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#1 |
Registered Member
Join Date: Jul 2004
Posts: 18
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![]() Went to the track last night looking for 12s. My best ET to date is 13.34 and my best MPH is 104.90. This time and MPH were obtained in ~75* weather in clear conditions, the exact same as last night.
So as to my runs....I gained.8 on my ET and lost 7mph. At this point, I have no idea why. My best run last night was the first one, with a 1.9 second 60', which felt strong, followed by a 14.1 second 1/4 mile at 98mph. WHAT THE ****. I didn't blow anything up, didn't overheat, don't hear any tell-tale noises from my block, and the car in general still accelerates and drives normally. Hell, it still feels as fast as it did when I ran 13.3@105, it just isn't. I made three runs, 14.1@98, then 14.2@96, then 14.4@96. As I said, there are no tell tale signs. The car is running smoothly, not burning oil or coolant, not making any goofy noises, ect. According to the MustangWorks calculator, I'm down 50hp. Here are the changes made to the car between last time at the track (13.3@105 and this time 14.1@9 : 160* Thermostat installed New lightweight Summit seats installed, old seats yanked Sound deadening and carpeting removed from interior That's it...nothing I can see that would take away 50hp. I tested my nitrous system this morning and it's spraying as it should. There is a slight leak where the injection nozzle meets the intake tube, but I don't think it's a 50hp leak. Also, my coolant temperature sensor is ****ed and the cooling fan isn't working as it should, but, the car is NOT overheating and didn't overheat at the track. It ran cool as normal. Again, I don't think that this would take away 50 horsepower even if it were a factor (which it's not). This weekend I'll check it over good, starting with the plugs, then the distributor, then the fuel pressure...at this point, I'm thinking one or two cylinders are not getting either fuel or spark. Wish me luck. Any suggestions are welcome and appeciated. |
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#2 |
I'd rather be basketweaving
Join Date: Feb 2000
Location: Indianapolis
Posts: 2,551
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![]() Were you using the nitrous then? If so, there could be a number of issues (low bottle temp, fuel and/or nitrous line or solenoid leak...)
Where is your nozzel mounted? It sounds like you could me letting in unmetered air through that leak. This means it will run leaner than normal, which can be bad, especially when using nitrous. Get rid of that 160 thermostat, there is absolutely no need for it. Put a 180 in it. How did you 60ft's compare to the previous runs? Let us know how the plugs look, but I'd say they're going to be fine if you say it feels like it is running fine. If 1 or 2 cylinders were not firing, or were even slightly missing, you would know it. I've been there numerous times. It would help to know a little more about the car. What year/tranny/engine combo, etc. good luck
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NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft |
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#3 | ||||
Registered Member
Join Date: Jul 2004
Posts: 18
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![]() Thanks for the feedback.
It's a 95 Mustang GT with an AODE. Stock motor with a Zex kit, 4.10s, drag radials, 190lph fuel pump, Aeromotive regulator, and other bolt-ons. As I said earlier, it went 13.343 a little over a month ago. Quote:
I don't believe this is a nitrous problem. Quote:
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#4 |
I'd rather be basketweaving
Join Date: Feb 2000
Location: Indianapolis
Posts: 2,551
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![]() If your engine isn't up to operating temperature, your factory computer will run in "warm up" mode, which is going to run it rich. Now, I don't believe that is all of your problem, but it could be a little bit, especially because that's pretty much all you changed.
The nitrous kit seems suspect to me, even though you don't think so. You could have a plugged up line, or some other problem there. I'm not terribly familar with the Zex dry kit. How does it increase pressure? Does it just spike the fuel pressure regulator like the NOS dry kit does? Have you noticed any difference in the naturally aspirated feel of the car? I'm not an expert with the SN95's, but I do know that those computers are very picky. If it were me, I'd put a 180 or 190 stat in there and see what happens.
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NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft |
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#5 | ||||
Registered Member
Join Date: Jul 2004
Posts: 18
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![]() Quote:
The nitrous sprayed hard and fast for a good five seconds before I let off. If it's truly a nitrous problem, perhaps the nitrous I have is not pure enough....? Quote:
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Thanks for the help. I'll be getting into it tommorow and I'll keep you posted. |
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#6 | |
Registered Member
Join Date: Jun 2002
Location: manassas, va
Posts: 186
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![]() Quote:
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1983 mustang, 393 cubic inch stroker small block, victor jr heads and intake, gold race 1.6 roller rockers. comp cam 304, 244@ .050. .576" hydralic retro roller cam,lunati rods. block was o-ringed,10:1 forged pistons, speed pro fit fit rings, clevite bearings,msd distributor and igniton,be cool huge radiator, black lite electric fan, march underdrive pulleys, mildon deep sump oil pan, mac 1 3.4" long tube headers, 3" dr gas x-pipe and mac exhaust,ARP bolts. car weighs 2900 lbs w/out driver, sub frames, weld wheels, mickey thompson sportsman pro 26 x 10.5 x 15's,#8 fuel line steel braided |
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