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peter mc

Owens 3.2 build ,starting over

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This is looking great. Love the hole setup. Can't wait to see the Dyno results. And Peter did less make those headers or are they SWM headers.

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We can make your pipes the same Gordo , but its easier to start with a new set , the new pipe has a shorter primary pipe  buy 150mm and fatter second pipe that is shorter as well , when we did Jake's we made 3 sets of pipes and tryed new lengths and size and  these pipes are what we cam out with .

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So much candy! The big headers look shexy. Are the tig welded?

 

Ooooooh, What's the advantage of this box over a stock 5spd. Are they easy to come across?

 

This is going to be such a sweet ride Owen  8)

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Gareth the gears set is from kameari , its a 1st 2nd 3rd set and we have fitted a 5 gear so he can cruze with the 4.3 diff ,

for one there a much stronger gear set , and when you fit the big cams you dont want a gappy gear set like most jap boxes 2nd to 3rd is just to wide , and the motor falls off the cam and thats not cool ....  ;D 

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Sweet! at least ill have something that can take my bad driving  ;D  looks great pete  8) ill have the car dropped off this Saturday thought I'd get a set of cohoonies and just do it in stead of getting les to come pick the car up! Lol

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Mind sharing the ratios there? I just built a box in my floor, that had gear ratios I couldn't find in any Nissan box...Not sure if I scored a rare core or something. Nothing in Nissan USA got the below ratios, nor can I find a listing for any box with the gear widths in this one...2, 3, 4 are all 22mm wide, 1st gear is 24mm wide, input gear set is 22mm wide. 5th gear is still 18mm wide, with a high tooth-count pair...still the 240SX 0.754 ratio but with a third more teeth. Uses a 1997 Pathfinder 4WD synchro kit, but a 2WD bearing kit and case. The 2WD synchros would fit, but didn't allow the gearset to fit into the case...too long.

 

The ratios in my box are 3.321, 1.915, 1.517, 1:1, 0.754

 

The third gear...should be 1.308 to make it match with the gearset I was expecting. Second gear should have been 2.088, too...but I checked more times than I care to recall the tooth counts and kept getting the same numbers.

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FJ20 Kameari gearset - info is on their web site but....ratios are

 

2.427, 1677, 1258, 1.00 whatever 5th is normally 0.838 for FJ20ET box or could be 0.752~0.863 for the FJ20 box.

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yer Xnke i spent some time looking for your gear ratios and only 1 make sense , the first gear is a normal Nissan ratio but the 2 3rd gears don't work at all ,

 

with Owens he is using a 4.3 diff and i have fitted a .75 5Th gear so it will be at 3000 at 110 ,

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Bit off topic, but if these gear ratios work so well for a 4.3 are they going to be ok with the 4.11? Or am i going to be really missing out?

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YER Jake the only ratio that needs to be diffrent is 5 gear,  the rest are nice and close and that's what you want with the torque at 5500  , Owens engine will make max torque at 4900 to 5200 , so it will run a .75 5 th and still drive nice

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OK but mine has the .75 5th in it being an RB20 box right? So in theory the exact same ratios and a 0.75 5th.

 

 

I just looked at the transmission calc Les sent me and it says 2900rpm @ 110kph for 4.11 with a 0.75 5th with 245/45/16s = Top speed of 282.284kph

 

 

With a 0.83 5th it's still only doing about 3200rpm @ 110kph with a top speed of 255kph. That would be better for the track surely and who really wants to be able to do 280kph in a 240Z?

 

 

Looks like there is only about 4-6kph in each gear going from a 4.11 to a 4.3. Is that noticeable?

 

 

This is making the torque lower because of the street cam too right?

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The 5 th gear in this type off setup is only for the road so you can cruze at 3000 , the rest is for track work ,

and yes this motor has 12 deg less on the cam so it makes torque lower in the range ,

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well its still on the dyno , Les and i had a hard time with the tune its at 300hp at 7000 but we are still tuning and making different pipes , and adjusting the cam , maybe changing the cam , also the injectors are maxed out now ,... its been a hard slog but tomorrow will see more tuning and i will get back to you with a video  :)

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No its right on the limit mate , but its OK . It made 310 hp and 265 ft lb  made power all the way to 7300 with the small cam and small pipes , it was a tuff dyno session 2 days and we tryed every trick to make it work

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That's still dam good pete I'm happy with those results  ;D 

Did you end up changing the cam? And pipes?

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MATE did we change cams lol 3 times , and pipes we tryed 3 combos with all cam  combos , we tryed so hard to get the torque up ,  in the end it got the 1308 cam , 590Lift 300deg and the SW race pipes , the big pipes lost a bit down low around 15ftlb , they were better after 5000rpm all the way to 7500  but as a road car the small pipes had to go on , also the big cam just did not work in your EFI combo.

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So,can anyone tell me if there is another engine builder in Aus that works this hard to get the best results?

Over the many years I have been racing and the countless engine rebuilds I have had. They all just pass you the engine over the counter and say , there you go. Good luck with it. Hoping that the exhaust and fuel system are a good match. At least PMC engines walk out the door a tried and tested thing. Another happy costumer. Good job Peter.

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