84fb

Hey, I have a Weber 45 dcoe on a 13b in a 84 gsl-se. Just wondering how exactly I could go about turbocharging it (not familiar with how to make charge tubing and such with a turbo car, same as FI?). I searched and all the information seems to be for 12a cars or fuel injected 13b cars.

FB II

same as a weber style turbo setup on a 12a. hell get an RB exhaust spacer, TII turbo and manifold... bolt them up, make some oil lines, down pipe, and charge piping, get a hat for the carb and rejet the bastard. rock out!

perfect_circle

pretty much that easy, you need to do feul management as well, you stock pump would probably be okay, but you need a boost reference fuel pressure regulator.

brandizzle123

mallory 4309 does the trick, cheap to, like 79 shipped from summit

brandizzle123

can you CONFIRM that a "stock" weber can take the 5psi the s4 puts out without being "boost prepped"

FB II

lol, take the boost? sure. will you be able to tune it for that? i dunno and it won't be 5psi as i've stated millions of times. i can get 5psi out of mine..... but my wastegate is almost as big as the turbo exit itself.

84fb

So how many pounds can I run without spending money to boost prep the weber?

Searched some, so far I need:

manifold and turbo (going custom)
carb hat (cheap)
oil lines
charge pipes
intercooler (cheap)
various gauges


Any other parts? I'm sure I've forgotten a few basics

NoPis10

iTrader: (29)

look up Rotary Shack.
Robert is very informative and helpfull. he is a cool guy that has answered many questions I have had.
L8R

1badFB

iTrader: (1)

K, Now I always hear that the rotary just blasts exhaust into the turbo without porting the wastegate seriously, but would an external wastegate be a solution for this? If so how early would that thing open, and would it need to be plumbed back into the exhaust or could you just vent it off the manifold? Id love to roll up, turn down the boost and give someone a wastegate treatment lol. So all in all would an external wastegate solve the problem?

FB II

hmmm, sounds like you need some more research. a wastegate opens when you need it to. depends on the spring inside/ tension on that spring/ and if you have a boost controller or not. how big it is connected to whichever turbo will also depend on how well it does it's job. you can vent it to atmosphere... which i actually prefer. it sounds wicked! a bit loud tho, but that's all personal preference. if you plan to run an external wastegate on a stock TII turbo setup.... save some money and get a T4 turbo and matching manifold. all that work isn't worth it on a stock TII turbo. trust me. it's fun and all, but soon you WILL want to upgrade anyways.

rotariesrule

if you really want to know how do build a turbo car read huge mccinnes book "turbocharger" get it a a library.

1badFB

iTrader: (1)

Well I just meant. Could you keep it at low psi say under 5 with a (for example) 50mm external wastegate, without any boost spikes. providing I have a proper boost controller?

FB II

i can keep mine at 5psi thru al the gears w/ my massive exhaust and tubular header. you just need to port the stock wg out enough. no sense in buying all that **** for lack of elbow grease.

to answer the question... 50mm on the TII turbo will net you probably as low as 2psi if you wanted. 50mm is way too much for that turbo. not needed

BlastinSideways12A

I have a question about boosting as well. I am going to be installing a TII engine into my 85 and using Megasquirt (fuel only for now). Is there anywhere that I can read about running ignition on a turbo engine with a distributor? I will be using the stock S4 turbo and probably the stock intercooler or a front mount if i'm lucky. I plan on keeping boost to around 5 or 6 psi (ported wastegate with bigger flapper welded on). The questions about the dizzy that I have are whether to keep the mechanical advance and vacuum advance (will positive pressure mess things up?). Also, what timing should I be running?

Thank you

FB II

i've done both. locked and standard dizzy's.

either way honestly works pretty damn good. i'm running 14psi now with it unlocked... just get the TOTAL TIMING ADVANCE to 10 degrees and you can rock out with however much boost you desire.

Hyper4mance2k

iTrader: (40)

I've read on the Mazspeed forums that a weber will hold up to 8psi without being boost prepped. I've been searching and still can't figure out how you even boost prep a carb. All I know is that robert at rotaryshackdoes it, but doesn't tell you what he does. I think it's all a scam. Who has boost preped a weber and what needs to be done. I don't have the time to ship my carb off to someone. Also I don' believe in others working on my car... Another Q, With an unported waste gate what will my stock S5 turbo with a 3" exhaust stay at with a good boost controler? About 8-10?

hornbm

no scam, but if everybody knew how to do it robert would be broke LOL

Hyper4mance2k

iTrader: (40)

well yea I'm just messing on the scam part, but I don't see how people just send things off without know ing exactly what is done except "boost prepping" Robert is a good guy and all, but I'd rather do it my self.

brandizzle123

i am going to be turboing my 6Port 13b 48DCO without boost prepping the carb or locking the dizz the car is getting professionally tuned on a dyno shortly after its running i will be making custom piping to connect to the air horns vs. a carb hat (large o rings to get a good seal between the carb and the horns) ive got a fex questions about timing settings

BlastinSideways12A

What if I only want to run 8 psi on the S4 13bt block? Should I run a little more advance like 15 total?

What do you recommend as far as trailing split?

The vacuum advance is ok to utilize also, right? The car is a daily driver and I do quite a bit of highway cruising and 10-15 degrees of advance isn't great for fuel economy when cruising.

I saw your video of the drive to Walmart in your 79 and I really liked it. I almost want to turbo my 12a because of it but custom throttle bodies are expensive and I'm selling my Weber.

Thanks again for your help.