turbo reliability on track
#121
The SFR SCCA SM crew was pretty skeptical of the black car, until Nick brought it to a double regional, qualified 9+ seconds under SM pole, and kicked some *** in ITE. Before the event, we got questions about why things were done differently - after the event, we got questions about why the different things were better
again, you need better zip ties....
#123
What went wrong
Stuff Miata track turbo guys do wrong
- No hood vents
- Hood vents in the wrong location, i.e behind #3 cylinder
- No full coverage undertray
- Radiator core not 100% sealed for air leakage around it
- No reroute
- #6 or #5 plugs
- Stock coils
- NA batch fire ignition
- NA6 batch fuel
- Pump gas of 92 or lower octane
- Non-Inconel manifold studs
- OTS BEGI or FM manifold w/o turbo support brace
- OEM Garrett internal wastegate and >10psi instead of VTA
- Too small VTA BOV
- Intake pipes without beads
- Intake pipes held on with ordinary worm drive hose clamps
- Throttle plate not epoxied
- Solid motor mounts broke other stuff on car
- OEM diff mounts - broken exhaust
- No V-Band in DP
- OEM Rods
- OEM pistons
- OEM oil pump
- No clutch bypass for starting leading to toasted thrust bearings
- No oil cooler
- No trans cooler
- No diff cooler
- 5 speed transmission (went through at least four I bet)
- Rubber lines for turbo oil and/or coolant
- Restrictive tube/Fin I/C from big name American company instead of superior Chinese Bar/Plate off ebay (who knew)
- Piggy back ECU
- >13psi with NA cam/crank angle sensor + ragged edge tune = det
- No WB02
- WB02 in wrong place
- No EGT
- Coolant temp sensor at front of head
- Heater bypass w/o restrictor
- OEM 16psi rad cap instead of 19psi Koyo/Stant
- Too few/misaligned exhaust hangers = cracked DP
- Bad welds, cracked DP or exhaust
- 5th injector in manifold
- RX7 460cc injectors
- RC engineering injectors
- No det cans used during dyno tuning
- Boost turned up after dyno, then raced
- Boost turned up way past highest efficiency island on compressor map
- Zero safeties built in to ECU (overboost,EGT,WB02,coolant pressure etc)
- Insufficient heat shielding for heater hoses, master cylinder, trans tunnel
- More than one change in intake pipe cross section dimension between compressor-I/C or I/C- TB.
- Under drive pulleys
- Road tune only for WOT/peak boost only (no steady state part throttle dyno tune)
- $25 junkyard turbos
- Non-water cooled turbo
- Koni yellows with GC coilovers
- Spec Miata suspension
- OEM rubber suspension bushings
- NA6 diff
- Open diff
- more rear camber than front
- Anything less than 9" wheels
- 205/50/15's
- Zero front aero but tons of drag/lift inducing cooling holes in vain attempt to stop overheating
- No wing
- No hard top
- Bolt in cage
- NA8 brakes with Hawk Blues
- OEM bone stock hubs
- OEM end links
- A/C components still in car
- >2400lb comp weight
__________________
#126
mkturbo.com
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Location: Charleston SC
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A reroute is generally a good idea if you car is boosted and you will be tracking it. Unless you have an 01-05 VVT motor and are running the stock head gasket. Honestly I would want a reroute and big radiator on track even without boost.
#128
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,175
Total Cats: 1,129
I'll take some educated guesses at some of the mistakes curly made. Mistakes myself and everyone else here has made at some point. Willing to bet his team made at least 75% of these throughout development and still had 25% when they finally threw in the towel
Stuff Miata track turbo guys do wrong
Stuff Miata track turbo guys do wrong
- #6 or #5 plugs
- NA batch fire ignition
- NA6 batch fuel
- Non-Inconel manifold studs
- OTS BEGI or FM manifold w/o turbo support brace
- OEM Garrett internal wastegate and >10psi instead of VTA
- Too small VTA BOV
- Intake pipes without beads
- Intake pipes held on with ordinary worm drive hose clamps
- Throttle plate not epoxied
- Solid motor mounts broke other stuff on car
- OEM diff mounts - broken exhaust
- No V-Band in DP
- OEM Rods
- OEM pistons
- OEM oil pump
- No trans cooler
- No diff cooler
- 5 speed transmission (went through at least four I bet)
- >13psi with NA cam/crank angle sensor + ragged edge tune = det
- No EGT
- Heater bypass w/o restrictor
- OEM 16psi rad cap instead of 19psi Koyo/Stant
- Too few/misaligned exhaust hangers = cracked DP
- Bad welds, cracked DP or exhaust
- RX7 460cc injectors
- RC engineering injectors
- No det cans used during dyno tuning
- Boost turned up after dyno, then raced
- Insufficient heat shielding for heater hoses, master cylinder, trans tunnel
- More than one change in intake pipe cross section dimension between compressor-I/C or I/C- TB.
- Road tune only for WOT/peak boost only (no steady state part throttle dyno tune)
- Non-water cooled turbo
- Koni yellows with GC coilovers
- OEM rubber suspension bushings
- Open diff
- 205/50/15's
- Zero front aero but tons of drag/lift inducing cooling holes in vain attempt to stop overheating
- No wing
- Bolt in cage
- OEM bone stock hubs
- OEM end links
#129
lol, me too. i think some of that might be more endurance racing than trackday or sprint race car. here's my ahem, hm, shortcomings.
Stock coils (seem to last 2 yrs.)
Non-Inconel manifold studs (tack weld turbo to mani.) will call trackspeed when i replace this turbo and go inconel
OTS BEGI/FM prototype manifold w/o turbo support brace. 10yr/100k mi. on it
a few pipes held on with ordinary worm drive hose clamps
Throttle plate not epoxied
OEM diff mounts - never broke exhaust, but my exhaust guy is legendary 'round here
No V-Band in DP
OEM oil pump (afaik)
5 speed transmission (broke original 180k mi. tranny, car was drag racer until i bought it) i practice mechanical empathy shifting
RC engineering injectors
OEM rubber suspension bushings
Stock coils (seem to last 2 yrs.)
Non-Inconel manifold studs (tack weld turbo to mani.) will call trackspeed when i replace this turbo and go inconel
OTS BEGI/FM prototype manifold w/o turbo support brace. 10yr/100k mi. on it
a few pipes held on with ordinary worm drive hose clamps
Throttle plate not epoxied
OEM diff mounts - never broke exhaust, but my exhaust guy is legendary 'round here
No V-Band in DP
OEM oil pump (afaik)
5 speed transmission (broke original 180k mi. tranny, car was drag racer until i bought it) i practice mechanical empathy shifting
RC engineering injectors
OEM rubber suspension bushings
Last edited by spoolin2bars; 12-14-2011 at 08:07 PM.
#132
Former Vendor
iTrader: (31)
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 15,442
Total Cats: 2,099
Search "broken throttle shaft" on m.net. Basically, the shaft breaks and/or the screws back out, the engine ingests them, and sometimes its fatal. Just smear some normal 2-part epoxy over the screws to hold them in place.
#139
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
lol, me too. i think some of that might be more endurance racing than trackday or sprint race car. here's my ahem, hm, shortcomings.
Stock coils (seem to last 2 yrs.)
Non-Inconel manifold studs (tack weld turbo to mani.) will call trackspeed when i replace this turbo and go inconel
OTS BEGI/FM prototype manifold w/o turbo support brace. 10yr/100k mi. on it
a few pipes held on with ordinary worm drive hose clamps
Throttle plate not epoxied
OEM diff mounts - never broke exhaust, but my exhaust guy is legendary 'round here
No V-Band in DP
OEM oil pump (afaik)
5 speed transmission (broke original 180k mi. tranny, car was drag racer until i bought it) i practice mechanical empathy shifting
RC engineering injectors
OEM rubber suspension bushings
Stock coils (seem to last 2 yrs.)
Non-Inconel manifold studs (tack weld turbo to mani.) will call trackspeed when i replace this turbo and go inconel
OTS BEGI/FM prototype manifold w/o turbo support brace. 10yr/100k mi. on it
a few pipes held on with ordinary worm drive hose clamps
Throttle plate not epoxied
OEM diff mounts - never broke exhaust, but my exhaust guy is legendary 'round here
No V-Band in DP
OEM oil pump (afaik)
5 speed transmission (broke original 180k mi. tranny, car was drag racer until i bought it) i practice mechanical empathy shifting
RC engineering injectors
OEM rubber suspension bushings