Vegas Smith
20+ Year Contributor
- 5,191
- 3,108
- Dec 2, 2002
-
Houston,
Texas
Sorry to hear about the turbo. What are your expectations on what they'll say? Think you'll run this turbo again or move onto something else?
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From what I’ve read through researching when a shaft snaps it’s usually due to oil starvation at those kinds of RPM’s that is. I was feeding it from the head so maybe it wasn’t enough or had a moment where it caught an air pocket somehow. Comp recommends 30-40psi oil pressure once you start getting it up on the rpms and they provide a restrictor that is .018” for anything over that. Ball bearings turbos usually don’t need a lot of oil to keep them lubed I didn’t have any issues with the super 99 but that also had a bigger diameter hub shaft. So at this point I’m just going to see what they say I checked the turbo after every pass no signs it was seized up, no shaft play, no smoke out of the exhaust at the end of the pass. I’ll switch back to feeding from the ofh where my sensor is which also has my failsafe parameters activated and log crankcase pressure just for peace of mind never done that but at this point I just need to see what the car is doing. I will say if comp says I need to cover the entire cost I’ll be moving back to my original plan of a xona 9569s or just say screw it and wait for a used pte 7285 to pop up for sale. The second option would most likely be the end of my season due to the fact FP is so backed up from waiting on materials to build their turbos. I would like to give the comp one more try after I see what they recommend for a fix on my end because I’m telling you this thing was making way more jam than the super 99 did at the same boost level. Nitrous was shutting off at 20psi around 5400rpm and this was on a 50 shot and it hit 151mph @47psi. The super 99 I had a 100 shot on until 145mph and it hit 154 at 53-54psi with nitro assistance.Sorry to hear about the turbo. What are your expectations on what they'll say? Think you'll run this turbo again or move onto something else?
Thank you and I’m glad to hear my build thread has gave you some advice. Which version super 99 do you have and what hotside? There were a couple changes to the turbine wheel in size throughout the years.Awesome work man!
Your build has gave me some advice! Thank you for sharing .
I have a super 99 on the shelf been having a hard time making my mind to swap it in vs the 6766…
Almost seams like it’s not worth the swap after reading your experience on the super 99 running out of steam ..
Oh man that sucks. I met a few new old time DSMer’s. It would have been nice to meet you in person maybe Tulsa in June.Im so out of touch Im in okc and didnt know it was happening
I didn't catch did you say you are or aren't running the taller transfer gears? I've been debating on which route to go for my setup.Made the trip down to OKC IFO yesterday. Made 2 hits in qualifying, qualified number 1. Round 1 eliminations sprung a leak at the fuel tank. Guy I was paired with wouldn’t wait for me to fix so I was disqualified. The passes sided a 50 shot to stall up and about 20ft out it shut off. A-B tune-up conservative was 9.1 not too shabby. Uploaded some videos instead of having to write it all out. I’ll be back soon for more.
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I tried out the 7% gears last season. I swapped standard ratio back in the car over winter. I had quite a few personal discussions with Aaron Gregory on them so I figured it was worth a shot. From my findings if you aren’t running a stroker motor or hitting we’ll say 9800+ RPM going through the traps it’s not worth it. The hardest part about the auto is finding the converter that fits your setup. I’m running a #8 precision from Jeff Bush kit 1G flavor and I was crossing the traps at just about 8850-8900 151MPH. If I were running the 7% gears still at this power level my RPM would have been roughly 82-8300. My peak torque no dyno to confirm just using my fuel map is right in the 7500-7700 range and my car makes peak power just north of 9K. The 7% gears 2-3 shift would drop me out of my power curve making me run slower. I see a lot of guys go straight for the number 6 precision converter and it’s honestly to tight for them. Kiggly shared some data with me that showed the difference between the 8,7 and 6 is roughly 300 rpm tighter between each one up top. It’s a long winded response but I do hope it helps you decide.I didn't catch did you say you are or aren't running the taller transfer gears? I've been debating on which route to go for my setup.
That makes sense I'm starting on the #8 from Jeff, and planning on going 2.0L long rod. I'm still looking for a set of standard gears. Jeff has been back ordered on them for months.I tried out the 7% gears last season. I swapped standard ratio back in the car over winter. I had quite a few personal discussions with Aaron Gregory on them so I figured it was worth a shot. From my findings if you aren’t running a stroker motor or hitting we’ll say 9800+ RPM going through the traps it’s not worth it. The hardest part about the auto is finding the converter that fits your setup. I’m running a #8 precision from Jeff Bush kit 1G flavor and I was crossing the traps at just about 8850-8900 151MPH. If I were running the 7% gears still at this power level my RPM would have been roughly 82-8300. My peak torque no dyno to confirm just using my fuel map is right in the 7500-7700 range and my car makes peak power just north of 9K. The 7% gears 2-3 shift would drop me out of my power curve making me run slower. I see a lot of guys go straight for the number 6 precision converter and it’s honestly to tight for them. Kiggly shared some data with me that showed the difference between the 8,7 and 6 is roughly 300 rpm tighter between each one up top. It’s a long winded response but I do hope it helps you decide.
Call liberty gears directlyThat makes sense I'm starting on the #8 from Jeff, and planning on going 2.0L long rod. I'm still looking for a set of standard gears. Jeff has been back ordered on them for months.
Thank you! It’s that time of the year for everyone to get PB’s. I was really banking on the shootout with awesome track prep, great people in the community and the boost weather. There is always next year though.Congrats on your PB! That thing is moooving!