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turbo blowthrough dual webers/sdsefi


Guest Anonymous

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Guest Anonymous

I have and interesting setup for all you folks interested in sds. I have an f54 block, p90 heads, stock internals, and a handbuilt exhaust header done by Ross Farnham (originator of sds)feeding into a Garrett t3-t4 hybrid turbo with t04-t5 compressor. This setup blows through two downdraft Webers. No intercooler. Stock 280Z distributor. Ross did this conversion for me about 8 years ago before he started sds. The combo probably puts out about 300 horses and has done for 8 years. My problem is that the system is not very tunable and I have no current way of retarding spark under boost. I get occasional detonation around 10 psi. I've looked at the cost of rebuilding my engine the right way (forged pistons, floating small end, etc etc) plus adding sds, intercooler but the cost adds up to about $10,000 Candian pretty quickly. My questions: 1) I've all but decided to go with V8 conversion on a bang for the buck rationale. Comments? 2) Anybody have any bright ideas how I could make my current setup more tunable and safer i.e. stick with the blow through downdraft Webers. 3) I get a lot of heat buildup and I don't know if it is my mixture/timing choices or if it is the nature of the beast - comments? Thanks for the input, folks.

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Guest Anonymous

I'd just get the 6f sds system, some injectors, and a FI intake manifold and slap it on and grab a stock 280 turbo intake pipe.

That'll be well under $2000us($4k or so canuk $) and give you complete adjustibility. Add an intercooler and you'll get tons of power.

You can get nice 420cc injectors that JWT uses for 280zx and z31 turbo stuff from carparts.com for $220 if you find a $100 off coupon. They fit right in with the stock 280zx fuel rail and manifold. Works great.

 

 

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Morgan

http://z31.com/~morgan/s30

http://carfiche.com

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Yup, thats a great idea morgan. Talk to your good friend Ross and let him know what you are doing. He'll be able to set you up again I am sure.

 

 

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"Gimme Fuel,

Gimme Fire,

Gimme that which I desire"

-Metallica

 

Drax240z

1972 240z - L28TURBO transplant on the way!

http://members.xoom.com/r_lewis/datsun.html

http://members.home.net/drax77/newpage.html

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Guest Anonymous

Thanks for the input, guys...Who makes a good boost retard box I could add to my current ignition...or are you talking about a manual retard you would adjust from the cockpit for "spirited driving"? Possibly some spark control plus and intercooler and some careful tuning of my carbs would be all I need - after all it's lived flawlessly for many years.

If I did go with SDS and a stock intake manifold, I'd have to change my exhaust header as it is handbuilt for my application and won't fit a stock efi manifold...any suggestions on which intake and exhaust manifold setup is best? Also, is the Toyota supra intercooler adequate? What are you people using - Spearco stuff primarily?

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Guest Anonymous

Also, since it's a blow through setup, you could easily add an intercooler!

But it'd probably take lots of re-tuning to get the carbs to work well with the cooler, denser air.

Very cheap though if you are good with the carbs, and it should solve your pinging problem. Also give lots more power if tuned properly.

 

 

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Morgan

http://z31.com/~morgan/s30

http://carfiche.com

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Dr G,

 

I would imagine the simplest solution, if you keep the existing setup, is a boost-controlled alcohol injection system after the carb but in a location to ensure even distribution. On the ignition side, you need to ability to dial in retard based on manifold pressure. I would recommend MSD and it could be as simple as a $200 box strictly for sensing boost and retading the ignition or a complete MSD ignition setup.

 

Having gone the L28T with EFI, SDS and I/C route, I highly recommend it. It just flat works! As for the existing header, here is a suggestion. If it is a really good one with a good DP, I would have a machine shop CNC machine a flange to fit with the stock intake and have it welded on the headers. Might cost you $200-250, but if you go to a stock exhaust manifold, you will have to redo the DP and exhaust connection at the same cost. Of course if you go the stock route and use the stock wastegate, you can use one of my DPs biggrin.gif

 

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Scottie

71 240GN-Z

http://www.mindspring.com/~vscott911/gnz.html

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