GTR w/oversize pistons

[josip]

Im buying a R32 GTR, Engine rebuilt w/oversize pistons, Garrett T28 turbos. HKS adjustable coilovers. Sparco 17X10 rims w/245 tyres. N1 Exhaust. HKS filters. Cross drilled rotors, CDplayer, GReddy Boost Gauge. NISMO 260km Dash. TurboTimer. Includes compliance & RWC.

How will the engine work with those pistons and is it a good upgrade?, How powerfull will my car be in rwkw & 1/4,mile ?

[GTR-Ben]

The oversized pistons shouldn't really make a difference. They are normally installed when the engine has to be bored due to being damaged, wouldn't call it an upgrade. I am guessing they are Stock oversized?

[siksII]

it will just make the compression ratio slightly higher... not a noticeable difference in performance...

if u knew how much oversize u can calculate the increase in compression..

[cameron]

If your really that keen to know, it might change the sound of the engine when its up on high rev's to compared to a stock GTR.

We have an RB25 with forged o/size pistons and aftermarket rods that sounds like the R34 GTR from 2 fast 2 furious. doesnt have that smooth purr of the stock RB25 anymore, this is with standard cams aswel.

Jun

[600hp]

it sounds like the pistons were not machined corectly causing piston slap. my 33gtr has JUN oversized pistons and it sounds completely stock!

[cameron]

it sounds like the pistons were not machined corectly causing piston slap. my 33gtr has JUN oversized pistons and it sounds completely stock!

What could be giving the different sound ?

Different manifolds

pistons (Arias)

Rods ?

Using stock crank!

Yeh sounds identical to the GTR from 2 Fast 2 Furious. - Listen to that and the to a stock GTST.

-------------------------------------------------------------

Pistons slap isn't good! You'll have to get your block re-sleved, to fit the pistons properly or get a new bottom end. But thats new ring lands, head gasket, seals etc. Pain in the assss!!

Just hope its not that and only somthing minor

[GTR-Ben]

Never heard it make any difference to the sound by going oversize?

How much oversize..?

[cameron]

.40 thou over

[josip]

Im ready to buy the car, im happy because its all rebuilt. How will my car go on 1/4 mile with all those parts that i listed on my 1st post. My friend says he will kill my car on 400m in his GTS-T on top speed with his mods(600hp turb0,...). and my cousins 180sx killed him on start, because his skyline is too laggy, his 180sx did best 13.9 on calder with cooler, full exhast system and 12psi. so they mixed my brain with their car talk. :bonk: . or they are jealous????

[GTR-Ben]

A R32 GTR with T28 turbo's can do 11's.. well as long as everything else is there to support them. Clutch and a FPR. Really need more fuel too. One of our previous GTR's runs constant high 11's with a near stock motor on T28's.

No way a GTS-T or 180sx would come close without a lot of mods..

[wrxhoon]

Im buying a R32 GTR, Engine rebuilt w/oversize pistons, Garrett T28 turbos. HKS adjustable coilovers. Sparco 17X10 rims w/245 tyres. N1 Exhaust. HKS filters. Cross drilled rotors, CDplayer, GReddy Boost Gauge. NISMO 260km Dash. TurboTimer. Includes compliance & RWC.

How will the engine work with those pistons and is it a good upgrade?, How powerfull will my car be in rwkw & 1/4,mile ?

what size pistons ? are they nissan ? you can get nissan +.5 mm oversize or +1mm but there are aftermarket pistons bigger still , it depends on what they used and how good the work was done .

if you have 87 mm pistons ( +1 mm oversize ) like i have in my car and they are the same compression as stock then you will find the compression will be a little higher than stock ( as long as they used a stock headgasket ) .

i have 87 mm arias pistons in mine that increases the engine capacity from 2568 cc to 2627 cc .

the extra 59 cc + slightly higher compression gives you a bit more power that is noticeable at low rpm ( no boost ) .

i dont know what turbos you have , what boost , computer , tune and a lot of other things must be considered .

i have the garrett n1 turbos in mine , power f/c , 1.2 bar boost ( ebc) and stock cooler , stock injectors ( on the limit ) , stock airbox , stock airflow meters ( on the limit ) .

the car has run 11.7 @ 121 mph 1.8 60 ft but the track was very slippery so i couldnt get a good 60 ft , have a look at my time slip on the registery .

i have an r33 so its a little heavier as well , that may give you an indication of what this car could run if the work is and tune are done well .

i have seen cars with more mods than mine like 2530's , 550 injectors , z32 airflow meters , camgears and he could only do 12.1 @111 mph with 1.7 60 ft .

[GTR-Ben]

yes wrxhoon, but we can't compare every car and it's mods as it comes down to so much. Tune/Driver etc.

I have seen a car with 2530's running low 10's on the stock bottom end.. just like I have seen cars with N1 turbo's and a PowerFC running mid 13's.

[wrxhoon]

as i said before it does come down to tune as well , as far as driver , track ... yea but the trap speed should indicate what the car is capable .

with trap speed of 121 mph , i should have a lower et than 11.7 but traction was the poblem as the slow 60 ft indicates .

yes wrxhoon, but we can't compare every car and it's mods as it comes down to so much. Tune/Driver etc.

I have seen a car with 2530's running low 10's on the stock bottom end.. just like I have seen cars with N1 turbo's and a PowerFC running mid 13's.