hondabait Posted March 10, 2008 Author Share Posted March 10, 2008 Wouldn't the combination of a high spinning turbo and the quick shutting of the throttle on a draw through setup make a spike in vacum in the intake and a spike in pressure in the manifold. I thought it was these spikes in pressure that destroy turbo's. Wouldn't it still need a BOV or atleast BOV in reverse between the carb and turbo to limit vacum or maybe both? dumb question I know. Quote Link to comment Share on other sites More sharing options...
hondabait Posted March 10, 2008 Author Share Posted March 10, 2008 One more dumb thing. Is detination(ping) related to load? Hypethetically you have a motor with a disconeted ignition advance and your motor is on the edge of pinging. Will an increase in load cause it to ping? Quote Link to comment Share on other sites More sharing options...
Six_Shooter Posted March 10, 2008 Share Posted March 10, 2008 Wouldn't the combination of a high spinning turbo and the quick shutting of the throttle on a draw through setup make a spike in vacum in the intake and a spike in pressure in the manifold. I thought it was these spikes in pressure that destroy turbo's. Wouldn't it still need a BOV or atleast BOV in reverse between the carb and turbo to limit vacum or maybe both? dumb question I know. No, there is no build up of pressure to neccessitate a BOV. Like I said in my previous post the only reason for a BOV is to relieve the build up of pressure between the turbo and thottle plate(s). With the turbo after the throttle plates there is no way to stall the turbo by closing the throttle in a draw through set-up. In a draw through set-up, anything after the throttle plate(s) once closed is in vacuum. Once there is a lack of supply of air (closing the throttle), there is no way for the turbo to create positive pressure. Quote Link to comment Share on other sites More sharing options...
DatsunD Posted March 10, 2008 Share Posted March 10, 2008 71240 thanks for the pics! Quote Link to comment Share on other sites More sharing options...
Matadem Posted March 14, 2008 Share Posted March 14, 2008 Not a 4bbl but close and very nice Quote Link to comment Share on other sites More sharing options...
dhartig Posted March 15, 2008 Share Posted March 15, 2008 Here are the main components of Turbo Tom's system laid out. The bubble wrapped in the top right holds the meth/water tank that is injected into the intake manifold. I plan to look at progressive injection of the mix in my install. Below the meth/water tank is the intake plenum. It has a water heated section at the bottom to ensure fuel does not puddle on cold days. Choosing an appropriate fuel pump to feed the carb is also required. This kit does not have the "dial-a-boost" option. Hope this helps those thinking about draw thru options. Quote Link to comment Share on other sites More sharing options...
71240 Posted March 16, 2008 Share Posted March 16, 2008 I got by my storage unit today and took some pictures of my setup as it was removed from my car. 1 and 2) Complete setup as unbolted 3) Water lines from thermostat housing and then to the heater box. Also show vacuum line to brake booster. 4) Head view of manifolds. Also shows waste gate at lower left. 5) The water injection nozzle as it sits under the carb. I used a spray nozzle to mist the water into the fuel air mixture after a friend had a problem with his turbo being scored by a straight stream of water. I also used a 20% alcohol mix in my water. The waste gate uses a 7 pound spring and a dial type boost controller. With this setup I was able to run 10psi on the street and then turn it up to 15psi on the track. I've got a few more pictures if anyone is interest. Quote Link to comment Share on other sites More sharing options...
PresaMax Posted March 17, 2008 Share Posted March 17, 2008 Very nice. Thanks for the pics. Julius Quote Link to comment Share on other sites More sharing options...
Careless Posted March 17, 2008 Share Posted March 17, 2008 that is a cool bit of kit. I love how the turbo is like "HELLO, ENGINE". Quote Link to comment Share on other sites More sharing options...
hondabait Posted March 18, 2008 Author Share Posted March 18, 2008 so anyone willing to sell a setup? Quote Link to comment Share on other sites More sharing options...
the_CHAD Posted March 18, 2008 Share Posted March 18, 2008 Found this in my picture archive. (The picture is not mine and belongs to Dave Smith). I thought this might give you some ideas about adding a weber to your turbo engine. im very interested in this setup. so a single side draught is enough to handle a turbo'd 2.8? any ideas on how the carb was setup? plus, is water injection still necessary if boost is only goin to be under 8psi? thanks Quote Link to comment Share on other sites More sharing options...
71240 Posted March 18, 2008 Share Posted March 18, 2008 Yes, the carb is a standard Holley 750. We played with the jetting on the Dyno to get the mixture right. I honestly don't remember what jets we ended up with. The setup easily made 300+/- horsepower depending on boost level. The water injection is not typically necessary if you keep the boost to stock (7-8 psi) and use premium fuel. Anything over that definitely requires it to avoid detonation. Quote Link to comment Share on other sites More sharing options...
71240 Posted March 18, 2008 Share Posted March 18, 2008 I've honestly thought about it. I'm not sure if I should keep the setup as a cool piece of Z car history or sell it so it could be blasting down the road under someone else's hood. I've got a good bit of money in a new carb, rebuilding the turbo, coating all the manifolds and sourcing the proper water injection valve (one of the last ones Turbo Tom had). I only ran the setup for about 3-4K miles until I bought an EFI turbo setup from a buddy who is building an RB-26. Make me an offer? Quote Link to comment Share on other sites More sharing options...
PanzerAce Posted March 18, 2008 Share Posted March 18, 2008 it doesn't look like it would be all that difficult to replicate that setup... Quote Link to comment Share on other sites More sharing options...
71240 Posted March 19, 2008 Share Posted March 19, 2008 The kit contains three custom castings (intake and exhaust manifolds and the carb plenum). The intake/exhaust manifolds are relatively simple pieces. I suspect the carb plenum would be a different matter since it's dual walled to allow water to circulate around the air/fuel charge. Also keep in mind that the castings all require machining to ensure proper hole alignment and mating surfaces for the turbo and head attachment. If you had access to design software a casting foundry and a machine shop it could be done. Quote Link to comment Share on other sites More sharing options...
Guest 9385kevinl Posted March 21, 2008 Share Posted March 21, 2008 Theres an su carbed draw threw on ebay right now: http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&ssPageName=STRK:MEBTOX:IT&item=230234143948&_trksid=p3984.cTODAY.m238.lVI Any experience with this kit ? Quote Link to comment Share on other sites More sharing options...
supertip Posted March 23, 2008 Share Posted March 23, 2008 bidding now. Quote Link to comment Share on other sites More sharing options...
supertip Posted March 24, 2008 Share Posted March 24, 2008 sold for 360, anybody on here get it? I guess its back to fabbing my own intake manifold. Quote Link to comment Share on other sites More sharing options...
DatsunD Posted March 24, 2008 Share Posted March 24, 2008 I was so tempted but somethin told me there's not too much hp u can get out of just one SU carb. Any thoughts? Quote Link to comment Share on other sites More sharing options...
ww Posted March 24, 2008 Share Posted March 24, 2008 Agreed. I was expecting something along the lines of at least 2... Quote Link to comment Share on other sites More sharing options...
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