Well, I finally finished installing and sorting out most of the issues I had encountered while installing my upgrade from a BR Stg3 to a BR Stg 4 + BR440. (None of the issues were directly related to the turbo kit or other Stg 4 parts... big thanks to David Buschur for dealing with my crap and getting me the parts I needed to replace.)

After all was said and I done I was quite happy with the increase in power. I was kind of curious to see how much of an improvement the new turbo made. Since I didn't do any baselines on a stationary dyno I pulled some old log data I had collected last April. I overlaid this data with a pull I did last night with the Stage 4 + BR440 and plotted the two runs. I think the Stage 3 numbers correspond with quoted figures I've seen for the BR Stage 3 on a Dynojet (290-320whp). If the numbers are in the ballpark, I'm pretty happy with them. Based on the performance of the Stage 3 at trackdays, I think the numbers are pretty close. In the straights I could usually walk E43 M3s, keep up with Z06s and at my last track event, I totally bewildered a guy in an '04 AMG E55. He couldn't figure out why he couldn't walk me in the straights.

What I'm really happy with is the spool and the huge increase of torque across the rpm band. The strong pull all the way to the redline is great too. It absolutely slams into the rev limiter now. The new turbo is also really loud. Even with the Magnaflow option on the BR exhaust it almost sounds like a sport bike when at WOT.

Bear in mind that these numbers are rough estimates. The weather conditions for each of the days that this data was collected were different. I have no way of plugging in any kind of correction factors to compensate for humidity or temperature. Regardless, the gains are significant and the spool is very close to stock. I think with a further amount of fine tuning, spool up could be improved. I might investigate what sort of gains can be had with a mildly ported and polished head.


Boost: ~20psi
Octane: 93
Stg 3: High flow cat
Stg 4+: Catless
Note: "Custom Flash" = Dynoflash

 

Looking good Steve I bet you are rely killing those tires now lol

 

If both "runs" are close to the same conditions thats a nice , REALY nice gain in HP !

 

Congrats. Those are really nice usable gains.

 

Yeah, I know. I was hesitating to even post this info. Basically the runs were done 6 months apart and I didn't collect ambient conditions for either run. Originally I did the run on the BR440 to see where it was hitting peak torque. Overlaying the older data was an afterthought to see how it compared to the stock turbo. The gains are definately huge but by no means can they accurately quantified by these two different runs. The gains could be overstated by as much as 20-25hp but I really just don't know. I probably should have titled my post a little differently. I'm certainly not trying to tout fluffed up dyno numbers. I'm thinking the are fairly comparable because I'm not seeing any major amounts of timing get pulled on either run. Even so, a gain of 50-60whp will keep me satisfied for at least another 6 months. As I said, I'm really happy with the spool and top end pull. I was afraid the 440 would be slow to spool and too laggy. Eventually I'll get the car to a dyno day and see if I can compare it to other cars under similar ambient conditions.

 

I was not tryin to take anything away from you , 50-60 hp is a dam good bolt on , @ 20psi and on pump gass ... keep us updated

 

I am impressed with the spoolup. There isn't near the lag I thought there would be. You only loose a little down low and by 4400 rpm it's a totally different beast.

 

No, it's all good. I should have crunched the numbers little better. I went back and looked at historical data for that first run and plugged in the data into a correction factor calculator I found on the net. I *think* those figures are within 5% or so, 10% at worst case which would put it around a 65hp gain.

Correction Factor Calculator

Farmer's Almanac Historical Weather Data

 

Man you got to take it to the track , this is the 3rd or 4th time ive looked at your graph and said "wow" .

 

Any worries running that much power while roadracing / track events. I'm just curious of the logevity of the engine. If it works our well, this would make a very fast track car. (Faster than they already are...

 

I'm a little worried about cooling, especially during the summer months but I've never had a problem previously while at the track. The ECU will do a good job at enriching the mixture when the coolant gets hot. You can actually see the injector duty cycle increase from run to run as more fuel is added to compensate for the heat soak of the coolant.

 

WOW- nice torque curve. Your graph & driving feedback doesnt show much of a loss with regards to lag!

awesome.

 

I need to get my boost signal hooked up so I can plot manifold pressure between shifts. This will give a nice picture of spool and lag.

 

what cams are you running, the 264's right.

 

Yep. 264s.

Complete mod list:
Buschur Racing FMIC
Buschur Racing Upper Intercooler Pipe
Buschur Racing 3" TB Exhaust (currently using off road pipe)
Buschur Racing Mini Battery
Buschur Racing Intake & Cone Filter
BR440 Turbo kit
HKS 264/264 Cams
Hallman MBC
ARP head bolts
Dynoflash custom tune
ECU+ (currently 'out of band'. Provides SAFC-like functionality, timing adjustment & extensive datalogging)

Other stuff:
Autometer Cobalt electronic boost gauge
Defi D-series Oil Pressure/Temp
Innovative Motorsports Wideband O2 w/ dash mounted analog gauge.
Stasis Rotors