Suggested pistons and rods for D Series turbo??
 

*HISTORY*
Spent a while chippin my ecu and setting up datalogging and rom burner and got everything to work. Burnt what was thought to be a baseline rom and started up my d15 vtec and started and ran what seemed to be stock. Sense my wideband didn't arrive yet i didn't make any modifciations to the rom. The rom i burnt was not the correct one, i think either timming was off or motor was runnin really lean/rich. After a few days of running the motor i noticed quick short hesitiations. Only lasted a split second ( think it was misfire not sure ). Took the car to redline a few times chasing around some co workers around afterwork and as soon as i came to a red light the motor wouldn't rev past 3k and was putting smoke everywhere and stalled. Started the motor back up and kept it revved till i could get it out the road, wouldn't go past 5mph. Pulled over let the car sit and cut the jumper on the ecu to put it back to stock. Cranked the motor and it started up SOUNDING LIKE SHI but started. Car runs somewhat like normal now but with a lot less power and intake sound has a deeper tone to it... One of these cylinders are blown to ----. Pulled the #1 spark plug and noticed oil on the plug, 2,3,4 where ok. I tihnk its the rings but not fully sure, gonna do compression test tommorow. drove the car home and started makin plans to rebuild the motor for the turbo i was planning on installing the next few weeks.

*Lookin For*
I got a d15 jdm vtec stock and instead of buying a replacment motor for cheap i think i should build a motor to handle the turbo i want to install. thinkin what you guys would suggest for building a sohc block to handle 10-15 psi.

So far i'm thinking of getting
low compression pistons
aftermarket rods
arp headstuds

You guys suggest anything for this setup or cheap places for parts?

Re: Suggested pistons and rods for D Series turbo??
 

i hear alot of d series people running suzuki vitara pistons for boost

Re: Suggested pistons and rods for D Series turbo??
 

you might look into getting an a6 or z6 block so you have more rod choices.

Re: Suggested pistons and rods for D Series turbo??
 

yeah, p08 d15 compatibility sucks monkey cock.

get yourself a d16 block first, then you can just snag a set of tunertoys rods and srp pistons or something like that.

Re: Suggested pistons and rods for D Series turbo??
 

i've been using p06 ecu from before i swapped the motor. Was told it would run with no problems. Could using the p06 instead of the p08 be the reason for motor issues instead of the rom?

Also looked for some pistons for this motor and saw this page listing the jdm motor as having

http://www.totaljdm.com/index.cfm/fu...dm_engines.htm

1590cc (SOHC VTEC)

Horsepower: 125hp@6600rpm
Torque: 106lbs-ft@5200rpm
Compression: 9.2:1
Bore: 75mm
Stroke: 90mm

isn't this the same bore and stroke of any d16 block? I would think i should be able to use the same rods and pistons for both.

Re: Suggested pistons and rods for D Series turbo??
 

that a 1.6l
wrong engine

Re: Suggested pistons and rods for D Series turbo??
 

listed as a d15b jdm spec though

Re: Suggested pistons and rods for D Series turbo??
 

I wasn't talking about ECU's when I said p08. I was talking about engine internals of the d15b.

bottom line, d16 internals will not fit your d15. The rods are different lengths.

Also, I've side by side compared a p08 (d15b) piston to a p28 (d16z6) piston. The wrist pin sits lower in the p28 and the overall piston height is taller as well. Result...using a p28 piston on a p08 rod will make your pistons stick outta the block.

Re: Suggested pistons and rods for D Series turbo??
 

i hear ya, just want to make sure everyeone is talking about the d15b jdm pistons and not the d15b7 non vtec pistons, but doesn't matter i just ran into another specs page that once again gave me diffrent specs for the jdm motor which goes with what everyone else is saying so i'm thinkin motor swap... yet again... ::)




Engine Code
Bore
Stroke
Deck Height
Rod Length
Displacement
C/R
R/S Ratio
HP/TQ



D15B7
75

84.5

207.45

134

1493

9.2

1.59

102/98





D15B (VTEC/JDM)

75

84.5

207.45

137

1493



1.62







D15Z1

75

84.5

207.45

137

1493

9.3

1.62

92/97





D16A6

75

90

212

137

1590

9:1

1.52

108/100





D16Y7

75

90

212

137
1590

9.4

1.52

106/103





D16Z6

75

90

212

137

1590

9.2:1

1.52

125/106





Did a compression test and i'm getting 195-185-190-200. These numbers good? Noticed the nasty sound i was hearing is comming from underneath the car and underhood sounds normal, went for a test drive and the motor feels and drives like normal, idles fine and the puny sohc power seems to be there. Poped the hood afterwards and noticed a light oil burning smell/smoke from behind the intake manifold, starting to think i somehow got tons of oil from the back of the block on the exahust making all the dam smoke i saw yesterday and somehow messed up the exausht, but this doesn't explain why the motor was in horrible limp mode and stalled the night before. I'm clueless here, don't even know what to look for.. Suggestions? ???

Re: Suggested pistons and rods for D Series turbo??
 

those compression numbers dont look bad.

Re: Suggested pistons and rods for D Series turbo??
 

didnt i see a thred here on hmt about somone useing ls rods in like a d16 because the stroke was so close, im not saying there stong, but alot better than d series and inexpencive, get some arp rod bolts and do the mod lol, unless u have some money or a d15, then just buy some cheap or used forged rods, and get some decent pistons like weisco or srp. -blake

Re: Suggested pistons and rods for D Series turbo??
 

yes, ls rods in d16 blocks has been done several times.

are they stronger? yes
are they as strong as a forged rod? no

Re: Suggested pistons and rods for D Series turbo??
 

PLEASE ONLY USE USDM ECUS FOR UBERDATA OR CROME. Blundar noticed quirks in how cars ran with JDM ECUs like the worthless P08, somehow the lack of certain circuitry and the code required to disable it throws off timing and AFRs. Sell that P08 to somebody who likes "JDM V-TECH Y0!!1" for as much as you can squeeze them for, because they deserve it.

Make sure the oil on that plug isn't because of a leaky valve cover... all that oil on a plug can short it out. Clean everything up really good, replace the plugs, and see how she runs.

Hesitation under acceleration can be a sign of very lean AFRs. Be very careful.

Re: Suggested pistons and rods for D Series turbo??
 

After inspection it looks like the valve cover needs some new seals, as for the hesitation i can't seem to duplicate it anymore, starting to think it was caused by something with the ecu, the motor runs normal now and appears to just have a oil leak near the oil filter. I have no idea how i can go from a smoked out car unable to stay running making horrible sounds to running with no problems only hours later with good compression.

Good heads up, gonna stick to the p06 just gonna have to understand the timmings before i burn the next rom, and the hesitation was under no load ( no acceleraion ) full throttle would barely keep the motor at 2.5k rpm and sounded like it was choking

Re: Suggested pistons and rods for D Series turbo??
 

LS rods fit? Are you serious? Huh, I'm going to look into that. What years/engines? Thanks Fook.


JP

Re: Suggested pistons and rods for D Series turbo??