Xede, GT2560, 12psi
#1
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Xede, GT2560, 12psi
Took the car to Gas Head Motorworks in Houston this morning and they spent about 2 hrs working on my bitch to idle decently and about an hr on the dyno.
For the last 2 weeks it would have a very lumpy idle with the AC on and stall when the RPM dropped much below 1K. Tip in was jerky and it was difficult to cruise at low 1st and 2nd gear speeds below 2K rpm. WOT felt great, though. Also a CEL was always lit for misfire.
They moved the 02 sensor further down since they suspected it was getting too hot and screwing with my air/fuel. It helped the idle immensley and Clint was able to smooth out the idle after that.
Going from his shop to another shop (where the dyno was) he drove and had me adjust settings at various RPM and load. This helped driveability immensly.
Only gained a few peak HP and torque but everything under the curve was smoother and better.
I don't have a scanner but it was on a dynojet:
227 hp @ ~ 6600 RPM
218 ft-lbs @ ~ 3800 RPM
air/fuel stayed between 13 and 14 but dipped close to 12 at 3600 RPM
temps were in the low 90's this afternoon
Great shop, Clint and Kevin are awesome and know their Miatas.
For the last 2 weeks it would have a very lumpy idle with the AC on and stall when the RPM dropped much below 1K. Tip in was jerky and it was difficult to cruise at low 1st and 2nd gear speeds below 2K rpm. WOT felt great, though. Also a CEL was always lit for misfire.
They moved the 02 sensor further down since they suspected it was getting too hot and screwing with my air/fuel. It helped the idle immensley and Clint was able to smooth out the idle after that.
Going from his shop to another shop (where the dyno was) he drove and had me adjust settings at various RPM and load. This helped driveability immensly.
Only gained a few peak HP and torque but everything under the curve was smoother and better.
I don't have a scanner but it was on a dynojet:
227 hp @ ~ 6600 RPM
218 ft-lbs @ ~ 3800 RPM
air/fuel stayed between 13 and 14 but dipped close to 12 at 3600 RPM
temps were in the low 90's this afternoon
Great shop, Clint and Kevin are awesome and know their Miatas.
#11
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It starts to really spool at ~3300 RPM and full boost at 3700 RPM. AFR's stay 13.5 to 14 from 4K to redline.
Definately going to address this tomorrow, thanks for looking out guys.
Definately going to address this tomorrow, thanks for looking out guys.
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To be fair, if you had an EGT gauge that was reading correct engine temps, and the guys did tests at both 12.0:1 and 13.0:1 and 14.0:1, and the 13-14 range made more power with acceptable EGTs, then I would be OK with it.
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
#17
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To be fair, if you had an EGT gauge that was reading correct engine temps, and the guys did tests at both 12.0:1 and 13.0:1 and 14.0:1, and the 13-14 range made more power with acceptable EGTs, then I would be OK with it.
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
#18
Sorry, any dyno operator who lets a pull continue when things get above mid 13's is nobody I'd take my car to.
The last dyno-day here in Hampton Roads, we had a Voodoo'd '97 where the operator aborted at around 4000rpm when there was a steady rise above 13:1 and was clearly on it's way to dangerous. He said, needs more fuel and we'll try again. Next run, aborted at about 4500rpm where we ran out of fuel... etc.. etc... We maxed out pots over several runs until it would stay rich enough.
I was impressed beyond words... we all know what happens to a shops' reputation when they start blowing up motors.
The last dyno-day here in Hampton Roads, we had a Voodoo'd '97 where the operator aborted at around 4000rpm when there was a steady rise above 13:1 and was clearly on it's way to dangerous. He said, needs more fuel and we'll try again. Next run, aborted at about 4500rpm where we ran out of fuel... etc.. etc... We maxed out pots over several runs until it would stay rich enough.
I was impressed beyond words... we all know what happens to a shops' reputation when they start blowing up motors.
#19
To be fair, if you had an EGT gauge that was reading correct engine temps, and the guys did tests at both 12.0:1 and 13.0:1 and 14.0:1, and the 13-14 range made more power with acceptable EGTs, then I would be OK with it.
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
Somehow I doubt you have an EGT gauge, and somehow I doubt those tests were done. Does that shop have experience with turbo tuning, or are they mostly an NA shop?
#20
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Ok I just got off the phone with Clint. He wasn't basing his AFR off the dyno's WB but the one at the downpipe, pre-cat. The unit looked like an Innovate LM-1.
He said he kept AFR's in the low 12's.
He said he kept AFR's in the low 12's.