First 914 build... V8 twin turbo SBC, 1974 v8tt conversion project Options

[Mike Bellis]

The 283 is a good platform. You will have around 250hp (mine did) without the turbos. Your 400hp mark is easy to reach. The motor looks like it sits too far back in the chassis. Most V8 conversions sit 1.5" back. This can be measured from the rear tranny mounts. You end up with around 1/2" clearance at the valve cover/firewall. Moving the engine more forward will help with chassis balance. Then you can flip flop the exhaust manifolds to get the turbos away from the rear window.

Looks like a fun build. I love engine swaps... (IMG:style_emoticons/default/wub.gif)

[beam944]

The 283 would have to be rebuilt, and I would love to build it but for time constraints I have a 350 already built ready to go... Yes the engine is to far back and needs to be moved forward...the guy I purchased it from had it in just for mock up...and from the angle of the axles it is about 3 inches too far back...it is also way high

[Dave_Darling]

It'll be fun, but you will get an education in the weak spots in the drive train. One piece at a time. You'll break something, replace it with a stronger part, and then the next weakest thing will break.

The times it runs will be scary fun, though!

--DD

[beam944]

I can't wait...fortunately I have a small background in chassis building...well I have the help of ppl that do it for a living, so there will definitely be parts made and technology incorporated into this build from NASCAR... I am foaming at the mouth to get started!

[Andyrew]

My suggestion if you want to try and keep the 901 trani.. Go with a SUPER big turbo/twin turbos.


This way you can keep the boost very low, and have the boost start to build pretty late (for a v8) like say 3k. This will keep the torque down and will help you not destroy your 901, not to mention keep the turbo's/oil nice and cool. You will have boost lag, but the feeling of it spooling and building boost will just be so much more fun.

[beam944]

I agree!! kind of like power band on a 2 stroke..

[beam944]

(IMG:http://www.914world.com/bbs2/uploads_offsite/i328.photobucket.com-17254-1397700025.1.jpg)
stainless goodies...

[Andyrew]

Better off going with a large rear mount turbo. Put the heat away from the engine bay.

[RJMII]

Maybe a gt 28r on each bank, or a td05 16g? That would keep your exhaust to intake pressure ratio pretty close to 1:1 and the power band up a little higher after a good spool up, and you wouldn't need a special turbo cam.

[Andyrew]

A pair of gt28's on 4.6L? First off I dont think he should go ball bearing turbo. The whole goal here isnt to make crazy power at low rpm, its to have a turbocharged sbc 914 in some package that wont destroy everything the first time he gets on boost...

I think a larger journal bearing single turbo would make good power, give him some spool time, and be much cheaper.

Heres an interesting article.
http://www.hotrod.com/techarticles/engine/...98/viewall.html

[bulitt]

Put the 350 into it and get it running. This is a 2300lb car and with 350hp you will have the power to weight ratio of a dodge Viper. Then if you still have a hankering for turbos have at it. But, this is the land of Nascar. People put speed equipment out in the recycling bins. (IMG:style_emoticons/default/biggrin.gif)

[3d914]

Nah, 350hp is child's play. Go for the twin-turbo V8, 500hp, 400ft. lbs for 200mph +. (Of course you can't do that easily with the 901 tranny)

That'll wake up some of the big boys!

[beam944]

I am taking all of the suggestions in....I also like the designing aspect of this as well..here are some theoretical numbers I came up with let me know what you think(IMG:http://www.914world.com/bbs2/uploads_offsite/i328.photobucket.com-17254-1397966474.1.jpg)
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[drive-ability]

That car's going to be a handfull. Buckle up and hang on ! (IMG:style_emoticons/default/biggrin.gif) Did I see a radiator or intercooler in the back ? I'm sure it would work fine, when ya turbo the space gets taken up quick and the temps go up as well. Turbo engines are so fantastic when their setup right, but they scare me in a fun way.

[Andyrew]

I am taking all of the suggestions in....I also like the designing aspect of this as well..here are some theoretical numbers I came up with let me know what you think(IMG:http://www.914world.com/bbs2/uploads_offsite/i328.photobucket.com-17254-1397966474.1.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i328.photobucket.com-17254-1397966474.2.jpg)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i328.photobucket.com-17254-1397966474.3.jpg)

Maybe at 7lbs of boost with little tuning.... That calculator seriously underestimates what a turbo can do... My 1.8L Audi engine makes that much power with a turbo much smaller than were talking... Seriously...


You put a nice big turbo on it and you'll make whatever the bottom end can hold... Its all about moving the power curve where you want it... Thats where sizing will come in. 350lbs tq at 2krpm is really plenty on the street, Where you actually will want that turbo is to start spooling ~3500 and then build the engine to allow you to rev to 7-8k (You've got nascar stuff... right?) so that you can rev it out and make some power (if you want...)...

Traction will be the real issue when your getting to that much power... Much above 400hp its starts getting to be a real problem keeping the car straight. I've ridden in a 550hp v8 914 with maaaasive hoosier slicks, We stayed sideways till 100....

[bulitt]

Don't mess around with the SBC. Put a twin turbo Viper V10 in there. 1200hp The extra weight will help with your traction issues.

Underground Racing

[beam944]

Does anyone know if there has been traction control incorporated into a 914 conversion? (IMG:style_emoticons/default/smile.gif)

[Mike Bellis]

Does anyone know if there has been traction control incorporated into a 914 conversion? (IMG:style_emoticons/default/smile.gif)

It was an option for me when I did my conversion. I opted not to incorporate since it was designed around a 3500lb car. When it came down to it. I only grafted in the steering column and dash cluster.

Bosch makes a universal version you can add and program. It only costs several thousand dollars. Many race teams use the system.

[beam944]

Of course I will have to drive it without it and see if it would be worthy of the cost to do...reason for such low numbers on the engine design as well...definitely more horses stored in that little 283 but I also want reliability... not saying we have used TC in racing...cough , cough....but there is some laying around that could be tried out...I'm a ways from that point but hope to be starting on this project end of week.

[Andyrew]

Does anyone know if there has been traction control incorporated into a 914 conversion? (IMG:style_emoticons/default/smile.gif)

You probably have much better access to traction control systems than the rest of us. Without using something designed for a specific engine/ecu its really difficult to design a system...

Traction control would be nice....