1 Attachment(s)
we all need to get bigger turbos.
Maybe all the rods look like this, giving a nice low compression? https://www.miataturbo.net/attachmen...ine=1386623671 |
Originally Posted by TurboTim
(Post 1081136)
we all need to get bigger turbos.
Maybe all the rods look like this, giving a nice low compression? https://www.miataturbo.net/attachmen...ine=1386623671 |
Originally Posted by thenuge26
(Post 1081135)
If only your valve springs were stronger than 21lbs you would have been OK :giggle:
Doesn't matter, still made more power than my limpdick BP. Also: I'm pretty sure my current seat pressure is like..... 110lbs. NECESSARY. :rofl: |
Originally Posted by Leafy
(Post 1081137)
Come on tim, you know that rod length does effect compression.
Come on, all the cool kids run bent rods. You really think Lars wanted those rods for a damn lamp post?! Displacement stays the same. |
Little update on the car...
First it is still alive with still perfect compression across all cylinders went to the strip last friday and did around 6-7 passes and managed to do a best of 12,70 @ 111.1mph witch I consider pretty decent considering we had totally worn out tires that are probably more than 5 years old and a totally full tank of gas.... I also realized how the 6 speed is geared like crap for a quarter mile lol. It is as bad as it is fun like hell on the street.... first gear is so short and shifting 5 gears in a quarter mile is a little too much shifting for my taste.:p |
sounds like you need to get in on the 3.3 fd group buy
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Naaa, run a 4.3 and start off in 2nd gear :)
For myself eventually I want a 3.63 with a 6 speed. The 3.3 seems a little extreme for now. If I build the engine and start making huge power perhaps i will think differently. Keith |
can't go 4.3 id had to shift 6th at the end of the run.
My father is thinking about ms3x rods and valve springs for next year so ill probably just bump the limiter to 8.5k so he'll stay in 4th up to roughly 115mph... |
Based on 1/4 mile times I would say 300hp is about right. Great job. Love to see more videos. If you could do a 0-100 pull that shows your rpms that would be awsome. Im working on a budget turbo build and have a 6 speed and a gt2876r I may use. im Always afraid of going over 250wtq due to stock rods your dyno shows you right at it and 300whp so I hope your motor last a long time.
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Originally Posted by karlou426hemi
(Post 1127193)
can't go 4.3 id had to shift 6th at the end of the run.
My father is thinking about ms3x rods and valve springs for next year so ill probably just bump the limiter to 8.5k so he'll stay in 4th up to roughly 115mph... Keith |
What size injectors and fuel system? stock pump? returnless?
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stock fuel system exept 550cc injectors,
Can't go any higher than stock limiter because i am still on the stock ecu so ill live with the gearing i have now. :) |
What brand 550 injectors? I hope to see more people get away with stock 300hp engines and like to see them last for years. Cool to see the old turbo working great.
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Originally Posted by locomonkeyboricua
(Post 1127442)
I hope to see more people get away with stock 300hp engines and like to see them last for years.
My only concern is I may run out of injector running E85 and the RX8 injectors at that power level. If I start getting ridiculous duty cycles I will need to back off until I get new injectors. I can't wait! My turbo system is almost finished, COP has been shipped, my repaired MS3 has been shipped, clutch and flywheel are ready to go in, and Xida clubsports should ship this month! Keith |
Good idea. I was thinking of managing tq by ignition timing map. Around 3-4.5 k keep timing down to lower the tq output and then tune it from 4.5 -7.5 for max power. So after I shift I should stay in the upper power band. The boost method works great as well.
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Does anyone else in here think that the 6speed helps keep stock engines with over 250whp running due to the shorter gearing keeping the rpms up there for putting less stress on rods??? Just a thought.
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Originally Posted by locomonkeyboricua
(Post 1127814)
Does anyone else in here think that the 6speed helps keep stock engines with over 250whp running due to the shorter gearing keeping the rpms up there for putting less stress on rods??? Just a thought.
Keith |
Originally Posted by locomonkeyboricua
(Post 1127814)
Does anyone else in here think that the 6speed helps keep stock engines with over 250whp running due to the shorter gearing keeping the rpms up there for putting less stress on rods??? Just a thought.
Originally Posted by Twodoor
(Post 1127834)
I don't think so, I will check on my excel spread sheet of Miata gear ratio's when I get home. Using that I can easily see what RPM you drop to when shifting at 7000 RPM in each gear on both transmissions. I am at work right now so I can't access it.
Keith Gear change . . . . . . . . .5 speed. . . . . . . . . . . . . . . . . .6 speed 1 to 2 . . . . . . . . . . drops to 4100 RPM . . . . . . . . . drops to 4200 RPM 2 to 3 . . . . . . . . . . drops to 4800 RPM . . . . . . . . . drops to 5100 RPM 3 to 4 . . . . . . . . . . drops to 5300 RPM . . . . . . . . . drops to 5350 RPM 4 to 5 . . . . . . . . . . drops to 5700 RPM . . . . . . . . . drops to 5550 RPM 5 to 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . drops to 5900 RPM So, the only significant difference is on the 2 to 3 shift the 5 speed drops 300 RPM more than the 6 speed. Not enough of a difference to make the pistons or rods last longer at higher torque values. Keith |
Well so much for that thinking. I swear when I was watching youtube of the 6speed with I think 4.10 it would not drop much seem to always be above 5k. But maybe I was wrong. Why do people say the 6 speed gearing is so short if only 300 rpm or so shorter.
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Originally Posted by locomonkeyboricua
(Post 1127923)
Well so much for that thinking. I swear when I was watching youtube of the 6speed with I think 4.10 it would not drop much seem to always be above 5k. But maybe I was wrong. Why do people say the 6 speed gearing is so short if only 300 rpm or so shorter.
Keith |
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