Roush Phase 2 low speed drivability issue

[Joey316g]

Installed a Roush Phase 2 on my 17 PP car. Currently running the Roush tune as a baseline. Had the car dyno'd. Made 600 RWHP on the dot. Car feels great under full throttle. Pulls hard and revs smooth. Idles perfect and runs great as long as I'm accelerating. Car is completely stock other than the Phase 2. I'm having a couple low speed steady state RPM drivability issues.

While driving at speeds typically between 30-50 mph holding the RPMs between 2000 and 3000, the car seems to miss slightly and surge a bit. I'm wondering if anyone else has experienced this with this setup. If so, did a tune from another tuner make it go away or fix the issue? I've also been thinking about the spark plugs they give you being 2 heat ranges colder causing some issues while not under boost.

Side question also: is anyone running long tubes with the stock Roush tune and if so did it run better with them or worse? Reason being is when I look at A/F under full load, the Roush tune is way rich. I'm sure they did this for safety but I'm wondering if the headers made the car run smoother with this tune.

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[hossman]

I’m running the Roush Phase 2 setup on my 17 and no drivability issues whatsoever. I agree the Roush tune is a bit rich and causes quite a few pops in the exhaust but otherwise very happy. I hope you get it figured out.

 

[JakeS550]

Installed a Roush Phase 2 on my 17 PP car. Currently running the Roush tune as a baseline. Had the car dyno'd. Made 600 RWHP on the dot. Car feels great under full throttle. Pulls hard and revs smooth. Idles perfect and runs great as long as I'm accelerating. Car is completely stock other than the Phase 2. I'm having a couple low speed steady state RPM drivability issues.

While driving at speeds typically between 30-50 mph holding the RPMs between 2000 and 3000, the car seems to miss slightly and surge a bit. I'm wondering if anyone else has experienced this with this setup. If so, did a tune from another tuner make it go away or fix the issue? I've also been thinking about the spark plugs they give you being 2 heat ranges colder causing some issues while not under boost.

Side question also: is anyone running long tubes with the stock Roush tune and if so did it run better with them or worse? Reason being is when I look at A/F under full load, the Roush tune is way rich. I'm sure they did this for safety but I'm wondering if the headers made the car run smoother with this tune.

I have noticed the same thing every once in a while. I will be driving at 40 mph in 4th gear(3.31 manual) around 2000 rpm and there is a very slight surge while I’m driving. I really have to try and feel for it, but it’s there. Everything else is great. I will be going with a Lund tune next spring. My car was tuned by them before I put on the blower and it ran great. A couple guys in my mustang club had there’s tuned and said it was night and day difference all around. Hope this helps. Keep me posted if you get it figured out.

 

[NIL8GM]

I have noticed the same thing every once in a while. I will be driving at 40 mph in 4th gear(3.31 manual) around 2000 rpm and there is a very slight surge while I’m driving. I really have to try and feel for it, but it’s there. Everything else is great. I will be going with a Lund tune next spring. My car was tuned by them before I put on the blower and it ran great. A couple guys in my mustang club had there’s tuned and said it was night and day difference all around. Hope this helps. Keep me posted if you get it figured out.

I have the same issue. Surges every so often under steady cruise. Other than that seem to run "ok". Have a VMP tune on order should be in next week. Hoping it cleans up the part throttle a bit. I like the fact VMP now use the nGauge and HP tuners so there is no need to swap out the Roush IAT and add the harness. Car can be put back to the Roush tune at anytime if needed.

 

[Joey316g]

I have noticed the same thing every once in a while. I will be driving at 40 mph in 4th gear(3.31 manual) around 2000 rpm and there is a very slight surge while I’m driving. I really have to try and feel for it, but it’s there. Everything else is great. I will be going with a Lund tune next spring. My car was tuned by them before I put on the blower and it ran great. A couple guys in my mustang club had there’s tuned and said it was night and day difference all around. Hope this helps. Keep me posted if you get it figured out.

Thanks so much for the reply. I'm glad it isn't just me. I had This sc on a 15 with the Phase 1 tune and trim and it didn't do this. Car was totalled. So when I reinstalled It on my new 17 I upgraded To Phase 2 and this was happening. Thought might have something messed up.

 

[Joey316g]

I have the same issue. Surges every so often under steady cruise. Other than that seem to run "ok". Have a VMP tune on order should be in next week. Hoping it cleans up the part throttle a bit. I like the fact VMP now use the nGauge and HP tuners so there is no need to swap out the Roush IAT and add the harness. Car can be put back to the Roush tune at anytime if needed.

That's good info. I didnt Know that. Keep me posted on how it works out. Maybe I'll go that way as I'd rather not change out the harness an IAT ... thanks a lot

 

[sy1462]

I didn’t have any surging that I recall.... but it was way rich. VMP tuned now with the SCT, drives perfect.

 

[Joey316g]

I didn’t have any surging that I recall.... but it was way rich. VMP tuned now with the SCT, drives perfect.

Thanks for the input. May go VMP when the time comes.

 

[scotty]

Installed a Roush Phase 2 on my 17 PP car. Currently running the Roush tune as a baseline. Had the car dyno'd. Made 600 RWHP on the dot. Car feels great under full throttle. Pulls hard and revs smooth. Idles perfect and runs great as long as I'm accelerating. Car is completely stock other than the Phase 2. I'm having a couple low speed steady state RPM drivability issues.

While driving at speeds typically between 30-50 mph holding the RPMs between 2000 and 3000, the car seems to miss slightly and surge a bit. I'm wondering if anyone else has experienced this with this setup. If so, did a tune from another tuner make it go away or fix the issue? I've also been thinking about the spark plugs they give you being 2 heat ranges colder causing some issues while not under boost.

Side question also: is anyone running long tubes with the stock Roush tune and if so did it run better with them or worse? Reason being is when I look at A/F under full load, the Roush tune is way rich. I'm sure they did this for safety but I'm wondering if the headers made the car run smoother with this tune.

I have the Roush phase one kit and also experienced this for a while ... I had the kit installed in back in February, so I was still running my winter tires at the time... but same story as you. WOT is great, idle is great, just the little annoyance in that RPM range around town. It was annoying me so much that I actually went back to the dealer and told them what was going on - They got Roush on the horn and were told the tune is the same for everyone and works fine for their other customers and didn't seem all that interested in looking into the problem.... didn't even want to look at a datalog.

Anyway, fast forward to April and I put my summer tires back on (stock size 255 40 R19). Went for a drive and started noticing the car was starting to behave a little bit better... The more I drove it the better it got... surging was not nearly as bad and the little 'miss' seemed to be gone for the most part. I didn't change a thing on the car besides the tires. I don't know if it was placebo, the warmer weather, tire size or just a fluke .... but I feel it drives fine now. The tune is still ridiculously conservative and pig rich... Also has a bunch of torque management nannies enabled that like to step in at the worst possible times ... I really think the way to go with these Roush setup's is to go with an aftermarket tune.... I've been emailing back and forth with Lund about tuning for the past little while ... probably going to bite the bullet and do it over the winter.

 

[NIL8GM]

I put my summer tires back on (stock size 255 40 R19).

I could not imagine traction with those tires?! I have 315/35 mpss on my Roush stage one and I can light the tires up at will in second gear and quite often in 3rd! 3.73 gears though.......

 

[scotty]

I could not imagine traction with those tires?! I have 315/35 mpss on my Roush stage one and I can light the tires up at will in second gear and quite often in 3rd! 3.73 gears though.......

Haha, I have 3.31's so that helps a bit. With the stock Pirelli's that came with the car .. yeah, very very bad traction issues... Would light up on command in 1st and 2nd, it was like driving on plastic tires. I ended up replacing the Pirelli's with Firestone Firehawk Indy 500's a few months back... (decided to stick with the factory wheels for now because of how much I already spent on the car this year). While they aren't drag radials by any means, they still seem to put the power down very well... 1st is still a bit of a crapshoot unless you launch softly, but 2nd and up is solid. Doesn't break loose at all. I'm sure that will change when the weather starts cooling down though..

 

[WhiteyDog]

I have the Phase 1 with 82mm pulley, fuel pump booster, headers, 3" exhaust, and tuned by Lund. I never had the Roush tune because I already had the headers on the car before the supercharger went on and was told the Roush tune is set up for the stock headers. (How true that is I don't really know). But being tuned with Lund I can say this thing drives exceptionally well. No issues at any rpm range, idling, tip in, mid-range, wot, the whole thing is perfect all around. Lund did have me get the fuel pump booster and a Reische 170degree thermostat. Running 315/35/20's in the rear.

 

[JakeS550]

I have the Phase 1 with 82mm pulley, fuel pump booster, headers, 3" exhaust, and tuned by Lund. I never had the Roush tune because I already had the headers on the car before the supercharger went on and was told the Roush tune is set up for the stock headers. (How true that is I don't really know). But being tuned with Lund I can say this thing drives exceptionally well. No issues at any rpm range, idling, tip in, mid-range, wot, the whole thing is perfect all around. Lund did have me get the fuel pump booster and a Reische 170degree thermostat. Running 315/35/20's in the rear.

Sounds awesome! I have the Reische thermostat in mine. Just need injectors. Did you have to replace the clutch yet?

 

[WhiteyDog]

No, still the stock clutch. But, I'm not out doing hard launches and going to the 1/4 mile strip though either.

 

[beetle6986]

I just got a Phase 2 car recently. My has the surging a little bit while cruising in the 2,000 to 2,500 RPM range. I had another car that did that and they turned of the EGR system to resolve it. Did the custom tune resolve it for any of you. I'm planing to get a VMP tune soon.

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