Does anyone know how to post a datalog from FAST? I think some of the folks in here may be interested to see what IATs do with no IC or xxOH injection.

Aaron

 

Post it to Photobucket (or similar) and go from there...It will allow you to upload Word documents, spreadsheets, or graphs.
-Jeb

 

Well, since I do not have a clear plan for posting the FAST datalog, I will attempt to detail.

I drove the car for a short trip without the benefit of IC or alcohol (xxOH) injection. I was anxious to see the impact of the reduced inlet restriction, as well as the impact on the recorded IATs.

One gear moderate pull was all I did.
10/15/06, 3rd gear, ~1/2-3/4 throttle, 75°F, in contrast to 3/25/06, 3rd gear, 3/4 - full throttle, 83°F. These were the closest logs I could find. No changes to any of the physical components, just direct from blower to TB.

10/15 7/25
Time RPM TPS Boost IAT Time RPM TPS Boost IAT
6.1 2600 30 -2.5 156.3 3.6 3850 32 -10.2 142.1
6.2 2650 31 -2.7 157.3 3.7 3750 94 2.3 141.2
6.3 2650 34 -1.6 157.3 3.8 4200 98 4.8 141.2
6.4 2750 38 -0.2 157.3 3.9 4100 98 5.3 142.1
6.5 2800 45 2.0 158.3 4.0 4200 96 5.5 143.1
6.6 2900 51 3.4 158.3 4.1 4350 96 5.7 144.0
6.7 3000 61 4.2 159.2 4.2 4500 96 5.8 144.9
6.8 3150 72 4.8 159.2 4.3 4600 94 6.0 145.9
6.9 3200 74 5.1 160.2 4.4 4700 93 6.2 146.8
7.0 3350 69 6.0 161.1 4.5 4800 93 6.5 147.8
7.1 3600 68 6.9 162.1 4.6 4850 92 6.7 148.8
7.2 3800 63 7.3 165.3 4.7 5050 92 6.5 150.7
7.3 3950 56 7.2 167.6 4.8 5200 91 7.2 151.5
7.4 3950 44 4.7 172.1 4.9 5200 89 7.4 152.6
7.5 4000 44 4.3 174.4 5.0 5400 87 7.5 154.4
7.6 4050 49 5.5 176.7 5.1 5450 87 7.8 155.4
7.7 4100 64 8.7 178.9 5.2 5550 85 8.0 157.3
7.8 4300 75 9.4 183.5 5.3 5550 82 8.3 158.3
7.9 4550 68 10.2 188.0 5.4 5750 81 8.3 160.2
8.0 4800 65 11.2 190.3 5.5 5850 79 8.5 161.1
8.1 5250 56 12.0 197.1 5.6 6050 77 8.7 163.0
8.2 5450 37 4.2 201.7 5.7 6000 73 8.6 165.3
8.3 4250 27 -7.2 201.7 5.8 6050 69 8.6 169.8
8.4 4200 25 -9.2 203.9 5.9 6250 65 8.2 172.1
8.5 3950 24 -9.9 203.9 6.0 6300 63 8.0 176.7
6.1 6450 51 6.0 178.9
6.2 5800 20 -5.1 181.2
6.3 5400 19 -10.0 183.5
6.4 4850 19 -11.9 183.5

The older run with the Spearco IC (3.5" thick) went up to 226°F IAT by the time I finished with 4th gear.

Conclusions:
- It appears that I was pulling ~7.7 psi boost at ~5200 RPM (and I confirmed just over 8 psi on the dyno runs at 5200). Without the IC and associated 3" piping, the boost jumped to 12 psi at 5200.
- The cruising IAT is in the 130°-140°F range without the aid of IC, while with the IC, the IATs at cruise were typically at or below 100°F.
- The cooling ability "reserve" is gone after removal of the IC. Here is where I believe that xxOH inj manufacturers caution on retaining the IC (even if it is a bit small for the system). I have had them advise to get a small, but not restrictive IC to allow some cooling capacity when off the xxOH.

Once I feel that the xxOH injection is tuned properly, I will definitely await the boost results at higher RPM. I think I will be back in the 3 bar range at redline. Woohoo!

Aaron

 

Jeb,
Thanks for the info. I will try to upload to photobucket. Unfortunately, I had started typing the values this AM, and did not see your message prior to posting.

Thanks again,
Aaron

 

Hummmm....thats interesting Aaron....thanks for the info....I was seeing 120 to 130 with the procharger intercooler during cruise....hot engine and summer months........didn't cross my pea brain to check it after removing the intercooler I was to excided on gaining the extra boost..........great post

 

How much boost did you gain following removal of the IC and associated piping? I had people estimate 7 psi, but I was running the 3" piping throughout, along with the considerably larger Spearco IC. I would be satisfied with 3.5 - 4 psi increase

Historical tracking of the boost on my '87:
3.5 psi - 350 ci, heads cam, 11.2:1 scr, SR, decent HR cam, 58MM, P-600B, 5200RPM
8.0 psi - 2.4" pulley from 2.85" stock that was supposed to make 12 psi, 5600 RPM
6.8 psi - swapped to 2.25" pulley, massive slip
10.3 psi - back to 2.4", just spun to 6050 RPM
9.5 psi - Same as basic mods above, swapped to D1, 5600 RPM
7.8 psi - New combo, 4" stroke, monster SR, MRII, D1R, 5900 RPM
8.5 psi - same as new combo, just swapped to the 8" K&N vs the 5"
10.5 psi - many small changes, pulley change, went to SD, 6200 RPM
13.5 psi - cog drive, rough on components, 6000 RPM
12.5 psi - back to 6 rib, small changes, maxed out impellor, 6200 RPM
10.2 psi - swapped intake C4SP, MB, and more head work, 6400 RPM
12.0 psi - this is where I am now, 5200 RPM

I think that she will go to 15+ psi when I spin to 6200 RPM. I have had the occasional 14 psi run in the past on nights where it was quite cool and it seemed like everything was perfect. I hope to finally be able to use that 3 bar MAP on a consistant basis.

The car will absolutely blaze the tires when it goes above 5 or 6 psi in 3rd or 4th, and this is with my fairly new DRs. On the dyno back in July, I was at 748 lb-ft at 5230 RPM and 8.2 psi. For the rest of the run, I only bettered that by ~30 lb-ft. I am hoping to pick up 70 lb-ft as the dyno operator has claimed with xxOH. He was claiming this just on the xxOH and timing, not on additional boost. My ECR will be ~19.4:1 (at 15psi), which will be a bit above the 18.8:1 which is considered "safe" for the LS1 engines (no one has an opinion on the L98/LTx blocks, or so it seems).

Thanks for the comments. I am excited about the recent changes.
Aaron

 

I got a 4 psi additional increase at summer temps(90 to 100 degress} and an additional 1 or 2 psi in the fall ...spring temps.........summer is the only time I can let the dogs lose, in the cooler temps its almost uncontrollable and I have no were near the hp you do......just keep it straight when you nail it

 

Thanks for the reply. So you went from what psi to what psi? Are you running xxOH injection now? Who's injection? No IC now? Did you do any before and after dyno runs?

Thanks for the info.
Aaron

 

Aaron... while you are viewing the screen you want to post... hit the prt scr/sysreq button top right of the keyboard... then open MS paint from the start menu/programs/accessories/MSPaint and from the "EDIT" menu on the top tool bar, hit paste.. then hit file/save as/ give it your image name and email it to me and I will host it for you.. this saves a gif/jpg/bitmap image of the screen you were viewing..

email it to Lcvette1@aol.com

I will have it up a few minutes later.. I like seeing the actual graphs.. I wanna see what the fast screen looks like compared to my DFI..

Chris

 

Started with a stock engine l98....added a p600b @8 psi....built the engine,big heads, forged pistons, crank,blower cam,SR intake,58mm tb, headers.exhaust ect. and psi went to 4psi.....installed a 2.25 pulley(prochargers 12 psi) and got 6 psi @ max impeller speed @ 6500 rpm...so I removed the intercooler and added a snow xxoh injection system and psi went to 10 psi in the summner and 11, 12 during the colder momths........haven't had it on a dyno yet. right now I'm playing with the spark timing and have unhooked the xxoh injection because it's so cold here in the mountain valleys.........by the way I'm at 4600 ft altitude so I'm loosing boost there that you won't

 

I can't believe that you were avble to get higher boost with the 2.25" pulley. AS mentioned above, I had the 2.85", then went to the 2.4" and all was good. I wound up going to the 2.25" and lost boost. I was having a lot of slippage, and I even had the "wrap mod" on the idler.

Do you have any idea of what your IATs are when you are running the car hard (like a full 1/4 mile blast)? I am hoping that with the xxOH inj that the start of 135°F will actually drop as the injection ramps up.

Thanks for sharing all of the info above.
Aaron