[OcLpRk8699]

Hey guys, i have an 01 is300 with a vvti 2jzge. I spoke to sound performance yesterday about a setup i want to pursue but i want your advice first. I'm looking for 600-700whp in the future, about a year or so but i want to build my engine now since it needs a rebuild anyways. It has 170k miles and i would like to replace the bearings, get any necessary machine work done, use gte forged rods and ge forged pistons. Other things i plan on replacing are the valves, valve springs, valve guides and seals. I was told the na vvti head flows plenty for the 600-700hp im looking to produce.

Now can i do this? SP told me that i might as well maintain my CR and make more power on lower boost. Since i want to rebuild my engine before im going to turbo it this makes sense to me, but my question is, if i get a set of used gte rods.. will they fit a set of new forged ge pistons?

 

[StarletGTT]

GTE rods will work with GE pistons. The non VVT-i GE rods found in SC300's 2jzge are the same found in the 2jzgte engine, thus why people only use a thicker headgasket on their GE's and make 800whp+ on the stock longblock GE.

 

[OcLpRk8699]

Okay. Do you see anything wrong with running the 9.5:1 CR on a future turbo build? Or adversely if i were to run gte pistons and rods and run a lower comp ratio with no turbo until i do finish the turbo setup what challenges will i face? Need a tune... etc.

 

[Seattle Express]

The problem with high compression on our motors is that you really can't take advantage of it unless you run race fuel or ethanol. If the car is going to see pump gas 95% of the time, then I would lower the compression to the 8.5:1 mark. With increased compression comes the problem of early detonation, so you have to lower the boost significantly if you're running pump only. You don't want to be driving around blocked at 380whp all the time, do you? On the other hand, if you have access to ethanol or race gas most of the time, then running those fuels overcomes knock and detonation allowing you to take full advantage of your high compression set-up.

 

[StarletGTT]

^^x2

 

[Ryeno]

ge pistons aren't forged.

 

[OcLpRk8699]

I understand completely. I do wish i could run a lower comp ration for now at least. how shitty would my engine run n/a with a 8.5 cr? Assuming i were to just go with gte pistons and rods. would i need some sort of special tuning?

"ge pistons aren't forged."

i understand that, my intention would have been aftermarket foreged ge pistons. My mentioning of the term ge pistons is simply to specify the higher 9.5:1 CR

 

[Ryeno]

You can't have it both ways, build an engine that's good for NA right now and good for turbo later. Even the non vvt-i 2jz-ge guys who go na-t run a tt headgasket for a cr close to 9.0:1.

 

[OcLpRk8699]

Well your right i can only have it one way, which is what my initial question was... I guess my main question is what would be the challenges of running a 8.5:1 cr NA? What can i use to tune it, and will it still run decent? Im assuming it will just a little on the laggy side. Ditto to the 9:1, if i ended up doing that, same setup? Tuning required? Wouldnt just running a thicker head gasket dramitically affect my quench distance..?

 

[lexforlife]

The problem with high compression on our motors is that you really can't take advantage of it unless you run race fuel or ethanol. If the car is going to see pump gas 95% of the time, then I would lower the compression to the 8.5:1 mark. With increased compression comes the problem of early detonation, so you have to lower the boost significantly if you're running pump only. You don't want to be driving around blocked at 380whp all the time, do you? On the other hand, if you have access to ethanol or race gas most of the time, then running those fuels overcomes knock and detonation allowing you to take full advantage of your high compression set-up.

are we talking in general or specific to running off stock ecu/piggyback ..i ask for from a standalone user like myself im at around 9:6:1 compression making almost 600 rwhp on pure 93 octane and making that at barely 19 psi and we saw zero knock thruout the pulls via aem logs on dyno.. in todays times theres no reason to be running compression less then 9:1:1 period.. compression is in direct relation to octane and back in the day most fuels readily avail was 87-91 octane hence the need for lower compression..you get much better throttle response , run less boost making abit more power(my prior tune with alpha using a boostlogic thick ass headgasket lowering me donw to around 8:4:1 had me at 561 at 23psi and today 592 at 19 psi)

ge pistons aren't forged.

neither are gte pistons

 

[OcLpRk8699]

thx lex thats exactly what i wanted to hear, and im really looking to duplicated those numbers. If you wouldnt mind do you think you could share a bit of your setup with me via pm? At least turbo size

 

[lexforlife]

thx lex thats exactly what i wanted to hear, and im really looking to duplicated those numbers. If you wouldnt mind do you think you could share a bit of your setup with me via pm? At least turbo size

no secrets here , its in my sig line .. pte 6776 dbb with .81 hotside

 

[Ryeno]

are we talking in general or specific to running off stock ecu/piggyback ..i ask for from a standalone user like myself im at around 9:6:1 compression making almost 600 rwhp on pure 93 octane and making that at barely 19 psi and we saw zero knock thruout the pulls via aem logs on dyno.. in todays times theres no reason to be running compression less then 9:1:1 period.. compression is in direct relation to octane and back in the day most fuels readily avail was 87-91 octane hence the need for lower compression..you get much better throttle response , run less boost making abit more power(my prior tune with alpha using a boostlogic thick ass headgasket lowering me donw to around 8:4:1 had me at 561 at 23psi and today 592 at 19 psi)

Don't forget that the combustion chamber is recessed on the ge so running a thicker HG to get 8.5 cr on a GE won't be the same as an actual GTE.

neither are gte pistons

i know

 

[OcLpRk8699]

Wouldnt just running a thicker head gasket dramitically affect my quench distance..?

Yea i said that about 3 threads up.

 

[lexforlife]

Don't forget that the combustion chamber is recessed on the ge so running a thicker HG to get 8.5 cr on a GE won't be the same as an actual GTE.


i know

i agree to some extent but my head has been milled 3 times already .. any differences would be small...

 

[BAD954BOI]

What is the weak/breaking point of the GE and GTE pistons reliably?
Because the combinations are endless but running gte pistons with gte hg would basically give you a gte response with a better flowing head since the GE has been tested to flow better to compensate for he gte's turbos.