New Project: Grassroots Motorsports $2010 Challenge Car Options

[camaroz1985]

Just thought I would post up a quick picture of my newest project.

(IMG:http://i254.photobucket.com/albums/hh87/camaroz1985/914/PIC-0088.jpg)

Its a '75 that I will be building for the $2009 Challenge. There is no engine now, and I am still trying to figure out what I will be using.

I think about 200hp should be good enough if I can keep the weight down. I figure I have about $750 for engine and cooling system (or preferably a parts car that I can get everything from).

What do you guys think? What are my best options? Who has cheap parts they want to sell to help the cause (IMG:style_emoticons/default/biggrin.gif)

I'll update this as I progress.

[camaroz1985]

I already have budgeted the $550 for the Kennedy adapters, and that is not included in the $750 i listed.

What kind of power can you get out of a turbo type IV, and how much will it cost me to get it. If i went that way I would have $1300 to spend, but would prefer to put more into suspension stuff. So what could I get out of one (plus the purchase of the motor) for $1000.

[ottox914]

I already have budgeted the $550 for the Kennedy adapters, and that is not included in the $750 i listed.

What kind of power can you get out of a turbo type IV, and how much will it cost me to get it. If i went that way I would have $1300 to spend, but would prefer to put more into suspension stuff. So what could I get out of one (plus the purchase of the motor) for $1000.

How long do you want/need it to last?

You'll need to hack/bend up some sort of exhaust and flange to mount the turbo. For a rat rod git-r-done type of deal, I'd move the battery to the trunk, and mount the turbo up in that area. The stock EFI will laugh at you then run lean and hole a piston, no way it can deal with positive manifold pressure. Doing this on the cheep, I'd do a draw thru carb set up. Its very old school, but should keep you under $2009. If the event is run in warmer temps, that will help you out, as the draw thru systems don't work well in colder temps. Since you can't use an intercooler with a draw thru system, I'd rig up a cheep water injection system to keep the charge temps down. The T-IV pistons have the rings mounted way up high on the piston, which will expose them to alot of the pressure of the boost when things heat up in the cyl, so keeping things cool will go along way toward keeping the motor together and the ring lands from cracking.

How much boost?

How long do you want/need it to last.

I've read on Jake's forums of guys running up to 20psi on stock internals, but the pistons don't last. And they have a ton of motor cooling and intercooling. And $$$ in the project. If you want it to last for exactly 1 weekend, and you're willing to take a 50/50 bet if it'll even last that long, go for 20 psi and let us know how far the pieces go when it scatters. Longer term use, shoot for 10psi, and if you want to push your luck, go for 15. If they run the autox before the drags, maybe run 15 for the cones, and bump to 20 and some NOS for the drag...

How much power will that all be? No clue. Never got mine to a dyno last year.

How much cost?

What are your options for the exhaust system? Can you scare up some tubing, cut and weld on your own, or do you need to farm this out? Lets say 100 in materials for tubing/flange material. 50-200 for a used turbo. Look for a small one, like the front or back turbo off a mitzu 3000gt, a 9B turbo. Another couple hundred for a side draft carb of some sort. If you're using the stock 914 fuel pump, a regulator to dial down the fuel pressure. $500 bucks and alot of imagination might do it, with some sharp shopping and lots of free labor.

With my built motor I'm looking to make 15psi, but also to make it for a good long time. I have no interest in dropping the motor every winter to re-re-re build it again. I'm building the long block around the idea of making the most airflow I can at low rpms so I can spool the turbo quicker, and let the turbo make the power beyond that. More interested in torque than HP. I'm running a 3000gt turbo, and on a stock 2.0 motor, boost started by 2500, was all in by 3500 or so, and pulled hard to the 10psi boost cut. If I make 200/200 at the wheels, I'd be pretty happy, but I'll build it and see what I end up with, and whatever that is, it'll be better than what it is now. I'd love to see 10psi by 2500, and 15 by 3500.

All this is very contrary to what I'm doing with my turbo car- stand alone ecu, ITB's, and now a boost friendly Raby motor, but for a fast ride on warm days for $2009 or less, I'd google up and research a draw thru set up, and spend more $$ on suspension and tires than motor.

If you're going turbo T-IV.

***edit: turbo T-IV forum: http://forums.aircooledtechnology.com/forumdisplay.php?f=34

***edit: draw thru turbo on a buggy: http://www.smbaker.com/rail/monsterturbovw.html