Choice of pistons..

[2badrotties]

Has anyone ever heard of Probe industries ? They make a VERY nice piston for most engines. I bought 10 custom pistons... 13-1 comp., rings moved down, extra strength in wrist pin area, chrome moly wrist pins , and rings for all ten pistons. they were for a BIG and I can't say BIG enough nitrous motor ( 5.0 Ford ). Total cost $1018.00 They made them in a little over a week. They make the pistons that Ross put in a Ross box I'm pretty sure. They make A LOT of parts for a lot of people, who put them in their own boxes. They also make valve train parts, valves , and other things. Look them up and give them a call. You will save money cutting out the middle man.

 

[NDgsx]

Originally posted by RocketDSM
is referring to the fact that turbos do NOTHING for bottom end power and the bigger turbos don't spool until the very end of a normal RPM range.

So pick the right gear

On my old setup (550s, efi pms, 221 spearco, and TDO5H 20g 15degree clip) I got 20psi at 3,500. Above that boost threshold rpm boost hit very fast.

 

[RocketDSM]

To rdrkt: I would never be able to live with having to wait until 4K+ RPMs for boost. I hate waiting until the 3400 I have to now. Also, Crower my use the dimensions of the 4G64 crank (I don't know to be honest), but it's made of billet and massaged greatly. This makes it preferrable to the 4G64 stock crank IMO.

To NDGsx: In everyday driving, MPG is a thing to keep in mind. Gas is expensive (1.80/gal) here in Southern California. I can't drive around in 3rd just to keep the turbo spooled.

I understand that I have somewhat shot myself in the foot for my particular setup in that I haven't done the things that could really help my spoolup (DP for one). Hence why I don't complain about my setup. I'm just saying that if an engine can make (for example) 350HP WITHOUT a turbo, imagine what it can do WITH the turbo. Yes, at my compression levels and above it requires a better computer. A lot of people get better ECUs and don't run the high compressions, why? It would seem to me that you should max out all of your investments, especially an ECU considering the price. If I'm not using all of its functions, it's not efficient. So make the ECU compensate for higher compression pistons so you get the power safely.

 

[rdrkt]

You can only do so much with a 2.0L 4 cylinder motor regardless of compression. I have a power band the stretches from 4k to 8500. To me that is a pretty wide powerband. What Nick is trying to say is that you don’t need to stay in 3rd to keep the turbo spooled but you can downshift when you feel the need. But if you live in California and the best gas you can get is 91 octane you may as well just stop all your plans for high compression now because it just wont run right.

 

[RocketDSM]

Worst part about the gas is the nearest 76 with the really nice 100 octane is half a tank of gas away (argh). I've considered mixing race gas into my tank when I go to fill up, so that I don't have problems, but I'm not sure about it. When I transfer back to Japan (remember I'm in the Navy), I am thinking about taking my engine with me and mixing it with an older Evo. As for "downshifting when I feel the need" - why not just have the power there to begin with. Yes, 4cyl limits us a bit. I'm convinced that with proper gearing (custom not just gear selection), and a purposefully built engine, a streetable 4cyl turbo could smash most of the V8's out there. I already beat a lot of them in my area and my setup suks. If I can get the block built up nice, I know I can take just about anyone.

 

[UndergroundR32]

Originally posted by rdrkt
You can only do so much with a 2.0L 4 cylinder motor regardless of compression. I have a power band the stretches from 4k to 8500. To me that is a pretty wide powerband. What Nick is trying to say is that you don’t need to stay in 3rd to keep the turbo spooled but you can downshift when you feel the need. But if you live in California and the best gas you can get is 91 octane you may as well just stop all your plans for high compression now because it just wont run right.

He could dump a bottle of octane booster or two into his tank every fill-up? I'm surprised you can't get anything higher than 91 in California. Gas stations with 94 are so common around us. Also there are about 3 pumps within, I wanna say a 20 mile radius, that have up to 106 I think it is. That may be off since it's been a while since I've gone there. Fill your tank up with something that high on a regular basis and you can think about working nights also!

 

[Honda_killer]

on turbo cars its best to keep compression aroud 8:0 8:5

 

[JET]

I have Wiseco 8.8:1's in and absolutely love them. There is MUCH less slap that with JE's. The skirt design on the JE's are poor and that is the reason they slap. The slapping is bad enough for the car to register it as knock and cut your timing alot of the times. I am still running 19psi on 92 octane without a FMIC (waiting to go in). Search around and the you can find Wiseco's under $400 with rings.

 

[rdrkt]

Originally posted by UndergroundR32
He could dump a bottle of octane booster or two into his tank every fill-up? I'm surprised you can't get anything higher than 91 in California. Gas stations with 94 are so common around us. Also there are about 3 pumps within, I wanna say a 20 mile radius, that have up to 106 I think it is. That may be off since it's been a while since I've gone there. Fill your tank up with something that high on a regular basis and you can think about working nights also!

I could say a magical incantation while filling up with gas and that would have just about as much effect as a can of “octane boost” most of them are total junk. California and Arizona passed a law limiting the octane rating to 91. It has something to do with the environmental impact that higher octane has on the ground.

 

[UndergroundR32]

Originally posted by rdrkt

I could say a magical incantation while filling up with gas and that would have just about as much effect as a can of “octane boost” most of them are total junk. California and Arizona passed a law limiting the octane rating to 91. It has something to do with the environmental impact that higher octane has on the ground.

That was why I put a question mark after that sentence. I know basically nothing about them and was curious as to how much affect they had.

 

[boost]

Bottom end power? You have a 4 cylinder remember, if you want bottom end power buy a v8. And if anything a turbo does add to bottom end power big time compare 2 of the same motors, one turbo the other n/a, the turbo will make its peak torque at about 3000-3400 rpm with a street turbo, and the n/a will make peak torque at about 6000 rpms+.

 

[RocketDSM]

I'm not going to get into that argument in this thread. Turbos are not known as "low end" boosters. Simply put.

 

[gvr4#1375]

I have a set of Ross Pistons 8:5:1 ratio and Eagle rods I love them the car has had no problems at all I live in the East Coast it does get very cold up here...anyway.. I would recomend you the Ross, to me they are very good, I am running @23psi of course only when needed. Plus Ross are cheaper than JE, only if you buy them from Ross them self's. There website is http://www.rosspistons.com/ plus they have them in stock.
Well that will be it for now...

 

[sidoze]

there using a ethanol addative in the gas rather than MTBE, mtbe is whats making it 93-94 octane i believe.

not sure on the exact physics i just know that the thing replacing MTBE screws it up.

 

[Groomz]

I plan on running 21:1 compression and nitrous injection w/ propane also. If I mix diesel fuel and race gas w/ a pinch of high octane street gas I can get the best of every world. I think that by combining all the great things about every type of Otto cycle engine, I can blow my cylinder head into orbit.

You just got keyboard raced. Go in peace.

 

[streetraceboi]

what about hypereutectic pistons????

 

[Slappster]

Rocketdsm your driving the wrong car if you want low end. We build our cars around the turbo.

 

[NosLaser]

Streetraceboi,

Did you just hear the term 'hyperutectic' on the internet somewhere and figured you would use it to ressurect an old thread that that term has nothing to do with?? No turbo DSM has them, and no forged piston is hyperutectic either.

Regards,

 

[streetraceboi]

no i did not hear the term "hypereutectic" on the internet somewhere. a guy here in town was offering me some hypereutic pistons for $134 for all four and wanted to know if they were good. this is a thread about choice of pistons isnt it??? and i did not ressurect this thread, if you go up on the page you would see that a few others people have been responding to this thread.

 

[NosLaser]

The last post on this thread was in November of last year. You sir, posted in March of 2004. So who ressurected this thread again? And no, hyperutectic pistons are not any good for a turbocharged vehicle. I don't even think anyone makes them for our bore and stroke size, so you would have been buying pistons for another type of motor anyway.

Regards,

 

[streetraceboi]

the last thread was only like 4 or 5 months ago.........WOW!! and the pistons ARE for my specific car and year.

Regards,

 

[dls93tsi]

I went with venolia forged pistons, the price is steep but from what I hear, they are the best if he best

 

[dsmturboawd]

then get em streetraceboi.

have fun with them :laugh: .

 

[streetraceboi]

nah, im just going to save up and get ross or wiseco pistons. i dont want to take a chance with the hypereutectic. heard they werent good for turbocharged cars.

 

[1gE.T.]

Ross for me. I will let you know how it works out in 3 days.