Buschur Racing twin Walbro review w/ DLL dyno and datalogs @ 30psi 93 octane
Apr 12, 2008, 10:13 AM
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Buschur Racing twin Walbro review w/ DLL dyno and datalogs @ 30psi 93 octane
big thanks to bushcur for making such a good and inexpensive solution for 500+awhp cars. Shipping was fast and Nick was pleasant to work with as well. 
let me preface this review with some data.
I've been on the stock ecu/mas running 30psi on a BR HTA 35R with 93 octane and PTE 880cc injectors with a single walbro fuel pump plus a kenne bell boost a pump cranked all the way up. I kept adding fuel at high rpm in the ROM and eventually I got the AFR where I wanted it but the IDC was 110% peak.
I pulled the single pump and kenne bell boost a pump, installed PTE 1000cc injectors and the Buschur Racing twin walbro kit.
The kit comes with a hobbs pressure switch so that when you're off boost it only runs one of the pumps. Once you get ~ 3psi+ the second pump kicks in.
The twin pump kit uses most of the factory fuel pump assembly so the install/removal is similar but a section of factory hose is replaced with twin hoses. It's a little tricky to get it all to line up but not too bad. You'll run a wire from the battery/hobbs switch back to the pump.
Tuning was a little tricky, there's way too much fuel at part throttle but I was able to dial it in eventually and now you can't tell it has a massive fuel supply at all, feels like stock driveability again
I did a few 3rd gear pulls and DLL is showing ~500awhp currently which is good for this warmer weather we've been having.
log from that pull: looks like I'm hitting about 86% IDC now, much better.
FYI current mods are:
BR HTA 35R @ 30psi on 93 octane
HKS 280 cams
PTE 1000cc injectors
BR twin walbro fuel pumps
BR 3" tbe, test pipe, bullet muffler
BR 3" intake pipe + Mas adapter
BR UICP
BR Mini Battery
BR Race FMIC
ARP head studs
PPI ported stock intake manifold
PPI 65MM throttle body
Exedy Twin Disc HD clutch
My tuning www.mellontuning.com
The next round of mods will be:
Buschur Racing built 2.0l
Buschur Racing built head
Buschur Racing BF 272 cams w/springs and retainers.
It'll be really interesting to see how much air I'll be able to flow at the same boost after the shorty/head/cam upgrades.
let me preface this review with some data.
I've been on the stock ecu/mas running 30psi on a BR HTA 35R with 93 octane and PTE 880cc injectors with a single walbro fuel pump plus a kenne bell boost a pump cranked all the way up. I kept adding fuel at high rpm in the ROM and eventually I got the AFR where I wanted it but the IDC was 110% peak.
I pulled the single pump and kenne bell boost a pump, installed PTE 1000cc injectors and the Buschur Racing twin walbro kit.
The kit comes with a hobbs pressure switch so that when you're off boost it only runs one of the pumps. Once you get ~ 3psi+ the second pump kicks in.
The twin pump kit uses most of the factory fuel pump assembly so the install/removal is similar but a section of factory hose is replaced with twin hoses. It's a little tricky to get it all to line up but not too bad. You'll run a wire from the battery/hobbs switch back to the pump.
Tuning was a little tricky, there's way too much fuel at part throttle but I was able to dial it in eventually and now you can't tell it has a massive fuel supply at all, feels like stock driveability again
I did a few 3rd gear pulls and DLL is showing ~500awhp currently which is good for this warmer weather we've been having.
log from that pull: looks like I'm hitting about 86% IDC now, much better.
Code:
RPM KnockSum LoadMUT2Byte InjDutyCycle 2531.25 0 70.3125 5.94 2531.25 0 86.5625 9.18 2562.5 0 87.8125 7.653333333 2593.75 0 88.75 7.746666667 2625 0 89.0625 8.4 2656.25 0 90.625 8.5 2687.5 0 92.1875 8.6 2750 0 94.0625 9.386666667 2781.25 0 96.5625 9.493333333 2843.75 0 98.75 10.31333333 2843.75 0 101.25 10.31333333 2906.25 0 102.5 11.16 2937.5 0 104.6875 11.28 3000 0 108.125 11.52 3031.25 1 110 11.64 3093.75 1 111.5625 12.54 3125 2 114.6875 12.66666667 3187.5 2 116.25 12.92 3250 1 118.125 13.17333333 3312.5 1 119.0625 13.42666667 3375 1 122.5 13.68 3437.5 1 126.5625 14.66666667 3500 1 129.6875 14.93333333 3562.5 0 131.875 15.96 3593.75 0 135.3125 16.1 3687.5 0 142.8125 16.52 3718.75 0 147.5 17.45333333 3812.5 0 155.3125 18.70666667 3875 0 168.75 19.84 3937.5 0 175.3125 21.84 4000 0 183.125 22.18666667 4125 0 191.875 25.52 4187.5 0 213.125 28.58666667 4281.25 0 228.75 31.96666667 4375 0 262.1875 38.26666667 4531.25 0 291.875 46.4 4687.5 0 277.5 49 4781.25 0 289.6875 51 4937.5 1 303.4375 54.77333333 5093.75 1 307.1875 58.68 5281.25 0 313.4375 60.84 5437.5 0 321.25 62.64 5593.75 0 325 65.63333333 5781.25 0 330.3125 67.83333333 5906.25 0 330.9375 69.3 6093.75 0 339.0625 71.5 6250 0 340 74.66666667 6375 0 345.625 77.52 6593.75 0 344.375 78.77333333 6718.75 0 343.4375 80.26666667 6875 1 340.9375 80.66666667 7093.75 1 344.375 81.72 7218.75 0 341.875 83.16 7343.75 0 338.4375 83.03333333 7531.25 0 337.5 83.54666667 7625 0 335 84.58666667 7750 0 332.8125 85.97333333 7875 0 327.8125 85.68 7968.75 0 327.8125 86.7
FYI current mods are:
BR HTA 35R @ 30psi on 93 octane
HKS 280 cams
PTE 1000cc injectors
BR twin walbro fuel pumps
BR 3" tbe, test pipe, bullet muffler
BR 3" intake pipe + Mas adapter
BR UICP
BR Mini Battery
BR Race FMIC
ARP head studs
PPI ported stock intake manifold
PPI 65MM throttle body
Exedy Twin Disc HD clutch
My tuning www.mellontuning.com
The next round of mods will be:
Buschur Racing built 2.0l
Buschur Racing built head
Buschur Racing BF 272 cams w/springs and retainers.
It'll be really interesting to see how much air I'll be able to flow at the same boost after the shorty/head/cam upgrades.
Last edited by Mellon Racing; Apr 12, 2008 at 10:19 AM.
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Apr 12, 2008, 09:01 PM
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I'm not a fan of those things...tried a half dozen of them on my Stealth and the tune was always drifting off when the temperature changed...not acceptable.
Apr 13, 2008, 03:50 AM
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what kinda tricks did you do to tackle the issue of exess fuel at partial throttle???
keep us updated...i love how solid and consistant your numbers are.
thanks.
keep us updated...i love how solid and consistant your numbers are.
thanks.
