mdnt08

My '83 is a manual rack so I do not know if it will line up to the stock PS pulley. You can always look into what it will take to shift the PS pump if it does not line up.

mdnt08

Just an update, on the grid while waiting to run on the past events...the IC heat soaks with MAT rise from 35c to 61c! It does not cool down in the runs either...just not enough time moving. I'm in the middle of installing a on-demand low pressure Water Injection pre SC and another on-boost only high pressure post IC injection with 50/50 water/meth. The low pressure is a DIY with Mcmaster car nozzles, the high pressure is a Snow Performance. Initially I will use the hobbs switch to ON the pump and solenoid (ebay) with just pure water to witness the temp drop. In the end I hope I can tune a second VE table and IGN table to kick in when the standalone sees the high-pressure pump running. The 50/50 tank will have a low sensor to trip the fail-safe so I don't run the leaner tables on empty....I hope. Plan to pick up the rest of the fittings I need today and try it with pure water.

Tiger03447

You could also spray water on the intercooler to bring the temps down. that way you can control the temp without affecting the mixture...jus sayin..thanks.

mdnt08

Given the higher CR and the event runs being so short 35-50 secs per run. I need the air charge to be cooler immediately along with the knock suppression. In testing today I watched the MAT go from 45c to 27c in one quick 2nd gear 2-4500rpm. I came to complete stop at a light and noticed the MAT remained at 29-31 for sometime. The 50/50 makes a huge difference in comparing 100% water too.

I <3 enginerding

Thats basically the same MAT I get with my NA. What psi do you run?

V2Rocket

27C is a GREAT IAT number....must be working

I thought you should avoid running water pre-IC to avoid condensation/pooling issues?
If you look at current OEM Ford turbo stuff their IC's actually have a drain plug for pooled condensate just pulled from the charge air.

mdnt08

Yea seeing the temp drop to 27c that quick made me happy. The pre sc actually doesn't seem to help at all. I tested it separately with the car heat soaked, not a change in temp at all....shot variations of amounts too....maybe it did pool idk.

mdnt08

7-9psi

jderimig

Winter is coming and its time to get back to my SC project. Ordering a VEMs pnp from Peep shortly.

My goal is to find a way to keep the AC. If there is room (and there might be with my MB M62), what is the downside of fabbing a double pulley on the alternator and sistering a belt drive to the SC? I am thinking that would be too much load on the pulley and the belt would slip?

V2Rocket

pulleys need maximum belt wrap which can be provided by really tight idlers or a larger pulley.
more ribs is even better but you're limited by the stock accessories to a 5 or 6 rib belt depending on MY of your car.

since the beginning my project has been designed around keeping the AC but TBH it would be WAY easier to do this without AC installed.

jderimig

Of course.. Gates has a pretty comprehensive belt design guide. Since my project is going for only low levels of boost I was hoping that my drive requirements are modest. Issue is that alternators typically have small pulleys (2") which do not have a lot of drive potential. If I put a 3" pulley there to give more drive capacity will the lower rpm of the alt be an issue I wonder?

V2Rocket

yes, 3" for example is a huge difference in RPM (50% slower), it'd be ok moving but you'd really struggle with lights/fans/etc while idling at a stoplight.

on mine the only way i figured to make AC stay was to put the alternator on the other side, where the PS pump used to go.
however, 15 years ago Huntley Racing hung their SC from their intake manifold which cleared the stock 944 alternator/AC setup, so it is doable.
i think if you could really get creative designing an SC mount bracket you could hang it off the side of the engine, above the stock AC/alt, it's just you start to get limited in room for plumbing to/from the SC as space is limited on that side by the fender and brake cylinder.

see my work-in-progress (this picture is from 2011, lol) :

jderimig

33% slower, maybe I can set idle at 1000 instead of 800 and get 25% of that back....

I want to keep PS also.... :-)

V2Rocket

nowadays there are lots of options for electric PS pumps, or electric-assisted racks....something to consider.

there are even electric AC compressors but those tend to need much higher power capacity (48V or LOTS of amps) to run.

mdnt08

[QUOTE=jderimig;15382814]3" might be too big with the relatively low output oem Bosch.
Also having the engine running well and solid with VEMs prior to adding boost reduces a ton of risk.
In reading some MB230 specs, the crank pulley might be 6.1" Isn't the 2.58v's crank a 5"? Do the math, I don't think the existing pulley will drive it hard enough.