Draw through carb turbo setup

[Serban]

14 hours ago, Montezuma said:

Mine has not run since the 90s, it is project in wait at my friend's body shop.  I will be honest my starting point is a little better, the turbo is not locked up.  My car has a 3 piece Gnose on it and big fiberglass over fenders.  I have to go by my friend's shop and take some pictures of it.

You need to hurry up and get the car back on the road!  My turbo wasn't locked up, the car sat for a long time, but the guy did his best to protect the engine, hoses were capped off, carb inlet was covered. Totally sent me some pictures, I'd love to see another one of these setups and how they're run.

[Montezuma]

3 hours ago, Serban said:

You need to hurry up and get the car back on the road!  My turbo wasn't locked up, the car sat for a long time, but the guy did his best to protect the engine, hoses were capped off, carb inlet was covered. Totally sent me some pictures, I'd love to see another one of these setups and how they're run.

I will stop by and take some pictures of it; I figured it was not a one off kit and was curious of how many others sere out there and working.  I am sure they are not great runners based on the set-up but I have some guys here in San Diego that love the pull through systems, so of course they will be my point guys on getting this running.  I have $10k in body and paint to do on this car, then about another $10K on motor and maybe like $5K in the interior.  Not sure if this car finished is worth $30K, it is a 71.

 

[Serban]

Making some progress! This is the turbo kit on my L28. I'll be pulling this engine out, and putting the L24 that this kit came on in the car. This was for mockup.
20170724_220048 by Serban Gavrilescu, on Flickr

Wastegate added. I believe it's a 5psi spring, so that's a good start
20170724_220129 by Serban Gavrilescu, on Flickr

[Serban]

The L24 is in, and ready to go! I only get to work on the car a couple hours a night, so it took me about 3 nights from start to finish. Initially the L24 had low compression on a few cylinders (between 30-40psi). I put some Marvel Mystery oil in each cylinder, and after about 4 hours I tried again, and got about 150 across the board, seems promising! It starts and runs, and holds idle great! I have yet to drive it, I think there's a huge exhaust leak somewhere. I can't pin point it yet, but when you rev up the engine, exhaust smoke is coming from the manifold to turbo up pipe. So I'll probably have to pull it all apart and see how the welds are, or if there's a crack. But so far so good. Here's a few pictures from the swap!

20170726_171616 by Serban Gavrilescu, on Flickr

20170726_171623 by Serban Gavrilescu, on Flickr

20170726_171633 by Serban Gavrilescu, on Flickr

20170726_171645 by Serban Gavrilescu, on Flickr

20170726_171657 by Serban Gavrilescu, on Flickr

20170726_171713 by Serban Gavrilescu, on Flickr

20170726_171722 by Serban Gavrilescu, on Flickr

20170726_172011 by Serban Gavrilescu, on Flickr

20170726_215604 by Serban Gavrilescu, on Flickr

20170726_215818 by Serban Gavrilescu, on Flickr

20170727_005921 by Serban Gavrilescu, on Flickr

20170728_174955 by Serban Gavrilescu, on Flickr

20170729_220208 by Serban Gavrilescu, on Flickr

20170729_121122 by Serban Gavrilescu, on Flickr

20170729_220216 by Serban Gavrilescu, on Flickr

20170729_220434 by Serban Gavrilescu, on Flickr

 

 

[Serban]

You can hear the exhaust leak in the video.

Edited July 31, 2017 by Serban

[JSM]

Definitely think about adding a heat shield to the brake master cylinder. That turbine housing is very close.

I would also get some kind of portable or installed wideband to measure your A/F ratio. The money you would save rebuilding and time redoing far out weighs the cost of the wideband.


Sent from my iPhone using Classic Zcar Club mobile

[Serban]

I do plan on getting a heat shield fabbed up for the brake master cylinder. I do have a wideband and took it out for a ride last night. Just on wastegate pressure, it was quite possibly the worst turbo setup I've ever driven. 

The engine is smooth and afr was in the 11-12:1 range, but the turbo wouldn't start making boost until after 4k rpm, and it would hit 5psi right around 5500rpm, either something isn't right, or this old turbo is terribly inefficient. I'll pull things apart and make sure there's no boost leaks, and track down that noise that I swear is an exhaust leak, even though I don't feel it when putting my hand around all the exhaust flanges.

[ksechler]

I admire you for sticking with it.  What kind of boost are you expecting to see?

[Serban]

I expected spool up to be a little quicker. I started off with a 5psi spring in the wastegate and will put a boost controller to go up little by little, but keeping it at a safe level. Initially it didn't even feel like it was even making boost.

I took out an L28 with a mild cam, header, and triple webers. Wasn't the fastest thing on the planet, but I expected a turbo L24 to be a little quicker. I'll check everything over again before I totally give up on it. I'm too determined to give up!

[JSM]

2 hours ago, Serban said:

... , it was quite possibly the worst turbo setup I've ever driven. 

LOL.  That reminds of a ZX I drove that was built to the hilt.  There must have been at least $10,000 in add ons alone with all the things the engine had.  He said dyno numbers were in the 450HP level if I recall.

Step on the gas and it was horrid.... wait for it, wait for it... 3700 RPM and holy cow, hold on for dear life!  The funniest part was the welded diff.  Talk about awkward to drive.

[Serban]

43 minutes ago, JSM said:

Step on the gas and it was horrid.... wait for it, wait for it... 3700 RPM and holy cow, hold on for dear life!  The funniest part was the welded diff.  Talk about awkward to drive.

For me, it's not even that, even when the boost kicks in, it still doesn't feel like there's any, maybe if I stretch it to redline, something impressive might happen, but I only got a couple times to try it. Might just pull it all apart to check it before trying again.