More track testing and trouble (typical turbo car)
04-23-2009, 01:50 PM
#1
More track testing and trouble (typical turbo car) Went to Midnight Mayhem at LVMS this past friday to do some more testing.
Changes made since the last outing are:
ET Street radials 275/60/15 vs the ET Streets 28x12.50x15.
Strange dual adjustable shocks.
Big honking boost leak from the throttle body where it connects to the evap purge solenoid (DOH!).
Got to the track later than usual and was car 248 of 5xx for the night (F me!) so the left over track prep from the previous PSCA event goes away super fast with FWD street tire burnouts dragging water all over.
1st pass
15psi
1. 10.48@131 [1.58 60'] on a 5psi launch @ 3800 rpms on the two step. Went 6.7 @ 105 in the 1/8.
2. 11.4@X [1.52 60'] on a 10psi launch @ 4100 rpms on the two step. Went 6.5 @ 98 in the 1/8. I was in and out of the throttle somewhere between the 60' and 330' due to detonation and just drove it normal down the track the rest of the time. It felt like it spun 5-10' after the initial hit before it hooked but felt like a killer launch when it did.
3. 14psi boost, 10.9@130 [1.92 60'] on 9-10psi launch @ 4000 rpms on the two step. As you can guess I spun hard, peddled, hooked back up and ran.
All these passes were done with the boost leak at the throttle body which I figured out after the 2nd pass when I decided to investigate my high idle closer. Boost leak was causing the turbo to work extra hard which probably spiked my IATs (I wasn't data logging this time). 0.25 hole doesn't help to hold the boost in.
Not a great outing to the track, but not bad either. New shocks seem to help with the weight transfer so we played with them. The two step seems to be very sensitive for getting the desired launch boost. I think 10psi will work well when I get on the track with it prepped decent, hoping for 1.4x 60's.
Scales were open so I drove on... 3890lbs with me in it and 1/3 tank... definitely an American car.
Next time out front end should have an nice weight reduction between 19-50lbs on top of the 10lbs the shocks have already saved.
Changes made since the last outing are:
ET Street radials 275/60/15 vs the ET Streets 28x12.50x15.
Strange dual adjustable shocks.
Big honking boost leak from the throttle body where it connects to the evap purge solenoid (DOH!).
Got to the track later than usual and was car 248 of 5xx for the night (F me!) so the left over track prep from the previous PSCA event goes away super fast with FWD street tire burnouts dragging water all over.
1st pass
15psi
1. 10.48@131 [1.58 60'] on a 5psi launch @ 3800 rpms on the two step. Went 6.7 @ 105 in the 1/8.
2. 11.4@X [1.52 60'] on a 10psi launch @ 4100 rpms on the two step. Went 6.5 @ 98 in the 1/8. I was in and out of the throttle somewhere between the 60' and 330' due to detonation and just drove it normal down the track the rest of the time. It felt like it spun 5-10' after the initial hit before it hooked but felt like a killer launch when it did.
3. 14psi boost, 10.9@130 [1.92 60'] on 9-10psi launch @ 4000 rpms on the two step. As you can guess I spun hard, peddled, hooked back up and ran.
All these passes were done with the boost leak at the throttle body which I figured out after the 2nd pass when I decided to investigate my high idle closer. Boost leak was causing the turbo to work extra hard which probably spiked my IATs (I wasn't data logging this time). 0.25 hole doesn't help to hold the boost in.
Not a great outing to the track, but not bad either. New shocks seem to help with the weight transfer so we played with them. The two step seems to be very sensitive for getting the desired launch boost. I think 10psi will work well when I get on the track with it prepped decent, hoping for 1.4x 60's.
Scales were open so I drove on... 3890lbs with me in it and 1/3 tank... definitely an American car.
Next time out front end should have an nice weight reduction between 19-50lbs on top of the 10lbs the shocks have already saved.
04-23-2009, 03:28 PM
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6.5 @98 at one of ur sea level florida tracks would be hooking ok-
Cant wait to see a full pass on the Zombie as it sits - The car had a drasticly improved time on a soft run that started to detonate and required him to lift- The slight changes are looking to make good improvements on a clean pass.
Cant wait to see a full pass on the Zombie as it sits - The car had a drasticly improved time on a soft run that started to detonate and required him to lift- The slight changes are looking to make good improvements on a clean pass.
04-23-2009, 07:12 PM
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How much timing are you retarding/advancing with your 2-step.
I have read most of your threads about your 2-step testing.My timing starts at 18*, I pulled 5* and got 3.5 psi that equaled a 1.56 60ft. I wasn't sure if it was really even pulling timing so we hooked it up to HPtuners vcm scanner. After adjusting the timing up and down we ended up pulling 12* and getting 6.2 psi. I know you have an auto so it's not really the same since you are putting some what of a load on the car. I am going to the track this weekend to see if the tires can handle a harder launch.
I have read most of your threads about your 2-step testing.My timing starts at 18*, I pulled 5* and got 3.5 psi that equaled a 1.56 60ft. I wasn't sure if it was really even pulling timing so we hooked it up to HPtuners vcm scanner. After adjusting the timing up and down we ended up pulling 12* and getting 6.2 psi. I know you have an auto so it's not really the same since you are putting some what of a load on the car. I am going to the track this weekend to see if the tires can handle a harder launch.
04-23-2009, 07:58 PM
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No timing retard. Its an older unit with out retard. After the initial 1.58 60 I went two clicks stiffer on rebound on the front. I also went up on the two step from 3800 (1.58 ) to 4100 (1.52) . I thought it would go a 1.52 or 1.53 so atleast it was the right direction. Zombie said the boost went from 4-5 on the 1.58 to 10 or so on the 1.52......so for the third pass the two step was turned down to 4000. By then the tarck was gone....
I also had the tires at 18 psi warm. At 18 it looked like the tire was working pretty hard.
I also had the tires at 18 psi warm. At 18 it looked like the tire was working pretty hard.
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04-24-2009, 10:11 AM
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its funny, but after I wrote that, I thought....I think it was two clicks one way and one the other......I guess thats what happens when you dont sleep much. Since monday I ve probably gotten 8 total hrs of sleep. Im pretty sure at this point I d have to actually check them to see were they are set.
I do remember though, when I was under the car at the track, thinking, 1.58....hmmmmm this ot to do it....it should go 1.52...or 1.53, then it did.
Next time out 1.4's, and maybe a 9 sec slip, but it might be too late, the heat is here. A lower 1.4 would do it, but the mph is gonna suck form the heat.
I do remember though, when I was under the car at the track, thinking, 1.58....hmmmmm this ot to do it....it should go 1.52...or 1.53, then it did.
Next time out 1.4's, and maybe a 9 sec slip, but it might be too late, the heat is here. A lower 1.4 would do it, but the mph is gonna suck form the heat.