im working on a build right now and i'll be putting on a turbo later(the hahn big 20g, i hope). i cant afford the turbo so i'm just going to go with crower rods and 8:1 je pistons, just to get it running. the Question is that can i drive the car with 8:1 com without a turbo.
what is better 9:6:1 or 8:1 for running the best boost and what could be the max on both of them.
thanks

The closer the CR is the more boost you can push. If you want to throw that turbo on your going to want the 8.8:1 pistons.

Weather you can run a turbo with those low CR pistons I'm not sure, I'm actually curious about that myself.

Rebuild In Process

DirtMegirt
Wiki Contributor

cool, what rods did you go with, the eagle rods. i want to get them but can they handle anything you throw at them. im trying to go with the crower rods but they are $$$.

I went with Eagle. I believe that the consensus on this board is that the Eagle rods will handle pretty much anything you throw at them. You may want to look into other options if you are planning REALLY HIGH horsepower.

DirtMegirt
Wiki Contributor

Eagle are enough, can handle around 400hp... just save the money with eagle and put that money in a good fuel management.

when i put the pistons in will they be ready to go? will i have to do something with the ecu to change the fuel and air cuz the different pistons

you will be fine. I'm running "8.6" comp JEs with Eagle rods on a stock fuel system and no special tune without any problems.

EDIT: and I am still non-turbo as well.

Chris
95 Talon Esi Turbo

I contributed to the Wiki!
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Don't know if it has been clearly said, but yes you can run with 8:8s.

I am right now. It sucks. Im broke.

Jason|1997 Eclipse RS

I contributed to the wiki!

happy p'ple

now i have another Q. how is the 8.6:1? i have been searching and just came up with what people are running. can i run a higher psi and is there a big difference form the 8.6 to the 8.8? does it take longer to spool? thanks guys

If you are refering to Howell's site about 8.6:1 pistons then ignore that. Howell's are 8.8 and just mistyped.

However generally speaking yes, the closer the ratio the more boost you can run safely. Thats just generally though because there a more factors involving higher boost.

Rebuild In Process

I was thinking of doing the same thing running the 8.8's until i can afford the turbo. I have another question though im going to be doing some top end engine work as well and i was thinking of going with http://www.howellautomotive.com/index.asp?PageAction=VIEWPROD&ProdID=397 does anyone know if my car will still run with this cam and 8.8's in it until i get a turbo for the car? and can it substain and dmg's if the turbo isnt on the car?

If you plan to go through Howell expected 3-6 months for your cams and horrible customer service.

With upgraded cams your going to have a rough idle. You'll need some sort of tuning software or someway of adjusting your timing.

-Ed

'95 Eclipse RS-T
'91 Laser RS (Sold)

if you go with howell just grab them by the balls. I told them I was going to contact the better business bureau and they sent the shit out next day and I got a free underdrive pulley.

:) Howell that bad huh? might check out modern preformance then

Too many people go low compression un-needingly. I would have gone with 9.6:1 JE's if I didn't have to wait 4-6 months to get special ordered, so I went with the off the shelf 8.8:1's. "Basically" the only downside of the higher compression is that you have to be more careful tuning. Sure your boost will be less, but you'll be making more power under the curve.

For pretty much any kind of driving/racing except drag *only*...
high compression + low boost > low compression + high boost

If you drive this car every day you will enjoy it better with decent compression.

A good example the older Hennessy Viper's put out 800 hp at 8 PSI of boost. The new Hennessy Viper Venoms put out 1200 hp at 15 PSI of boost.

This is why I hate when people ask how much boost you run, and don't even care about what kind of motor you're boosting.

Joel Baldridge, ASE Certified Master Technician, Audi Certified Expert Technician

pm sent

same mes
"i have a Q, when putting the rod bearings on do i put lube on both sids of the bearings? or just on the side that touch's the crankshaft"