New Hotside being installed

Nice pics! A guy I work with has a DeLorean - a friend of his took some "light painting" shots of it - where you sit on a series of long exposures, "painting" the car with light. Give it a shot (no pun intended). When you combine the shots and paint out the guy with the light, you end up with this:

BRINGING MY THREAD BACK UP FROM THE DEAD BECAUSE IT'S GOING BACK ON THE DYNO NEXT WEEK MARCH 16TH 2023:

Nothing real major in changes but we will be pushing it a lot harder.

The main reason that it's going back is because I removed the Meth Injection. The meth pump went bad last Fall and I didn't want to keep spending $200 to replace something that isn't needed on this car since it runs on E85.

I also learned something about Fuel Pumps! I had to put new fuel pumps in it b/c I discovered that a lot of fuel pumps are internally regulated at 63psi of fuel pressure no matter how much is commanded. When I looked at the log files sure enough I was commanding 75psi and only getting 63psi. I now have three 450lph Hellcat pumps which can go to over 100psi of fuel pressure so I should be good.

So no more meth injection and I have found more info about the strength of these Iron Cobra blocks. Rumors had them breaking at 500-700hp which is true but investigating this more always showed other factors (mostly lack of proper fueling) that failed first causing a lot of broken parts. I have found one Gent running a Factory Iron short block complete with factory rods, rod bolts, main bolts, etc that dyno'd over 1400RWP on a Turbo/Auto combo and ran 7's @180mph for three years and I found others that are running low 8's @ 165mph...all good news for those of us that have the Cobra Iron Blocks. Reading how strong the blocks can be I'm not worried to push it harder.

I also installed pressure sensors: One to measure pressure before the turbo and one to measure the pressure before the IC. My turbos are small at 61mm but they are designed to be pushed really hard so that's what I'm going to do.

I plan to try and hit 1000+HP though the exhaust and run up to around 45psi of boost if the turbos will pass that much. None of these numbers are a "must have". I will simply play it by ear and if it doesn't get there no big deal but if it does, Great! It's already making 900 and all it needs is another 100 but it's going to be close..

I also have GoPros that I plan to use to film it so maybe things will go well and I will have a good vid of the pulls.

KS

Another Update 3/23/23..

The previous tune on E85 still had the meth injection installed and since the meth pump quit working I decided to remove it completely which required a new tune.

I have recently discovered that this Cobra Iron block is a lot stouter than initially thought. Instead of the 700hp limit back in 2007-ish, people have been pushing this block will into the 1xxxhp range with one gent running the FACTORY Cobra short block (bolts, pistons, rings, etc) and running 7.4's @ 180mph with turbo/auto combo. So seeing how stout this block is I decided to push these turbos farther to see where where their limit was.

2V, twin 60mm, E85, 4R70, Full Length exhaust with 3 mufflers, 39psi boost,= 950hp and a blown head gasket..
Previous best dyno run made [email protected]

Pressure sensors pre/post IC shows that the IC is only losing 1.3psi.
Pressure sensor on exhaust pre-turbo is at a 1.9:1 pressure ratio so there is a limit here.

Tune looked smooth and perfect and nothing can be seen in the log files that may have caused it to go so it may just be too much cylinder pressure as this motor is probably making around 1200-1300hp..

I have it it all on video and log files so when I get a chance I will put something together.

I will simply put new gaskets in it and repair/update a few things then call it good.

ks

Killer95GT302 said:

It looks like you're getting diminishing returns on increasing the boost to go up 7lbs and only pick up 48 hp?

Also backpressure seems like alot, 2:1 seems acceptable on lower boost levels like 20lbs, but pushing 40lbs of boost, thats nearly 80lbs of backpressure!

Either way nice numbers, better a head gasket than anything else!

Click to expand...

Being a "street" combo things are working out really well and those that helped build the selection of parts said things are falling into what they expected. I'm surprised it wasn't above 2:1 at the earlier 30psi with these 60mm turbos so to make 39psi with this exhaust setup and only be just below 2:1 surprised me. Obviously this would not be a good combo for a full race setup but for a powerful street combo this thing makes a lot of power/torque... Full length exhaust, three mufflers so it's quiet, easy street manners, low stall converter, flex fuel.. I really like it, it's perfect for what I want.

I got the log file from the tuner and I gave it a quick look and it made about 950hp before he shut it down at 6100rpm. We decided a 6200rpm limit for the initial runs but he said he let off early but at that same moment is when he saw that a radiator hose let go... which was caused by the head gasket letting go. I actually haven't seen the dyno graph but I will get it when I stop by the shop sometime..

I plan to tear into it tomorrow, but not sure how far I will get...

I'm starting to research head gasket sealing so I expect to learn a lot. I like where it's at right now so I just want to get it to seal as-is, not make more power..

ks