I want to share with you something.
Posted: Sun Nov 08, 2009 4:27 am
Today I took my rally car out on the road for one more drive before it gets too cold here in Nashville. It was a beautiful 70F today.
First, this is the car:
http://www.youtube.com/watch?v=MWw5Y5Ndo4Y
This is a quick 1-2 pull I did on my street, I didn't take it any further cause this is still a neighborhood:
http://www.youtube.com/watch?v=DAXtfjN9nUo
Boost then was 15PSI peak with a 10PSI settle, I still hadn't worked out the kinks in the MBC.
So that's the short of the history, here's some specs:
= Bone stock EJ22T from a mechanical standpoint, with a RHB5 VF-11.
= 3" Downpipe mating into a 3" Moroso Steel Spiral Resonator
= Manual boost controller made out of bits and pieces.
= Walbro 255 HIGH-PRESSURE fuel pump
= Dual-feed fuel rails.
= stock EJ22T injectors
= Aeromotive 1000 series regulator set at 60PSI base pressure.
= Link G4 Storm ECU (Standalone, I wired it in)
= Dual Ignitors for when I eventually switch to direct ignition.
= Custom made intake pipe from steel stock - runs under the intake manifold. Plus a 4" Cone filter I picked up locally really cheap.
= AWIC fed by some high-pressure high-flow 12VDC pump I picked up at Harbor Freight. cooled by an inefficient transmission cooler. Looking at getting my own radiator built to do the job.
Here's the recent (last week to today) history...
I've been fiddling with my MBC, trying to get it to deliver me some boosts past 10PSI. No amount of adjustment-screw tweaking really does the job. I finally figure out that regardless of the setting, air is leaking past the check ball due to the uneven shape of the surface it sits on. Instead of trying to fix this (I actually did, somewhat unsuccessfully) I just drilled a 1/16" hole in the thing.
I took the car out for a spin then, and in a 2nd gear pull I wailed against 18PSI. AFR's were good (I was watching closely as they fell into the 10:1 range). So I did another 2nd gear pull after slowing. It was absolutely delicious. I was datalogging this, so I downloaded that map and went over some of the numbers. Everything looked good so I left it be. I like 18PSI and it pulled like nuts.
My timing is still really conservative, at that particular pressure around 5500RPMS I was only running 18 degrees timing and was seeing AFR's sinking into the low 10:1 range - safe to say, I'm not concerned about knock. I'm also using 93 octane, so that helps.
I took the car out again today, after welding up a new exhaust hanger and some other stuff.
Well, somewhere along the way the ball in my MBC stuck against the surface sealing it shut (I had to tap it to get the ball to drop out after removing the spring later on); effectively I was running without a wastegate.
while in the midsts of overspooling my turbocharger, I took a couple datalogs.
http://gallery.thelostdays.com/store/20 ... r-pull.png
This is a 1-4 gear pull I did on an open road. At the RPM I was in for 4th gear I estimated my speed to be around 85MPH, and judging by the datalog it took approximately 7 seconds of power (not counting shift times cause I was granny shifting it) to achieve that speed. I estimate the 0-60 mph would be on the order of 5.5 seconds.
The plug gap on these plugs was also 0.040" which is too wide. I turned them down tonight to 0.025" because It feels like the power is sagging off too far at high rpms.
On the 1st gear pull, I had the rear of the car step out, so I stayed in the throttle to straighten the car up, which ran me over into an RPM limiter at 6000 rpms and caused little weird things to happen on the datalog. Boost in this gear was 90kPa = 13PSI
2nd gear was stronger, boost came on strong and peaked at 17PSI tapering to 13PSI at 6000 RPMS. IDC was almost 90% as I let off the throttle.
3rd gear was stronger still with a peak at 17PSI and tapering to 13.5PSI - IDC peaked at 80% when I shifted at 5500RPM
4th was the strongest of them all. I think this is where the MBC stuck closed and the turbocharger was allowed free range. Boost rose sharply and peaked at 18PSI. The little VF-11 held this from 4000RPM to 4500RPM just fine, tapering to 17PSI before I let off. IDC peaked at 70% and AFR's were 10:1 range.
I was going at a pretty good rate and felt the car had plenty left, but I decided to slow down and see how it did from a 2000 RPM roll in 4th gear.
Well, our little VF11 spins to infinity and beyond, and at low RPMs it builds a shit-ton of boost. I don't know how much exactly because I've got a MAP limiter on which kills ignition and fuel when I cross 130kPa (20PSI), but this was the event:
http://gallery.thelostdays.com/store/20 ... rboost.png
The huge spike in AFR was a charge igniting against the hot turbine vanes in the exhaust. It sounded like a gunshot and scared the hell out of me. I thought I had thrown a rod. I was paying really close attention to the AFR's and boost as I rolled into the throttle (you can see i didn't get past 80% when the turbo hit 140kPa = 20.3PSI)
I had video of this event, but it was poorly taken so i just extracted the audio instead:
http://gallery.thelostdays.com/store/20 ... 110709.mp3
Well, this is my rally car.
The cage goes in around January, about the time I have to haul it down to Birmingham and have it custom fitted. I'm buying seats hopefully in December, and a new steering wheel as well. Next year is going to be a wild ride, this car already is! I'm hoping to get some dyno time coming up soon but I've got to find a 4 wheel dyno nearby. So far I've just been starting very conservative and tuning slowly, reviewing the logs, making adjustments, and going back out there.
I hope you guys enjoy this as much as I do!
First, this is the car:
http://www.youtube.com/watch?v=MWw5Y5Ndo4Y
This is a quick 1-2 pull I did on my street, I didn't take it any further cause this is still a neighborhood:
http://www.youtube.com/watch?v=DAXtfjN9nUo
Boost then was 15PSI peak with a 10PSI settle, I still hadn't worked out the kinks in the MBC.
So that's the short of the history, here's some specs:
= Bone stock EJ22T from a mechanical standpoint, with a RHB5 VF-11.
= 3" Downpipe mating into a 3" Moroso Steel Spiral Resonator
= Manual boost controller made out of bits and pieces.
= Walbro 255 HIGH-PRESSURE fuel pump
= Dual-feed fuel rails.
= stock EJ22T injectors
= Aeromotive 1000 series regulator set at 60PSI base pressure.
= Link G4 Storm ECU (Standalone, I wired it in)
= Dual Ignitors for when I eventually switch to direct ignition.
= Custom made intake pipe from steel stock - runs under the intake manifold. Plus a 4" Cone filter I picked up locally really cheap.
= AWIC fed by some high-pressure high-flow 12VDC pump I picked up at Harbor Freight. cooled by an inefficient transmission cooler. Looking at getting my own radiator built to do the job.
Here's the recent (last week to today) history...
I've been fiddling with my MBC, trying to get it to deliver me some boosts past 10PSI. No amount of adjustment-screw tweaking really does the job. I finally figure out that regardless of the setting, air is leaking past the check ball due to the uneven shape of the surface it sits on. Instead of trying to fix this (I actually did, somewhat unsuccessfully) I just drilled a 1/16" hole in the thing.
I took the car out for a spin then, and in a 2nd gear pull I wailed against 18PSI. AFR's were good (I was watching closely as they fell into the 10:1 range). So I did another 2nd gear pull after slowing. It was absolutely delicious. I was datalogging this, so I downloaded that map and went over some of the numbers. Everything looked good so I left it be. I like 18PSI and it pulled like nuts.
My timing is still really conservative, at that particular pressure around 5500RPMS I was only running 18 degrees timing and was seeing AFR's sinking into the low 10:1 range - safe to say, I'm not concerned about knock. I'm also using 93 octane, so that helps.
I took the car out again today, after welding up a new exhaust hanger and some other stuff.
Well, somewhere along the way the ball in my MBC stuck against the surface sealing it shut (I had to tap it to get the ball to drop out after removing the spring later on); effectively I was running without a wastegate.
while in the midsts of overspooling my turbocharger, I took a couple datalogs.
http://gallery.thelostdays.com/store/20 ... r-pull.png
This is a 1-4 gear pull I did on an open road. At the RPM I was in for 4th gear I estimated my speed to be around 85MPH, and judging by the datalog it took approximately 7 seconds of power (not counting shift times cause I was granny shifting it) to achieve that speed. I estimate the 0-60 mph would be on the order of 5.5 seconds.
The plug gap on these plugs was also 0.040" which is too wide. I turned them down tonight to 0.025" because It feels like the power is sagging off too far at high rpms.
On the 1st gear pull, I had the rear of the car step out, so I stayed in the throttle to straighten the car up, which ran me over into an RPM limiter at 6000 rpms and caused little weird things to happen on the datalog. Boost in this gear was 90kPa = 13PSI
2nd gear was stronger, boost came on strong and peaked at 17PSI tapering to 13PSI at 6000 RPMS. IDC was almost 90% as I let off the throttle.
3rd gear was stronger still with a peak at 17PSI and tapering to 13.5PSI - IDC peaked at 80% when I shifted at 5500RPM
4th was the strongest of them all. I think this is where the MBC stuck closed and the turbocharger was allowed free range. Boost rose sharply and peaked at 18PSI. The little VF-11 held this from 4000RPM to 4500RPM just fine, tapering to 17PSI before I let off. IDC peaked at 70% and AFR's were 10:1 range.
I was going at a pretty good rate and felt the car had plenty left, but I decided to slow down and see how it did from a 2000 RPM roll in 4th gear.
Well, our little VF11 spins to infinity and beyond, and at low RPMs it builds a shit-ton of boost. I don't know how much exactly because I've got a MAP limiter on which kills ignition and fuel when I cross 130kPa (20PSI), but this was the event:
http://gallery.thelostdays.com/store/20 ... rboost.png
The huge spike in AFR was a charge igniting against the hot turbine vanes in the exhaust. It sounded like a gunshot and scared the hell out of me. I thought I had thrown a rod. I was paying really close attention to the AFR's and boost as I rolled into the throttle (you can see i didn't get past 80% when the turbo hit 140kPa = 20.3PSI)
I had video of this event, but it was poorly taken so i just extracted the audio instead:
http://gallery.thelostdays.com/store/20 ... 110709.mp3
Well, this is my rally car.
The cage goes in around January, about the time I have to haul it down to Birmingham and have it custom fitted. I'm buying seats hopefully in December, and a new steering wheel as well. Next year is going to be a wild ride, this car already is! I'm hoping to get some dyno time coming up soon but I've got to find a 4 wheel dyno nearby. So far I've just been starting very conservative and tuning slowly, reviewing the logs, making adjustments, and going back out there.
I hope you guys enjoy this as much as I do!
