Mountune 93 Tune - Remarkably Impressive (Data Inside w/Comparisons to Other Tunes)

[atlantaM3]

So, some feedback after bombing around my favorite roads in Western NC for the day. Prior tune was Cobb stg1 - car is totally stock otherwise, 50k miles, very good tires. For some context on feedback, driver experience is lots of track days both car and liter bike, multiple tracks in SE. Other cars are much wilder than the Fiesta, such as tuned RS and M3.

Day - 460 miles, altitudes ranging from 1200 to 6100 feet, so lots of climbing/descending involved overall, lots of tight curvy areas.

Good -
lots more midrange
easily controlled once on throttle past 3k
pretty linear pull past 3k rpm to redline, albeit dips a bit after 5500.
dont need full throttle to get strong power out of corner
still has very good mileage - overall average of 30 MPG for the day, Hwy still sits at about 37 MPG. Wow!
Makes me wonder if car needs any more power for mtn road use.

Not so good -
initial throttle tip in is very aggressive in comparison
very steep ramp in power from 2500 to 3k, need to be careful there if in really tight turn, initial surge in power is a bit hairy if it hits around mid-corner
a big grab of throttle results in a big amount of tire spin with loss of line - gentle application required compared to others
big heat control issues in some scenarios- will expand below
as expected, still runs out of go at 5500, but not really a tune problem - it is still better then stock on this though

Heat issue - ambient temps of 70' during my mtn day, so on flat ground it was fine. Also fine going down the mtn. Did 'ok' going up the mtn on the side that was super tight, so very shorts bursts of throttle through the corners. On the side of the mtn that had lots of sweeping turns - here I had to be very careful, could not go past 1/2 throttle going up the mtn as temps rapidly rose to concerning levels. Coolant temp of 225+, oil temp readings of near 240' - these while actively managing throttle use and limiting speed. Ended up running heater to help control.So, not great, will require cooling changes to keep under control.

Fun highlight of the day - guy driving a recent-ish model 911 Carrera had to give me a point by on the fun tight curvy areas, then dropped him like a bad habit. My have really hurt his ego, as when we got down the mtn, he kept wanting to drag race from a light. Really?? Its not the cars fault...


Overall, was stunned at the pace I could comfortably maintain while still leaving lots of room for mid corner corrections, etc. I still cant believe how good this thing is for being a parts bin car.

 

[rotation_nation]

OK so I just loaded up the tunewerks E30 tune. Randy has been very easy to work with and responsive. In the e-mail, he stated that the target boost of his OTS E30 tune is 21.5 PSI. Given that the Dizzy E30 tune hits 26.5 for me, I was convinced this would be a more conservative tune and lack the punch of Dizzy's.

When I first got on it, the tune felt smooth. It didn't have the initial wheel spin shove of the Dizzy tune, but it felt like a more linear power delivery. Upon returning home, I fed ChatGPT my logs and was stunned to see that the tunes are almost identical in terms of straight line speed delivery. I don't know how at 21.5 PSI the Randy Robles tune can keep up. It doesn't feel as punchy, but somehow is. The timing is more aggressive, but I didn't get a single negative correction (nor did I with the dizzy tune).

He must be doing some magic with other tuning 'levers'. I'd imagine the turbo is also staying a lot cooler spinning to only 21.5, so perhaps the charge density is higher? Who knows!

 

[rotation_nation]

So, some feedback after bombing around my favorite roads in Western NC for the day. Prior tune was Cobb stg1 - car is totally stock otherwise, 50k miles, very good tires. For some context on feedback, driver experience is lots of track days both car and liter bike, multiple tracks in SE. Other cars are much wilder than the Fiesta, such as tuned RS and M3.

Day - 460 miles, altitudes ranging from 1200 to 6100 feet, so lots of climbing/descending involved overall, lots of tight curvy areas.

Good -
lots more midrange
easily controlled once on throttle past 3k
pretty linear pull past 3k rpm to redline, albeit dips a bit after 5500.
dont need full throttle to get strong power out of corner
still has very good mileage - overall average of 30 MPG for the day, Hwy still sits at about 37 MPG. Wow!
Makes me wonder if car needs any more power for mtn road use.

Not so good -
initial throttle tip in is very aggressive in comparison
very steep ramp in power from 2500 to 3k, need to be careful there if in really tight turn, initial surge in power is a bit hairy if it hits around mid-corner
a big grab of throttle results in a big amount of tire spin with loss of line - gentle application required compared to others
big heat control issues in some scenarios- will expand below
as expected, still runs out of go at 5500, but not really a tune problem - it is still better then stock on this though

Heat issue - ambient temps of 70' during my mtn day, so on flat ground it was fine. Also fine going down the mtn. Did 'ok' going up the mtn on the side that was super tight, so very shorts bursts of throttle through the corners. On the side of the mtn that had lots of sweeping turns - here I had to be very careful, could not go past 1/2 throttle going up the mtn as temps rapidly rose to concerning levels. Coolant temp of 225+, oil temp readings of near 240' - these while actively managing throttle use and limiting speed. Ended up running heater to help control.So, not great, will require cooling changes to keep under control.

Fun highlight of the day - guy driving a recent-ish model 911 Carrera had to give me a point by on the fun tight curvy areas, then dropped him like a bad habit. My have really hurt his ego, as when we got down the mtn, he kept wanting to drag race from a light. Really?? Its not the cars fault...


Overall, was stunned at the pace I could comfortably maintain while still leaving lots of room for mid corner corrections, etc. I still cant believe how good this thing is for being a parts bin car.

Very good review! The whoosh v3 intercooler is the best thing i have done to my car. In my view, it is an absolute requirement for any tune beyond stock. These turbos generate so much heat when running higher boost. With whoosh, you will see charge temps of 5* above ambient. I would imagine that you were getting charge temps of 110* or more, which robs tons of power and leads to other issues.

It's a very easy install - no modifications required. It will completely transform your car and driving enjoyment.

 

[atlantaM3]

Actually, IAT's were pretty controlled, since I couldn't stay on it for any length of time. Even coming up the mtn where I experience the heat mgmt issues, IAT's were at worst 10-12' above ambient.

I already have a pile of parts, including the S280 and Mountune radiator, just havent made time to install. Thought it an interesting data point about how much cooling load this tune added compared to the prior.

 

[rotation_nation]

Actually, IAT's were pretty controlled, since I couldn't stay on it for any length of time. Even coming up the mtn where I experience the heat mgmt issues, IAT's were at worst 10-12' above ambient.

I already have a pile of parts, including the S280 and Mountune radiator, just havent made time to install. Thought it an interesting data point about how much cooling load this tune added compared to the prior.

Are you looking at intake air temps or charge temps? Charge temps are what matter (the air that’s been compressed and heated by the turbo).