02-27-2018, 10:29 PM | #659 |
Senior Member
Join Date: Aug 2013
Drives: BRZ
Location: Denver, CO
Posts: 845
Thanks: 677
Thanked 396 Times in 264 Posts
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
|
|
03-06-2018, 01:44 PM | #660 |
Member
Join Date: Sep 2014
Drives: '14 SSM BRZ Premium
Location: Central Iowa
Posts: 52
Thanks: 5
Thanked 19 Times in 13 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
They do make a boxer diesel. Although getting one from overseas is probably not easy.
Sent from my P008 using Tapatalk
__________________
"To be without silver is better than to be without honour." - Norse Proverb
|
The Following User Says Thank You to coryandy For This Useful Post: | fika84 (03-06-2018) |
03-06-2018, 01:58 PM | #661 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,806 Times in 3,300 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Granted the Civic was like bore n stroked n sleeved to 2.5L n had a motec system n valve work n e85 n everything, but doing 11.3 @124 and 330whp is good stuff. Could it be done with less money with FI? Yes but if someone wants to pony up the cash then it is their build, and I wouldn’t mind seeing it. |
|
03-07-2018, 02:10 AM | #662 | |
ft86club resident b-boy
Join Date: Oct 2009
Drives: Yamaha R3, moonslate 2018 GT Black
Location: LA Area So Cal
Posts: 1,214
Thanks: 142
Thanked 208 Times in 101 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Quote:
|
|
03-07-2018, 11:43 AM | #663 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,806 Times in 3,300 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
|
|
03-07-2018, 01:41 PM | #664 | |
ft86club resident b-boy
Join Date: Oct 2009
Drives: Yamaha R3, moonslate 2018 GT Black
Location: LA Area So Cal
Posts: 1,214
Thanks: 142
Thanked 208 Times in 101 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
Quote:
but back to celek's build. celek is already running an extremely high 13:1 ratio. 14:1 is not that high of a bump compared to 13:1, even though detonation risk is significantly higher. on top of that, you got the law of diminishing returns due to heat and friction. putting the civic aside, if celek raised comp from 13:1 to 14:1, do you really think that he would make anything more than minimal gains? for that much more detonation risk? |
|
03-07-2018, 06:58 PM | #665 | |
Senior Member
Join Date: Mar 2017
Drives: Q5 + BRZ + M796
Location: Santa Rosa, CA
Posts: 7,884
Thanks: 5,668
Thanked 5,806 Times in 3,300 Posts
Mentioned: 70 Post(s)
Tagged: 0 Thread(s)
|
Quote:
|
|
03-09-2018, 11:33 AM | #666 |
Junior Member
Join Date: Mar 2018
Drives: In the market for an 86 twin
Location: Houston
Posts: 8
Thanks: 0
Thanked 5 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
So first and foremost i do not have have an 86 twin, i have just been lurking this forum and trying to learn what i can about this platform as i consider an 86 for my next HPDE car.
Without getting too off topic, i do have years of tracking and recreational tuning experience and this seems like a fun topic to become involved in. With regards to compression, we're going to do some ricer math here. All else equal, 1 point of compression is going to give you about a 4% bump in power. Assuming this build will make 250 whp peak at 13:1, you could expect about 260 whp peak going 14:1. Now, keep in mind, that is a percentage gain, which means given the very linear power band of this engine i would expect curve gains to be minimal in the majority of the powerband? Yes, 3, 5, 7... over the whole curve is nothing to scoff at, but that "all else equal" is a very big caveat, and increasing compression brings in some other draw backs as others have mentioned. Now, onto the E85 issue. I have DI tuning experience and on my personal vehicle went down to as little as 2 gallons of E85 in a 16 gallon tank and still had impressive knock resistance. E85 in direct injection applications has an effective octane of about 160, which is why you see a lot of times DI cars are tuned on E85 blends. You do not need large amounts of E85, really anything over 25% (common referred to as E30 or E33) is unnecessary, so you may as well use as little as needed and keep the head room. At any rate, that is my .02 to this discussion, i'll go back to lurking. Last edited by Voltwings; 03-09-2018 at 11:52 AM. |
The Following 2 Users Say Thank You to Voltwings For This Useful Post: | DAEMANO (09-10-2019), Irace86.2.0 (03-09-2018) |
03-09-2018, 01:33 PM | #667 |
Senior Member
Join Date: Mar 2015
Drives: 2014 GT86
Location: Latvia, Riga
Posts: 4,333
Thanks: 696
Thanked 2,086 Times in 1,436 Posts
Mentioned: 53 Post(s)
Tagged: 1 Thread(s)
|
Octane number of 160 for E85? Wasn't it rather around 110?
|
03-09-2018, 02:34 PM | #668 |
Senior Member
Join Date: Mar 2014
Drives: '15 BRZ RA
Location: Greece
Posts: 3,787
Thanks: 2,417
Thanked 1,944 Times in 1,261 Posts
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
|
|
03-09-2018, 02:40 PM | #669 |
Senior Member
Join Date: Apr 2013
Drives: Raven Fr-S
Location: Santa Clara, CA
Posts: 136
Thanks: 100
Thanked 84 Times in 37 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
there are heat of vaporization benefits to E85, which would be more significant in a DI engine compared to PI, but i doubt they are as drastic as an effective octane number of 160
__________________
FR-S Mod target: 200 BHp / Tonne 4lb Li Battery, RPF1 17x9, 245 RE71R, RCE T2, OFH, OFT Stg 2, Berk Over+Front Pipe, , STI Eng/Trans Mts, PU Bushings, Forrester Liq-Liq oil cooler, Al Driveshaft, OSGiken Diff |
03-09-2018, 02:59 PM | #670 |
Junior Member
Join Date: Mar 2018
Drives: In the market for an 86 twin
Location: Houston
Posts: 8
Thanks: 0
Thanked 5 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
A computational model is used in
this paper to determine the knock resistance and effective octane number of these alcohol fuels when they are directly injected. The model indicates that the effective octane numbers are around 160 for ethanol and 180 for methanol. Taken from: https://energy.mit.edu/wp-content/up...-08-001-RP.pdf I started tuning in ... 2011, so it has been several years since i have read this article. |
03-09-2018, 04:13 PM | #671 |
Senior Member
Join Date: Jul 2016
Drives: Subaru BRZ
Location: Atlanta, GA
Posts: 846
Thanks: 885
Thanked 572 Times in 343 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
Last edited by Code Monkey; 03-09-2018 at 04:24 PM. |
03-09-2018, 04:36 PM | #672 |
Junior Member
Join Date: Mar 2018
Drives: In the market for an 86 twin
Location: Houston
Posts: 8
Thanks: 0
Thanked 5 Times in 3 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
|
The Following User Says Thank You to Voltwings For This Useful Post: | Code Monkey (03-09-2018) |
|
|
Tags |
2.3ltr, all motor, helpful, hks, hks stroker, informative, na brz |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Beginner STX Build Whiteout FRS Build Thread | Hachi86Roku | Tracking / Autocross / HPDE / Drifting | 21 | 03-31-2020 07:52 PM |
Ultimate coilover thread, What do you run on your car? got REVIEWS post it up! | THMotorsports.com | Suspension | Chassis | Brakes -- Sponsored by 949 Racing | 0 | 12-11-2013 05:25 PM |
The *ULTIMATE* Exhaust Thread by ECS Motorsports! | Over 2 Dozen Options! + FREE S&H! | AJ@ECSMotorsports | Engine, Exhaust, Bolt-Ons | 27 | 09-05-2013 09:14 AM |
*--->>ULTIMATE COILOVER THREAD<<---* The Best Deals + Free Shipping | FT-86 SpeedFactory | Brakes, Suspension, Chassis | 95 | 01-30-2013 07:48 PM |
Who's in for the long haul? | Laika | BRZ First-Gen (2012+) -- General Topics | 47 | 07-09-2012 09:48 AM |