better to drive.
Whats everyone’s take on it.
Thinking of buying versa tune using otc tune for my car raise limiter. Then this fall late or winter get on the dyno and see how much e85 I can run hopefully straight e 85. Because they just put a station less than a mole from my new house and they always have actual e85. All the subbie guys go to this because lowest tested was e80. Even in winter. So if I can run that I can hopefully do less carbon and less heat.
But knowing I will buy it anyway. Kinda curious as to whether I should get it now and try it.
Thanks

apex1

I am looking closely at the VT OTS tunes for street and track use as well. It seems like there are some small gains to be made by tuning the top end a bit leaner. However I am more interested in changing the fan temps and increasing OMP rates.

RPMs, not sure if that is safe, long term. I am sure others will add their experience.

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peloponisios

20k 8? Nice. So new.
Mostly Stock meaning oem exhaust system, intake etc etc? I wouldn't raise the rev limiter personally. For longevity reasons.
There's not a lot of info about vt though. Wouldn't the ecu adapt again to any changes made? The fan setting is nice but you would have to free the engine bay and then you must do another thing and ...you get the idea.
Enjoy your 8!

DocWalt

I'm happy with my VersaTune use for track.

I did spend the time to custom tune it myself though, fueling dialed into ~13:1 AFR and timing advance reduced a bit (with a smaller split). I've yet to get back to the dyno after fixing my ignition coil issues though.

I lowered my fan temps and increased OMP usage at higher loads. I still premix a decent amount when I'm using the car hard so no big deal either way.

E85 is going to be "fun" to tune without a dyno, but if you can get a dyno tuner to tune it, have fun. It's not really worth much on a Renesis like it is on other cars that benefit from the knock resistance.

Snox801

I’m thinking same line.
Lower fan temps. But back off my oil injection and use more premix. For all the usual benefits of two stroke oil.
I won’t do any tuning without going to a dyno.
The e85 I know won’t give any added anything but lower temps and less carbon. Uses more fuel I know but the way 93 oct prices have jumped it’s still gonna be much cheaper. But mainly cooling.

DocWalt

Remember you need E85 safe premix, but otherwise, yes, E85 is "good"

Snox801

Correct was gonna drop a line to amsoil to see if the saber is fine or not. Wonder were the blend ratio say e50 starts to play a part.

McTinkerson

Renewable Lubricants has a fully ethanol safe premix now.
https://renewablelube.com/products/b...-racing-premix

dallasreed

It is worth it if you are switching to e85. The power increase is with dialed in fuel and additional timing is 5-8%. For 93, stock tune vs a custom tune on a car with fairly open exhaust you are gaining so little it is near the margin for error. Performance wise you can increase or remove the rev limiter which has its uses otherwise. I say this from experience dyno tuning a few of these.

Snox801

Well mixed some 100:1 with e85 yesterday. It didn’t mix well but after shaking this is 24 hours later looks like it stays suspended to me.

Snox801

Thanks Dallas I’ve been stalking some of your posts. I think I may take the plunge for the tuner. More control of things I want like rev limit and oil. Then dyno tune for e85 or e50. Keep things cool and clean. Plus cheaper fuel than 93

TeamRX8

iTrader: (25)

they don't recommend that for E85, you should really consider the potential end result and cost more carefully before taking such an unnecessary and foolhardy risk compared to buying the correct E85 compatible premix instead

Snox801

Did you get confirmation from amsoil about that?
I was gonna drop the line to tech today to see.
Seems most others running e85 just make sure it mixes well. Could be double edge sword. Some that mix with e85 are not nearly as good at lubrication as others. So the same would be true mixing with e85 but it will mix. I’m more than likely gonna go with redline but it’s always good to know if other options are out floating about.
Plus I do t mind testing things on my car.
Hence why I also run engine Ice for coolant. I can say that I have had zero issues with heat in my car with switching. Stuff works well and even though it’s not Mazda recommended the manufacturer said it’s safe and Im over a year on it now.

TeamRX8

iTrader: (25)

I’m pretty sure they stated so in the past, or maybe I even asked them; honestly can’t recall. Because I used to use Saber Pro for gas and it’s great. So I get that, but it’s not worth chancing it imo. Even the standard Redline 2S oil is only rated to E50. They have a different alcohol version for E85. Which there are plenty of E85 compatible choices so why even try to go there? I would recommend adding a top lube to it in addition to premix if you go e-fuel. You can even get them in fruity fragrances to help mask the hydrocarbon smell.

So ask yourself this, it mixes together well under what circumstances; exposed to the atmosphere under a wide variety of temperature and other climate conditions? As an example, I remember a test of unleaded racing fuels quite a few years back and there were some of them that when exposed to sunlight and heat they had a black, gooey sludge develop and fall out. What was in there to cause that? Nobody knew, but who would be expecting that to happen …
.
.

Snox801

I fully understand your point and am probably going to find one that’s does work. I’m still keeping an eye on this jar as it still
looks mixed after a few days in the sun and fairly cool at night. Just because why not. Experiments are fun.