Squishyxout
New Member
Alright guys/gals, I've had this del sol for about a year now (1995 Si) so far, everything is stock beyond legitimate suspension upgrades and adjustable parts so I can actually have a proper alignment, because well, I'm not a huge fan of buying new tires all the damn time. I love the little thing, it's peppy, it is reliable as hell, it's different, but still a lego honda lol. I want a bit more power out of it and I don't want to go with boost. Boost complicates things, greatly reduces reliability, and as a wise man once told me "Keep it simple, stupid". I'm really only looking to achieve about 170-180 Hp. I'm not swapping in a motor, as that would entail just as much, if not more, work than boosting, not to mention the fact that Del Sols have weird shift linkages vs civics. This thread is going to be all about performance, I'll probably post a thread about the cosmetics at a later time.
First things first, It's a stock z6 with ~260k on it. I know that it's not Ideal, but before I buy parts, I'm going to have it tested with magical sonar beams to make sure there's no cracks or warping in the block or head. Assuming that it comes back all well and good, I'm going to start a high compression build using some of the following:
There are 2 possible piston choices I'm considering; PG6 Pistons or P29 pistons. I have questions about both setups.
Part/Compression change (static compression)
PG6 pistons in a z6 block 9.14->11.67:1 (so 11.67:1 is going to be our new control comp ratio for these pistons)
Stock Head Gasket to B7 .048" HG 11.67->11.33:1
Stock to Cometic .018" HG 11.67->12.32:1
P29 pistons in a z6 block 9.14->12.05:1 (12.05 is now our control here)
Stock HG to B7 HG 12.05->11.69:1
Stock HG to Y8 2-layer .025" HG 12.05->12.48:1
Okay so now the billion questions
First, I've heard before that the PG6 pistons limit your cam choice as the dome sits too close to the valves at TDC. If I run these pistons, is it safe to run a stage one Comp Cams camshaft?
If I were to go with the p29 pistons and go as High compression as I can (y8 .025) would I be fine if I had to settle for 91 octane gas somewhere in the boonies? Additionally, would the car still be streetable at 12.5:1? Same question on the Comp Cams Stage 1.
At what point do I have to upgrade my injectors? I already intend to upgrade to a 255 lph Walbro fuel pump (personal preference and I have extensive experience with this fuel pump), but injectors are quite pricey, so if I can use these I'd be pretty happy: http://www.ebay.com/itm/NEW-440cc-F...ash=item28238a556f:g:ozwAAOSw3KFWeL8Y&vxp=mtr
I know everyone is all gung-ho about Skunk2 products, but I'm still recovering from my GM days, and I've had great luck with Edelbrock, so that's my first choice on intake, I've also seen some OBX intakes with GIGANTIC plenums and straight runners, but they're for the obd2 d16's, can I adapt this easily? any opinions on performance??? And I am going to match the TB to the intake.
Exhaust isn't that important to me, I'm honestly going to buy an ebay 4-1 mani/downpipe with a test pipe (yay Iowa for no smog tests), and a 2.5" cat back, hopefully a twin-loop muffler (depends on the sound, I don't like fart cans or the lawn mower esque sounds they produce) Also considering a custom exhaust similar to a Pagani Zonda, only rotated 45° and out the bumper and not where the plate screws into the pretty panel.
http://media.fastestlaps.com/cj2at4z1llog/640x350m
The last real question I have about the High Comp setup is; do I have to have the head ported a lot to take advantage of 11.5-12.5 comp ratios? I intend on at least port matching and a polish, but anything more than that and I am going to have to send it to someone to be done (more money that I would prefer to not have to spend).
Any input, opinions, and advice is welcome, just please, rephrase your rude comments as informative criticisms.
Thanks,
~Squishy
First things first, It's a stock z6 with ~260k on it. I know that it's not Ideal, but before I buy parts, I'm going to have it tested with magical sonar beams to make sure there's no cracks or warping in the block or head. Assuming that it comes back all well and good, I'm going to start a high compression build using some of the following:
There are 2 possible piston choices I'm considering; PG6 Pistons or P29 pistons. I have questions about both setups.
Part/Compression change (static compression)
PG6 pistons in a z6 block 9.14->11.67:1 (so 11.67:1 is going to be our new control comp ratio for these pistons)
Stock Head Gasket to B7 .048" HG 11.67->11.33:1
Stock to Cometic .018" HG 11.67->12.32:1
P29 pistons in a z6 block 9.14->12.05:1 (12.05 is now our control here)
Stock HG to B7 HG 12.05->11.69:1
Stock HG to Y8 2-layer .025" HG 12.05->12.48:1
Okay so now the billion questions
First, I've heard before that the PG6 pistons limit your cam choice as the dome sits too close to the valves at TDC. If I run these pistons, is it safe to run a stage one Comp Cams camshaft?
If I were to go with the p29 pistons and go as High compression as I can (y8 .025) would I be fine if I had to settle for 91 octane gas somewhere in the boonies? Additionally, would the car still be streetable at 12.5:1? Same question on the Comp Cams Stage 1.
At what point do I have to upgrade my injectors? I already intend to upgrade to a 255 lph Walbro fuel pump (personal preference and I have extensive experience with this fuel pump), but injectors are quite pricey, so if I can use these I'd be pretty happy: http://www.ebay.com/itm/NEW-440cc-F...ash=item28238a556f:g:ozwAAOSw3KFWeL8Y&vxp=mtr
I know everyone is all gung-ho about Skunk2 products, but I'm still recovering from my GM days, and I've had great luck with Edelbrock, so that's my first choice on intake, I've also seen some OBX intakes with GIGANTIC plenums and straight runners, but they're for the obd2 d16's, can I adapt this easily? any opinions on performance??? And I am going to match the TB to the intake.
Exhaust isn't that important to me, I'm honestly going to buy an ebay 4-1 mani/downpipe with a test pipe (yay Iowa for no smog tests), and a 2.5" cat back, hopefully a twin-loop muffler (depends on the sound, I don't like fart cans or the lawn mower esque sounds they produce) Also considering a custom exhaust similar to a Pagani Zonda, only rotated 45° and out the bumper and not where the plate screws into the pretty panel.
http://media.fastestlaps.com/cj2at4z1llog/640x350m
The last real question I have about the High Comp setup is; do I have to have the head ported a lot to take advantage of 11.5-12.5 comp ratios? I intend on at least port matching and a polish, but anything more than that and I am going to have to send it to someone to be done (more money that I would prefer to not have to spend).
Any input, opinions, and advice is welcome, just please, rephrase your rude comments as informative criticisms.
Thanks,
~Squishy
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