im at like 8.75/1 comp right now with iron heads, would i have to change comp??? also how are the turbos cooled???? dont want any fires in the bilge

What year are the heads? are they fast burn?

I run 8.25 in my pontiac with Iron heads on 93 octane fuel, have Put 20PSI to it and it lives just fine.

I wouldnt hesitate to put 15 PSi to a 8.75 motor if it was tuned properly. The tune is the KEY

If you detonate the thing your gonna eat ring lands and head gaskets, If you can keep it tuned properly and run it a little on the fat side you'll have anice safe tune with big power thats reliable. I run Gen 7 DFI on my car with 160# injectors.

It could suuport almost 2000 HP. I havent pushed it very much yet.


You can easily make 1000 Hp each with turbos and just be scrtching the surface of its availble HP.

There are a few ways to cool the turbos.. first is to runa wet exhaustb and use a block off plate at the riser, Divert the water around the turbo and back into the back of the piping. This coupled with a coated exhaust housing will kill off allot of heat.

You can also make a stainless surround for around the turbine housing that is plumbed woth water to absorb and remove the heat. A guy i knew in mass did this and it worked really well.

Your always going to get some heat in the bilge though with turbos so I would vent it very well.

come on up and go for a ride in my turbo car. You'll be hooked instantly. I am only in simsbury so not very far away. In fact I was at outback in southington with the car last week,

Here thought you might like this one
http://www.youtube.com/watch?v=GK5XygHcsvk

heres another turbo power video

http://www.youtube.com/watch?v=lwF-k...eature=related

and a boat video
http://www.youtube.com/watch?v=3U9nYk3kcdg

Adam,

I'm surprised your compression is that low for a NA engine. 8.75:1 is excellent for FI, assuming you have forged pistons, you should be all set. I doubt you have blower pistons, so the ring lands probably aren't all that thick. I dont think I'd run it at 15 psi for sake of longevity, but I even at half that amount you'd be making some serious power... and on 93 octane to boot! I'd also add intercooling to Jeff's parts list. I run meth on my turbo cars. Great stuff, but I dont think I'd want to rely on it in a boat where the engines will stay on boost for extended periods of time.

While switching to fuel injection is the way to go, it will dramatically add to the cost. If you keep the boost down to reasonable levels, I'd say stay with carbs and see what you think before blowing a lot of time and money converting over to EFI.

Jeff and I have been talking about taking the cars and getting together some evening at the Pike. If you have a real interest in what turbos can do with big cubes, you should meet up with us... Jeff's car has a large single and mine has fairly large twins. I can pretty much guarantee you'll be hooked! :D

yeah when they built the motors the owner wanted superchargers but then changed his mind. thats why as is theyre only making a little over 500hp as 540 strokers. i think if i did something though it would be blowers. my buddy had a turbo RX7 all done up. that wankel was a little monster.

how bout some pics of girls we bring on the boat to get this thread goin......

Well the good news then is it likely has blower pistons in it already, so you dont need to worry about the ring lands and ring gaps as much.

Pound for pound, turbos will make more power than a blower will... but I understand that blowers can be cheaper and easier, not to mention proven. Still if I were starting with a clean sheet of paper, I'd go turbos.

I dont waste my time with Blower pistons if your tune is right the thickness of the ring land doesnt make much difference really.

If your tune is off your piston could be 3 inches thick and you'll kill the lands.

I have been building turbo engines for a long time now and In my own engines I dont waste my money.

15 PSi would be safe, with the proper tune I have run it at 9.2 in a Iron headed pontiac for 2 seasons but you will give up some timing to do it. You probably dont need 15 PSi anyway but it CAN be done.

DFI is great but you will loose some intercooling effect from the latent cooling effect of the fuel in the intake tract, that you would achieve with a carb.

You will however benefit from an almost infinately adjustable timing curve with DFi.

I have taught allot of people how to turbocharge there cars and make them live as well as built quite a few from the ground up.

Not subconrtacting peices to anyone else, but entirely building the system.

I started the forced induction forums at Pontiaczone.com in 2005 and have moderated it ever since.

Almost every car on that site runs my turbos, wastegates and Bovs and several run my custom stainless headers.

2MM thick, 3/8 flanges, gas purged and tig welded with V band and T6 flanges.

I dont turbocharge cars for the money I do it because I love it!

ok i pay for parts and jeff installs and sets it up.......then frank, kevin, and all the kronies want turbos cause ill be kicking their azz. so we both make out. :lolhit: