You got me worrying how much my stock 99 auto is going to hold. Will found out soon enough.
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No offense, but I can't think of a worse gear ratio than a 3.63 for dragstrip use with your power level. I understand the desire to have a comfortable street car, but you are leaving an awful lot on the table.
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Originally Posted by miata2fast
(Post 1367980)
No offense, but I can't think of a worse gear ratio than a 3.63 for dragstrip use with your power level. I understand the desire to have a comfortable street car, but you are leaving an awful lot on the table.
and if you look at the ratio's of the jatco i needed more legs https://cimg7.ibsrv.net/gimg/www.mia...ec00aa0937.jpg i could be wrong i bought the 3.63's when it was manual i may go back to 3.9's depending on how it goes on the track i just spoke to my auto builder asking about the thing revving to 6,800 rpm he said some cars do it they build your converter to the cars specs there are two ways to check mph on the track and Dyno and check rpm vs wheel speed |
How tall of a tire?
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225/50/15 is the tyre and so far feels like it sticks well
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Ok so everything works a treat hits limiter in third at 132mph so gearing seems perfect it comes on hard on the dyno with the converter
the intresting things we tried 2 more psi got some blowout but the dyno line jumped up a silly amount so i might have to regap plugs or upgrade the ls coils thats at 27.1psi i want 28psi in the end the fuels are pretty good there is one dip we want to clean up we also might throw some more timing in it see what happens i want 300rwkw back |
343whp/460wtq for those curious.
Day-um! Am I reading that right, 625 Nm of torque? Did you figure out if the converter is slipping? |
We dont think it is slipping
torque is a little higher as we were doing 2nd gear runs but my friend who owns the dyno said it wouldnt be much less |
If tq is high then so is hp. One is a mathematic function of the other.
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Originally Posted by sixshooter
(Post 1368355)
If tq is high then so is hp. One is a mathematic function of the other.
next thing is the run it down the quater i may just turn it up before i go |
Originally Posted by patsmx5
(Post 1368223)
343whp/460wtq for those curious.
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Could be. Old style autos can result in some weird dyno readings. My buddy in the old turbo dodge minivan would usually have a graph that was shaped a lot like that, with somewhat similar numbers.
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I guess we'll find out when it runs the 1/4 mile.
I never quite understand your time slips down there, there always seems to be a 1264 foot mark or something. |
well it feels quick i am keen to run it down the track but not sure when i can go cause the closest track is two hours away and i work the weekends
it at least feels very quick and its fun to drive i might go out and bench mark it with some friends with a few v8's and see how it goes |
Originally Posted by 18psi
(Post 1368462)
this does not sound correct
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UPDATE !!
Box has to come out
My auto builder called me as we had a discussion earlier in the day and there is an issue not a big one but its costing me power and not coming on properly oil pump in the box might need modding or changing he will also change the converter slightly he thinks converter is flaring due to lack of oil pressure but is an easy fix then we can turn it all up |
https://cimg5.ibsrv.net/gimg/www.mia...f1dd85d30e.jpg
https://cimg7.ibsrv.net/gimg/www.mia...9edd099e31.jpg its up and exhaust is out i need to have it all apart by Tuesday and they will have box all moded within one week not how i planned on spending my weekend |
Originally Posted by mx5psi
(Post 1368503)
Box has to come out
My auto builder called me as we had a discussion earlier in the day and there is an issue not a big one but its costing me power and not coming on properly oil pump in the box might need modding or changing he will also change the converter slightly he thinks converter is flaring due to lack of oil pressure but is an easy fix then we can turn it all up |
Originally Posted by patsmx5
(Post 1368650)
What do they think is wrong? What changes are they thinking of making to the oil pump?
he thinks he left the stock MX5 oil pump in the box he will upgrade it to the Holden VL Turbo model which is the car they build these boxes for or modify the stock one which iam not sure of what entails he is also going to tweak the converter as he has said it may be a little loose |
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