Drivetrain thoughts, northstar-915 / or 4.3 GM boxster 6 speed |
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Drivetrain thoughts, northstar-915 / or 4.3 GM boxster 6 speed |
got914? |
Apr 3 2015, 02:29 PM
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#1
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Member Group: Members Posts: 133 Joined: 8-October 14 From: Niagara Member No.: 17,993 Region Association: None |
Ok ive narrowed by drivetrain options to a
northstar with a 915 or a GM 4.3 v6 with a boxster 6 speed Ive seen the 4.3 done before but never a northstar. Mind you the 915 trans is getting hard to find , or at least thats the way it seams... |
Mike Bellis |
Apr 3 2015, 04:54 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
I wouldn't do either one... But if I have to choose from your list, go with the Northstar for the cool factor.
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Bruce Hinds |
Apr 3 2015, 10:18 PM
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#3
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V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
Interesting choices . . .
4.3 - why bother, it's as much work as a V8' 915 - I don't believe it has any advantages over the 901 and it's a bunch of work to convert. |
914nola |
Apr 3 2015, 10:25 PM
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#4
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Member Group: Members Posts: 114 Joined: 10-August 14 From: New Orleans Member No.: 17,759 Region Association: None |
Has anyone put in a boxster 6 speed successfully.
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Mike Bellis |
Apr 3 2015, 10:29 PM
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#5
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
Has anyone put in a boxster 6 speed successfully. I have. It bolts right to my Audi motor... (IMG:style_emoticons/default/biggrin.gif) |
Bruce Hinds |
Apr 3 2015, 10:48 PM
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#6
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V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
Will the boxster bolt to the audi v8?
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mgp4591 |
Apr 3 2015, 10:53 PM
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#7
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914 Guru Group: Members Posts: 5,384 Joined: 1-August 12 From: Salt Lake City Ut Member No.: 14,748 Region Association: Intermountain Region |
A couple of folks have done the Boxster 6 spd in with an LS1- ask around. Also see if Kennedy makes an adapter for your Northstar. Being a GM, it may be already done thinking it's all in the family.
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Mike Bellis |
Apr 3 2015, 11:02 PM
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#8
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
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colingreene |
Apr 4 2015, 12:35 AM
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#9
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Senior Member Group: Members Posts: 729 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
Why would you want a 4.3 they are nasty motors. Low reving crap power output and they sound like a asthmatic with emphysema
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got914? |
Apr 4 2015, 07:31 AM
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#10
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Member Group: Members Posts: 133 Joined: 8-October 14 From: Niagara Member No.: 17,993 Region Association: None |
why 4.3 ?
Cuz I have one sitting on my garage floor. And 300 HP from a 4.3 is easy as pie. I do see the Northstar being much cooler with DOHC heads. Under everything ive read the 915 can handle much more than the 914 transmission |
Mike Bellis |
Apr 4 2015, 08:53 AM
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#11
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None |
If the 901 is treated well, it will handle power. 1st gear is weak. I ran a 500hp turbo rotary on a 901 without issue. I always made sure not to stab the gas pedal until I was in third gear.
The Boxster tranny ($3500) is the same transmission as the Audi/VW 012 tranny ($400). They are all made by Audi. The Boxster S tranny ($1000-$5000) is built by Getrag. This tranny is also available in FWD Audis for less money. The difference is the Boxster comes with linkage compatible with cable shifters. Make sure you consider your chassis if you are putting 300hp in a 914. You will need suspension, wheels, tires, brakes, stiffening kit or roll bar, etc... This gets expensive. There is also the respect factor. An American engine is fun but you will get sneers from most Porsche owners. 914 owners (NARP) are a little more forgiving. A Japanese engine (like a rotary) will almost get you laughed at. I can say with my Audi motor most PCA members seem to like it. With that said, the 914 chassis is a great platform for an engine conversion. I don't really give a fuch what people say so ridicule don't bother me. I'm not sure how an engine choice can effect resale value. Like me, you will only be able to sell to another conversion owner or a newbie. Most 914 owners particularly like Porsche motors even if it's a conversion 6 cylinder. Buying a complete V8 conversion will most likely be cheaper than building one. I bought mine for $7k (5 years ago) but that included: roll cage, stiffening kit, 930 brakes, suspension, sway bars, V8, etc. Since I bought it, I swapped in 3 or 4 different engine tyoes before settling on my Audi turbo motor. I absolutely love the Audi motor. I'm making about 325hp. |
DBCooper |
Apr 4 2015, 09:24 AM
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#12
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
An American engine is fun but you will get sneers from most Porsche owners. 914 owners (NARP) are a little more forgiving. A Japanese engine (like a rotary) will almost get you laughed at. True, and I actually like this part, when people kind of self-identify themselves. |
Bruce Hinds |
Apr 4 2015, 10:06 AM
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#13
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V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
An American engine is fun but you will get sneers from most Porsche owners. 914 owners (NARP) are a little more forgiving. A Japanese engine (like a rotary) will almost get you laughed at. True, and I actually like this part, when people kind of self-identify themselves. Me too! It's really all about the driving and making it fun. Value and pretty show cars are really nice, but if you can't drive it in the rain or snow why bother. Wait! I have to clarify here - the snow thing - I was in Colorado where they don't use salt! Opps, I digress, back to the sneer thing - When I built mine too many years ago it was really a new thing and where I lived, PCA would have nothing to do with us, so any activities were strictly SCCA - they were fun! The best experience, in this regard, was when I first put it together, it still had fairly narrow wheels and tires, a true sleeper. I'd pulled off the highway and a brand new 944 turbo pulled up along side. We were both going to turn left in both lanes, he rolls down his window and tells me my VW really sounds funny! We stayed together through his first gear and as he shifted to second, since I was already there I just put my foot down. I often wondered if he took it back to the dealer and complained. |
Chris914n6 |
Apr 4 2015, 12:13 PM
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#14
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Jackstands are my life. Group: Members Posts: 3,341 Joined: 14-March 03 From: Las Vegas, NV Member No.: 431 Region Association: Southwest Region |
Well...
The Northstar don't fit so good because of the large dohc heads. The 915 box isn't worth the expense to flip it. If this is your first conversion then the 4.3 to the 914 box might be a good way to cut your teeth. Plus you will be up and running sooner. You will throw a bunch of money at the Box6 for 2 extra gears and smoother shifting. |
veekry9 |
Apr 5 2015, 04:29 AM
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#15
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OldMember Group: Retired Members Posts: 3,068 Joined: 17-June 13 From: TO Member No.: 16,025 Region Association: Canada |
Some links for your perusal,a latemodel Caddy N* or castiron 3/4 350. A good source of bs-free info on the mid placement of a 4-cam. A few different installs with unique takes on mid power. http://www.fiero.nl/forum/Forum3/HTML/000007-77.html http://www.fiero.nl/forum/Forum3/HTML/000121-4.html http://en.wikipedia.org/wiki/General_Motor...C2%B0_V6_engine http://www.hotrod.com/how-to/engine/hrdp-0...v6-performance/ A simple install with a KEP bellhousing,more room up front,for turbos,etc.Heavy tho. P#=1700 Chevrolet 90° V6, 3.8 & 4.3 Liter. Shortened small block V8. Some Chev's use Buick engines so verify rear distributor (over flywheel). https://www.google.ca/#q=gm+4.3L+aluminum+heads What should be on top. (IMG:style_emoticons/default/biggrin.gif) The more sophisticated engine of course is the Caddy,for a reasonable cost.Mated to a 4k$ 6spd Boxster tx you would have a decent combo. P#8400 Cadillac Northstar & Aurora V8. DOHC 4.0 & 4.6. Computer contolled. Easily damaged if overheated. Either way it's a long process of building and customizing the 914 to a more powerful car with bigger brakes and a working cooling system that flows. Reinforcement has to be considered and suspension mods made to compensate for the weight changes and distribution,a rear sway bar no doubt mandatory with the castiron choice.Have fun. (IMG:style_emoticons/default/biggrin.gif) |
veekry9 |
Apr 5 2015, 04:08 PM
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#16
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OldMember Group: Retired Members Posts: 3,068 Joined: 17-June 13 From: TO Member No.: 16,025 Region Association: Canada |
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