J30a Honda repower

[Kakapo76]

if you keep it n/a can you run the factory ecu? is that hard to do?

[Jeff B]

if you keep it n/a can you run the factory ecu? is that hard to do?

I'm not sure? I'm not smart enough to do that.
I know the older J30/35 can be run on the factory ECU. You can buy a modified loom/ECU out of USA, they use them in off roaders.
I'll keep this one N/A and use an aftermarket ECU

[Kakapo76]

what pump will you run... 2 stage? or your new modded 2 stage jetski pump?

[Spargs]

I’m curious too about the pump you plan to use. Not knowing a lot about these engines other than what I can see online they look to develop their torque and hp at higher revs, 5k and upwards where if I understand correctly, a traditional  jet unit is losing efficiency. I’m just curious.

[Jeff B]

I think it will have enough torque to spin a 7.5" 2 stage to about 5500rpm? Will see.
I think maybe a better option than a VQ35?
Not much else options for a "mid size" engine?
Will have too much low down torque and not enough revs for my 158mm 2 stage, thats going on the K24

[mohawk]

Better by 2 cams and 5kg of exhaust , but otherwise physics would point towards it being exactly the same ... The datsun might be abit stronger and gruntyer , but id guess only enuf too overcome the wee bit of extra weight .
Should make a nice 12 footer on the 750 pump.

[Jeff B]

Actually, now that I remember it....the engine I have is the j35z6, which does not have VCM, it has v-tec on the inlet cams(not VCT) and higher compression ratio than the NZ market J35z2 which has lower compression, VCM, (not v-tec) and lower power.
So not really suited to turbo.

[Jeff B]

Looking at the 752/772/kodiak/Flo pro. They are too high in the intake. Will end up with 60mm clearance under sump. Better to get the weight lower. Might have to use the trusty old Colorado (modified) intake and mount on about 3 degree angle.

[johnmead]

Hey Jeff, just mount the engine lower and have the drive shaft angle down instead of up. To get enough clearance in The Old Boat, I have 10, possibly 10 and half degrees on the universals and it works fine 

[Paul]

Hey Jeff, just mount the engine lower and have the drive shaft angle down instead of up. To get enough clearance in The Old Boat, I have 10, possibly 10 and half degrees on the universals and it works fine 

Yes, you just want the jet-bearing and flywheel totally parallel - the offset in the jet mainshaft and crankshaft can be in any direction.

[mohawk]

Not if he runs a donut

[mohawk]

With the motor that close you will only be able too drop it a wee bit anyway.......id move it forward , in a 12footer you may not want that much weight in the back anyway...

[Jeff B]

Yes, you just want the jet-bearing and flywheel totally parallel - the offset in the jet mainshaft and crankshaft can be in any direction.

Nope.
I could mount the driveshaft "broke back" position. I could mount engine dead level with hull, driveshaft centre on a 2.5 deg angle. End yokes on 2.5 deg angle.
Still wouldn't get it much lower..

[Jeff B]

Na the weight distribution is good with the engine there and fuel tanks each side front of engine.
I would rather shorten driveline by 100mm than poke the unit out the back another 100mm.

[Jeff B]

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