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Rebel Devil Performance announces the upcoming release of MK3 N/A Tuners from RDC

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#42 ·
Question

RebelDevilCustoms said:
I have a few questions and opinions

Image

Maybe I am missing something here , the only gains I see is from the extended run up of rpm higher then the stock tune , from 2000 to 6200 I dont see any gains , am I missing something ? and in some places lost minimal TQ

Image

Again the 3rd to 4th gear HP was a differance in final rpm otherwise 3rd to 4th would of been the same HP


Tom
Click to expand...
 
Discussion starter · #43 ·
I'll put the A/FR up later also, definitely cleaned that up, tune has a steadier pull on the street, and allowing the car to reach the top of the power band also helps. This was a basic 93 tune, we have more coming, tuning to match our mods plus a few other items.

Also this tune is a plug n play, no waiting (sent code, had 3 tunes within 3days) no data logging, but we will work on getting a tune to match our components for more power. Also have some more add-on power components for more.
 
Discussion starter · #44 ·
#45 ·
But it isnt " fluffing " the numbers , the gain/loss you stated is because you ren to a higher RPM during the dyno the actual comparison between 3rd and 4th from 2000 to 6300 was identical just like the tune vs no tune dyno

A dyno is for comparison so you have to keep apples with apples and oranges with oranges , if you do the base line dyno 2000 to 6300 you have to do all others 2000 to 6300 so you can tell what gains/loss you actually had

If you had done the 3rd to 4th dynoand the tune vs no tune dyno the same as the base line 2000-6300 rpm dyno then they would of been the same numbers with no gains / loss

In my opinion all dynos on the Focus should be done in 3rd gear , there is no sense in abusing an engine running 4th gear when 3rd gear as the dyno shows is going to be the same HP and TQ

Tom
 
#46 ·
In the words of many on here "No two dynos are the same"
 
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Discussion starter · #47 ·
The 3 vs 4th gear pulls were done both untuned. .. and true dyno gains are done with as close to 1:1 ratio as possible, I figured you would know that being the SCT God you seem to be. A 750 hp car can show up to 150 hp difference between 3rd and 4th.

Afaik we are one of the highest hp documented MK3 Focus... with only a CAI, CBE and Tune. But we are planning on getting the 93 octane tune to be more aggressive for more power
 
#48 ·
RebelDevilCustoms said:
The 3 vs 4th gear pulls were done both untuned. .. and true dyno gains are done with as close to 1:1 ratio as possible, I figured you would know that being the SCT God you seem to be. A 750 hp car can show up to 150 hp difference between 3rd and 4th.
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Is there really any sense in talking and being this way , I was simply trying to make you and others aware why you think you made 7hp off your tune , it wasnt from the tune it was from the extended RPM o the tuned run

Same with the 3rd to 4th dyno run , the difference in HP was from extending the rpm on one run and not the other

Again a dyno is for comparison runs to see if "X" helped or didnt help , dynos can be done in any gear , you DO NOT have to do them as close to a 1:1 ratio but you do have to do the runs the same and if you look at the dynos and at the HP and TQ on the tuned vs not tuned and the 3rd vs 4th at stop them at 6300 you will see there was NO gain from the tune and no loss or gain from the 3rd to 4th gear dyno

Depending on the car yes a 750HP car from 3rd to 4th may show a difference , a MK3 Focus at 170hp will not as you can see

Tom
 
Discussion starter · #49 ·
As I said we are also working on getting a more aggressive tune for the 93octane... but even lifting the Rev limiter will allow us to stay going up in the power band, the tune did clean up a lot of crap in the stock tune, the A/F ratio proved that... put it right in the sweet spot. we will also test the MPG increase. We can agree to disagree, I feel a custom tune for each car individually isn't warranted for an NA Focus with minor bolt-ons. Just have to see where we go with this. ... good luck on your side
 
#50 ·
It's cool that you guys shared your findings with us. I assumed maybe more would come from the tune tbh but im only looking at the graph. Definitely interested to see how your refinement process pans out. Still in for pictures because RACECAR and I'm sure it's red lol. You're inching ever close to the magic number. Since you don't plan on creating your own header will you ever test one such as the obx or similar? Also, since you can tune and have dyno time..think you would ever look into a ported throttle body?
 
#54 ·
I knew your base run with the lunchbox delete was from a while ago, assumed it was with the 16's but I didn't know.

9 hp. increase with the CAI was done with the CAT back installed, leaving a 5 hp. increase for the CAT back. I'd actually think some of that for the CAI is synergistic, CAT back plus CAI will be better than either individually.

Didn't see a post showing how you got the CAI numbers, looks like that was pre-tune from the final being tuned/untuned.

Current results do look like the main difference in hp. from tuning is from the raised limiter, you did mention it felt a bit better & the A/F readings not posted yet looked smoother. Still no appreciable change in hp. under the original rpm limit.


I've got to comment that the difference from wheel weight doesn't translate to the street except during acceleration (hard to guess how much then, rate of accel. on the dyno is likely different). Steady state the wheel weight has no effect, no noticeable difference in drag keeping the heavier wheels spinning. Lighter wheels can have advantages, but some of the assumed ones don't really exist.
 
#56 ·
The Car & Driver test shows some good results from the extremes, note that as they mention more than wheel weight is involved in their test results.

For the Dyno, if a run was done in stages instead of as an acceleration run, wheel/tire weight wouldn't have any effect on the results. That's not the normal way to get measurements from a typical rolling road test, resistance to acceleration is part of the measurement. This holds for other drivetrain weight reduction, it's not limited to wheels. Lightened engine parts can help acceleration (again, not as much as usually assumed) but it has no effect on steady state HP when it's from rotational parts.
 
#57 ·
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#59 ·
RebelDevilCustoms said:
With tires ST wheels are 50lbs each according to my source.. so need to weigh my SE wheels also... another hit I forgot about was my front rotors. ...from OE 10.9 increased to Stoptech 12.6
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Yeah ST and Ti wheels are really heavy. The brake weight probably is less important because the motor isn't trying to spin them, that weight could be made up by having a small person drive the dyno.
 
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#60 ·
darkangelism said:
Yeah ST and Ti wheels are really heavy. The brake weight probably is less important because the motor isn't trying to spin them, that weight could be made up by having a small person drive the dyno.
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Uhhh....the rotors are spun by the motor as well as the wheels
I don't even know what you are talking about with the small person...
 
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