Speed Density tuning an EVO8 w/dyno sheets
Oct 12, 2009, 01:30 PM
#1
Speed Density tuning an EVO8 w/dyno sheets
We had a customer, EVO8LTW, bring his EVO8 in for some work. The car was dropped off for a number of things, drop in pistons/rods, cams etc.
The car is equipped with our drop in pistons/rods, BF272 cams, Race FMIC, upper/lower i/c pipe, HKS DLI2 ignition, 3" turbo back, FP Red and more. That is the basics of the build.
The unusual part of the build was the stock ECU being converted to speed density. Rich, the owner, had the car pretty dialed in when it was dropped off and gave me a few pages of notes
It made my job pretty darn easy. I wasn't sure what to expect and had been hesitant to even want to get started on it. Truth is, the tune went smoothly and was one of the easier cars I've had to tune.
The car is running straight 93 octane fuel from Shell and was tuned at 31.6 psi of boost with the stock knock tables set up. The power it made is up there with the highest numbers we've seen on a Red on our dyno on just pump gas.
Here is the graph in 3rd gear:
This one is 4th gear and you can see there was some compressor surge down low which put the flat spot in the tq/whp, still excellent power:
[/QUOTE]
At this power level this car can easily run in the 10's just the way it sits with close to 130 MPH trap speeds.
The car is set up for road racing and should be a killer combination for that. Very nicely put together car, nice cage in it although it was a bit cramped for me.
Enjoy your car Rich, it's going to impress you I think
The car is equipped with our drop in pistons/rods, BF272 cams, Race FMIC, upper/lower i/c pipe, HKS DLI2 ignition, 3" turbo back, FP Red and more. That is the basics of the build.
The unusual part of the build was the stock ECU being converted to speed density. Rich, the owner, had the car pretty dialed in when it was dropped off and gave me a few pages of notes
It made my job pretty darn easy. I wasn't sure what to expect and had been hesitant to even want to get started on it. Truth is, the tune went smoothly and was one of the easier cars I've had to tune. The car is running straight 93 octane fuel from Shell and was tuned at 31.6 psi of boost with the stock knock tables set up. The power it made is up there with the highest numbers we've seen on a Red on our dyno on just pump gas.
Here is the graph in 3rd gear:
This one is 4th gear and you can see there was some compressor surge down low which put the flat spot in the tq/whp, still excellent power:
[/QUOTE]At this power level this car can easily run in the 10's just the way it sits with close to 130 MPH trap speeds.
The car is set up for road racing and should be a killer combination for that. Very nicely put together car, nice cage in it although it was a bit cramped for me.
Enjoy your car Rich, it's going to impress you I think
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Oct 12, 2009, 02:17 PM
#10
Wow!
Wow!!! I had high hopes, but I didn’t think it would make that sort of power on the stock ECU and 93 octane! Holy cow!
Thanks so much to everyone at Buschur, from Nick Ryan who made the whole ordering and scheduling process painless, to Daniel for wrenching on the car, to David for tuning the car, answering my questions and generally being patient with a really picky, difficult customer. David has been extremely responsive to emails and PMs, he read my “memos,” and he took on a new challenge with the SD tune. I was happy with BR before I even got the dyno results!
I’d also like to thank the amazing folks on the EcuFlash forum who generously share their developments and knowledge of the stock ECU daily with others for little to no compensation. In particular, tephra, mrfred, jcsbanks, and l2r99gst’s posts, threads, and developments have helped me out tremendously with tricking out the stock ECU and converting to SD. A few years ago, I bought an AEM EMS but I sold it before installing it when I started to appreciate what the stock ECU could do. No regrets!
Thanks again to all! Can’t wait to get the car back!
Thanks so much to everyone at Buschur, from Nick Ryan who made the whole ordering and scheduling process painless, to Daniel for wrenching on the car, to David for tuning the car, answering my questions and generally being patient with a really picky, difficult customer. David has been extremely responsive to emails and PMs, he read my “memos,” and he took on a new challenge with the SD tune. I was happy with BR before I even got the dyno results!
I’d also like to thank the amazing folks on the EcuFlash forum who generously share their developments and knowledge of the stock ECU daily with others for little to no compensation. In particular, tephra, mrfred, jcsbanks, and l2r99gst’s posts, threads, and developments have helped me out tremendously with tricking out the stock ECU and converting to SD. A few years ago, I bought an AEM EMS but I sold it before installing it when I started to appreciate what the stock ECU could do. No regrets!
Thanks again to all! Can’t wait to get the car back!
Oct 12, 2009, 02:25 PM
#11
Let me try to answer some of the questions. I'm running an AEM 3.5 bar MAP sensor and a GM AIT sensor. You can use a number of different MAP sensors, but you really don't want to peg your MAP sensor on SD because my understanding is that the ECU will not extrapolate out fueling past the max load in the MAP VE table (i.e., you overboost, you lean out badly).
As far as pre- and post-SD numbers, I did not attempt to come up with any. Using DLL, it made 440-460 whp on pump (Dynojet simulation) before this build at 25 psi. That was with smaller cams, stock motor, etc. There's a thread in this forum that I did on that. After I added the SD, I didn't do any WOT fine tuning because I knew that the car was Buschur-bound anyhow and the set-up would change.
I don't know what a set-up like this would typically make on Buschur's dyno with the MAF.
FWIW, my Red has the stock IX compressor cover, not the new 80mm one. Given the surge issues that David saw in 4th, I'll probably swap the cover this winter.
As far as pre- and post-SD numbers, I did not attempt to come up with any. Using DLL, it made 440-460 whp on pump (Dynojet simulation) before this build at 25 psi. That was with smaller cams, stock motor, etc. There's a thread in this forum that I did on that. After I added the SD, I didn't do any WOT fine tuning because I knew that the car was Buschur-bound anyhow and the set-up would change.
I don't know what a set-up like this would typically make on Buschur's dyno with the MAF.
FWIW, my Red has the stock IX compressor cover, not the new 80mm one. Given the surge issues that David saw in 4th, I'll probably swap the cover this winter.
Oct 12, 2009, 02:31 PM
#12
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Wow!!! I had high hopes, but I didn’t think it would make that sort of power on the stock ECU and 93 octane! Holy cow!
Thanks so much to everyone at Buschur, from Nick Ryan who made the whole ordering and scheduling process painless, to Daniel for wrenching on the car, to David for tuning the car, answering my questions and generally being patient with a really picky, difficult customer. David has been extremely responsive to emails and PMs, he read my “memos,” and he took on a new challenge with the SD tune. I was happy with BR before I even got the dyno results!
I’d also like to thank the amazing folks on the EcuFlash forum who generously share their developments and knowledge of the stock ECU daily with others for little to no compensation. In particular, tephra, mrfred, jcsbanks, and l2r99gst’s posts, threads, and developments have helped me out tremendously with tricking out the stock ECU and converting to SD. A few years ago, I bought an AEM EMS but I sold it before installing it when I started to appreciate what the stock ECU could do. No regrets!
Thanks again to all! Can’t wait to get the car back!
Thanks so much to everyone at Buschur, from Nick Ryan who made the whole ordering and scheduling process painless, to Daniel for wrenching on the car, to David for tuning the car, answering my questions and generally being patient with a really picky, difficult customer. David has been extremely responsive to emails and PMs, he read my “memos,” and he took on a new challenge with the SD tune. I was happy with BR before I even got the dyno results!
I’d also like to thank the amazing folks on the EcuFlash forum who generously share their developments and knowledge of the stock ECU daily with others for little to no compensation. In particular, tephra, mrfred, jcsbanks, and l2r99gst’s posts, threads, and developments have helped me out tremendously with tricking out the stock ECU and converting to SD. A few years ago, I bought an AEM EMS but I sold it before installing it when I started to appreciate what the stock ECU could do. No regrets!
Thanks again to all! Can’t wait to get the car back!
DB or OP what is the max mileage for drop in pistons? Oh and BTW great job
Oct 12, 2009, 02:38 PM
#13
I haven't driven the car in its new form yet, but with SD on the old set-up it drove great. I know what you are talking about with the low RPM studder (the thing that l2r99gst first posted about). I can induce that by holding the car at around 2000 rpm, but I don't drive like that usually. The feeling is a slight jerkiness in that narrow RPM range at very low loads, but I would have never noticed it if it hadn't been pointed out to me. Definitely not a reason to avoid SD unless you really like cruising at 2000 rpm.
Oct 12, 2009, 02:45 PM
#14
Thanks for answering many of the questions Rich.
The best ever Red on stock ECU on our dyno was 510 at this boost level, that was Project White on E85 with the stock MAF and about 31-32 psi if I remember correctly.
On an AEM EMS a typical build will make about this much power, maybe even a little less on pump gas, so this is excellent power and I need to mention again, I did NOT modify the stock knock tables at all.
The car does have a jerky feeling down low, in the 2500 rpm range, I forgot to mention that to you Rich so I'm glad it was there before. I'll be dead honest, it's the same feeling and same RPM range MANY AEM equipped cars have too, very odd.
I'd say typically a drop in piston build can't be done over 40,000 miles or so. This car was in exceptional condition, probably some of the best cylinder wear I have seen.
The best ever Red on stock ECU on our dyno was 510 at this boost level, that was Project White on E85 with the stock MAF and about 31-32 psi if I remember correctly.
On an AEM EMS a typical build will make about this much power, maybe even a little less on pump gas, so this is excellent power and I need to mention again, I did NOT modify the stock knock tables at all.
The car does have a jerky feeling down low, in the 2500 rpm range, I forgot to mention that to you Rich so I'm glad it was there before. I'll be dead honest, it's the same feeling and same RPM range MANY AEM equipped cars have too, very odd.
I'd say typically a drop in piston build can't be done over 40,000 miles or so. This car was in exceptional condition, probably some of the best cylinder wear I have seen.
